CN116323516B - Ecological easy-to-pump high-filling ultra-high-performance concrete and preparation method thereof - Google Patents
Ecological easy-to-pump high-filling ultra-high-performance concrete and preparation method thereof Download PDFInfo
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 80
- 238000011049 filling Methods 0.000 title claims abstract description 46
- 238000002360 preparation method Methods 0.000 title abstract description 19
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 123
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 99
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 88
- 239000004576 sand Substances 0.000 claims abstract description 78
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 73
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 61
- 239000010959 steel Substances 0.000 claims abstract description 61
- 239000000463 material Substances 0.000 claims abstract description 57
- 239000000843 powder Substances 0.000 claims abstract description 55
- 229910052875 vesuvianite Inorganic materials 0.000 claims abstract description 55
- 239000000835 fiber Substances 0.000 claims abstract description 41
- 239000004575 stone Substances 0.000 claims abstract description 37
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000010881 fly ash Substances 0.000 claims abstract description 32
- 239000006004 Quartz sand Substances 0.000 claims abstract description 31
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 30
- 239000011325 microbead Substances 0.000 claims abstract description 23
- 239000004568 cement Substances 0.000 claims abstract description 20
- 239000013530 defoamer Substances 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 239000000654 additive Substances 0.000 claims abstract description 9
- 230000000996 additive effect Effects 0.000 claims abstract description 9
- 238000003756 stirring Methods 0.000 claims description 50
- 238000000034 method Methods 0.000 claims description 22
- 239000007788 liquid Substances 0.000 claims description 21
- 238000002156 mixing Methods 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 20
- 239000002518 antifoaming agent Substances 0.000 claims description 13
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical group [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 10
- 239000000292 calcium oxide Substances 0.000 claims description 10
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- 239000011148 porous material Substances 0.000 claims description 10
- 230000002745 absorbent Effects 0.000 claims description 9
- 239000002250 absorbent Substances 0.000 claims description 9
- 239000011268 mixed slurry Substances 0.000 claims description 9
- 239000011347 resin Substances 0.000 claims description 9
- 229920005989 resin Polymers 0.000 claims description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 8
- 230000002378 acidificating effect Effects 0.000 claims description 8
- 229920002125 Sokalan® Polymers 0.000 claims description 7
- 239000004584 polyacrylic acid Substances 0.000 claims description 7
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 6
- 229920000570 polyether Polymers 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 238000001291 vacuum drying Methods 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 4
- 238000004806 packaging method and process Methods 0.000 claims description 4
- 229920005646 polycarboxylate Polymers 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 239000003469 silicate cement Substances 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 2
- 239000004567 concrete Substances 0.000 abstract description 30
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 8
- 239000011707 mineral Substances 0.000 abstract description 8
- 230000006872 improvement Effects 0.000 abstract description 2
- 238000005728 strengthening Methods 0.000 abstract description 2
- 239000002002 slurry Substances 0.000 description 24
- 230000000052 comparative effect Effects 0.000 description 19
- 239000011398 Portland cement Substances 0.000 description 14
- 230000000694 effects Effects 0.000 description 14
- 239000011159 matrix material Substances 0.000 description 9
- 238000012360 testing method Methods 0.000 description 9
- 239000000203 mixture Substances 0.000 description 8
- 239000004033 plastic Substances 0.000 description 8
- 229920003023 plastic Polymers 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 238000005086 pumping Methods 0.000 description 8
- 239000000853 adhesive Substances 0.000 description 7
- 230000001070 adhesive effect Effects 0.000 description 7
- 238000007580 dry-mixing Methods 0.000 description 7
- 239000013078 crystal Substances 0.000 description 6
- 238000011161 development Methods 0.000 description 6
- 239000011435 rock Substances 0.000 description 6
- 230000007704 transition Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 5
- 239000000920 calcium hydroxide Substances 0.000 description 5
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- 241000276425 Xiphophorus maculatus Species 0.000 description 4
- 239000004566 building material Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 150000003376 silicon Chemical class 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 238000006703 hydration reaction Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000005543 nano-size silicon particle Substances 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- 235000012239 silicon dioxide Nutrition 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000036314 physical performance Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 229910001653 ettringite Inorganic materials 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 238000007306 functionalization reaction Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000011863 silicon-based powder Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000004034 viscosity adjusting agent Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to ecological easy-to-pump high-filling ultra-high performance concrete and a preparation method thereof, wherein the ecological easy-to-pump high-filling ultra-high performance concrete comprises the following raw materials in parts by mass: 700-1300 parts of cementing material, 800-1400 parts of aggregate, 50-200 parts of steel fiber, 50-150 parts of additive and 160-220 parts of water; wherein, according to the mass portion, the cementing material includes: 550 to 1000 parts of cement, 50 to 180 parts of fly ash microbeads, 50 to 250 parts of silica fume and 30 to 150 parts of stone powder; the aggregate comprises: 300-1300 parts of quartz sand and 50-1000 parts of vesuvianite sand; the additive comprises: 8-30 parts of water reducer, 3-15 parts of defoamer, 20-80 parts of expanding agent, 10-50 parts of shrinkage reducing agent, 2-10 parts of internal curing agent and 10-50 parts of silica sol. The ultra-high performance concrete prepared by the application realizes the comprehensive improvement of pumpability, filling performance and continuous expansion rate on the basis of further strengthening the mechanical property and durability of the concrete, and simultaneously realizes the high-value utilization of natural minerals.
Description
Technical Field
The application relates to the technical field of building materials, in particular to ecological easy-to-pump high-filling ultra-high-performance concrete and a preparation method thereof.
Background
The combined structure of steel pipe-concrete and steel shell-concrete combination section has become an ideal structural material in modern bridge design and construction due to the full utilization of the synergistic stress effect of two different types of materials, namely steel and concrete. In order to further improve the bearing capacity and long-term service performance of the steel pipe/steel shell-concrete combined structure, the novel steel pipe/steel shell-ultra-high performance concrete combined structure is designed and used, and the novel steel pipe/steel shell-ultra-high performance concrete combined structure has a wide application prospect.
The ultra-high performance concrete has extremely low water-cement ratio, high viscosity, obvious internal self-drying phenomenon and rapid early shrinkage development, so that in the process of pumping, filling and pouring the steel tube/steel shell by using the ultra-high performance concrete, a series of technical problems are faced:
1) The viscosity of the ultra-high performance concrete slurry is high, and the pumping performance of the ultra-high performance concrete slurry is easy to be reduced, so that the difficulty and the risk of high-altitude pumping operation are increased;
2) The viscosity of the ultra-high performance concrete slurry is high, and the trafficability of the ultra-high performance concrete slurry between rib plates/reinforcing steel bars is reduced, so that the incomplete filling of steel pipes/steel shells is easily caused, and structural defects are formed;
3) The ultra-high performance concrete slurry has high viscosity, a pseudo-coagulation layer is easy to form on the surface, the overflow time of internal bubbles is prolonged, and the bubbles which delay the escape are easy to enrich at the interface of the steel pipe/steel shell-ultra-high performance concrete, so that the interface cohesive force is reduced, and even void is caused;
4) The ultra-high performance concrete has large shrinkage, and the concrete and the steel pipe/steel shell are easy to debond under the action of strong shrinkage stress, so that the long-term service performance of the combined structure is greatly degraded.
Therefore, a reasonable plastic viscosity interval and an effective regulation and control method of the ultra-high performance concrete slurry are needed to be found, so that the ultra-high performance concrete slurry has good pumping performance and passing performance and simultaneously realizes low gas-high strength-high homogenization.
The realization of micro expansion of the ultra-high performance concrete is a key point for solving shrinkage deformation of the ultra-high performance concrete. Currently, the combination of an internal curing agent/expansion source and an expansion agent is the best design strategy for preparing an expansion concrete. However, this method is often difficult to achieve in ultra-high performance concrete systems, the root cause of which is that the ultra-high performance concrete is extremely water-deficient inside, and the expansion reaction of the expansion source is difficult to be sufficiently excited. In the aspect of internal maintenance, although the water supply efficiency of the common super absorbent resin is high, the defects of the common super absorbent resin are obvious: the material is easy to float upwards, and the vibration/pumping process is easy to crack, and the water loss shrinkage is introduced into the holes; the strength and water absorption rate of the lightweight aggregate are too low, and the water supply is insufficient for the full reaction of the expansion source. In the aspect of expansion sources, the formation of common ettringite expansion sources requires sufficient moisture, which has poor adaptability to ultra-high performance concrete systems; the magnesium hydroxide crystal expansion source has small expansion amount and is mainly applied to the later stage, so that the characteristics of large early shrinkage of the ultra-high performance concrete are difficult to match. In the aspect of internal curing/expansion source combination, direct combination or simple load can cause mismatching of internal curing water supply and expansion agent water requirement on a time action window, so that expansion efficiency is greatly consumed before a matrix is hardened, compensation shrinkage contribution in a critical period of shrinkage after hardening is greatly weakened, and continuous expansion is difficult to realize.
In addition, the natural mineral materials are fully utilized to realize the functional and high-value design and application of the natural mineral materials in the field of large-scale building materials, and the significance is great.
Based on the viscosity modification of the natural mineral materials to the ultra-high performance concrete gel system, the ecological type easily-pumped ultra-high performance concrete with high filling property and the preparation method thereof are developed, and the ecological type easily-pumped ultra-high performance concrete has important technical innovation and practical value.
Disclosure of Invention
The embodiment of the application provides ecological easy-to-pump high-filling ultra-high performance concrete and a preparation method thereof, which are used for solving the problems of low pumpability, filling property and continuous expansion rate of the ultra-high performance concrete in the related technology.
The technical scheme provided by the application is as follows:
in a first aspect, the application provides ecological easy-to-pump high-filling ultra-high-performance concrete, which comprises the following raw materials in parts by mass:
700-1300 parts of cementing material, 800-1400 parts of aggregate, 50-200 parts of steel fiber, 50-150 parts of additive and 160-220 parts of water;
wherein, according to the mass portion, the cementing material includes: 550 to 1000 parts of cement, 50 to 180 parts of fly ash microbeads, 50 to 250 parts of silica fume and 30 to 150 parts of stone powder;
the aggregate comprises: 300-1300 parts of quartz sand and 50-1000 parts of vesuvianite sand;
the additive comprises: 8-30 parts of water reducer, 3-15 parts of defoamer, 20-80 parts of expanding agent, 10-50 parts of shrinkage reducing agent, 2-10 parts of internal curing agent and 10-50 parts of silica sol.
In some embodiments, the particle size of the vesuvianite sand is less than or equal to 3mm, the porosity of the vesuvianite sand is 10% -35%, the pore size of the vesuvianite sand is 5-60 μm, and the powder content of the vesuvianite sand is less than or equal to 3%.
In some embodiments, the fly ash microbeads have an average particle size of 6-18 μm, and the vitreous content is greater than or equal to 90%;
And/or the average grain diameter of the silica fume is 0.1-1 mu m, and the content of the silica is more than or equal to 90%;
And/or the average grain diameter of the stone powder is 10-30 mu m, and the content of calcium carbonate is more than or equal to 92%.
In some embodiments, the water reducer is a polycarboxylate water reducer;
And/or, the defoamer is polyether modified silicon defoamer;
and/or the expanding agent is calcium oxide type liquid expanding agent;
And/or the shrinkage reducing agent is an organic liquid shrinkage reducing agent;
And/or, the internal curing agent is polyacrylic acid super absorbent resin;
And/or, the silica sol is an acidic silica sol;
And/or the cement is ordinary silicate cement.
In some embodiments, the internal curing agent has a particle size of 30 to 150 μm;
and/or the particle size of the quartz sand is less than or equal to 5mm.
In some embodiments, the steel fibers are selected from copper plated fine straight steel fibers having a length of 10 to 20mm and a diameter of 0.2 to 0.3mm.
In a second aspect, the application also provides a preparation method of the ecological easy-pump high-filling ultra-high-performance concrete, which comprises the following steps:
1) Mixing and stirring an expanding agent, a shrinkage reducing agent and the vesuvianite sand, drying in vacuum, spraying silica sol on the surface of the vesuvianite sand, and sealing and standing to obtain a vesuvianite sand spare material;
2) Pre-absorbing water of the internal curing agent to obtain a spare material of the internal curing agent;
3) Mixing and stirring cement, fly ash microbeads, silica fume, stone powder, quartz sand, a water reducing agent and a defoaming agent, adding water, stirring to obtain first mixed slurry, adding a volcanic sand standby material, an internal curing agent standby material and steel fibers, and stirring to obtain the ecological type easily-pumped high-filling ultrahigh-performance concrete.
In some embodiments, step 2) "pre-absorbing the internal curing agent to obtain an internal curing agent spare material", wherein the water absorption of the internal curing agent is 10-40 times of the mass of the internal curing agent.
In some embodiments, step 1) "the conditions of vacuum drying in mixing the expansion agent, the shrinkage reducing agent, and the vesuvianite sand" are: vacuum degree is-0.06 to-0.09, and temperature is 30-60 ℃.
In some embodiments, step 3) "mixing and stirring cement, fly ash microbeads, silica fume, stone powder, quartz sand, a water reducing agent and a defoaming agent, adding water, stirring to obtain a first mixed slurry, then adding a volcanic sand spare material, an internal curing agent spare material and steel fibers, and stirring to obtain the ecological type easily-pumped high-filling ultrahigh-performance concrete. "comprising:
Adding cement, fly ash microbeads, silica fume, stone powder, quartz sand, a water reducer and a defoaming agent into a stirrer, mixing and stirring for 2-8 min at the rotating speed of 20-45 r/min, adding water, stirring for 3-10 min to obtain first mixed slurry, adding a volcanic sand spare material, an internal curing agent spare material and steel fibers, and stirring for 5-15 min to obtain the ecological easy-pump high-filling ultra-high-performance concrete.
The technical scheme provided by the application has the beneficial effects that:
1. According to the application, the dilution effect of the stone powder can release free water which participates in lubrication of the ultra-high-performance concrete gel system, so that the rolling viscous resistance of particles and the plastic viscosity of slurry are reduced, the pumpability of the slurry is further improved, the gas content is reduced, meanwhile, the filling effect and the microcrystalline core effect of the stone powder can improve the later compactness of a matrix, the durability of the matrix is improved, in addition, the stone powder belongs to a low-value admixture, the consumption of the high-carbon emission active admixture can be reduced by doping, and the low-carbon ecologization for preparing the ultra-high-performance concrete is realized.
2. According to the application, the volcanic sand and the silica sol are synergistic, the volcanic sand belongs to a high-quality natural porous carrier, and the volcanic sand is subjected to functionalization and high-valued design application, so that low-value natural minerals can be changed into valuable things, and the development concept of low carbonization in the future of building materials is met;
The micron-sized millipore with developed vesuvianite sand has a better liquid storage-liquid locking-liquid releasing function, silica sol has a certain viscosity, can encapsulate the surface openings of millipore volcanic Dan Kongdao stored with an expanding agent and a shrinking agent, and the main component active nano silicon dioxide of the silica sol can react with cement hydration products for the second time to be consumed, so that the liquid expanding agent and the shrinking agent stored in the vesuvianite are released and exert the shrinkage compensating effect, and the acidic characteristic of the silica sol can accelerate the consumption in a cementing system alkaline environment to realize the rapid and efficient release of functional components;
meanwhile, the reactive nano silicon dioxide can consume the platy calcium hydroxide crystal in the interface transition region of the millipore vesuvianite and the slurry, inhibit the directional growth of the platy calcium hydroxide crystal in the interface transition region, improve the microstructure and the mesoscopic performance of the interface transition region and promote the physical performance and the durability of the ultra-high performance concrete matrix.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a graph showing the development of the expansion rate of concrete prepared in example 1 and comparative examples 1-2 according to the present application;
FIG. 2 is a graph showing the development of the expansion rate of the concrete prepared in example 2 and comparative examples 3 to 4 according to the present application;
FIG. 3 is a graph showing steel fiber and bubble distribution of concrete prepared in example 1 of the present application;
FIG. 4 is a graph showing the steel fiber and bubble distribution of the concrete prepared in example 2 of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions in the embodiments of the present application will be clearly and completely described in the following in conjunction with the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In a first aspect, the embodiment of the application provides an ecological easy-to-pump high-filling ultra-high-performance concrete, which comprises the following raw materials in parts by mass:
700-1300 parts of cementing material, 800-1400 parts of aggregate, 50-200 parts of steel fiber, 50-150 parts of additive and 160-220 parts of water;
wherein, according to the mass portion, the cementing material includes: 550 to 1000 parts of cement, 50 to 180 parts of fly ash microbeads, 50 to 250 parts of silica fume and 30 to 150 parts of stone powder;
the aggregate comprises: 300-1300 parts of quartz sand and 50-1000 parts of vesuvianite sand;
the additive comprises: 8-30 parts of water reducer, 3-15 parts of defoamer, 20-80 parts of expanding agent, 10-50 parts of shrinkage reducing agent, 2-10 parts of internal curing agent and 10-50 parts of silica sol.
According to the scheme, the viscosity modification, internal maintenance/expansion source matching and assembly multiple composite technology of the natural mineral materials on the ultra-high performance concrete gel system is utilized, the expansion degree of the provided ecological type easily-pumped high-filling ultra-high performance concrete is 450-750 mm, the slump is 240-280 mm, and the plastic viscosity is 15-30 Pa.S; the air content is 1.8% -3%, the compression strength of the hardened body is 120-160 MPa, the flexural strength is 22-45 MPa, the elastic modulus is 40-60 GPa, the limit expansion rate is 1-10 multiplied by 10 -4, and the comprehensive improvement of the pumpability and the filling performance is realized on the basis of further strengthening the mechanical property and the durability of the hardened body.
The ball effect provided by the high sphericity of the fly ash microbeads can obviously reduce the plastic viscosity of the ultra-high performance concrete slurry, improve the fluidity of the slurry and accelerate the escape of internal bubbles, thereby improving the pumpability of the slurry and reducing the air content of the slurry.
The micro-filling effect and high volcanic ash activity of the micro-silica powder can enable ultra-high performance concrete particles to reach the closest packing state and promote the secondary hydration of a gel system, thereby improving the compactness and performance of a matrix.
The dilution effect of the stone powder can release free water which participates in lubrication of the ultra-high performance concrete gel system, thereby reducing the viscous resistance of particle rolling and the plastic viscosity of slurry, being beneficial to further improving the pumpability of the slurry and reducing the air content, and simultaneously, the filling effect of the stone powder and the microcrystalline core effect can improve the later compactness of a matrix and improve the durability of the matrix. In addition, the stone powder belongs to a low-value admixture, and the mixing of the stone powder can reduce the dosage of the high-carbon emission active admixture, thereby being beneficial to realizing the low-carbon ecologization of the preparation of the ultra-high-performance concrete.
The natural ore material vesuvianite sand is loose and porous, has better liquid storage-liquid locking-liquid releasing functions, can be used as a storage carrier of an expanding agent and a shrinkage reducing agent, and takes silica sol with viscosity as a pore sealing agent of the vesuvianite sand, and the silica sol is consumed after the cement hydration reaction to release the expanding agent and the shrinkage reducing agent in the vesuvianite pores, so that the effect of supplementing shrinkage is exerted, and the problem of low continuous expansion rate of the existing ultra-high-performance concrete is solved; meanwhile, the active nano silicon dioxide reaction contained in the silica sol can consume the platy calcium hydroxide crystal in the interface transition region of the millipore volcanic rock and the slurry, inhibit the directional growth of the platy calcium hydroxide crystal in the interface transition region, improve the microstructure and the microscopic performance of the interface transition region, and promote the physical performance and the durability of the ultra-high performance concrete matrix.
In some embodiments, the particle size of the vesuvianite sand is less than or equal to 3mm, the porosity of the vesuvianite sand is 10% -35%, the pore size of the vesuvianite sand is 5-60 μm, and the powder content of the vesuvianite sand is less than or equal to 3%.
Specifically, the volcanic sand is prepared from medium millipore volcanic sand, the medium millipore volcanic sand has the characteristic of high strength, belongs to natural minerals, has abundant reserves in the nature, is mainly used in the fields of gardens and chemical industry due to filtration, is usually ignored and abandoned, has extremely low utilization rate, and is functionally and high-valued according to the characteristics of the medium millipore volcanic sand, so that the low-value natural minerals are changed into valuables, and the future low-carbonization development concept of building materials is met.
Furthermore, the influence of the vesuvianite sand on the PH value of water is less than or equal to 0.5.
In some embodiments, the fly ash microbeads have an average particle size of 6-18 μm and a vitreous content of 90% or more;
And/or the average grain diameter of the silica fume is 0.1-1 mu m, and the content of the silica is more than or equal to 90%;
And/or the average grain diameter of the stone powder is 10-30 mu m, and the content of calcium carbonate is more than or equal to 92%.
In some embodiments, the water reducer is a polycarboxylate water reducer;
And/or, the defoamer is polyether modified silicon defoamer;
and/or the expanding agent is calcium oxide type liquid expanding agent;
And/or the shrinkage reducing agent is an organic liquid shrinkage reducing agent;
And/or, the internal curing agent is polyacrylic acid super absorbent resin;
And/or, the silica sol is an acidic silica sol;
And/or the cement is ordinary silicate cement.
In the additive, the polycarboxylate water reducer has high water reducing efficiency, is environment-friendly and pollution-free in the production, transportation and use processes, and is further preferably in a powder form;
the polyether modified silicon defoamer accelerates bubble escape by reducing the surface tension and the adhesive force of bubbles, so that the air content of the ultra-high performance concrete slurry is reduced, and further, the polyether modified silicon defoamer is preferably in a powder form;
the calcium oxide type liquid expanding agent forms expansion effect by generating calcium hydroxide crystals, an expansion source and an ultra-high performance concrete ultra-low water-gel ratio gel system have good compatibility and matching performance, and the liquid phase form provides guarantee for loading and packaging the calcium oxide type liquid expanding agent in the pores of the vesuvianite sand;
The organic liquid shrinkage reducing agent reduces the shrinkage stress by reducing the surface tension of the matrix pore solution, and the liquid phase form provides guarantee for loading and packaging the organic liquid shrinkage reducing agent in the volcanic sand pores;
The polyacrylic acid super absorbent resin is used as an internal curing carrier to provide necessary moisture for an expansion source reaction through a moisture slow release effect so as to fully excite the expansion potential of the polyacrylic acid super absorbent resin, and the polyacrylic acid super absorbent resin is further preferably in powder form, so that the powder form is better in stability and filling property, and the defects that the particle-form matters are easy to float upwards, the vibration/pumping process is easy to crack, the water loss shrinkage is introduced into holes and the like are furthest inhibited and eliminated;
the acidic property of the acidic silica sol makes the acidic silica sol quickly consume in the alkaline environment of the gelling system so as to realize the rapid and efficient release of the expanding agent and the shrinkage reducing agent.
In some embodiments, the internal curing agent has a particle size of 30 to 150 μm;
and/or the particle size of the quartz sand is less than or equal to 5mm.
In some embodiments, the steel fibers are selected from copper plated fine straight steel fibers having a length of 10 to 20mm and a diameter of 0.2 to 0.3mm.
In a second aspect, the embodiment of the application also provides a preparation method of the ecological easy-pump high-filling ultra-high-performance concrete, which comprises the following steps:
1) Mixing and stirring an expanding agent, a shrinkage reducing agent and the vesuvianite sand, drying in vacuum, spraying silica sol on the surface of the vesuvianite sand, and sealing and standing to obtain a vesuvianite sand spare material;
2) Pre-absorbing water of the internal curing agent to obtain a spare material of the internal curing agent;
3) Mixing and stirring cement, fly ash microbeads, silica fume, stone powder, quartz sand, a water reducing agent and a defoaming agent, adding water, stirring to obtain first mixed slurry, adding a volcanic sand standby material, an internal curing agent standby material and steel fibers, and stirring to obtain the ecological type easily-pumped high-filling ultrahigh-performance concrete.
Specifically, in the step 1), the expanding agent, the shrinkage-reducing agent and the high-strength porous vesuvianite sand are assembled and packaged, wherein the vacuum drying condition is favorable for improving the efficiency of storing and assembling the liquid expanding agent and the shrinkage-reducing agent in the vesuvianite sand millipore holes, and the silica sol is sprayed to actively package the liquid expanding agent and the shrinkage-reducing agent in the vesuvianite sand holes so as to play the micro-expansion function of the expanding agent and the shrinkage-reducing agent later and improve the continuous expansion rate of the concrete.
Specifically, in the step 3), the purposes of adding the formula step by step and stirring step by step are as follows: firstly, mixing and stirring cement, fly ash microbeads, silica fume, stone powder, quartz sand, a water reducing agent and a defoaming agent to ensure that a main formula has good dispersibility and homogeneity;
Secondly, adding water, fluidizing and stirring to enable the main formula to form large-flow stable slurry;
and finally adding the volcanic sand spare material, the internal curing agent spare material and the steel fiber, stirring in the flexible fluidization slurry, so that the silica sol packaging layer and the internal curing agent which are relatively fragile on the surface of the volcanic sand are protected, and the failure caused by the damage of the fragile structure due to the direct dry-mixing friction between the volcanic sand and the internal curing agent and the solid powder or the steel fiber is avoided.
In a preferred embodiment, the method for preparing the vesuvianite sand comprises the following steps:
Mechanically crushing the medium millipore volcanic rock, screening fine granular sand with continuous grading of 0-3 mm, washing volcanic Dan Xiwei granules with water, and drying to obtain the volcanic rock sand. The volcanic rock fine particles are washed with water to remove powder and impurities, so as to prevent the fine powder from blocking holes and reacting with alkali aggregates.
In some embodiments, step 2) "pre-absorbing the internal curing agent to obtain an internal curing agent spare material", the water absorption of the internal curing agent is 10-40 times of the mass of the internal curing agent.
The internal curing agent is pre-absorbed with water, and the later stage of concrete hardening can be realized by releasing water to improve the self-drying inside the concrete and inhibit self-shrinkage cracking.
In some embodiments, step 1) "mixing an expanding agent, a shrinkage-reducing agent, and a vesuvianite sand, vacuum drying" is performed under the following conditions: vacuum degree is-0.06 to-0.09, and temperature is 30-60 ℃.
Further, it is preferable that the vesuvianite sand is dried to a dry state.
In some embodiments, step 3) "mixing and stirring cement, fly ash microbeads, silica fume, stone powder, quartz sand, a water reducing agent and a defoaming agent, adding water, stirring to obtain a first mixed slurry, then adding a volcanic sand standby material, an internal curing agent standby material and steel fibers, and stirring to obtain the ecological easy-pump high-filling ultra-high-performance concrete. "comprising:
Adding cement, fly ash microbeads, silica fume, stone powder, quartz sand, a water reducer and a defoaming agent into a stirrer, mixing and stirring for 2-8 min at the rotating speed of 20-45 r/min, adding water, stirring for 3-10 min to obtain first mixed slurry, adding a volcanic sand spare material, an internal curing agent spare material and steel fibers, and stirring for 5-15 min to obtain the ecological easy-pump high-filling ultra-high-performance concrete.
The high-uniformity high-stability slurry can be obtained under the control of the stirring rotation speed and the time, and the problems of slurry instability and excessive bubble introduction caused by slurry uniformity, easiness and poor compactness due to insufficient stirring and excessive stirring are avoided.
The application uses ecological high-strength porous vesuvianite sand as aggregate, combines the vacuum assembly, active encapsulation and step-by-step stirring procedures of the components of the formulation of the expanding agent and the shrinkage reducing agent, can greatly excite the efficiency of each formulation, and realizes the optimization of the key performance of the preparation of the ultra-high performance concrete.
The ecological easy-to-pump high-filling ultra-high performance concrete and the preparation method thereof provided by the invention have higher process field degree, have engineering popularization and application values, and the prepared ultra-high performance concrete mixture and hardening body have excellent performance, including but not limited to: the expansion degree of the mixture is 450-750 mm; the slump of the mixture is 240-280 mm; the plastic viscosity of the mixture is 15-30 Pa.S; the air content of the mixture is 1.8% -3%; the compressive strength of the hardened body is 120-160 MPa; the flexural strength of the hardened body is 22-45 MPa; the elastic modulus of the hardened body is 40-60 GPa; the expansion rate of the cured product is limited to 1 to 10X 10 -4.
The application is further illustrated by the following specific examples.
The raw material description:
Ordinary Portland cement: p.o52.5 Portland cement with an average particle size of 14 μm (Huang Danhua manufactured by new cement Co., ltd.);
fly ash microbeads: the average grain diameter is 13 μm, and the glass body content is 94% (manufactured by Wuhan steel fly ash products Co., ltd.);
micro silicon powder: the average particle diameter was 0.3. Mu.m, and the silica content was 95% (produced by Hubei Xinrun chemical Co., ltd.);
stone powder: the average particle diameter was 19 μm and the calcium carbonate content was 97% (Macheng. RTM. Manufactured by Macheng. Baide stone powder development Co., ltd.);
quartz sand: particle size is less than or equal to 3mm (produced by the quartz sand factory of the martial arts pavilion);
Vesuvianite sand: the porosity is 26%, and the pore diameter is 19 mu m (mesoporous volcanic stone in Hebei producing area);
Steel fiber: fine straight copper-plated steel fibers having a length of 13mm and a diameter of 0.2mm (Bei Kaer, manufactured by applied materials science and technology Shanghai Co., ltd.);
Water reducing agent: polycarboxylic acid powder water reducer (Jiangsu Su Bote New Material Co., ltd.);
defoaming agent: polyether modified silicon powder defoamer (Jiangsu Su Bote New Material Co., ltd.);
and (3) an expanding agent: calcium oxide type liquid swelling agent (Hubei concrete source building materials Co., ltd.);
shrinkage reducing agent: organic liquid shrinkage reducers (manufactured by Jiangsu Su Bote New Material Co., ltd.);
internal curing agent: powder polyacrylic acid super absorbent resin with the particle diameter of 50-120 mu m (manufactured by Guangdong dragon lake technology Co., ltd.);
silica sol: acidic silica sol (manufactured by Zhejiang Dersine micro-nano technology Co., ltd.);
Water: tap water.
Example 1
The embodiment 1 provides ecological easy-to-pump high-filling ultra-high-performance concrete and a preparation method thereof.
The adhesive comprises the following raw materials in parts by mass:
826 parts of ordinary Portland cement, 107 parts of fly ash microbeads, 112 parts of silica fume, 83 parts of stone powder, 814 parts of quartz sand, 211 parts of vesuvianite sand, 143 parts of steel fibers, 14 parts of water reducer, 6 parts of defoamer, 47 parts of expanding agent, 23 parts of shrinkage reducer, 5 parts of internal curing agent, 22 parts of silica sol and 189 parts of water.
The preparation method comprises the following steps:
101: mechanically crushing the medium millipore volcanic stone, screening fine granular sand with the continuous grading of 0-3 mm, washing volcanic Dan Xiwei granules with water, and drying until the powder content is less than or equal to 3% and the pH influence value is less than or equal to 0.5 to obtain the volcanic stone sand;
102: uniformly mixing an expanding agent, a shrinkage reducing agent and the vesuvianite sand according to a proportion, transferring into a vacuum drying oven, drying at the vacuum degree of-0.07 and the temperature of 50 ℃ for 60min to a vesuvianite sand surface dry state, spraying silica sol onto the surface of the vesuvianite sand, sealing and standing for 30min to obtain a vesuvianite sand spare material;
103: pre-absorbing water with the mass of 22 times of the internal curing agent to obtain a spare material of the internal curing agent;
104: adding ordinary Portland cement, fly ash microbeads, silica fume, stone powder, quartz sand, a water reducer and a defoaming agent into a forced mixer according to a proportion, dry-mixing the materials for 4min at a rotating speed of 31r/min, adding water, fluidizing and stirring for 4min, sequentially adding a volcanic rock spare material, an internal curing agent spare material and steel fibers, and stirring for 6min to obtain the ecological easy-pumping high-filling ultra-high-performance concrete.
Example 2
The embodiment 2 provides ecological easy-to-pump high-filling ultra-high-performance concrete and a preparation method thereof.
The adhesive comprises the following raw materials in parts by mass:
733 parts of ordinary Portland cement, 81 parts of fly ash microbeads, 77 parts of silica fume, 131 parts of stone powder, 572 parts of quartz sand, 489 parts of vesuvianite sand, 92 parts of steel fiber, 11 parts of water reducer, 5 parts of defoamer, 39 parts of expanding agent, 26 parts of shrinkage reducing agent, 4 parts of internal curing agent, 39 parts of silica sol and 199 parts of water.
The preparation method comprises the following steps:
101: mechanically crushing the medium millipore volcanic stone, screening fine granular sand with the continuous grading of 0-2 mm, washing volcanic Dan Xiwei granules with water, and drying until the powder content is less than or equal to 3% and the pH influence value is less than or equal to 0.5 to obtain the volcanic stone sand;
102: uniformly mixing an expanding agent, a shrinkage reducing agent and the vesuvianite sand according to a proportion, transferring into a vacuum drying oven, drying at the vacuum degree of-0.08 and the temperature of 55 ℃ for 45min until the vesuvianite sand surface is dry, spraying silica sol onto the surface of the vesuvianite sand, sealing and standing for 30min to obtain a vesuvianite sand spare material;
103: pre-absorbing water with the mass of 19 times of the internal curing agent to obtain a spare material of the internal curing agent;
104: adding ordinary Portland cement, fly ash microbeads, silica fume, stone powder, quartz sand, a water reducer and a defoaming agent into a forced mixer according to a proportion, dry-mixing for 3min at a rotating speed of 28r/min, adding water, fluidizing and stirring for 5min, sequentially adding a volcanic rock spare material, an internal curing agent spare material and steel fibers, and stirring for 7min to obtain the ecological easy-pumping high-filling ultra-high-performance concrete.
Comparative example 1
This comparative example 1 provides a concrete and a method for preparing the same.
The adhesive comprises the following raw materials in parts by mass:
826 parts of ordinary Portland cement, 190 parts of I-grade fly ash, 112 parts of silica fume, 1025 parts of quartz sand, 143 parts of steel fiber, 14 parts of water reducer and 189 parts of water.
The preparation method comprises the following steps:
101: adding ordinary Portland cement, I-grade fly ash, silica fume, quartz sand and a water reducer into a forced mixer according to a proportion, dry-mixing and mixing for 4min at a rotating speed of 31r/min, adding water, fluidizing and stirring for 4min, then adding steel fibers, and stirring for 6min to obtain the concrete.
Comparative example 2
This comparative example 2 provides a concrete and a method for preparing the same.
The adhesive comprises the following raw materials in parts by mass:
826 parts of ordinary Portland cement, 190 parts of I-grade fly ash, 112 parts of silica fume, 1025 parts of quartz sand, 143 parts of steel fiber, 14 parts of water reducer, 47 parts of powder calcium oxide expanding agent, 23 parts of powder shrinkage reducer, 4 parts of internal curing agent and 189 parts of water.
The preparation method comprises the following steps:
101: adding ordinary Portland cement, I-grade fly ash, silica fume, quartz sand, a water reducing agent, a powder calcium oxide expanding agent and a powder shrinkage reducing agent into a forced stirrer according to a proportion, dry-mixing the materials for 4min at a rotating speed of 31r/min, adding water, fluidizing and stirring for 4min, then adding an internal curing agent and steel fibers, and stirring for 6min to obtain the concrete.
Comparative example 3
This comparative example 3 provides a concrete and a method for preparing the same.
The adhesive comprises the following raw materials in parts by mass:
733 parts of ordinary Portland cement, 212 parts of I-grade fly ash, 77 parts of silica fume, 1061 part of quartz sand, 92 parts of steel fiber, 11 parts of water reducer and 199 parts of water.
The preparation method comprises the following steps:
101: adding ordinary Portland cement, I-grade fly ash, silica fume, quartz sand and a water reducer into a forced mixer according to a proportion, dry-mixing and mixing for 3min at a rotating speed of 28r/min, adding water, fluidizing and stirring for 5min, then adding steel fibers, and then stirring for 7min to obtain the concrete.
Comparative example 4
This comparative example 4 provides a concrete and a method for preparing the same.
The adhesive comprises the following raw materials in parts by mass:
733 parts of ordinary Portland cement, 212 parts of I-grade fly ash, 77 parts of silica fume, 1061 part of quartz sand, 92 parts of steel fiber, 11 parts of water reducer, 39 parts of powder calcium oxide expanding agent, 26 parts of powder shrinkage reducer, 4 parts of internal curing agent and 199 parts of water.
The preparation method comprises the following steps:
101: adding ordinary Portland cement, I-grade fly ash, silica fume, quartz sand, a water reducing agent, a powder calcium oxide expanding agent and a powder shrinkage reducing agent into a forced mixer according to a proportion, dry-mixing the materials for 3min at a rotating speed of 28r/min, adding water, fluidizing and stirring for 5min, then adding steel fibers, and stirring for 7min to obtain the concrete.
Performance testing
The following performance tests were carried out on the concretes prepared in examples 1-2 and comparative examples 1-4:
(1) Expansion degree, slump and air content: the test is carried out by referring to GB/T50080-2016 Standard for Performance test of common concrete mixtures, and the test results are filled in Table 1;
(2) Plastic viscosity: test results are filled in Table 1 by reference to the concrete viscosity modifier according to T/CECS 10157-2021;
(3) Compressive strength, flexural strength, modulus of elasticity: after the concretes prepared in examples 1-2 and comparative examples 1-4 were hardened for 28 days, the test was performed with reference to a 100mm×100mm nonstandard test piece from GB/T50081-2002 Standard test method for mechanical Property of common concrete, and the test results were filled in Table 1;
(4) Limiting the expansion rate: the results of the test are shown in FIGS. 1 and 2 with reference to GB/T23439-2017, concrete expander.
Note that: in table 1, "S" represents an example, for example, "S1" represents example 1; "D" represents a comparative example, for example "D1" represents a comparative example 1".
TABLE 1
According to the test results of Table 1, in the embodiment 1-2, the volcanic sand, the expanding agent, the shrinkage reducing agent and the silica sol are combined with the stone powder, and the expansion degree and the slump of the prepared ultra-high performance concrete are better than those of the comparative examples 1-4, so that the filling and passing performance of the ultra-high performance concrete can be improved by the scheme of the application;
The lower plastic viscosity of examples 1-2 than comparative examples 1-4 demonstrates that the inventive approach can reduce the viscosity of ultra-high performance concrete and improve the pumpability of the slurry;
examples 1-2 have lower air content than comparative examples 1-4, demonstrating that the inventive arrangements can improve interfacial adhesion of ultra-high performance concrete;
the compressive strength, flexural strength and elastic modulus of examples 1-2 are all greater than those of comparative examples 1-4, demonstrating that the inventive solution can further improve the mechanical properties and durability of ultra-high performance concrete.
Referring to fig. 1 and 2, fig. 1 and 2 show development diagrams of the expansion rate limitation of the concrete prepared in examples 1-2 and comparative examples 1-4, and it can be seen from the diagrams that the ultra-high performance concrete prepared by combining the assembly technology of the vesuvianite sand, the expanding agent, the shrinkage reducing agent and the silica sol and the stone powder has good continuous micro-expansion performance, and can realize efficient filling and bonding with the inner interface of the steel tube/steel shell structure.
Referring to fig. 3 and 4, fig. 3 and 4 show the internal steel fiber and bubble distribution diagrams of the ultra-high performance concrete prepared in example 1 and example 2, respectively, and according to the drawing, it can be seen that the ultra-high performance concrete prepared by the scheme of the application has good uniformity, reasonable steel fiber orientation distribution and low porosity of air holes.
It should be noted that in the present application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The ecological easy-to-pump high-filling ultra-high performance concrete is characterized by comprising the following raw materials in parts by mass:
700-1300 parts of cementing material, 800-1400 parts of aggregate, 50-200 parts of steel fiber, 50-150 parts of additive and 160-220 parts of water;
wherein, according to the mass portion, the cementing material includes: 550 to 1000 parts of cement, 50 to 180 parts of fly ash microbeads, 50 to 250 parts of silica fume and 30 to 150 parts of stone powder;
the aggregate comprises: 300-1300 parts of quartz sand and 50-1000 parts of vesuvianite sand;
The additive comprises: 8-30 parts of water reducer, 3-15 parts of defoamer, 20-80 parts of expanding agent, 10-50 parts of shrinkage reducing agent, 2-10 parts of internal curing agent and 10-50 parts of silica sol;
The silica sol is an acidic silica sol;
the expanding agent is calcium oxide type liquid expanding agent;
the shrinkage reducing agent is an organic liquid shrinkage reducing agent;
the silica sol is used for packaging the surface openings of the vesuvianite pore canals;
the internal curing agent is polyacrylic acid super absorbent resin;
The particle size of the internal curing agent is 30-150 mu m;
when the internal curing agent is pre-absorbed to prepare the internal curing agent spare material, the water absorption capacity of the internal curing agent is 10-40 times of the mass of the internal curing agent.
2. The ecological easy-to-pump high-filling ultra-high performance concrete according to claim 1, wherein the particle size of the vesuvianite sand is less than or equal to 3mm, the porosity of the vesuvianite sand is 10% -35%, the pore size of the vesuvianite sand is 5-60 μm, and the powder content of the vesuvianite sand is less than or equal to 3%.
3. The ecological easy-to-pump high-filling ultra-high performance concrete according to claim 1, wherein the average particle size of the fly ash microbeads is 6-18 μm, and the glass content is more than or equal to 90%;
And/or the average grain diameter of the silica fume is 0.1-1 mu m, and the content of the silica is more than or equal to 90%;
And/or the average grain diameter of the stone powder is 10-30 mu m, and the content of calcium carbonate is more than or equal to 92%.
4. The ecological easy-to-pump high-filling ultra-high performance concrete according to claim 1, wherein the water reducer is a polycarboxylate water reducer;
And/or, the defoamer is polyether modified silicon defoamer;
And/or the cement is ordinary silicate cement.
5. The ecological easy-to-pump high-filling ultra-high performance concrete according to claim 1, wherein the particle size of the quartz sand is less than or equal to 5mm.
6. The ecological easy-to-pump high-filling ultra-high performance concrete according to claim 1, wherein the steel fibers are selected from copper-plated fine and straight steel fibers, the length of the steel fibers is 10-20 mm, and the diameter of the steel fibers is 0.2-0.3 mm.
7. The method for preparing the ecological easy-to-pump high-filling ultra-high-performance concrete according to any one of claims 1 to 6, which is characterized by comprising the following steps:
1) Mixing and stirring an expanding agent, a shrinkage reducing agent and the vesuvianite sand, drying in vacuum, spraying silica sol on the surface of the vesuvianite sand, and sealing and standing to obtain a vesuvianite sand spare material;
2) Pre-absorbing water of the internal curing agent to obtain a spare material of the internal curing agent;
3) Mixing and stirring cement, fly ash microbeads, silica fume, stone powder, quartz sand, a water reducing agent and a defoaming agent, adding water, stirring to obtain first mixed slurry, adding a volcanic sand standby material, an internal curing agent standby material and steel fibers, and stirring to obtain the ecological type easily-pumped high-filling ultrahigh-performance concrete.
8. The method for preparing the ecological easy-to-pump high-filling ultra-high performance concrete according to claim 7, wherein the conditions of vacuum drying in the step 1) of mixing the expanding agent, the shrinkage reducing agent and the vesuvianite sand are as follows: vacuum degree is-0.06 to-0.09, and temperature is 30-60 ℃.
9. The method for preparing the ecological easy-to-pump high-filling ultra-high performance concrete according to claim 7, wherein the step 3) is to mix and stir cement, fly ash microbeads, silica fume, stone powder, quartz sand, a water reducing agent and a defoaming agent, add water, stir to obtain a first mixed slurry, then add a volcanic sand spare material, an internal curing agent spare material and steel fibers, and stir to obtain the ecological easy-to-pump high-filling ultra-high performance concrete, and comprises the following steps:
Adding cement, fly ash microbeads, silica fume, stone powder, quartz sand, a water reducer and a defoaming agent into a stirrer, mixing and stirring for 2-8 min at the rotating speed of 20-45 r/min, adding water, stirring for 3-10 min to obtain first mixed slurry, adding a volcanic sand spare material, an internal curing agent spare material and steel fibers, and stirring for 5-15 min to obtain the ecological easy-pump high-filling ultra-high-performance concrete.
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| US11447419B2 (en) * | 2019-12-30 | 2022-09-20 | Qingdao university of technology | Lightweight aggregate ultra-high performance concrete (UHPC) and preparation method thereof |
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| CN113773018A (en) * | 2021-09-17 | 2021-12-10 | 中山市灵湾新材料科技有限公司 | Low-shrinkage high-crack-resistance ultrahigh-performance concrete and preparation method thereof |
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