CN117567130A - Retarding and rapid hardening PVA fiber cement-based composite material and preparation method and application thereof - Google Patents
Retarding and rapid hardening PVA fiber cement-based composite material and preparation method and application thereof Download PDFInfo
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- CN117567130A CN117567130A CN202410050976.3A CN202410050976A CN117567130A CN 117567130 A CN117567130 A CN 117567130A CN 202410050976 A CN202410050976 A CN 202410050976A CN 117567130 A CN117567130 A CN 117567130A
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- 239000004568 cement Substances 0.000 title claims abstract description 67
- 239000002131 composite material Substances 0.000 title claims abstract description 54
- 239000000835 fiber Substances 0.000 title claims abstract description 50
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 230000000979 retarding effect Effects 0.000 title abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 24
- 239000011268 mixed slurry Substances 0.000 claims abstract description 22
- 230000008439 repair process Effects 0.000 claims abstract description 21
- 239000000843 powder Substances 0.000 claims abstract description 19
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 239000002562 thickening agent Substances 0.000 claims abstract description 17
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 11
- 230000002787 reinforcement Effects 0.000 claims abstract description 8
- 239000013530 defoamer Substances 0.000 claims abstract description 6
- 239000004816 latex Substances 0.000 claims abstract description 6
- 229920000126 latex Polymers 0.000 claims abstract description 6
- 238000003756 stirring Methods 0.000 claims description 26
- 230000007547 defect Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 239000002699 waste material Substances 0.000 claims description 11
- 239000006004 Quartz sand Substances 0.000 claims description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 239000002956 ash Substances 0.000 claims description 9
- 239000000919 ceramic Substances 0.000 claims description 9
- 239000011521 glass Substances 0.000 claims description 9
- 239000004575 stone Substances 0.000 claims description 9
- 239000003513 alkali Substances 0.000 claims description 8
- 238000010791 quenching Methods 0.000 claims description 8
- 230000000171 quenching effect Effects 0.000 claims description 8
- 229910052791 calcium Inorganic materials 0.000 claims description 6
- 239000011575 calcium Substances 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 6
- 239000010881 fly ash Substances 0.000 claims description 6
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 claims description 6
- 229960002261 magnesium phosphate Drugs 0.000 claims description 6
- 229910000157 magnesium phosphate Inorganic materials 0.000 claims description 6
- 239000004137 magnesium phosphate Substances 0.000 claims description 6
- 235000010994 magnesium phosphates Nutrition 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 6
- 239000002518 antifoaming agent Substances 0.000 claims description 5
- 239000004567 concrete Substances 0.000 claims description 5
- 239000000428 dust Substances 0.000 claims description 5
- 238000007711 solidification Methods 0.000 claims description 5
- 230000008023 solidification Effects 0.000 claims description 5
- 239000012190 activator Substances 0.000 claims description 4
- 239000000839 emulsion Substances 0.000 claims description 4
- 239000003469 silicate cement Substances 0.000 claims description 4
- 238000009736 wetting Methods 0.000 claims description 4
- 238000007599 discharging Methods 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 2
- 239000004566 building material Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 40
- 239000000463 material Substances 0.000 description 14
- 238000010276 construction Methods 0.000 description 13
- 239000002002 slurry Substances 0.000 description 8
- 230000003014 reinforcing effect Effects 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000005266 casting Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- -1 admixture Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 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
- C04B28/34—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 cold phosphate binders
- C04B28/344—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 cold phosphate binders the phosphate binder being present in the starting composition solely as one or more phosphates
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/72—Repairing or restoring existing buildings or building materials
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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 invention relates to the technical field of building materials, in particular to a retarding and rapid hardening PVA fiber cement-based composite material and a preparation method and application thereof, wherein the raw materials comprise, by mass, 250-860 parts of cement raw materials, 380-1000 parts of admixture, 400-580 parts of aggregate, 0.5-3.0 parts of dispersible latex powder, 10-40 parts of early strength agent, 0.5-2 parts of retarder, 0.2-3 parts of alkali-excitant, 2-9 parts of water reducer, 0.8-2.5 parts of thickener, 1.5-7 parts of defoamer, 6-26 parts of PVA fiber, 280-450 parts of water, and 1200-1300 parts of cement raw materials and admixture. The PVA fiber cement-based composite material is prepared by firstly preparing mixed slurry and transporting the mixed slurry to a required position, and can be hardened in a short time without generating initial setting, so that the application requirements of various projects such as in-service foundation repair and reinforcement, municipal engineering, airport quick repair and the like can be met.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a retarding and rapid hardening PVA fiber cement-based composite material, a preparation method and application thereof.
Background
In the service process of the constructed and put-into-service foundations such as building foundations, bridge foundations and electric power iron tower foundations, the surface defects such as defects, cracks and the like with different degrees are inevitably generated on the service foundations along with adverse effects of natural environment on weathering, corrosion and the like of the service foundations, and local falling is possibly caused seriously. Although small-scale surface defects do not immediately have a great influence on the bearing strength of the in-service foundation, if left alone for a long time, the surface defects gradually expand and go deep, causing deeper corrosion and damage, and adversely affecting the durability of the in-service foundation.
In order to prevent the in-service foundation from being further corroded and damaged, improve the durability of the in-service foundation and prolong the service life of the in-service foundation, the surface defects of the in-service foundation need to be reinforced and repaired in time, and the surface is repaired. In the prior art, cement is used as a main material to prepare a repairing material, and methods such as pouring and the like are used for repairing and reinforcing an in-service foundation with surface defects.
As the in-service foundation is put into use, the repair and reinforcement engineering in reality has the requirements of short construction time and small construction area, and simultaneously has the requirements of certain strength and quick hardening capable of recovering normal use in a short time after repair. Particularly, for an in-service foundation which is built at a remote position, if raw materials are transported to a site to prepare slurry of the repair material, the construction time is too long, the construction area is too large, the repair material is difficult to reach the required strength in a short time after construction, and the normal use cannot be quickly recovered; the method of preparing the repair material into slurry and transporting the slurry to site construction in advance saves construction time and construction area, but because of the excessive uncertain factors of transportation and site construction, the problems of initial setting and waste of the repair material caused by the fact that the repair material cannot be poured in time can occur, so the repair material is required to have a setting retarding function without setting for a long time. However, the existing repairing material is difficult to have two functions of retarding and rapid hardening at the same time, the repairing and reinforcing engineering of the in-service foundation cannot meet the requirements of short construction time, small construction area, certain strength and normal use recovery in a short time after repairing.
Disclosure of Invention
Aiming at the problem that the existing repair material is difficult to have two functions of retarding and rapid hardening, the invention provides a retarding rapid hardening PVA fiber cement-based composite material, a preparation method and application thereof.
In a first aspect, the invention provides a retarding and rapid hardening PVA fiber cement-based composite material, which comprises, by mass, 250-860 parts of cement raw materials, 380-1000 parts of admixture, 400-580 parts of aggregate, 0.5-3.0 parts of dispersible latex powder, 10-40 parts of early strength agent, 0.5-2 parts of retarder, 0.2-3 parts of alkali-activator, 2-9 parts of water reducer, 0.8-2.5 parts of thickener, 1.5-7 parts of defoamer, 6-26 parts of PVA fiber, 280-450 parts of water, and 1200-1300 parts of cement raw materials and admixture in total;
wherein the cement raw materials comprise 250-860 parts of silicate cement and 0-400 parts of magnesium phosphate cement; the admixture comprises 370-1000 parts of I-level high-calcium fly ash, 0-360 parts of blast furnace water quenching waste residue and 0-150 parts of volcanic ash; the aggregate comprises 260-580 parts of quartz sand, 0-150 parts of ceramic fine aggregate, 0-170 parts of glass micropowder and 0-150 parts of stone dust powder.
Further, the particle size of the quartz sand is 0.075-0.125mm;
the grain diameter of the blast furnace water quenching waste slag is 0.090-0.150mm;
the grain diameter of the ceramic fine aggregate is 0.090-0.150mm;
the grain size of the glass micropowder is 0.075-0.125mm;
in the stone chip powder, the components with the granularity less than or equal to 40 mu m account for 10wt%, the components with the granularity less than or equal to 100 mu m of 40 mu m account for 80wt%, and the components with the granularity more than 100 mu m account for 10wt%;
the fineness of the volcanic ash is 0.045mm, the allowance of a 45 mu m square hole sieve is less than or equal to 15%, the activity index is 70-80%, and the loss on ignition is 0.5-5.0%;
the early strength agent, the retarder, the alkali-activated agent, the water reducer, the thickener and the defoamer are all common additives in the field.
Furthermore, the PVA fiber cement-based composite material is slurry before solidification, has strong cohesiveness and good fluidity; the compressive strength of the PVA fiber cement-based composite material after being prepared is 20-35MPa, and the compressive strength after being completely solidified is 50-90MPa, so that the PVA fiber cement-based composite material has good durability, excellent freezing resistance and corrosion resistance.
In a second aspect, the invention provides a method for preparing the PVA fiber cement-based composite material, which comprises the following steps:
(1) Wetting the stirrer with water;
(2) Adding the cement raw material and the admixture into a stirrer, and stirring at a low speed;
(3) Uniformly mixing a water reducing agent, a defoaming agent and water, then adding the mixture into a stirrer, and stirring at a low speed and then at a high speed;
(4) Adding dispersible emulsion powder, retarder and 10% -50% thickener into a stirrer, and stirring at low speed; firstly, adding part of thickening agent to enable the slurry to have certain viscosity, so that the slurry is favorable for fully dispersing the fibers after being added; however, if all the thickening agents are added, the viscosity of the slurry is too high, so that the slurry is stuck on the inner wall of the transport tank car to cause waste in the transport process, and the viscosity of the material is increased and the construction difficulty is increased as the transport time is increased or the material cannot be poured on site in time;
(5) Adding aggregate and PVA fiber into a stirrer, and stirring at a low speed to obtain mixed slurry;
(6) Discharging the mixed slurry in the stirrer and transporting to a required position;
(7) And after the mixed slurry reaches a required position, adding the early strength agent, the alkali-activated agent and the residual thickening agent into the mixed slurry, and uniformly stirring to obtain the PVA fiber cement-based composite material.
Further, in the step (2), the stirrer uses rotation speed of 140+/-2 r/min and revolution speed of 62+/-2 r/min for stirring for 20-90s;
in the step (3), the stirrer firstly uses the rotation speed of 140+ -2 r/min and revolution speed of 62+ -2 r/min to stir for 30-90s, and then uses the rotation speed of 285+ -3 r/min and revolution speed of 125+ -3 r/min to stir for 20-90s;
in the step (4), the stirrer is used for stirring for 20-90s at a rotating speed of 140+/-2 r/min and 62+/-2 r/min revolution;
in the step (5), the stirrer is used for stirring for 20-90s at the rotating speed of 140+ -2 r/min and the revolution speed of 62+ -2 r/min.
In a third aspect, the invention provides an application of the PVA fiber cement-based composite material, wherein the PVA fiber cement-based composite material is applied to repairing and reinforcing engineering, municipal engineering or airport rapid repairing engineering of a defective in-service foundation, and the in-service foundation comprises a building foundation, a bridge foundation and an electric power iron tower foundation.
Further, the PVA fiber cement-based composite material is applied to repairing and reinforcing engineering of the in-service foundation with defects, and the concrete operation is that the PVA fiber cement-based composite material before solidification is directly poured at the position of the defects of the in-service foundation, and the repairing and reinforcing engineering is completed after the PVA fiber cement-based composite material is solidified.
In addition, the PVA fiber cement-based composite material is applied to repairing and reinforcing engineering of a defective in-service foundation, and the concrete operation can be that the PVA fiber cement-based composite material is firstly manufactured into a composite material prefabricated part with a required shape, then the composite material prefabricated part is fixed on the periphery of the in-service foundation, the gap between the in-service foundations of the composite material prefabricated part is filled with the non-solidified PVA fiber cement-based composite material, and the repairing and reinforcing engineering is completed after the PVA fiber cement-based composite material is solidified.
The invention has the beneficial effects that:
the invention firstly uses cement raw materials, admixture, water reducer, defoamer, water, dispersible latex powder, retarder and partial thickener to prepare mixed slurry, and adds early strength agent, alkali excitant and residual thickener into the mixed slurry after the mixed slurry is transported to a required position to further prepare the PVA fiber cement-based composite material. The mixed slurry has excellent retarding effect, and can not generate initial setting in the long-time transportation process so as to be unusable; the PVA fiber cement-based composite material prepared after being transported to the required position has a rapid hardening function, can be hardened to reach a certain strength in a short time, can meet the requirements of rapid repair and rapid recovery for normal use, is flexible to use and strong in universality, and can meet the application requirements of various projects, such as in-service foundation repair and reinforcement projects, municipal projects and airport rapid repair projects.
Detailed Description
In order to better understand the technical solutions of the present invention, the following description will clearly and completely describe the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
Example 1
The PVA fiber cement-based composite material comprises, by weight, 300 parts of Portland cement, 80 parts of magnesium phosphate cement, 600 parts of I-grade high-calcium fly ash, 190 parts of blast furnace water-quenched waste residue, 100 parts of volcanic ash, 260 parts of quartz sand, 50 parts of ceramic fine aggregate, 100 parts of glass micropowder, 50 parts of stone dust powder, 1.0 part of dispersible latex powder, 40 parts of early strength agent, 2.0 parts of retarder, 2.0 parts of alkali-activated agent, 4.5 parts of water reducer, 1.3 parts of thickener, 1.5 parts of defoamer, 13 parts of PVA fiber and 305 parts of water.
Wherein the particle size of the quartz sand is 0.075-0.125mm;
the grain diameter of the blast furnace water quenching waste slag is 0.090-0.150mm;
the grain diameter of the ceramic fine aggregate is 0.090-0.150mm;
the grain size of the glass micropowder is 0.075-0.125mm;
in the stone chip powder, the components with the granularity less than or equal to 40 mu m account for 10wt%, the components with the granularity less than or equal to 100 mu m of 40 mu m account for 80wt%, and the components with the granularity more than 100 mu m account for 10wt%;
the fineness of the volcanic ash is 0.045mm, the allowance of a 45 mu m square hole sieve is less than or equal to 15%, the activity index is 74%, and the loss on ignition is 1.1%.
The preparation method comprises the following steps:
(1) Mixer with water wetting
(2) Adding silicate cement, magnesium phosphate cement, I-level high-calcium fly ash, blast furnace water quenching waste slag and volcanic ash into a stirrer, and stirring for 60s by using the rotation speed of 140+/-2 r/min and revolution speed of 62+/-2 r/min;
(3) The water reducing agent, the defoaming agent and the water are added into a stirrer after being uniformly mixed, the stirrer is firstly stirred for 60s by using the rotating speed of 140+/-2 r/min and 62+/-2 r/min revolution, and then is stirred for 60s by using the rotating speed of 285+/-3 r/min and 125+/-3 r/min revolution;
(4) Adding the dispersible emulsion powder, the retarder and the 50% thickener into a stirrer, and stirring for 60s by using the rotation speed of 140+/-2 r/min and the revolution speed of 62+/-2 r/min;
(5) Adding quartz sand, ceramic fine aggregate, glass micropowder, stone dust powder and PVA fiber into a stirrer, and stirring the stirrer for 60s by using a rotating speed of 140+/-2 r/min and a revolving speed of 62+/-2 r/min to obtain mixed slurry;
(6) Discharging the mixed slurry in the stirrer and transporting to a required position;
(7) And after the mixed slurry reaches a required position, adding the early strength agent, the alkali-activated agent and the residual thickening agent into the mixed slurry, and uniformly stirring to obtain the PVA fiber cement-based composite material.
Examples 2 to 4
The preparation procedure of the PVA fiber cement-based composite material with delayed setting and rapid hardening, the raw material composition ratio of which is shown in Table 1, was the same as that of example 1.
Comparative example 1
The cement-based composite material was prepared in the same manner as in example 1 except that retarder was not added in step (4) and early strength agent and alkali-activator were not added in step (7) as shown in the raw material composition ratio Table 1.
Comparative example 2
The cement-based composite material was prepared in the same manner as in example 1 except that retarder was not added in step (4) and early strength agent was not added in step (7) as shown in the following Table 1.
Comparative example 3
The cement-based composite material comprises the following raw material components in proportion shown in table 1:
(1) Mixer with water wetting
(2) Adding silicate cement, magnesium phosphate cement, I-level high-calcium fly ash, blast furnace water quenching waste slag and volcanic ash into a stirrer, and stirring for 60s by using the rotation speed of 140+/-2 r/min and revolution speed of 62+/-2 r/min;
(3) The water reducing agent, the defoaming agent and the water are added into a stirrer after being uniformly mixed, the stirrer is firstly stirred for 60s by using the rotating speed of 140+/-2 r/min and 62+/-2 r/min revolution, and then is stirred for 60s by using the rotating speed of 285+/-3 r/min and 125+/-3 r/min revolution;
(4) Adding the dispersible emulsion powder, the retarder, the thickener, the early strength agent and the alkali excitant into a stirrer, and stirring for 60s by using the rotation speed of 140+/-2 r/min and the revolution speed of 62+/-2 r/min;
(5) Quartz sand, ceramic fine aggregate, glass micropowder, stone dust powder and PVA fiber are added into a stirrer, the stirrer is stirred for 60 seconds by using a rotating speed of 140+/-2 r/min and a revolving speed of 62+/-2 r/min, and mixed slurry is prepared and directly used as a cement-based composite material.
Comparative example 4
The cement-based composite material was prepared in the same manner as in comparative example 3 except that the early strength agent and the alkali-activator were not added in step (4) as shown in the raw material composition ratio Table 1.
Comparative example 5
The cement-based composite material was prepared in the same manner as in comparative example 3 except that retarder was not added in step (4) as shown in the raw material composition ratio Table 1.
Table 1 proportions (parts by mass) of raw material components of examples and comparative examples
| Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | |
| Portland cement | 300 | 280 | 260 | 500 | 380 | 280 | 300 | 300 | 300 |
| Magnesium phosphate cement | 80 | 100 | 120 | 0 | 0 | 100 | 80 | 80 | 80 |
| I-grade high-calcium fly ash | 600 | 500 | 500 | 400 | 890 | 600 | 600 | 600 | 600 |
| Blast furnace water quenching waste slag | 190 | 290 | 290 | 200 | 0 | 190 | 190 | 190 | 190 |
| Volcanic ash | 100 | 100 | 100 | 150 | 0 | 100 | 100 | 100 | 100 |
| Quartz sand | 260 | 310 | 410 | 410 | 460 | 260 | 260 | 260 | 260 |
| Ceramic fine aggregate | 50 | 50 | 0 | 0 | 0 | 50 | 50 | 50 | 50 |
| Glass micropowder | 100 | 50 | 50 | 50 | 0 | 100 | 100 | 100 | 100 |
| Stone chip powder | 50 | 50 | 0 | 0 | 0 | 50 | 50 | 50 | 50 |
| Dispersible latex powder | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 |
| Early strength agent | 40 | 30 | 30 | 40 | 0 | 0 | 40 | 0 | 40 |
| Retarder agent | 2.0 | 1.5 | 2.0 | 1.5 | 0 | 0 | 2.0 | 2.0 | 0 |
| Alkali-activated agent | 2.0 | 2.0 | 1.5 | 1.2 | 0 | 1.5 | 2.0 | 0 | 2.0 |
| Water reducing agent | 4.5 | 4.5 | 5.0 | 5.0 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 |
| Thickening agent | 1.3 | 1.5 | 2.0 | 2.0 | 2.0 | 1.3 | 1.3 | 1.3 | 1.3 |
| Defoaming agent | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 | 1.5 |
| PVA | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 | 13 |
| Water and its preparation method | 305 | 305 | 305 | 305 | 305 | 305 | 305 | 305 | 305 |
The initial setting time of the mixed slurries prepared in step (5) of examples 1 to 4 and comparative examples 1 to 2 was measured, and the results are shown in Table 2.
TABLE 2 initial setting time of the mixed slurries of examples and comparative examples
| Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | |
| Initial setting time (min) | 286 | 272 | 267 | 283 | 193 | 131 | 89 | 277 | 69 |
The cement-based composite materials of examples 1 to 4 and comparative examples 1 to 5 were cast immediately after being cast, and the compressive strength of each period of time after the casting of each example and comparative example was measured, and the results are shown in Table 3.
Table 3 compressive strength of cement-based composites of examples and comparative examples
| Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | |
| 4h intensity (MPa) | 21.6 | 21.4 | 23.2 | 27.1 | 6.7 | 7.3 | 23.1 | 0 | 22.3 |
| 3d Strength (MPa) | 42.1 | 43.3 | 42.7 | 52.3 | 30.4 | 36.8 | 43.2 | 32.3 | 42.5 |
| 28d strength (MPa) | 50.7 | 53.5 | 52.8 | 61.3 | 53.4 | 50.6 | 51.3 | 52.9 | 50.4 |
Among them, comparative example 4 was not yet coagulated after casting for 4 hours, and compressive strength could not be measured, so the 4-hour strength of comparative example 4 was recorded as 0.
It can be seen that the mixed slurries prepared in examples 1-4 have initial setting times of more than 4 hours, and have excellent retarding performance compared with comparative examples 1-3 and comparative example 5, so that the needs of long-time and long-distance transportation can be met; while the retarder and the early strength agent are added in the comparative example 3, the retarder effect of the retarder cannot be fully exerted under the influence of the accelerating coagulation effect of the early strength agent, and the initial coagulation time is short; comparative example 5, which was not only added with retarder, but also with early strength agent to accelerate setting, resulted in shorter initial setting time; comparative example 4, although having a long initial setting time, could not obtain a high compressive strength in a short time, and had not been set 4 hours after casting, and could not measure the compressive strength, and therefore did not meet the requirements of hardening, quick repair, and quick recovery for normal use in a short time.
Meanwhile, the PVA fiber cement-based composite material prepared in the examples 1-4 can have compressive strength of more than 20MPa after being poured for 4 hours, which is far higher than that of the comparative examples 1-2 and 4, and has good quick hardening performance; the strength of the comparative example 3 and the comparative example 5 can reach more than 20MPa even if the strength of the comparative example is 4 hours, but the initial setting time is short, the method is only suitable for the existing production and the use, has high requirements on the field construction area, and can not be transported for a long time;
according to the requirements in industry, the concrete material should reach the design strength within 28 days after pouring, and the compressive strength of the concrete material in the examples 1-4 after pouring for 28 days is more than 50MPa, so that the compressive requirement of the bearing member can be met; and the compressive strength of the examples 1-4 after casting for 3d can reach more than 80% of the design strength, which is obviously higher than that of the comparative examples 1-2 and 4, and further proves that the examples 1-4 have good quick hardening performance.
Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and it is intended that all such modifications and substitutions be within the scope of the present invention/be within the scope of the present invention as defined by the appended claims.
Claims (8)
1. The PVA fiber cement-based composite material is characterized by comprising, by mass, 250-860 parts of cement raw materials, 380-1000 parts of admixture, 400-580 parts of aggregate, 0.5-3.0 parts of dispersible latex powder, 10-40 parts of early strength agent, 0.5-2 parts of retarder, 0.2-3 parts of alkali-activator, 2-9 parts of water reducer, 0.8-2.5 parts of thickener, 1.5-7 parts of defoamer, 6-26 parts of PVA fibers and 280-450 parts of water, wherein the total weight of the cement raw materials and the admixture is 1200-1300 parts;
wherein the cement raw materials comprise 250-860 parts of silicate cement and 0-400 parts of magnesium phosphate cement; the admixture comprises 370-1000 parts of I-level high-calcium fly ash, 0-360 parts of blast furnace water quenching waste residue and 0-150 parts of volcanic ash; the aggregate comprises 260-580 parts of quartz sand, 0-150 parts of ceramic fine aggregate, 0-170 parts of glass micropowder and 0-150 parts of stone dust powder.
2. The PVA fiber cement based composite material as in claim 1, wherein the particle size of the quartz sand is 0.075-0.125mm;
the grain diameter of the blast furnace water quenching waste slag is 0.090-0.150mm;
the grain diameter of the ceramic fine aggregate is 0.090-0.150mm;
the grain size of the glass micropowder is 0.075-0.125mm;
in the stone chip powder, the components with the granularity less than or equal to 40 mu m account for 10wt%, the components with the granularity less than or equal to 100 mu m of 40 mu m account for 80wt%, and the components with the granularity more than 100 mu m account for 10wt%;
the fineness of the volcanic ash is 0.045mm, the allowance of a 45 mu m square hole sieve is less than or equal to 15%, the activity index is 70% -80%, and the loss on ignition is 0.5% -5.0%.
3. The PVA fiber cement based composite material according to claim 1, wherein the compressive strength after 4 hours of the preparation of the PVA fiber cement based composite material is 20 to 35MPa and the compressive strength after complete solidification is 50 to 90MPa.
4. A method of preparing the PVA fiber cement based composite material as claimed in claim 1, comprising the steps of:
(1) Wetting the stirrer with water;
(2) Adding the cement raw material and the admixture into a stirrer, and stirring at a low speed;
(3) Uniformly mixing a water reducing agent, a defoaming agent and water, then adding the mixture into a stirrer, and stirring at a low speed and then at a high speed;
(4) Adding dispersible emulsion powder, retarder and 10% -50% thickener into a stirrer, and stirring at low speed;
(5) Adding aggregate and PVA fiber into a stirrer, and stirring at a low speed to obtain mixed slurry;
(6) Discharging the mixed slurry in the stirrer and transporting to a required position;
(7) And after the mixed slurry reaches a required position, adding the early strength agent, the alkali-activated agent and the residual thickening agent into the mixed slurry, and uniformly stirring to obtain the PVA fiber cement-based composite material.
5. The method according to claim 4, wherein in the step (2), the stirrer rotates at a speed of 140.+ -. 2r/min and revolves at a speed of 62.+ -. 2r/min, and the stirrer stirs for 20-90s;
in the step (3), the stirrer firstly uses the rotation speed of 140+ -2 r/min and revolution speed of 62+ -2 r/min to stir for 30-90s, and then uses the rotation speed of 285+ -3 r/min and revolution speed of 125+ -3 r/min to stir for 20-90s;
in the step (4), the stirrer is used for stirring for 20-90s at a rotating speed of 140+/-2 r/min and 62+/-2 r/min revolution;
in the step (5), the stirrer is used for stirring for 20-90s at the rotating speed of 140+ -2 r/min and the revolution speed of 62+ -2 r/min.
6. Use of the PVA fiber cement based composite material as claimed in claim 1, in repair reinforcement engineering, municipal engineering or airport rapid repair engineering of in-service foundations including building foundations, bridge foundations, power tower foundations, which create defects.
7. The use according to claim 6, wherein the PVA fiber cement based composite is applied in repair reinforcement of an in-service foundation creating a defect, and the concrete operation is to directly cast the PVA fiber cement based composite before solidification at the site of the in-service foundation defect, and the repair reinforcement is completed after solidification of the PVA fiber cement based composite.
8. The use of claim 6, wherein the PVA fiber cement based composite is used in repair reinforcement of an in-service foundation where defects are created, and the method comprises the steps of forming the PVA fiber cement based composite into a composite preform of a desired shape, fixing the composite preform to the periphery of the in-service foundation, filling the gaps between the in-service foundations with uncured PVA fiber cement based composite, and completing the repair reinforcement after the PVA fiber cement based composite is cured.
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