CN115353349B - C60 high-mud-content machine-made sand large-flow-state concrete and preparation method thereof - Google Patents
C60 high-mud-content machine-made sand large-flow-state concrete and preparation method thereof Download PDFInfo
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- CN115353349B CN115353349B CN202210994613.6A CN202210994613A CN115353349B CN 115353349 B CN115353349 B CN 115353349B CN 202210994613 A CN202210994613 A CN 202210994613A CN 115353349 B CN115353349 B CN 115353349B
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- 239000004567 concrete Substances 0.000 title claims abstract description 129
- 239000004576 sand Substances 0.000 title claims abstract description 104
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 147
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 56
- 239000004575 stone Substances 0.000 claims abstract description 50
- 239000000843 powder Substances 0.000 claims abstract description 48
- 239000002253 acid Substances 0.000 claims abstract description 43
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000011575 calcium Substances 0.000 claims abstract description 30
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 30
- 230000001603 reducing effect Effects 0.000 claims abstract description 28
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims abstract description 28
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims abstract description 28
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims abstract description 28
- 230000009467 reduction Effects 0.000 claims abstract description 21
- 239000011398 Portland cement Substances 0.000 claims abstract description 19
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 16
- 150000003863 ammonium salts Chemical group 0.000 claims abstract description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 100
- 230000000694 effects Effects 0.000 claims description 39
- 238000003756 stirring Methods 0.000 claims description 37
- 239000002245 particle Substances 0.000 claims description 28
- 238000002156 mixing Methods 0.000 claims description 26
- 229920000289 Polyquaternium Polymers 0.000 claims description 19
- 239000003623 enhancer Substances 0.000 claims description 14
- 239000004568 cement Substances 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 10
- SPWDQSXYMZXSIV-UHFFFAOYSA-N 11,12-dimethyldocosane Chemical group CCCCCCCCCCC(C)C(C)CCCCCCCCCC SPWDQSXYMZXSIV-UHFFFAOYSA-N 0.000 claims description 8
- 239000011800 void material Substances 0.000 claims description 8
- 239000002893 slag Substances 0.000 claims description 5
- 235000019738 Limestone Nutrition 0.000 claims description 4
- 239000006028 limestone Substances 0.000 claims description 4
- 239000011324 bead Substances 0.000 claims description 3
- 229910021487 silica fume Inorganic materials 0.000 claims description 3
- 239000000654 additive Substances 0.000 claims description 2
- 230000000996 additive effect Effects 0.000 claims description 2
- 239000003513 alkali Substances 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 239000004927 clay Substances 0.000 abstract description 21
- 239000000463 material Substances 0.000 abstract description 14
- 238000001179 sorption measurement Methods 0.000 abstract description 12
- 229920005646 polycarboxylate Polymers 0.000 abstract description 5
- 230000003313 weakening effect Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 24
- 239000003469 silicate cement Substances 0.000 description 18
- 230000000740 bleeding effect Effects 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 239000010881 fly ash Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 239000002002 slurry Substances 0.000 description 7
- 230000004907 flux Effects 0.000 description 5
- 238000006703 hydration reaction Methods 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- 238000010998 test method Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- 230000009977 dual effect Effects 0.000 description 4
- 230000000274 adsorptive effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000036571 hydration Effects 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 229910021645 metal ion Inorganic materials 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 238000005204 segregation Methods 0.000 description 3
- 239000008030 superplasticizer Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000979 retarding effect Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 244000179970 Monarda didyma Species 0.000 description 1
- 235000010672 Monarda didyma Nutrition 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000013538 functional additive Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 239000008204 material by function Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
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- 238000005728 strengthening Methods 0.000 description 1
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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
-
- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
-
- 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 belongs to the technical field of engineering materials, and particularly relates to C60 high-mud-content machine-made sand large-flow-state concrete and a preparation method thereof. The technical key points are as follows: comprises the following components in percentage by mass: 11.37-13.83% of Portland cement, 2.96-3.79% of viscosity-reducing reinforcing agent, 2.96-3.79% of superfine heavy calcium powder, 28.31-28.69% of high-mud-content machined sand, 46.17-46.68% of crushed stone, 5.5-5.73% of water, 0.002-0.013% of sodium hexametaphosphate, 0.002-0.013% of polyquaternary ammonium salt and 0.016-0.034% of anti-mud type polycarboxylic acid high-performance water reducer. The invention reduces the problems of weakening of water reducing effect and reduction of concrete slump caused by adsorption of clay to the polycarboxylate water reducer, and realizes the large flow state of the machine-made sand concrete with high C60 mud content.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to C60 high-mud-content machine-made sand large-flow-state concrete and a preparation method thereof.
Background
With the increasing lack of natural aggregate, the machine-made sand aggregate is increasingly widely applied in engineering. Unlike river sand, the machine-made sand has the characteristics of being rich in stone powder, containing a certain amount of mud and the like. The mud in the machine-made sand is generally produced by the fact that crack soil and mountain covering soil are adhered to the surface of aggregate in the production process of the machine-made sand, particularly the clay with strong adhesion is remained on the surface of machine-made sand particles after washing for many times due to the strong adhesion force, so that the MB value of the machine-made sand exceeds the standard requirement, and the mud content is too high.
The mud content of aggregate is one of the main causes of deterioration of concrete properties. The concrete slump loss is increased, and the influence on the concrete construction performance is great. The mud contained in the aggregate also causes the problems of reduced strength, increased risk of shrinkage cracking, deteriorated durability and the like of the concrete.
In view of the defects existing in the existing large-flow-state concrete, the inventor actively researches and innovates based on the practice experience and professional knowledge which are rich for many years and are applied in combination with the application of the theory to create the C60 high-mud-content machine-made sand large-flow-state concrete and the preparation method thereof. After continuous research and design and repeated sample test and improvement, the invention with practical value is finally created.
Disclosure of Invention
The invention aims to provide the C60 high-mud-content machine-made sand large-flow-state concrete, so that the slump and strength of the C60 high-mud-content machine-made sand concrete are greatly improved, the durability of the concrete is improved, the feasibility of applying the high-mud-content machine-made sand in the C60 large-flow-state concrete is realized, and the concrete has good economic benefit and practical value.
The technical aim of the invention is realized by the following technical scheme:
the invention provides a C60 high-mud-content machine-made sand large-flow-state concrete, which comprises the following components in percentage by mass: 11.37 to 13.83 percent of Portland cement, 2.96 to 3.79 percent of viscosity reducing reinforcing agent, 2.96 to 3.79 percent of superfine heavy calcium powder, 28.31 to 28.69 percent of high mud content machine-made sand, 46.17 to 46.68 percent of broken stone, 5.5 to 5.73 percent of water, 0.002 to 0.013 percent of sodium hexametaphosphate, 0.002 to 0.013 percent of polyquaternary ammonium salt and 0.016 to 0.034 percent of mud-resistant polycarboxylic acid high-performance water reducer.
Further, the Portland cement is early strength 52.5-grade ordinary Portland cement.
In the invention, the ordinary Portland cement is a cementing material of a concrete system, plays a role of cementing agent and is key for generating strength in concrete, but the higher the water demand of the ordinary Portland cement is, and the strength required by the concrete can be provided when the Portland cement accounts for 11.37-13.83 percent, and the water consumption is moderate.
Further, the viscosity reducing reinforcing agent consists of floating beads, silica fume, ground slag powder and alkali excitant, and the average grain size is less than 5 microns.
In the invention, the viscosity reduction reinforcing agent contains abundant active mineral components such as floating beads, silica fume, slag powder and the like, so that the strength of concrete can be improved, the average grain diameter of the viscosity reduction reinforcing agent is less than 5 mu m, a certain 'micro aggregate' filling effect can be exerted to have a certain improving effect on the strength and slump of the concrete, in addition, the viscosity reduction effect can reduce the viscosity of the concrete, the slump of the concrete is improved, when the mixing amount of the viscosity reduction reinforcing agent is 2.96-3.79%, the slump and strength of the concrete can be obviously improved, and the slump and strength of the concrete can meet engineering requirements.
Further, the comparative area of the superfine heavy calcium powder is more than 1200m 2 The water demand ratio is less than 90 percent, and the 28d activity index is more than 110 percent.
In the invention, the filling effect of the micro aggregate of the superfine heavy calcium powder has a certain improving effect on the slump and the strength of the concrete, the crystal nucleus effect is beneficial to the further improvement of the strength of the concrete, and the synergistic effect is generated by the lamination effect of the crystal nucleus effect and the viscosity-reducing reinforcing agent, so that the effect of 1+1 & gt2 can be exerted; however, when the mixing amount of the superfine heavy calcium powder is too high, the bleeding rate of concrete is increased, the slump is reduced, and when the mixing amount of the superfine heavy calcium powder is 2.96-3.79%, the concrete strength and the slump are improved to a certain extent, and the bleeding rate is not increased.
Further, the high mud content machine-made sand is limestone machine-made sand, the fineness modulus is 3.0, the stone powder content is 10%, and the MB value is 5.
In the existing sand standard for construction, the MB value is used for representing the mud-containing condition of concrete, the higher the MB value is, the higher the mud content is, the higher the content of adsorptive clay is, and the adsorptive clay contains a large amount of high-valence metal ions and has an adsorption effect on the polycarboxylic acid water reducer, so that the actual water reducing effect of the polycarboxylic acid water reducer is affected, and meanwhile, the adsorptive clay also absorbs water to expand, so that the slump of the concrete is reduced.
Therefore, in the existing preparation process of concrete, machine-made sand with high MB value cannot be directly used, and a large amount of water is needed to wash the machine-made sand with high MB value for multiple times, but in the invention, the machine-made sand with MB value of 5 can be directly used for preparing the concrete, and meanwhile, the bleeding property and slump retention property of the concrete are ensured.
Further, the broken stone is limestone broken stone, the void ratio of the broken stone is less than or equal to 42%, the total content of the needle-shaped particles is less than or equal to 5%, and the mud content is less than 1.0%.
Further, the content of effective substances in the sodium hexametaphosphate is more than or equal to 99 percent.
The water is an essential component for hydration reaction of the cementing material in the concrete, and is an essential component for generating good slump of the concrete, and a proper amount of water can ensure that the cementing material component in the concrete is sufficiently hydrated and the slump necessary for concrete construction can be ensured, and the excessive mixing amount of water can cause the strength reduction of the concrete and cause bleeding, segregation and other workability problems.
Therefore, in the invention, the complexation of sodium hexametaphosphate is adopted to reduce the high-valence metal ions in the machine-made sand with high mud content, and the adsorption of the high-valence metal ions on the polycarboxylic acid water reducer is reduced; the mixing amount of water in the concrete is 5.5 to 5.73 percent, the slump and the strength of the concrete meet the requirements, the workability of the concrete mixture is good, and obvious bleeding, segregation and other workability problems do not occur.
Meanwhile, the sodium hexametaphosphate has a certain retarding effect, can delay the hydration heat release quantity of cement, inhibit the loss of concrete slump with time, and is favorable for maintaining the concrete slump.
Further, the polyquaternium is bisdodecyl dimethyl-gamma-bisquaternium.
The polyquaternary ammonium salt is a strong cationic high molecular polymer, has good solubility in water, can effectively control the water expansion of clay particles in water, and reduces the concrete slump reduction caused by the absorption of the clay particles to water molecules, so that the invention adopts the polyquaternary ammonium salt and sodium hexametaphosphate to compound and use, and effectively avoids the problem of failure of the water reducing effect of the polycarboxylate water reducer caused by high mud content in machine-made sand. Wherein, the didodecyl dimethyl-gamma-biquaternary ammonium salt has stronger effect of inhibiting the expansion of clay particles.
The anti-mud type polycarboxylic acid high-performance water reducer is an amphoteric polycarboxylic acid high-performance water reducer, and the water reducing rate is more than or equal to 35%.
The second purpose of the invention is to provide a preparation method of the C60 high-mud-content machine-made sand large-flow concrete, which has the same effect.
The invention provides a preparation method of C60 high-mud-content machine-made sand large-flow concrete, which comprises the following operation steps:
s1, adding crushed stone, sand and a part of mixing water into a forced mixer in sequence, stirring for 60 seconds, and then adding cement, a viscosity reduction enhancer and superfine heavy calcium powder into the forced mixer in sequence, and stirring for 30 seconds;
s2, respectively adding the rest water, sodium hexametaphosphate, polyquaternium and the anti-mud type polycarboxylic acid high-performance water reducer into a forced mixer for continuous stirring for 60 seconds, and uniformly mixing and stirring the raw materials to obtain the concrete.
Further, the mass M of the mixing water in step S1 and the mass M of the remaining water in step S2 are calculated by the following calculation model:
wherein n is 1 Is added into sodium hexametaphosphate in percentage by mass, n 2 The water reducing agent is prepared from the following components in percentage by mass, wherein N is the additive percentage by mass of the anti-mud type polycarboxylic acid high-performance water reducing agent, and W is the water reducing rate of the polycarboxylic acid water reducing agent; wherein 1.25 is obtained by converting the value of MB into the mass of mud according to the present invention.
The water is an essential component for hydration reaction of the cementing material in the concrete, and is an essential component for generating good slump of the concrete, a proper amount of water can ensure that the cementing material component in the concrete is sufficiently hydrated and the slump necessary for concrete construction can be ensured, the excessive mixing amount of the water can lead to the reduction of the strength of the concrete, bleeding, segregation and other workability problems, by adopting the method, the water consumption is accurately calculated, and the mixing amount of the water in the concrete can improve the concrete mixture workability while improving the slump and the strength fullness of the concrete.
In summary, the invention has the following beneficial effects:
(1) The viscosity reducing reinforcing agent and the superfine heavy calcium powder are compounded for use, and the cement particles are subjected to good micro-grading filling by utilizing the superfine powder particles with two different particle sizes, so that the slump and the compactness of the concrete are improved, and the strength and the durability of the concrete are greatly improved. Meanwhile, the pozzolan effect of the aggregate and the cementing material is fully exerted, the surrounding performance of the slurry interface of the aggregate and the cementing material is optimized, the binding force between the aggregate and the cementing material is improved, and the strength of concrete is further improved. Meanwhile, the microstructure of slurry cement is optimized, the microstructure of slurry is improved, the durability of concrete is improved, and the degradation effect of high-mud content machine-made sand on concrete slump, strength and durability is further weakened.
(2) The sodium hexametaphosphate has the dual effects of mud resistance and retarding, can delay the hydration heat release rate of cement on the basis of inhibiting the adsorption of clay particles to the water reducer and the absorption of water, can improve the slump of concrete mixture, and can reduce the slump loss of concrete. The amphoteric polycarboxylic acid high-performance water reducer has dual effects of water reduction and mud resistance, can fully exert the mud resistance effect under the condition of high mud content of machine-made sand, reduces the adsorption of clay particles to the water reducer, fully exerts good water reduction effect, and ensures large flow state and large slump of the high mud content machine-made sand concrete. The feeding sequence can ensure that the clay particles in the high-mud-content machine-made sand preferentially adsorb part of mixing water, reduce the adsorption of the clay particles on the water reducer, and is favorable for improving the slump of concrete.
(3) The C60 high-mud-content machine-made sand large-flow concrete provided by the invention can still obtain the advantages of good slump and workability and strength meeting the requirements under the condition of adopting the high-mud-content machine-made sand. On the premise of meeting the basic engineering demands, the problems that the high-mud-content machine-made sand has small slump, low strength and poor durability and cannot be used for preparing and producing C60 concrete are solved, and the slump, 28d compressive strength and electric flux of the C60 high-mud-content machine-made sand large-flow concrete are close to or even superior to those of concrete with the same strength grade, so that the concrete can be used for practical engineering.
Detailed Description
In order to further explain the technical means and the effects adopted by the invention to achieve the preset aim, the invention provides the C60 high-mud-content machine-made sand large-flow concrete and the preparation method thereof, and the concrete implementation modes, the characteristics and the effects thereof are detailed below.
52.5 Portland cement: purchased from Guangdong Taisui mud (Ind.) Cement Co., ltd;
viscosity reducing enhancer and superfine heavy calcium powder: purchased from construction and research materials limited company;
high mud machine-made sand and crushed stone: purchase in Guangdong bergamot certain stone factory;
river sand: purchasing from a certain sand factory in Hunan;
class I fly ash: purchased from Guangdong Yangxi electric power plant;
polyquaternium and sodium hexametaphosphate: purchased from construction and research materials limited company;
ordinary polycarboxylic acid high-performance water reducer and mud-resistant polycarboxylic acid high-performance water reducer: purchased from construction and research materials limited.
Example 1
The dosage of each side of the C60 high-mud-content machine-made sand large-flow-state concrete provided by the embodiment is 2480kg, and the concrete comprises the following components in detail: 392kg of 52.5-grade early-strength Portland cement, 49kg of viscosity-reducing reinforcing agent, 49kg of superfine heavy calcium powder, 702.043kg of high-mud-content machine-made sand, 1145.376kg of crushed stone, 0.049kg of sodium hexametaphosphate, 0.049kg of polyquaternary ammonium salt, 0.392kg of anti-mud type polycarboxylic acid high-performance water reducer and 142kg of water.
Wherein, the 52.5-grade silicate cement is compounded with the standard requirement of general silicate cement; the fineness modulus of the machine-made sand is 3.0, the stone powder content is 10%, the MB value is 5, and other performances meet the standard requirements of construction sand. The average grain diameter of the viscosity reducing enhancer is less than 5 mu m, the water demand ratio is less than or equal to 85%, and the 28d activity index is more than 110%. The specific surface area of the superfine heavy calcium powder is more than 1200m 2 Ratio of water demand per kg<90%,28d activity index greater than 110%. The broken stone meets the requirements of the current standard 'pebble for construction' (GB/T14685) on class I broken stone, the void ratio is less than or equal to 42%, the total content of needle-shaped particles is less than or equal to 5%, and the mud content is less than or equal to 0.5%. The polyquaternium is bisdodecyl dimethyl-gamma-bisquaternium. The mud-resistant polycarboxylic acid high-performance water reducer has a water reducing rate of more than or equal to 35% and a shrinkage rate of less than or equal to 100% in 28 d.
The preparation method comprises the following steps:
s1, adding crushed stone, sand and 50% of mixing water into a forced mixer in sequence, stirring for 60 seconds, and then adding cement, a viscosity reduction enhancer and superfine heavy calcium powder into the forced mixer in sequence, and stirring for 30 seconds;
s2, respectively adding the rest 50% of water, sodium hexametaphosphate, polyquaternium and the anti-mud type polycarboxylic acid high-performance water reducer into a forced mixer for continuous stirring for 60 seconds, and uniformly mixing and stirring the raw materials to obtain the concrete.
Example 2
The dosage of each side of the C60 high-mud-content machine-made sand large-flow-state concrete provided by the embodiment is 2480kg, and the concrete comprises the following components in detail: 343kg of 52.5-grade Portland cement, 73.5kg of viscosity reducing reinforcing agent, 73.5kg of superfine heavy calcium powder, 702.043kg of high mud-content machine-made sand, 1145.376kg of sandstone macadam, 0.049kg of sodium hexametaphosphate, 0.049kg of polyquaternary ammonium salt, 0.392g of mud-resistant polycarboxylic acid high-performance water reducer and 142kg of water.
Wherein, the 52.5-grade silicate cement is compounded with the standard requirement of general silicate cement; the fineness modulus of the machine-made sand is 3.0, the stone powder content is 10%, the MB value is 5, and other performances meet the standard requirements of construction sand. The average grain diameter of the viscosity reducing enhancer is less than 5 mu m, the water demand ratio is less than or equal to 85%, and the 28d activity index is more than 110%. The specific surface area of the superfine heavy calcium powder is more than 1200m 2 Ratio of water demand per kg<90%,28d activity index greater than 110%. The broken stone meets the requirements of the current standard 'pebble for construction' (GB/T14685) on class I broken stone, the void ratio is less than or equal to 42%, the total content of needle-shaped particles is less than or equal to 5%, and the mud content is less than or equal to 0.5%. The polyquaternium is bisdodecyl dimethyl-gamma-bisquaternium. The mud-resistant polycarboxylic acid high-performance water reducer has a water reducing rate of more than or equal to 35% and a shrinkage rate of less than or equal to 100% in 28 d.
The preparation method comprises the following steps:
s1, adding crushed stone, sand and 50% of mixing water into a forced mixer in sequence, stirring for 60 seconds, and then adding cement, a viscosity reduction enhancer and superfine heavy calcium powder into the forced mixer in sequence, and stirring for 30 seconds;
s2, respectively adding the rest 50% of water, sodium hexametaphosphate, polyquaternium and the anti-mud type polycarboxylic acid high-performance water reducer into a forced mixer for continuous stirring for 60 seconds, and uniformly mixing and stirring the raw materials to obtain the concrete.
Example 3
The dosage of each side of the C60 high-mud-content machine-made sand large-flow-state concrete provided by the embodiment is 2480kg, and the concrete comprises the following components in detail: 343kg of 52.5-grade Portland cement, 73.5kg of viscosity reducing reinforcing agent, 73.5kg of superfine heavy calcium powder, 701.885kg of high mud-content machine-made sand, 1144.937kg of crushed stone, 0.245kg of sodium hexametaphosphate, 0.245kg of polyquaternary ammonium salt, 0.588g of anti-mud type polycarboxylic acid high-performance water reducing agent and 142kg of water.
Wherein, the 52.5-grade silicate cement is compounded with the standard requirement of general silicate cement; the fineness modulus of the machine-made sand is 3.0, the stone powder content is 10%, the MB value is 5, and other performances meet the standard requirements of construction sand. The average grain diameter of the viscosity reducing enhancer is less than 5 mu m, the water demand ratio is less than or equal to 85%, and the 28d activity index is more than 110%. The specific surface area of the superfine heavy calcium powder is more than 1200m 2 Ratio of water demand per kg<90%,28d activity index greater than 110%. The broken stone meets the requirements of the current standard 'pebble for construction' (GB/T14685) on class I broken stone, the void ratio is less than or equal to 42%, the total content of needle-shaped particles is less than or equal to 5%, and the mud content is less than or equal to 0.5%. The polyquaternium is bisdodecyl dimethyl-gamma-bisquaternium. The mud-resistant polycarboxylic acid high-performance water reducer has a water reducing rate of more than or equal to 35% and a shrinkage rate of less than or equal to 100% in 28 d.
The preparation method comprises the following steps:
s1, adding crushed stone, sand and 50% of mixing water into a forced mixer in sequence, stirring for 60 seconds, and then adding cement, a viscosity reduction enhancer and superfine heavy calcium powder into the forced mixer in sequence, and stirring for 30 seconds;
s2, respectively adding the rest 50% of water, sodium hexametaphosphate, polyquaternium and the anti-mud type polycarboxylic acid high-performance water reducer into a forced mixer for continuous stirring for 60 seconds, and uniformly mixing and stirring the raw materials to obtain the concrete.
Example 4
The dosage of each side of the C60 high-mud-content machine-made sand large-flow-state concrete provided by the embodiment is 2480kg, and the concrete comprises the following components in detail: 282kg of 52.5-grade Portland cement, 94kg of viscosity reducing reinforcing agent, 94kg of superfine heavy calcium powder, 711.649kg of high mud-content machine-made sand, 1160.876kg of crushed stone, 0.235kg of sodium hexametaphosphate, 0.235kg of polyquaternary ammonium salt, 0.705g of mud-resistant polycarboxylic acid high-performance water reducer and 136kg of water.
Wherein, the 52.5-grade silicate cement is compounded with the standard requirement of general silicate cement; the fineness modulus of the machine-made sand is 3.0, the stone powder content is 10%, the MB value is 5, and other performances meet the standard requirements of construction sand. Viscosity reduction and increaseThe average grain diameter of the strengthening agent is less than 5 mu m, the water demand ratio is less than or equal to 85%, and the 28d activity index is more than 110%. The specific surface area of the superfine heavy calcium powder is more than 1200m 2 Ratio of water demand per kg<90%,28d activity index greater than 110%. The broken stone meets the requirements of the current standard 'pebble for construction' (GB/T14685) on class I broken stone, the void ratio is less than or equal to 42%, the total content of needle-shaped particles is less than or equal to 5%, and the mud content is less than or equal to 0.5%. The polyquaternium is bisdodecyl dimethyl-gamma-bisquaternium. The mud-resistant polycarboxylic acid high-performance water reducer has a water reducing rate of more than or equal to 35% and a shrinkage rate of less than or equal to 100% in 28 d.
The preparation method comprises the following steps:
s1, adding crushed stone, sand and 50% of mixing water into a forced mixer in sequence, stirring for 60 seconds, and then adding cement, a viscosity reduction enhancer and superfine heavy calcium powder into the forced mixer in sequence, and stirring for 30 seconds;
s2, respectively adding the rest 50% of water, sodium hexametaphosphate, polyquaternium and the anti-mud type polycarboxylic acid high-performance water reducer into a forced mixer for continuous stirring for 60 seconds, and uniformly mixing and stirring the raw materials to obtain the concrete.
Example 5
The dosage of each side of the C60 high-mud-content machine-made sand large-flow-state concrete provided by the embodiment is 2480kg, and the concrete comprises the following components in detail: 52.5 grade Portland cement 282kg, S105 grade fine blast furnace slag powder 94kg, burnt superfine fly ash 94kg, high mud-containing machine-made sand 711.5kg, sandstone macadam 1160.64kg, sodium hexametaphosphate 0.326kg, polyquaternium 0.326kg, anti-mud type polycarboxylic acid high performance water reducer 0.846g and water 136kg.
Wherein, the 52.5-grade silicate cement is compounded with the standard requirement of general silicate cement; the fineness modulus of the machine-made sand is 3.0, the stone powder content is 10%, the MB value is 5, and other performances meet the standard requirements of construction sand. The average grain diameter of the viscosity reducing enhancer is less than 5 mu m, the water demand ratio is less than or equal to 85%, and the 28d activity index is more than 110%. The specific surface area of the superfine heavy calcium powder is more than 1200m 2 Ratio of water demand per kg<90%,28d activity index greater than 110%. The broken stone meets the requirement of the current standard of pebble for construction and broken stone (GB/T14685) on class I broken stone, the void ratio is less than or equal to 42 percent, and the broken stone is in the shape of a needleThe total content of particles is less than or equal to 5 percent, and the mud content is less than or equal to 0.5 percent. The polyquaternium is bisdodecyl dimethyl-gamma-bisquaternium. The mud-resistant polycarboxylic acid high-performance water reducer has a water reducing rate of more than or equal to 35% and a shrinkage rate of less than or equal to 100% in 28 d.
The preparation method comprises the following steps:
s1, adding crushed stone, sand and 50% of mixing water into a forced mixer in sequence, stirring for 60 seconds, and then adding cement, a viscosity reduction enhancer and superfine heavy calcium powder into the forced mixer in sequence, and stirring for 30 seconds;
s2, respectively adding the rest 50% of water, sodium hexametaphosphate, polyquaternium and the anti-mud type polycarboxylic acid high-performance water reducer into a forced mixer for continuous stirring for 60 seconds, and uniformly mixing and stirring the raw materials to obtain the concrete.
Example 6
The dosage of each side of the C60 high-mud-content machine-made sand large-flow-state concrete provided by the embodiment is 2480kg, and the concrete comprises the following components in detail: 52.5 grade Portland cement 282kg, S105 grade fine blast furnace slag powder 94kg, burnt superfine fly ash 94kg, high mud-containing machine-made sand 711.5kg, sandstone macadam 1160.64kg, sodium hexametaphosphate 0.326kg, polyquaternium 0.326kg, anti-mud type polycarboxylic acid high performance water reducer 0.846g and water 136kg.
Wherein, the 52.5-grade silicate cement is compounded with the standard requirement of general silicate cement; the fineness modulus of the machine-made sand is 3.0, the stone powder content is 10%, the MB value is 5, and other performances meet the standard requirements of construction sand. The average grain diameter of the viscosity reducing enhancer is less than 5 mu m, the water demand ratio is less than or equal to 85%, and the 28d activity index is more than 110%. The specific surface area of the superfine heavy calcium powder is more than 1200m 2 Ratio of water demand per kg<90%,28d activity index greater than 110%. The broken stone meets the requirements of the current standard 'pebble for construction' (GB/T14685) on class I broken stone, the void ratio is less than or equal to 42%, the total content of needle-shaped particles is less than or equal to 5%, and the mud content is less than or equal to 0.5%. The polyquaternium is bisdodecyl dimethyl-gamma-bisquaternium. The mud-resistant polycarboxylic acid high-performance water reducer has a water reducing rate of more than or equal to 35% and a shrinkage rate of less than or equal to 100% in 28 d.
The preparation method comprises the following steps:
s1, adding crushed stone, sand and 42% of mixing water into a forced stirrer in sequence, stirring for 60 seconds, and then adding cement, a viscosity reduction enhancer and superfine heavy calcium powder into the forced stirrer in sequence, and stirring for 30 seconds;
s2, respectively adding the rest 58% of water, sodium hexametaphosphate, polyquaternium and the anti-mud type polycarboxylic acid high-performance water reducer into a forced mixer for continuous stirring for 60 seconds, and uniformly mixing and stirring the raw materials to obtain the concrete.
The ratio of the water consumption in the step S1 to the step S2 is calculated according to the following formula:
wherein n is 1 Is added into sodium hexametaphosphate in percentage by mass, n 2 The water reducing agent is prepared from the following components in percentage by mass, wherein N is the percentage by mass of the addition of the anti-mud type polycarboxylic acid high-performance water reducing agent, and W is the water reducing rate of the polycarboxylic acid water reducing agent; wherein 1.25 is obtained by converting the value of MB into the mass of mud according to the present invention.
Comparative example 1
The dosage of each side of the C60 river sand large flow state concrete provided by the comparative example is 2480kg, and the concrete specifically comprises the following components: 52.5 grade Portland cement 3992 kg, I grade fly ash 98kg, river sand 702.053kg, crushed stone 1145.455kg, common polycarboxylic acid high performance water reducer 0.392g and water 142kg.
Wherein, the 52.5-grade silicate cement is compounded with the standard requirement of general silicate cement; the river sand meets the standard requirement of construction sand, the fineness modulus is 2.8, and the mud content is less than 0.5%.
The preparation method comprises the following steps:
s1, sequentially adding crushed stone, river sand, silicate cement and fly ash with the mass into a forced stirrer, and stirring for 30 seconds;
s2, respectively adding the water with the mass and the polycarboxylic acid high-performance water reducer into a forced mixer, and continuously stirring for 120 seconds to uniformly mix and stir the raw materials to prepare the concrete.
Comparative example 2
The dosage of each side of the C60 high mud machine-made sand concrete provided by the embodiment is 2480kg, and the concrete comprises the following components: 52.5 grade Portland cement 3992 kg, I grade fly ash 98kg, machine sand 702.053g, crushed stone 1145.45kg, polycarboxylic acid high performance water reducer 0.392g and water 142kg.
Wherein, the 52.5-grade silicate cement is compounded with the standard requirement of general silicate cement; the fineness modulus of the machine-made sand is 3.0, the stone powder content is 10%, the MB value is 5, and other performances meet the standard requirements of construction sand.
The preparation method comprises the following steps:
s1, sequentially adding crushed stone, machine-made sand, silicate cement and fly ash with the mass into a forced stirrer, and stirring for 30 seconds;
s2, respectively adding the water with the mass and the polycarboxylic acid high-performance water reducer into a forced mixer, and continuously stirring for 120 seconds to uniformly mix and stir the raw materials to prepare the concrete.
Performance test:
the slump (0 h, 1 h), bleeding rate, compressive strength, shrinkage and electric flux of the concrete of the finished products of examples 1 to 6 and comparative examples 1 to 2 after the test molding were measured, wherein the slump and bleeding rate test methods were conducted with reference to the current standard "ordinary concrete mix Performance test method Standard (GB/T50080), the compressive strength test methods were conducted with reference to the current standard" concrete physical mechanical Property test method Standard (GB/T50081), the electric flux test methods were conducted with reference to the current standard "ordinary concrete Long-term Performance and durability test method Standard (GB/T50082), and the detailed test results are shown in Table 1:
TABLE 1 Performance test data for the concretes of examples 1-6 and comparative examples 1-2
According to the design and construction requirements of large-flow concrete, the initial slump of C60 concrete is 220-240 mm, the 1h slump is not less than 180mm, and the 28d compressive strength is not less than 69MPa. In contrast to this requirement, the slump and strength of comparative example 1 using high mud machine-made sand did not meet the requirement, and the slump and strength of comparative example 2 using river sand and inventive examples 1 to 6 meet the requirement. Compared with comparative example 1 using river sand, the slump, strength and electricity of the invention examples 1-6 are slightly lower, the bleeding rate is the same, and the overall performance is improved, which fully demonstrates that the invention can prepare large-flow concrete with slump, strength, bleeding rate, electric flux and other performances comparable to river sand by using high-mud-content machine-made sand.
According to the invention, through optimizing key mix proportion parameters, optimizing special functional materials, additives and the like, the C60 high-mud-content machine-made sand concrete has the advantages of good slump, high compressive strength and low electric flux, can ensure the construction performance and strength requirements of the concrete, and can be used for actual engineering construction.
Specifically, the concrete compound viscosity reducing reinforcing agent, superfine heavy calcium powder and other functional powder materials provided by the invention can exert the micro-grading effect of the functional powder materials to increase the compactness of the concrete structure, reduce the porosity and improve the strength and the durability; the pozzolan effect of a part of components in the viscosity-reducing reinforcing agent and the crystal nucleus effect of the superfine heavy calcium powder and the superposition effect of the two components further improve the concrete slurry and the micro-morphology of the interface between the concrete slurry and the aggregate, increase the compactness of the slurry and the interface binding force between the slurry and the aggregate, and further improve the strength and the durability of the concrete.
The sodium hexametaphosphate selected by the invention can simultaneously deliver the dual effects of mud resistance and delayed coagulation, and can delay the hydration heat release rate of cement, improve the slump of concrete and reduce the slump loss of concrete on the basis of inhibiting the adsorption of clay particles to the water reducer and the absorption of water.
The polyquaternary ammonium salt selected by the invention can effectively control the water absorption expansion of clay particles in water, inhibit the adsorption of the clay particles to the polycarboxylate superplasticizer, and simultaneously, the flocculation effect of the polyquaternary ammonium salt can ensure that undispersed clay particles are gathered to avoid the contact between the clay particles and water molecules as well as the polycarboxylate superplasticizer, reduce the adsorption of the clay particles to the water molecules and the polycarboxylate superplasticizer, and improve the slump of concrete.
The mud-resistant water reducer system high-performance water reducer selected by the invention has the dual effects of water reduction and mud resistance, can fully exert the mud resistance effect under the condition of high mud content of machine-made sand, reduces the adsorption of clay particles to the water reducer, fully exerts good water reduction effect, and ensures the large flow state and large slump of the high mud-containing machine-made sand concrete.
According to the preparation and feeding sequence of the concrete, the water for mixing is mixed in the clay particles in the high-mud-content machine-made sand by virtue of the preferential adsorption part, so that the adsorption of the clay particles on the water reducer is reduced, and the slump of the concrete is improved.
The present invention is not limited to the above-mentioned embodiments, but is not limited to the above-mentioned embodiments, and any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical matters of the present invention can be made by those skilled in the art without departing from the scope of the present invention.
Claims (8)
1. The C60 high-mud-content machine-made sand large-flow-state concrete is characterized by comprising the following components in percentage by mass: 11.37-13.83% of Portland cement, 2.96-3.79% of viscosity reducing reinforcing agent, 2.96-3.79% of superfine heavy calcium powder, 28.31-28.69% of high-mud-content machine-made sand, 46.17-46.68% of crushed stone, 5.5-5.73% of water, 0.002-0.013% of sodium hexametaphosphate, 0.002-0.013% of polyquaternary ammonium salt and 0.016-0.034% of anti-mud type polycarboxylic acid high-performance water reducer;
the preparation method of the C60 high-mud-content machine-made sand large-flow-state concrete comprises the following operation steps:
s1, adding crushed stone, sand and a part of mixing water into a forced mixer in sequence, stirring for 60 seconds, and then adding cement, a viscosity reduction enhancer and superfine heavy calcium powder into the forced mixer in sequence, and stirring for 30 seconds;
s2, respectively adding the rest water, sodium hexametaphosphate, polyquaternium and the anti-mud type polycarboxylic acid high-performance water reducer into a forced mixer for continuous stirring for 60 seconds, so that the raw materials are uniformly mixed and stirred to prepare concrete;
wherein the mass M of the mixing water in step S1 and the mass M of the remaining water in step S2 are calculated by the following calculation model:
；
wherein n is 1 Is added into sodium hexametaphosphate in percentage by mass, n 2 The water reducing agent is prepared from the following components in percentage by mass, wherein N is the additive percentage by mass of the anti-mud type polycarboxylic acid high-performance water reducing agent, and W is the water reducing rate of the polycarboxylic acid water reducing agent;
the viscosity-reducing reinforcing agent consists of floating beads, silica fume, ground slag powder and alkali excitant, and the average grain diameter is less than 5 mu m.
2. The C60 high mud machine-made sand large flow state concrete of claim 1, wherein the portland cement is early strength 52.5 grade ordinary portland cement.
3. The C60 high mud machine-made sand large flow state concrete according to claim 1, wherein the comparison area of the superfine heavy calcium powder is more than 1200m 2 The water demand ratio is less than 90 percent, and the 28d activity index is more than 110 percent.
4. The C60 high mud machine-made sand large flow state concrete according to claim 1, wherein the high mud machine-made sand is limestone machine-made sand, the fineness modulus is 3.0, the stone powder content is 10%, and the MB value is 5.
5. The C60 high-mud machine-made sand large-flow-state concrete according to claim 1, wherein the broken stone is limestone broken stone, the void ratio of the broken stone is less than or equal to 42%, the total content of needle-shaped particles is less than or equal to 5%, and the mud content is less than 1.0%.
6. The C60 high-mud-content machine-made sand large-flow-state concrete according to claim 1, wherein the content of effective substances in sodium hexametaphosphate is more than or equal to 99%.
7. The C60 high mud machine-made sand heavy flow concrete of claim 1, wherein the polyquaternium is a bisdodecyl dimethyl-gamma-bisquaternium.
8. The C60 high mud machine-made sand large flow state concrete according to claim 1, wherein the anti-mud type polycarboxylic acid high performance water reducer is an amphoteric polycarboxylic acid high performance water reducer, and the water reducing rate is more than or equal to 35%.
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| CN112723834A (en) * | 2021-01-28 | 2021-04-30 | 山东港湾建设集团有限公司 | Sea sand interlocking block for port storage yard and preparation method thereof |
| CN114105553A (en) * | 2021-11-01 | 2022-03-01 | 江西省交通工程集团有限公司 | Large-flow-state high-dispersibility cast-in-place pile concrete containing machine-made sand dust-collecting stone powder |
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| CN112723834A (en) * | 2021-01-28 | 2021-04-30 | 山东港湾建设集团有限公司 | Sea sand interlocking block for port storage yard and preparation method thereof |
| CN114105553A (en) * | 2021-11-01 | 2022-03-01 | 江西省交通工程集团有限公司 | Large-flow-state high-dispersibility cast-in-place pile concrete containing machine-made sand dust-collecting stone powder |
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