CN116813260B - Super-retarding anti-cracking concrete and preparation method thereof - Google Patents
Super-retarding anti-cracking concrete and preparation method thereof Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 160
- 238000005336 cracking Methods 0.000 title claims abstract description 117
- 238000002360 preparation method Methods 0.000 title abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 110
- 230000000979 retarding effect Effects 0.000 claims abstract description 63
- 230000001603 reducing effect Effects 0.000 claims abstract description 39
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 33
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 28
- 239000004575 stone Substances 0.000 claims abstract description 21
- 239000000835 fiber Substances 0.000 claims abstract description 18
- 239000004576 sand Substances 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 17
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 claims abstract description 16
- 229920002472 Starch Polymers 0.000 claims abstract description 16
- 235000019698 starch Nutrition 0.000 claims abstract description 16
- 239000008107 starch Substances 0.000 claims abstract description 16
- RFVNOJDQRGSOEL-UHFFFAOYSA-N 2-hydroxyethyl octadecanoate Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCCO RFVNOJDQRGSOEL-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 15
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 15
- 239000011707 mineral Substances 0.000 claims abstract description 15
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 15
- 239000004568 cement Substances 0.000 claims abstract description 14
- 239000010881 fly ash Substances 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 239000000203 mixture Substances 0.000 claims abstract description 4
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 24
- OOCMUZJPDXYRFD-UHFFFAOYSA-L calcium;2-dodecylbenzenesulfonate Chemical compound [Ca+2].CCCCCCCCCCCCC1=CC=CC=C1S([O-])(=O)=O.CCCCCCCCCCCCC1=CC=CC=C1S([O-])(=O)=O OOCMUZJPDXYRFD-UHFFFAOYSA-L 0.000 claims description 17
- 239000011259 mixed solution Substances 0.000 claims description 16
- ZCPCLAPUXMZUCD-UHFFFAOYSA-M dihexadecyl(dimethyl)azanium;chloride Chemical compound [Cl-].CCCCCCCCCCCCCCCC[N+](C)(C)CCCCCCCCCCCCCCCC ZCPCLAPUXMZUCD-UHFFFAOYSA-M 0.000 claims description 15
- 239000003292 glue Substances 0.000 claims description 11
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 9
- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 claims description 9
- 229930006000 Sucrose Natural products 0.000 claims description 9
- 239000004917 carbon fiber Substances 0.000 claims description 9
- 229920005646 polycarboxylate Polymers 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 10
- 238000004904 shortening Methods 0.000 abstract 1
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- 230000036571 hydration Effects 0.000 description 15
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- 230000007797 corrosion Effects 0.000 description 14
- 230000003111 delayed effect Effects 0.000 description 12
- 230000015271 coagulation Effects 0.000 description 11
- 238000005345 coagulation Methods 0.000 description 11
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 6
- 239000011575 calcium Substances 0.000 description 5
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- 230000000740 bleeding effect Effects 0.000 description 4
- 229910052791 calcium Inorganic materials 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
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- 230000003628 erosive effect Effects 0.000 description 3
- 239000003673 groundwater Substances 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 238000007712 rapid solidification Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004574 high-performance concrete Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
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- IQDGSYLLQPDQDV-UHFFFAOYSA-N dimethylazanium;chloride Chemical compound Cl.CNC IQDGSYLLQPDQDV-UHFFFAOYSA-N 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 238000007676 flexural strength test Methods 0.000 description 1
- 239000000499 gel Substances 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
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/27—Water resistance, i.e. waterproof or water-repellent 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
Abstract
The invention relates to the technical field of concrete, and particularly discloses super-retarding anti-cracking concrete and a preparation method thereof. The super-retarding anti-cracking concrete comprises 220-260 parts of cement, 40-60 parts of fly ash, 30-40 parts of mineral powder, 800-840 parts of machine-made sand, 950-1020 parts of stone, 3-4 parts of fiber, 8.5-9.8 parts of water reducer, 6.7-8.2 parts of retarder, 6.1-7.4 parts of retarding and water reducing auxiliary agent and 100-120 parts of water; wherein the retarding and water reducing auxiliary agent is a mixture of acetate starch, hotplate rubber and polyethylene glycol monostearate. The preparation method of the super-retarding anti-cracking concrete comprises the steps of mixing and uniformly stirring all the raw materials. The method has the effects of obviously shortening the time interval between initial setting and final setting of the super-retarding anti-cracking concrete and improving the durability of the super-retarding anti-cracking concrete.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to super-retarding anti-cracking concrete and a preparation method thereof.
Background
With the rapid development of the Chinese capital construction, the requirements for the construction of the building are increasing, and the concrete is gradually developed towards high-performance concrete as one of the important components of the building. Super-retarding concrete, which is one of high-performance concrete, is widely used in pile foundation engineering projects.
The pile foundation is mainly used as a foundation of various houses and bridges, the Chinese geographic environment is complex, and the construction environment of the pile foundation is complex and changeable. In the coastal river-along areas with abundant groundwater and other parts, because the stratum structure is complex, in order to ensure that pile foundations can be connected to hard soil layers, extra-long pile foundations with the length of more than 70m are required to be driven into the ground, the concrete pouring time is long during construction, a double-sleeve technology is generally adopted, and the sleeve is pulled up while pouring during concrete pouring. The pile foundation part structure is positioned under water and is continuously flushed by underground water flow, and if the super-retarding concrete used for pouring the pile foundation does not have good durability, the pile foundation is eroded by the underground water. The underground water contains abundant mineral substances, the pile foundation is soaked in the underground water for a long time, the underground water is easy to permeate into the pile foundation, the internal structure of the pile foundation is corroded, the stability of the pile foundation is reduced, and the damage such as the reduction of the stability of the integral structure of a building and the deformation of the structure of the building can be possibly caused.
Aiming at the related technology, the inventor considers that the durability of the super-retarding concrete is necessary to be further improved, the pile foundation poured by the super-retarding concrete is further ensured to be capable of effectively avoiding or reducing the harm caused by groundwater corrosion, and the quality and the safety of a building are ensured.
Disclosure of Invention
In order to further improve the durability of the super-retarding concrete, the application provides the super-retarding anti-cracking concrete and a preparation method thereof. According to the method, the retarding water reducing auxiliary agent prepared from the acetate starch, the temperature wheel glue and the polyethylene glycol monostearate is doped into the super retarding anti-cracking concrete, and the good water locking property of the retarding water reducing auxiliary agent is used, so that the plastic shrinkage cracks caused by bleeding of the surface of the super retarding anti-cracking concrete and internal water loss are avoided, the sufficient hydration of the super retarding anti-cracking concrete is ensured, the compactness of the super retarding anti-cracking concrete is further improved, the moisture infiltration into the super retarding anti-cracking concrete is avoided, and the durability of the super retarding anti-cracking concrete is further improved.
In a first aspect, the present application provides an ultra-retarding anti-cracking concrete, which adopts the following technical scheme:
an ultra-retarding anti-cracking concrete comprises the following raw materials in parts by weight: 220 to 260 parts of cement, 40 to 60 parts of fly ash, 30 to 40 parts of mineral powder, 800 to 840 parts of machine-made sand, 950 to 1020 parts of stone, 3 to 4 parts of fiber, 8.5 to 9.8 parts of water reducer, 6.7 to 8.2 parts of retarder, 6.1 to 7.4 parts of retarding and water reducing auxiliary agent and 100 to 120 parts of water;
wherein the retarding and water reducing auxiliary agent is a mixture of acetate starch, hotplate rubber and polyethylene glycol monostearate.
According to the technical scheme, the retarding water reducing auxiliary agent prepared from the acetate starch, the temperature wheel glue and the polyethylene glycol monostearate is doped into the super retarding anti-cracking concrete, so that on one hand, the retarding water reducing auxiliary agent has water locking property, the external doping agent is in a hydrogel state after water absorption, not only can the raw materials of the super retarding anti-cracking concrete be lubricated, thereby reducing the dosage of mixing water and improving the workability of the super retarding anti-cracking concrete, but also part of water in the super retarding anti-cracking concrete can be adsorbed, thereby achieving the effect of water retention and thickening, further improving the retarding water reducing effect of the super retarding anti-cracking concrete by matching with the retarder and the water reducing agent, avoiding bleeding caused by overlong retarding time of the super retarding concrete and loss of internal water, enabling the super retarding concrete to have enough water for full hydration in the later period, increasing the compactness of the super retarding anti-cracking concrete, and improving the durability of the super retarding anti-cracking concrete. On the other hand, the delayed coagulation water reducing auxiliary agent can obviously reduce the hydration heat released by the super delayed coagulation anti-cracking concrete in the post rapid solidification process while promoting the post hydration of the super delayed coagulation anti-cracking concrete, control reasonable hydration temperature, further reduce the temperature stress generated by the fact that the hydration temperature in the concrete exceeds the surface temperature, further reduce the cracks generated by the temperature stress, further increase the post strength of the super delayed coagulation anti-cracking concrete, and further improve the durability of the super delayed coagulation anti-cracking concrete.
Preferably, the mass ratio of the acetate starch to the temperature wheel glue to the polyethylene glycol monostearate is (10-12): (5-7): (1-2).
In the technical scheme, according to (10-12): (5-7): the mass ratio of (1-2) is compounded with acetate starch, warm wheel glue and polyethylene glycol monostearate, so that the components of the super-retarding anti-cracking concrete can be further lubricated and dispersed, bleeding of the super-retarding anti-cracking concrete is avoided, the water reducer and retarder are matched, hydration heat released by the super-retarding anti-cracking concrete in the later rapid solidification process is reduced, cracks of the super-retarding anti-cracking concrete are further reduced, and the durability of the super-retarding anti-cracking concrete is further improved.
Preferably, the retarder comprises white sugar and citric acid, wherein the mass ratio of the white sugar to the citric acid is (2-3): (1-1.5).
In the technical scheme, according to (2-3): the mass ratio of (1-1.5) is compounded with white sugar and citric acid, so that the initial setting time of the super-retarding anti-cracking concrete can be better delayed by being matched with the slow setting water reducing auxiliary agent, and the negative influence of the retarder on the later strength of the super-retarding anti-cracking concrete is further avoided.
Preferably, the water reducing agent is a polycarboxylate water reducing agent.
According to the technical scheme, the polycarboxylate water reducer is selected, so that the mixing water of the super-retarding anti-cracking concrete can be further reduced, the working performance of the super-retarding anti-cracking concrete is further improved, the post strength of the super-retarding anti-cracking concrete can be further increased by matching with the retarding water reducer auxiliary agent, and the durability of the super-retarding anti-cracking concrete is further improved.
Preferably, the fibers are carbon fibers.
According to the technical scheme, the carbon fiber with the heat conduction effect is selected, the delayed coagulation water reducing auxiliary agent can be matched with the raw materials of the super delayed coagulation anti-cracking concrete well while the raw materials are connected, hydration heat released by the super delayed coagulation anti-cracking concrete in the later stage is conducted away from the surface of the super delayed coagulation anti-cracking concrete, temperature stress generated by the fact that the hydration temperature in the concrete exceeds the surface temperature is avoided, cracks generated by the temperature stress are avoided, and therefore the strength of the super delayed coagulation anti-cracking concrete can be further enhanced by selecting the carbon fiber, and the durability of the super delayed coagulation anti-cracking concrete is further improved.
Preferably, the stone is continuous-grade crushed stone with the grain size ranging from 5mm to 25 mm.
According to the technical scheme, continuous-grade broken stone with the grain diameter of 5-25 mm is selected, so that the compactness of the super-retarding anti-cracking concrete can be further increased, and the durability of the super-retarding anti-cracking concrete is further improved.
Preferably, the fineness modulus of the machine-made sand is 2.7.
According to the technical scheme, the machine-made sand with the fineness modulus of 2.7 is selected, so that gaps among all raw materials of the super-retarding anti-cracking concrete can be better filled, the compactness of the super-retarding anti-cracking concrete is further improved, and the durability of the super-retarding anti-cracking concrete is further improved.
Preferably, the super-retarding anti-cracking concrete further comprises 2.7-3.8 parts of dicetyl dimethyl ammonium chloride and 1.9-2.6 parts of calcium dodecyl benzene sulfonate.
In the technical proposal, because the underground water contains abundant Na + 、K + 、Ca 2 + 、Mg 2 + 、Cl - 、SO 4 2- 、HCO 3 - Plasma, the ions permeate into the super-retarding anti-cracking concrete along with groundwater, and can generate corrosion effect on the super-retarding anti-cracking concrete, andthe super-retarding anti-cracking concrete acts to generate calcium sulfoaluminate and the like, so that the super-retarding anti-cracking concrete is internally swelled.
According to the super-retarding anti-cracking concrete, the dicetyl dimethyl ammonium chloride and the calcium dodecyl benzene sulfonate are further added into the super-retarding anti-cracking concrete, so that the binding force between raw materials of the super-retarding anti-cracking concrete is further improved, the compactness of the super-retarding anti-cracking concrete is improved, meanwhile, the corrosion resistance of the super-retarding anti-cracking concrete is also unexpectedly improved, the generation of expansion substances such as calcium sulfoaluminate is inhibited, the corrosion expansion of the super-retarding anti-cracking concrete is inhibited, the internal structure of the super-retarding anti-cracking concrete is further stabilized, and the durability of the super-retarding anti-cracking concrete is further improved.
In a second aspect, the present application provides a method for preparing super-retarding anti-cracking concrete, which adopts the following technical scheme:
a preparation method of super-retarding anti-cracking concrete comprises the following steps:
step 1: adding the water reducer, the retarder and the retarding and water reducing auxiliary agent into water, and uniformly stirring to obtain a mixed solution;
step 2: adding cement, fly ash, mineral powder, machine-made sand, stone and fiber into the mixed solution, and uniformly stirring to obtain the super-retarding concrete.
Among the above-mentioned technical scheme, through mixing water-reducing agent, retarder water-reducing auxiliary agent earlier, can make better the performance of the cooperation between the three water-reducing retarder effect, further improve super retarder crack-resistant concrete's durability, and the super retarder crack-resistant concrete preparation method of this application is simple and convenient, is fit for large-scale industrial production.
Preferably, the method comprises the following steps:
step one: adding a water reducing agent, a retarder, a retarding water reducing auxiliary agent, dicetyl dimethyl ammonium chloride and calcium dodecyl benzene sulfonate into water, and uniformly stirring to obtain a mixed solution;
step two: adding cement, fly ash, mineral powder, machine-made sand, stone and fiber into the mixed solution, and uniformly stirring to obtain the super-retarding concrete.
According to the technical scheme, the water reducing agent, the retarder, the retarding water reducing auxiliary agent, the dicetyl dimethyl ammonium chloride and the calcium dodecyl benzene sulfonate are mixed, so that the water reducing retarding anti-corrosion effect is better synergistically exerted, and the durability of the super retarding anti-cracking concrete is further improved.
In summary, the present application includes at least one of the following beneficial technical effects:
1. according to the method, the retarding water reducing auxiliary agent prepared from the acetate starch, the temperature wheel glue and the polyethylene glycol monostearate is doped into the super retarding anti-cracking concrete, the retarder and the water reducing agent can be matched, the retarding effect of the super retarding anti-cracking concrete is further improved, bleeding of the super retarding concrete and loss of water are avoided, meanwhile, the retarding water reducing auxiliary agent can also remarkably reduce hydration heat released by the super retarding anti-cracking concrete in a later quick solidification process, reasonable hydration temperature is controlled, cracks generated due to temperature stress are further reduced, the later strength of the super retarding anti-cracking concrete is further increased, and the durability of the super retarding anti-cracking concrete is further improved.
2. The application selects the carbon fiber with the heat conduction effect, and the setting retarder and the water reducing auxiliary agent can be better matched when various raw materials of the super setting retarder anti-cracking concrete are connected, so that hydration heat released by the super setting retarder anti-cracking concrete in the post-stage rapid solidification process is conducted to the surface of the super setting retarder anti-cracking concrete, the temperature stress generated by the fact that the hydration temperature in the concrete exceeds the surface temperature is avoided, and the crack generated by the temperature stress is avoided, so that the strength of the super setting retarder anti-cracking concrete can be further enhanced by selecting the carbon fiber, and the durability of the super setting retarder anti-cracking concrete is further improved.
3. According to the super-retarding anti-cracking concrete, the dicetyl dimethyl ammonium chloride and the calcium dodecyl benzene sulfonate are further added into the super-retarding anti-cracking concrete, so that the binding force between raw materials of the super-retarding anti-cracking concrete is further improved, the compactness of the super-retarding anti-cracking concrete is improved, meanwhile, the corrosion resistance of the super-retarding anti-cracking concrete is also unexpectedly improved, the generation of expansion substances such as calcium sulfoaluminate is inhibited, the corrosion expansion of the super-retarding anti-cracking concrete is inhibited, the internal structure of the super-retarding anti-cracking concrete is further stabilized, and the durability of the super-retarding anti-cracking concrete is further improved.
Detailed Description
For a better description of the objects, technical solutions and advantages of the present invention, the present invention will be further described with reference to the following specific examples.
Example 1
An ultra-retarding anti-cracking concrete comprises the following raw materials: 220kg of cement, 40kg of fly ash, 30kg of mineral powder, 800kg of machine-made sand, 950kg of stone, 3kg of fiber, 8.5kg of water reducer, 6.7kg of retarder, 6.1kg of retarder water reducing aid, 2.7kg of dicetyl dimethyl ammonium chloride, 1.9kg of calcium dodecyl benzene sulfonate and 100kg of water.
Wherein, the retarding and water reducing auxiliary agent is acetate starch, temperature wheel glue and polyethylene glycol monostearate according to the following weight ratio of 10:5:1 by mass ratio.
Wherein the fineness modulus of the machine-made sand is 2.7.
Wherein the stone is continuous-grade broken stone with the diameter of 5-25 mm.
Wherein the fibers are carbon fibers.
Wherein the water reducer is a polycarboxylate water reducer.
Wherein, the retarder is white sugar and citric acid according to the following weight ratio of 2:1 by mass ratio.
Among them, acetate starch was purchased from Yan Hua Biotechnology Co., guangzhou.
Among them, the temperature wheel glue is purchased from Shenzhen Lefu Biotechnology Co.
Among them, industrial white sugar is purchased from the company of Guangdong Australian chemical Co., ltd.
The preparation method of the super-retarding anti-cracking concrete comprises the following steps:
step one: adding a water reducing agent, a retarder, a retarding water reducing auxiliary agent, dicetyl dimethyl ammonium chloride and calcium dodecyl benzene sulfonate into water, and uniformly stirring to obtain a mixed solution;
step two: adding cement, fly ash, mineral powder, machine-made sand, stone and fiber into the mixed solution, and uniformly stirring to obtain the super-retarding concrete.
Example 2
The super-retarding anti-cracking concrete is different from the embodiment 1 in that the super-retarding anti-cracking concrete comprises the following raw materials: 240kg of cement, 50kg of fly ash, 35kg of mineral powder, 820kg of machine-made sand, 985kg of stone, 3.5kg of fiber, 9.2kg of water reducer, 7.4kg of retarder, 6.7kg of retarder water reducing aid, 3.2kg of dicetyl dimethyl ammonium chloride, 2.2kg of calcium dodecyl benzene sulfonate and 110kg of water.
Wherein, the retarding and water reducing auxiliary agent is acetate starch, temperature wheel glue and polyethylene glycol monostearate according to 11:6:1.5 by mass ratio.
Wherein, the retarder is white sugar and citric acid according to 2.5:1 by mass ratio.
Example 3
The super-retarding anti-cracking concrete is different from the embodiment 1 in that the super-retarding anti-cracking concrete comprises the following raw materials: 260kg of cement, 60kg of fly ash, 40kg of mineral powder, 840kg of machine-made sand, 1020kg of stone, 4kg of fiber, 9.8kg of water reducer, 8.2kg of retarder, 7.4kg of retarder water reducing aid, 3.8kg of dicetyl dimethyl ammonium chloride, 2.6kg of calcium dodecyl benzene sulfonate and 120kg of water.
Wherein, the retarding and water reducing auxiliary agent is acetate starch, temperature wheel glue and polyethylene glycol monostearate according to 12:7:2, and is compounded by mass ratio.
Wherein, the retarder is white sugar and citric acid according to the following weight ratio of 3:1.5 by mass ratio.
Example 4
The super retarding crack resistant concrete is different from the example 2 in that the equivalent amount of the ditetyl dimethyl ammonium chloride is replaced by water.
The preparation method of the super-retarding anti-cracking concrete comprises the following steps:
step one: adding the water reducer, the retarder, the retarding and water reducing auxiliary agent and the calcium dodecyl benzene sulfonate into water, and uniformly stirring to obtain a mixed solution;
step two: adding cement, fly ash, mineral powder, machine-made sand, stone and fiber into the mixed solution, and uniformly stirring to obtain the super-retarding concrete.
Example 5
The super retarding crack resistant concrete is different from the embodiment 2 in that the calcium dodecyl benzene sulfonate is replaced with water in equal amount.
The preparation method of the super-retarding anti-cracking concrete comprises the following steps:
step one: adding a water reducing agent, a retarder, a retarding water reducing auxiliary agent and dicetyl dimethyl ammonium chloride into water, and uniformly stirring to obtain a mixed solution;
step two: adding cement, fly ash, mineral powder, machine-made sand, stone and fiber into the mixed solution, and uniformly stirring to obtain the super-retarding concrete.
Example 6
The super retarding crack-resistant concrete is different from the concrete in the embodiment 2 in that the equivalent amount of the dicetyl dimethyl ammonium chloride and the calcium dodecyl benzene sulfonate is replaced by water.
The preparation method of the super-retarding anti-cracking concrete comprises the following steps:
step one: adding the water reducer, the retarder and the retarding and water reducing auxiliary agent into water, and uniformly stirring to obtain a mixed solution;
step two: adding cement, fly ash, mineral powder, machine-made sand, stone and fiber into the mixed solution, and uniformly stirring to obtain the super-retarding concrete.
Example 7
An ultra-retarded crack-resistant concrete differs from example 6 in that the fibers are glass fibers.
Comparative example 1
An ultra-retarded crack-resistant concrete differs from example 6 in that the acetate starch is replaced with equal amount of water.
Comparative example 2
An ultra-retarding crack-resistant concrete is different from example 6 in that the temperature wheel glue is replaced with water in equal amount.
Comparative example 3
An ultra-retarding crack-resistant concrete is different from example 6 in that polyethylene glycol monostearate is replaced with equal amount of water.
Performance testing
Initial setting time (min) and final setting time (min): the method is measured according to GB/T500802016 common concrete mixture performance test method, and the interval time (min) of the initial setting time and the final setting time is calculated, wherein the interval time (min) =the final setting time-the initial setting time.
Compressive strength: the test piece size is measured according to the compression strength test in GB/T50081-2019, test method Standard for physical mechanical Properties of concrete: 100 mm. Times.100 mm square, tested after 28d standard curing, and measured compressive strength (MPa).
Flexural strength: the test piece size is measured according to the flexural strength test in GB/T50081-2019, test method Standard for physical mechanical Properties of concrete: 100 mm. Times.100 mm. Times.400 mm cuboid, after 28d standard curing test, flexural strength (MPa) was measured.
Water permeation resistance: the test piece size is measured according to the water seepage height method in GB/T50082-2009 "test method Standard for Long-term Performance and durability of common concrete", wherein the test piece size is as follows: the method is characterized in that the height of the truncated cone is 150mm, the diameter of the lower part of the truncated cone is 180mm, the diameter of the upper part of the truncated cone is 175mm, the truncated cone is tested after standard curing for 28d, the water pressure is 1MPa during testing, the testing time is 24h, the water seepage height (mm) is measured, the smaller the water seepage height value is, and the better the water seepage resistance of the concrete is proved.
Sulfate resistance: the test piece size is measured according to the sulfate erosion resistance test in GB/T50082-2009 "test method Standard for Long-term Properties and durability of common concrete", which is: 100mm cuboid, test after 28d standard curing, test solution 5% Na 2 SO 4 The solution was subjected to a test for a cycle time of 24 hours each, and after 90 cycles, the test piece was tested for compressive strength after corrosion (MPa) and the corrosion resistance coefficient (%) was calculated, corrosion resistance coefficient (%) = [ compressive strength after corrosion (MPa)/compressive strength before corrosion (MPa)]* The greater the corrosion resistance coefficient (%) is, the better the sulfate attack resistance of the concrete is proved.
The results of the above test are shown in Table 1.
Table 1:
by combining example 6, comparative examples 1-3 and Table 1, it can be obtained that the super-retarding anti-cracking concrete can be obtained by adding retarding water reducing auxiliary agent prepared from acetate starch, hotplate rubber and polyethylene glycol monostearate to the super-retarding anti-cracking concrete, so that the initial setting time of the super-retarding anti-cracking concrete can be prolonged, the time interval between initial setting and final setting is shortened, and the super-retarding anti-cracking concrete with good compressive strength, breaking strength, water permeability resistance and sulfate erosion resistance can be obtained. The concrete analysis of the applicant considers that the retarding and water reducing auxiliary agent prepared from the acetate starch, the temperature wheel gel and the polyethylene glycol monostearate can be matched with the retarder and the water reducing agent to further improve the water reducing and retarding effects of the concrete, can obviously shorten the time interval between initial setting and final setting of the super retarding and cracking-resistant concrete, can also control reasonable hydration temperature, further reduce cracks generated due to temperature stress, further increase the later strength of the super retarding and cracking-resistant concrete, and further improve the mechanical strength and durability of the super retarding and cracking-resistant concrete.
By combining example 6, example 7 and table 1, it can be obtained that the compressive strength, flexural strength, water permeability resistance and sulfate erosion resistance of the super-retarding anti-cracking concrete can be further improved by adding carbon fibers into the super-retarding anti-cracking concrete. The applicant specifically analyzes that the carbon fiber has a heat conduction effect, and can be matched with the control effect of the retarding and water reducing auxiliary agent on the hydration temperature, so that the temperature of each part of the super retarding and anti-cracking concrete can be uniform, cracks caused by temperature stress are avoided, and the mechanical strength and durability of the super retarding and anti-cracking concrete are further improved.
By combining examples 1 to 3, examples 4 to 6 and Table 1, it was found that the compressive strength, flexural strength, water permeability resistance and sulfate corrosion resistance of super-retarding anti-cracking concrete could be further improved by adding dicetyl dimethyl ammonium chloride and calcium dodecyl benzene sulfonate to the super-retarding anti-cracking concrete. The specific analysis of the applicant proves that the bi-hexadecyl dimethyl ammonium chloride and the calcium dodecyl benzene sulfonate can enhance the binding force among the raw materials of the super-retarding anti-cracking concrete, so that the compactness of the super-retarding anti-cracking concrete is improved, and the mechanical strength of the super-retarding anti-cracking concrete is further improved. In addition, the mutual coordination of the dicetyl dimethyl ammonium chloride and the calcium dodecyl benzene sulfonate can also inhibit the generation of expansion substances such as calcium sulfoaluminate and the like, and inhibit the corrosion expansion of the super-retarding anti-cracking concrete, so that the internal structure of the super-retarding anti-cracking concrete is further stabilized, and the durability of the super-retarding anti-cracking concrete is further improved.
The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the claims of the present application.
Claims (6)
1. The super-retarding anti-cracking concrete is characterized by comprising the following raw materials in parts by weight: 220-260 parts of cement, 40-60 parts of fly ash, 30-40 parts of mineral powder, 800-840 parts of machine-made sand, 950-1020 parts of stone, 3-4 parts of fiber, 8.5-9.8 parts of water reducer, 6.7-8.2 parts of retarder, 6.1-7.4 parts of retarding and water reducing auxiliary agent and 100-120 parts of water;
wherein the retarding and water reducing auxiliary agent is a mixture of acetate starch, hotplate rubber and polyethylene glycol monostearate;
the mass ratio of the acetate starch to the temperature wheel glue to the polyethylene glycol monostearate is (10-12): (5-7): (1-2);
the retarder comprises white sugar and citric acid, wherein the mass ratio of the white sugar to the citric acid is (2-3): (1-1.5);
the water reducing agent is a polycarboxylate water reducing agent;
the fibers are carbon fibers.
2. The ultra-retarding crack-resistant concrete according to claim 1, wherein the stone is continuous-grade crushed stone with a grain size range of 5-25 mm.
3. The ultra-retarding crack-resistant concrete according to claim 1, wherein the fineness modulus of the machine-made sand is 2.7.
4. The super-retarding and anti-cracking concrete according to any one of claims 2-3, further comprising 2.7-3.8 parts of dicetyl dimethyl ammonium chloride and 1.9-2.6 parts of calcium dodecyl benzene sulfonate.
5. A method for preparing the super-retarding anti-cracking concrete according to any one of claims 1 to 3, which is characterized by comprising the following steps:
step 1: adding the water reducer, the retarder and the retarding and water reducing auxiliary agent into water, and uniformly stirring to obtain a mixed solution;
step 2: adding cement, fly ash, mineral powder, machine-made sand, stone and fiber into the mixed solution, and uniformly stirring to obtain the super-retarding anti-cracking concrete.
6. A method for preparing the ultra-retarding anti-cracking concrete according to claim 4, which is characterized by comprising the following steps:
step one: adding a water reducing agent, a retarder, a retarding water reducing auxiliary agent, dicetyl dimethyl ammonium chloride and calcium dodecyl benzene sulfonate into water, and uniformly stirring to obtain a mixed solution;
step two: adding cement, fly ash, mineral powder, machine-made sand, stone and fiber into the mixed solution, and uniformly stirring to obtain the super-retarding anti-cracking concrete.
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