CN113060985B - Environment-friendly anti-freezing concrete and preparation method thereof - Google Patents
Environment-friendly anti-freezing concrete and preparation method thereof Download PDFInfo
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- CN113060985B CN113060985B CN202110290186.9A CN202110290186A CN113060985B CN 113060985 B CN113060985 B CN 113060985B CN 202110290186 A CN202110290186 A CN 202110290186A CN 113060985 B CN113060985 B CN 113060985B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 24
- 238000007710 freezing Methods 0.000 title claims abstract description 13
- -1 polypropylene Polymers 0.000 claims abstract description 60
- 239000004743 Polypropylene Substances 0.000 claims abstract description 59
- 239000000835 fiber Substances 0.000 claims abstract description 59
- 229920001155 polypropylene Polymers 0.000 claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 23
- 239000000843 powder Substances 0.000 claims abstract description 15
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 239000004568 cement Substances 0.000 claims abstract description 7
- 239000004576 sand Substances 0.000 claims abstract description 7
- 239000004575 stone Substances 0.000 claims abstract description 7
- 229920001600 hydrophobic polymer Polymers 0.000 claims abstract description 5
- 230000002528 anti-freeze Effects 0.000 claims abstract description 4
- 238000003756 stirring Methods 0.000 claims description 28
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 16
- VZGDMQKNWNREIO-UHFFFAOYSA-N tetrachloromethane Chemical compound ClC(Cl)(Cl)Cl VZGDMQKNWNREIO-UHFFFAOYSA-N 0.000 claims description 16
- 239000000178 monomer Substances 0.000 claims description 14
- 238000005406 washing Methods 0.000 claims description 13
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 12
- 239000007787 solid Substances 0.000 claims description 12
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 239000011259 mixed solution Substances 0.000 claims description 10
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 9
- 239000003999 initiator Substances 0.000 claims description 8
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical group CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 claims description 7
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 6
- 239000005977 Ethylene Substances 0.000 claims description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 239000010881 fly ash Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000011863 silicon-based powder Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 4
- 150000008130 triterpenoid saponins Chemical group 0.000 claims description 4
- 230000000052 comparative effect Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000011800 void material Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000002969 artificial stone Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
-
- 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
-
- 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 application relates to the field of concrete, and particularly discloses environment-friendly anti-freezing concrete which is prepared from the following raw materials in parts by weight: 100 portions of cement, 90 to 100 portions of coarse sand, 130 portions of stone, 5 to 10 portions of air entraining agent, 120 portions of active powder admixture, 6 to 10 portions of antifreeze, 30 to 38 portions of modified polypropylene fiber, 9 to 16 portions of water reducing agent and 115 portions of water; the modified polypropylene fiber is prepared by grafting a hydrophobic polymer on the surface, and has the advantage of improving the frost resistance of concrete; in addition, a preparation method of the environment-friendly anti-freezing concrete is also provided.
Description
Technical Field
The application relates to the field of concrete, in particular to environment-friendly anti-freezing concrete and a preparation method thereof.
Background
Concrete is one of the most important civil engineering materials of the present generation. The artificial stone is prepared by a cementing material, granular aggregate (also called aggregate), water, an additive and an admixture which are added if necessary according to a certain proportion, and is formed by uniformly stirring, compacting, forming, curing and hardening. The concrete has the characteristics of rich raw materials, low price and simple production process, so that the consumption of the concrete is increased more and more. Meanwhile, the concrete also has the characteristics of high compressive strength, good durability, wide strength grade range and the like. These characteristics make it very widely used, not only in various civil engineering, that is shipbuilding, machinery industry, ocean development, geothermal engineering, etc., but also concrete is an important material.
However, due to the large temperature span in the north, the temperature difference between summer and winter and day and night makes the concrete crack easily, which is not favorable for the durability of the concrete.
In view of the above-mentioned related art, the inventors have considered that in order to adapt to northern climates, it is necessary to improve the frost resistance of concrete.
Disclosure of Invention
In order to improve the frost resistance of concrete, a first object of the present application is to provide an environment-friendly frost resistant concrete.
The second purpose of the application is to provide a preparation method of the environment-friendly antifreezing concrete.
The application provides a frost-resistant type concrete of environmental protection adopts following technical scheme:
the environment-friendly anti-freezing concrete is prepared from the following raw materials in parts by weight: 100 portions of cement, 90 to 100 portions of coarse sand, 130 portions of stone, 5 to 10 portions of air entraining agent, 120 portions of active powder admixture, 6 to 10 portions of antifreeze, 30 to 38 portions of modified polypropylene fiber, 9 to 16 portions of water reducing agent and 115 portions of water;
wherein, the modified polypropylene fiber is prepared by grafting a hydrophobic polymer on the surface.
By adopting the technical scheme, the active powder admixture is added into the concrete, so that larger pores in the concrete can be filled, and the active powder admixture and the air entraining agent can act synergistically, thereby reducing the void ratio of the concrete, reducing the absorption of the concrete to moisture, reducing the damage of the moisture and improving the frost resistance of the concrete; the modified polypropylene fiber can improve the crack resistance of concrete, and can improve the blocking effect of pore connectivity and reduce the water seepage amount of the concrete by performing hydrophobic modification on the polypropylene fiber, thereby reducing the damage effect of water on the concrete and improving the frost resistance of the concrete.
Preferably, the preparation steps of the modified polypropylene fiber are as follows according to parts by weight:
1) adding 1-3 parts of polypropylene fiber into 30-35 parts of DMF (dimethyl formamide), stirring to uniformly disperse the polypropylene fiber, then adding a silane coupling agent monomer and ethylene, stirring for 20-30min under the protection of nitrogen, then adding 0.010-0.015 part of an initiator, continuously stirring, heating to 67-72 ℃, and stirring for reacting for 30-36h to obtain a mixed solution;
2) and filtering the mixed solution to obtain a solid, and washing and drying the solid to obtain the modified polypropylene fiber.
By adopting the technical scheme, the hydrophobic polymer can be obtained by polymerizing the silane coupling agent monomer and ethylene, the hydrophobic polymer is grafted with the polypropylene fiber, and then the modified polypropylene fiber can be obtained by filtering, washing and drying.
Preferably, the initiator in step 1) is azobisisobutyronitrile.
By adopting the technical scheme, the azodiisobutyronitrile is an oil-soluble azo initiator, the azo initiator has stable reaction, is a first-order reaction, has no side reaction, is better controlled, and is more suitable for the reaction of polyolefin.
Preferably, the washing in the step 2) is performed by carbon tetrachloride, and then by ethanol.
By adopting the technical scheme, the carbon tetrachloride has better solubility to unreacted monomers, the unreacted monomers can be removed by washing the carbon tetrachloride, then the carbon tetrachloride can be removed by ethanol, so that the ethanol exists on the surface of the modified polypropylene fiber, and the modified polypropylene fiber can be quickly dried by utilizing the lower boiling point of the ethanol.
Preferably, the silane coupling agent monomer is vinyltrimethoxysilane.
By adopting the technical scheme, the vinyltrimethoxysilane is mainly used for polyethylene crosslinking and is very suitable for surface treatment of polypropylene fibers.
Preferably, the active powder admixture is prepared by mixing fly ash and silicon powder, wherein the ratio of fly ash: and (3) silicon powder: 2.
By adopting the technical scheme, the performance of the obtained concrete is better under the condition that the active powder admixture is in the proportion.
Preferably, the polypropylene fibers have a length of 3 to 19 mm.
Preferably, the air entraining agent is a triterpenoid saponin air entraining agent, and the water reducing agent is a polycarboxylic acid type water reducing agent.
By adopting the technical scheme, the triterpenoid saponin air entraining agent has the function of remarkably reducing the surface tension of the solution, generates closed and independent bubbles, has the characteristics of high foaming multiple, large quantity of bubbles, small bubble spacing and long foam stabilizing time, can obviously improve the working performance of plastic concrete and improve the durability of hardened concrete, and can make the pores in the concrete smaller by matching with the polycarboxylic acid type water reducing agent.
The second purpose of the application is to provide a preparation method of the environment-friendly anti-freezing concrete, which adopts the following technical scheme: the preparation method of the environment-friendly anti-freezing concrete comprises the following steps:
uniformly stirring cement, coarse sand, active powder admixture, stones, a water reducing agent and modified polypropylene fibers, then adding water, an air entraining agent and a waterproof agent, and uniformly stirring to obtain the environment-friendly antifreezing concrete.
By adopting the technical scheme, the raw materials of the concrete are sequentially adjusted, so that the uniform mixing speed is high, and the concrete with uniform texture is obtained.
In summary, the present application has the following beneficial effects:
1. by adding the active powder admixture into the concrete, larger pores in the concrete can be filled, and the active powder admixture and the air entraining agent act synergistically, so that the void ratio of the concrete is reduced, the absorption of the concrete on water is reduced, the damage effect of the water is reduced, and the frost resistance of the concrete is improved; the modified polypropylene fiber can improve the crack resistance of concrete, and can improve the blocking effect of pore connectivity and reduce the water seepage amount of the concrete by performing hydrophobic modification on the polypropylene fiber, thereby reducing the damage effect of water on the concrete and improving the frost resistance of the concrete.
2. The compressive strength of the concrete prepared by the application is above 57.9MPa, the reduction of the compressive strength of the concrete is below 5.3MPa after 20 times of freeze-thaw cycle, and the compressive strength of the concrete is not more than 7.4MPa after 50 times of freeze-thaw cycle.
Detailed Description
The present application will be described in further detail with reference to examples.
Raw materials
An antifreezing agent: the manufacturer is Jinan Hui Jinchuan chemical Co., Ltd, and the model is industrial grade;
polypropylene fiber: the manufacturer is Dingsheng engineering materials Co., Ltd, and the length range is 3-19 mm;
silane coupling agent monomer: vinyl trimethoxy silane is adopted, and the manufacturer is Jinan Jingchuan chemical company Limited, and the content is 97.5 percent;
air entraining agent: the triterpenoid saponin air entraining agent is adopted, and a manufacturer is Shandong Hongquan chemical technology limited company, and the effective content is 99 percent; water reducing agent: the polycarboxylic acid type water reducing agent is adopted, and the manufacturer is Saint Chengshenglong chemical company, Inc. in Hebei.
Preparation example
Preparation example 1
A modified polypropylene fiber is prepared by the following steps:
1) adding 3kg of polypropylene fibers into 30kg of DMF (dimethyl formamide), stirring to uniformly disperse the polypropylene fibers, then adding 0.003kg of silane coupling agent monomer and 0.09kg of ethylene, wherein the silane coupling agent monomer is vinyl trimethoxy silane, stirring for 20min under the protection of nitrogen, then adding 0.015kg of initiator which is azobisisobutyronitrile, continuously stirring, heating to 67 ℃, and stirring for reacting for 36h to obtain a mixed solution;
2) and filtering the mixed solution to obtain a solid, washing the solid by carbon tetrachloride three times, then washing the solid by ethanol three times, and then drying to obtain the modified polypropylene fiber.
Preparation example 2
The modified polypropylene fiber is prepared by the following steps:
1) adding 1kg of polypropylene fiber into 35kg of DMF, stirring to uniformly disperse the polypropylene fiber, then adding 0.005kg of silane coupling agent monomer and 0.07kg of ethylene, wherein the silane coupling agent monomer is vinyl trimethoxy silane, stirring for 30min under the protection of nitrogen, then adding 0.010kg of initiator which is azobisisobutyronitrile, continuously stirring, heating to 72 ℃, and stirring for reacting for 30h to obtain a mixed solution;
2) and filtering the mixed solution to obtain a solid, washing the solid by carbon tetrachloride three times, then washing by ethanol three times, and then drying to obtain the modified polypropylene fiber.
Preparation example 3
A modified polypropylene fiber is prepared by the following steps:
1) adding 2kg of polypropylene fiber into 32kg of DMF, stirring to uniformly disperse the polypropylene fiber, then adding 0.004kg of silane coupling agent monomer and 0.08kg of ethylene, wherein the silane coupling agent monomer is vinyl trimethoxy silane, stirring for 25min under the protection of nitrogen, then adding 0.013kg of initiator which is azobisisobutyronitrile, continuously stirring, heating to 70 ℃, and stirring for reacting for 33h to obtain a mixed solution;
2) and filtering the mixed solution to obtain a solid, washing the solid by carbon tetrachloride three times, then washing the solid by ethanol three times, and then drying to obtain the modified polypropylene fiber.
Examples
Examples 1 to 5
The environmental-friendly antifreezing concrete of examples 1 to 5, wherein the raw materials and the amounts of the raw materials are shown in Table 1, is prepared by the following steps:
mixing fly ash and silicon powder according to the mass ratio of fly ash: stirring and mixing the silicon powder in a ratio of 3:2 to obtain an active powder admixture;
uniformly stirring cement, coarse sand, active powder admixture, stones, a water reducing agent and modified polypropylene fibers, then adding water, an air entraining agent and a waterproof agent, and uniformly stirring to obtain the environment-friendly antifreezing concrete.
The modified polypropylene fiber was obtained from preparation example 1.
TABLE 1 materials and amounts (kg) of materials of examples 1-5
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | |
| Cement | 100 | 103 | 105 | 107 | 110 |
| Coarse sand | 100 | 98 | 95 | 92 | 90 |
| Stone | 110 | 115 | 120 | 125 | 130 |
| Air entraining agent | 10 | 9 | 8 | 7 | 5 |
| Active powder admixture | 120 | 123 | 125 | 128 | 130 |
| Antifreezing agent | 10 | 9 | 8 | 7 | 6 |
| Modified polypropylene fiber | 30 | 32 | 34 | 36 | 38 |
| Water reducing agent | 16 | 14 | 12 | 10 | 9 |
| Water (W) | 110 | 112 | 113 | 115 | 116 |
Examples 6 to 9
An environment-friendly antifreeze concrete of examples 6 to 9 is different from that of example 4 in that the modified polypropylene fibers are added in the amounts of 30kg, 32kg, 34kg and 38kg in this order, and the concrete is prepared as in preparation example 1, and the rest of the steps are the same as those of example 4.
Example 10
An environment-friendly antifreezing concrete is different from the concrete in example 4 in that the modified polypropylene fiber added is obtained from the preparation example 2, and the rest steps are the same as the preparation example 4.
Example 11
An environment-friendly antifreezing concrete is different from the concrete in example 4 in that the modified polypropylene fiber added is obtained from preparation example 3, and the rest steps are the same as those of preparation example 4.
Comparative example
Comparative example 1
The environment-friendly antifreezing concrete is different from the concrete in example 4 in that the added modified polypropylene fiber is replaced by equal parts by weight of polypropylene fiber, and the rest steps are the same as those in preparation example 4.
Comparative example 2
An environment-friendly antifreezing concrete is different from the concrete in example 4 in that the added modified polypropylene fiber is 0, and the rest steps are the same as the preparation example 4.
Comparative example 3
An environment-friendly antifreezing concrete is different from the concrete in example 4 in that an antifreezing agent is 0, and the rest steps are the same as those in preparation example 4.
Performance test
Detection method
Concrete was prepared in the same manner as in examples 1 to 11 and comparative examples 1 to 3, respectively, and the curing procedure was the same. And then testing the mechanical property of the concrete according to the method in GB/T50081-2002. The test method is respectively tested according to GB/T50082-2009 and the standard of the test method of the long-term performance and the durability of the common concrete. The results are shown in Table 2.
TABLE 2 examination results of the concrete of examples 1 to 11 and comparative examples 1 to 3
As can be seen from the detection data in Table 2, the compressive strength of the concrete prepared by the method is over 57.9MPa, the compressive strength reduction amount of the concrete after 20 times of freeze-thaw cycle is below 5.3MPa, and the compressive strength of the concrete after 50 times of freeze-thaw cycle is no more than 7.4MPa, which indicates that the concrete prepared by the method has better frost resistance.
As can be seen from the test data of example 4 and examples 6-9, the compressive strength of the modified polypropylene fibers is basically unchanged when the amount of the modified polypropylene fibers is gradually increased, but after the addition of the modified polypropylene fibers is performed for 20 times and 50 times in the freeze-thaw cycle, the compressive strength is gradually reduced as the amount of the modified polypropylene fibers is gradually increased, but the compressive strength is not significantly reduced when the amount of the modified polypropylene fibers is added to 36 kg.
As can be seen from the examination data of example 4 and examples 10 to 11, the modified polypropylene fibers prepared in preparation examples 1 to 3 were not significantly different.
As can be seen from the detection data of example 4 and comparative examples 1 to 3, the concrete added with the modified polypropylene fiber has smaller reduction of the compressive strength than the concrete added with the polypropylene fiber, which indicates that the concrete prepared by adding the modified polypropylene fiber has better freezing resistance; the antifreezing agent and the modified polypropylene fiber are added to have a synergistic effect.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (6)
1. The environment-friendly anti-freezing concrete is characterized by being prepared from the following raw materials in parts by weight: 100 portions of cement, 90 to 100 portions of coarse sand, 130 portions of stone, 5 to 10 portions of air entraining agent, 120 portions of active powder admixture, 6 to 10 portions of antifreeze, 30 to 38 portions of modified polypropylene fiber, 9 to 16 portions of water reducing agent and 115 portions of water;
wherein, the modified polypropylene fiber is prepared by grafting a hydrophobic polymer on the surface;
the preparation method of the modified polypropylene fiber comprises the following steps of:
1) adding 1-3 parts of polypropylene fiber into 30-35 parts of DMF (dimethyl formamide), stirring to uniformly disperse the polypropylene fiber, then adding 0.003-0.005 part of silane coupling agent monomer and 0.07-0.09 part of ethylene, stirring for 20-30min under the protection of nitrogen, then adding 0.010-0.015 part of initiator which is azobisisobutyronitrile, continuously stirring, heating to 67-72 ℃, and stirring for reacting for 30-36h to obtain a mixed solution; the silane coupling agent monomer is vinyl trimethoxy silane;
2) and filtering the mixed solution to obtain a solid, and washing and drying the solid to obtain the modified polypropylene fiber.
2. The environment-friendly anti-freezing concrete according to claim 1, wherein: washing by carbon tetrachloride in the step 2), and then washing by ethanol.
3. The environment-friendly anti-freezing concrete according to claim 1, wherein: the active powder admixture is prepared by mixing fly ash and silicon powder, wherein the fly ash: silicon powder =3: 2.
4. The environment-friendly anti-freezing concrete according to claim 1, wherein: the length of the polypropylene fiber is 3-19 mm.
5. The environment-friendly frost-resistant concrete according to claim 1, wherein: the air entraining agent is a triterpenoid saponin air entraining agent, and the water reducing agent is a polycarboxylic acid type water reducing agent.
6. A method for preparing the environment-friendly frost-resistant concrete according to any one of claims 1 to 5, wherein the method comprises the following steps: the preparation method comprises the following steps:
and uniformly stirring the cement, the coarse sand, the active powder admixture, the stones, the water reducing agent and the modified polypropylene fiber, then adding the water, the air entraining agent and the antifreezing agent, and uniformly stirring to obtain the environment-friendly antifreezing concrete.
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| CN106007530B (en) * | 2016-05-25 | 2018-08-10 | 句容联众科技开发有限公司 | Frost-resistant concrete |
| KR101900248B1 (en) * | 2018-02-06 | 2018-11-05 | 주식회사 삼한개발 | Improved cement mortar composition with anti-environment performance |
| CN108395194A (en) * | 2018-04-09 | 2018-08-14 | 合肥月煌新型装饰材料有限公司 | A kind of glass fiber reinforced gypsum based composites and preparation method thereof |
| CN108503314A (en) * | 2018-06-13 | 2018-09-07 | 合肥协耀玻璃制品有限公司 | A kind of unburned pavior brick of addition hydrophobically modified glass fibre |
| CN109574567B (en) * | 2019-01-19 | 2021-03-23 | 江苏盛达飞建筑材料有限公司 | Anti-freezing recycled concrete and preparation method thereof |
| CN110256023B (en) * | 2019-08-01 | 2021-08-17 | 西安新意达建筑制品有限公司 | Anti-freezing, anti-permeability and anti-cracking concrete and preparation method thereof |
| CN111099860A (en) * | 2019-12-23 | 2020-05-05 | 武汉君善建混凝土有限公司 | High-performance anti-freezing concrete and preparation method thereof |
| CN111423192B (en) * | 2020-06-01 | 2020-12-01 | 中铁二局集团有限公司 | Method for improving deformation capacity of high-ductility concrete |
| CN112408911A (en) * | 2020-11-20 | 2021-02-26 | 上海浦盈混凝土有限公司 | Anti-freezing concrete mixture and preparation method thereof |
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2021
- 2021-03-18 CN CN202110290186.9A patent/CN113060985B/en not_active Expired - Fee Related
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