CN114133187A - Anti-cracking impervious concrete - Google Patents
Anti-cracking impervious concrete Download PDFInfo
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- CN114133187A CN114133187A CN202111536079.6A CN202111536079A CN114133187A CN 114133187 A CN114133187 A CN 114133187A CN 202111536079 A CN202111536079 A CN 202111536079A CN 114133187 A CN114133187 A CN 114133187A
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- 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
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- 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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0625—Polyalkenes, e.g. polyethylene
- C04B16/0633—Polypropylene
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- 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- 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
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- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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- 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
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- 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 discloses an anti-cracking and anti-permeability concrete, which comprises: 200-300 parts of cement, 60-100 parts of mineral powder, 30-50 parts of fly ash, 150-170 parts of water, 880-960 parts of sand, 900-980 parts of stone, 7-12 parts of water reducing agent and 0.9-1.5 parts of anti-cracking and anti-permeability reinforcing agent; the anti-cracking and anti-permeability reinforcing agent is prepared as follows: s1, reacting the polypropylene fiber treated by the plasma gas, the graphene oxide aqueous solution and the reducing agent for 45min to obtain a first treatment object, repeatedly washing the first treatment object with deionized water for 5-10 times, and then freeze-drying to obtain a second treatment object; and S2, taking the chitosan quaternary ammonium salt and the second treatment substance, stirring for 3 hours in deionized water at room temperature to obtain a mixed solution, and freeze-drying the mixed solution to obtain the anti-cracking and anti-permeability enhancer. According to the invention, the polypropylene fibers are modified by using the plasma gas and the graphene, and the prepared concrete has strong anti-cracking and anti-permeability performance and good application prospect.
Description
Technical Field
The invention relates to the field of concrete. More particularly, the invention relates to an anti-cracking and anti-permeability concrete.
Background
With the development of economy, underground engineering gradually becomes one of the main melodies of modern development, wherein, the anti-cracking and anti-seepage performance of concrete is a main factor for restricting the durability of the underground engineering. In the prior art, fibers are often added into concrete to improve the anti-cracking and anti-permeability performance of the concrete. The commonly used fibers include polypropylene fibers, glass fibers, carbon fibers and the like, and the polypropylene fibers are most widely applied. However, when the polypropylene fiber is applied to concrete, the interface action between the polypropylene fiber and the concrete is not strong enough, and the anti-cracking and anti-permeability effects of the polypropylene fiber are affected.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
The invention also aims to provide anti-cracking and anti-permeability concrete and a preparation method thereof, wherein the polypropylene fibers are modified by graphene, so that the graphene is attached to the polypropylene fibers, the interface acting force of the graphene in the concrete is improved, and then the polypropylene fibers modified by the graphene are treated by chitosan quaternary ammonium salt, so that the water solubility and the dispersibility of the polypropylene fibers are improved, and the anti-cracking and anti-permeability performance of the concrete blended with the polypropylene fibers is finally improved.
To achieve these objects and other advantages in accordance with the present invention, there are provided an anti-cracking and anti-permeability concrete and a method for preparing the same, comprising the following components in parts by weight:
200-300 parts of cement, 60-100 parts of mineral powder, 30-50 parts of fly ash, 150-170 parts of water, 880-960 parts of sand, 900-980 parts of stone, 7-12 parts of water reducing agent and 0.9-1.5 parts of anti-cracking and anti-permeability reinforcing agent;
wherein, the anti-cracking and anti-permeability reinforcing agent is prepared as follows:
s1, placing plasma gas, dopamine-treated polypropylene fibers, graphene oxide aqueous solution and a reducing agent in a closed container, stirring and ultrasonically treating for 20min, then placing at 75-85 ℃ for reacting for 45min to obtain a first treatment object, repeatedly washing the first treatment object with deionized water for 5-10 times, and then placing at-85 ℃ for freeze drying to obtain a second treatment object; wherein the mass ratio of the polypropylene fiber to the graphene oxide aqueous solution to the reducing agent is 1: 100: 1-2, wherein the mass concentration of the graphene oxide aqueous solution is 2 mg/ml;
s2, taking the chitosan quaternary ammonium salt and the second treatment substance, stirring for 3 hours in deionized water at room temperature to obtain a mixed solution, carrying out suction filtration on the mixed solution, taking filter residues, and freeze-drying to obtain the anti-cracking and anti-permeability enhancer; the mass ratio of the chitosan quaternary ammonium salt to the second treatment substance to the deionized water is 1: 2: 200.
preferably, the plasma-treated polypropylene fiber is prepared as follows: treating the polypropylene fibers for 400s with mixed plasma gas under 80W to obtain an intermediate product; soaking the intermediate product in a dopamine solution, treating for 45min to obtain a third treated substance, repeatedly cleaning the third treated substance with deionized water for 5-10 times, and then placing at 70 ℃ for vacuum drying to obtain polypropylene fibers treated by plasma gas; wherein the mass ratio of the intermediate product to the dopamine solution is 1: 50, the mixed plasma gas consists of argon and oxygen, and the volume ratio of the argon to the oxygen is 9: 1, the mass concentration of the dopamine solution is 2 g/L.
Preferably, the graphene oxide aqueous solution is prepared by dispersing graphene oxide in deionized water, and the graphene oxide is prepared by a Hummers method.
Preferably, the polypropylene fiber is 5-10 mm fiber.
Preferably, the reducing agent is one of ascorbic acid, hydrazine hydrate, sodium borohydride, ammonia borane, hydrohalic acid and hydroiodic acid.
Preferably, the reducing agent is ascorbic acid.
Preferably, the nano-alumina also comprises 0.15 to 0.2 weight part of nano-alumina.
The invention at least comprises the following beneficial effects:
the invention provides anti-cracking and anti-permeability concrete, which is characterized in that graphene is used for modifying polypropylene fibers, so that the graphene is attached to the polypropylene fibers, the interface acting force of the graphene in the concrete is improved, then chitosan quaternary ammonium salt is used for treating the polypropylene fibers after the graphene is modified, the water solubility and the dispersibility of the polypropylene fibers are improved, and the anti-cracking and anti-permeability performance of the concrete mixed with the polypropylene fibers is finally improved.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
< example 1>
The invention provides anti-cracking and anti-permeability concrete which comprises the following components in parts by weight:
200 parts of cement, 70 parts of mineral powder, 50 parts of fly ash, 165 parts of water, 940 parts of sand, 970 parts of stone, 8.8 parts of water reducing agent and 1.2 parts of anti-cracking and anti-permeability reinforcing agent; the cement is P.042.5 cement, and the fly ash is class II fly ash; the sand is artificial sand, the fineness modulus of the sand is 2.8-3.0, and the sand is medium sand in a zone II; the stones are artificial crushed stones of 5-25 mm and are graded continuously; the water reducing agent is an AF-CA polycarboxylic acid type high-efficiency water reducing agent;
wherein, the anti-cracking and anti-permeability reinforcing agent is prepared as follows:
s1, placing the polypropylene fiber treated by plasma gas and dopamine, the graphene oxide aqueous solution and a reducing agent into a closed container, stirring and ultrasonically treating for 20min, then placing the container at 80 ℃ for reacting for 45min to obtain a first treated object, repeatedly washing the first treated object with deionized water for 5-10 times, and then placing the first treated object at-85 ℃ for freeze drying to obtain a second treated object; wherein the mass ratio of the polypropylene fiber to the graphene oxide aqueous solution to the reducing agent is 1: 100: 1.5, wherein the mass concentration of the graphene oxide aqueous solution is 2 mg/ml; the polypropylene fibers are 5-10 mm fibers, and the dispersibility of the small-size polypropylene fibers is enhanced; the reducing agent is one of ascorbic acid, hydrazine hydrate, sodium borohydride, borane ammonia, halogen acid and hydroiodic acid, and in the embodiment, the reducing agent is ascorbic acid; the graphene oxide aqueous solution is prepared by dispersing graphene oxide in deionized water, and the graphene oxide is prepared by a Hummers method, so that the prepared graphene oxide has good performance;
wherein the plasma gas treated polypropylene fiber is prepared as follows: the plasma gas treated polypropylene fibers were prepared as follows: treating the polypropylene fibers for 400s with mixed plasma gas under 80W to obtain an intermediate product; soaking the intermediate product in a dopamine solution, treating for 45min to obtain a third treated substance, repeatedly cleaning the third treated substance with deionized water for 5-10 times, and then placing at 70 ℃ for vacuum drying to obtain polypropylene fibers treated by plasma gas; wherein the mass ratio of the intermediate product to the dopamine solution is 1: 50, the mixed plasma gas consists of argon and oxygen, and the volume ratio of the argon to the oxygen is 9: 1, the mass concentration of the dopamine solution is 2 g/L;
s2, taking the chitosan quaternary ammonium salt and the second treatment substance, stirring for 3 hours in deionized water at room temperature to obtain a mixed solution, carrying out suction filtration on the mixed solution, taking filter residues, and freeze-drying to obtain the anti-cracking and anti-permeability enhancer; the mass ratio of the chitosan quaternary ammonium salt to the second treatment substance to the deionized water is 1: 2: 200 of a carrier;
preparing concrete:
preparing materials: weighing the component materials according to the parts by weight in a container, and mixing part of weighed water (about 30%) with the anti-cracking and anti-permeability enhancer.
Stirring and manufacturing: firstly putting weighed cement, fly ash, sand and stone into a concrete mixer, dry-mixing for about 15s, putting weighed water reducer and water (about 50% of the weighed water reducer and water) into the mixer, stirring for about 30s, mixing until the concrete is sufficiently fluidized, adding a mixture obtained by uniformly mixing an anti-cracking and anti-permeability reinforcing agent and water in advance, flushing a container containing the water reducer and a container containing the reinforcing agent mixture with the rest water respectively, pouring the flushing water into the mixer, stirring for 3min again until the mixture is uniformly distributed in the concrete, and finally forming and curing the stirred concrete according to a test standard of corresponding performance to obtain a concrete sample.
< example 2>
The invention provides anti-cracking and anti-permeability concrete which comprises the following components in parts by weight:
200 parts of cement, 75 parts of mineral powder, 45 parts of fly ash, 165 parts of water, 950 parts of sand, 950 parts of stone, 8.4 parts of water reducing agent and 1.0 part of anti-cracking and anti-permeability reinforcing agent;
wherein, the anti-cracking and anti-permeability reinforcing agent is prepared as follows:
s1, placing the polypropylene fiber treated by plasma gas and dopamine, the graphene oxide aqueous solution and a reducing agent into a closed container, stirring and ultrasonically treating for 20min, then placing the container at 80 ℃ for reacting for 45min to obtain a first treated object, repeatedly washing the first treated object with deionized water for 5-10 times, and then placing the first treated object at-85 ℃ for freeze drying to obtain a second treated object; wherein the mass ratio of the polypropylene fiber to the graphene oxide aqueous solution to the reducing agent is 1: 100: 1.5, wherein the mass concentration of the graphene oxide aqueous solution is 2 mg/ml; the polypropylene fibers are 5-10 mm fibers, and the dispersibility of the small-size polypropylene fibers is enhanced; the reducing agent is one of ascorbic acid, hydrazine hydrate, sodium borohydride, ammonia borane, halogen acid and hydroiodic acid, and in the embodiment, the reducing agent is hydroiodic acid; the graphene oxide aqueous solution is prepared by dispersing graphene oxide in deionized water, and the graphene oxide is prepared by a Hummers method, so that the prepared graphene oxide has good performance;
wherein the plasma treated polypropylene fiber is prepared as follows: the plasma treated polypropylene fibers were prepared as follows: treating the polypropylene fibers for 400s with mixed plasma gas under 80W to obtain an intermediate product; soaking the intermediate product in a dopamine solution, treating for 45min to obtain a third treated substance, repeatedly cleaning the third treated substance with deionized water for 5-10 times, and then placing at 70 ℃ for vacuum drying to obtain polypropylene fibers treated by plasma gas; wherein the mass ratio of the intermediate product to the dopamine solution is 1: 50, the mixed plasma gas consists of argon and oxygen, and the volume ratio of the argon to the oxygen is 9: 1, the mass concentration of the dopamine solution is 2 g/L;
s2, taking the chitosan quaternary ammonium salt and the second treatment substance, stirring for 3 hours in deionized water at room temperature to obtain a mixed solution, carrying out suction filtration on the mixed solution, taking filter residues, and freeze-drying to obtain the anti-cracking and anti-permeability enhancer; the mass ratio of the chitosan quaternary ammonium salt to the second treatment substance to the deionized water is 1: 2: 200 of a carrier;
preparing concrete:
preparing materials: weighing the component materials according to the parts by weight in a container, and mixing part of weighed water (about 30%) with the anti-cracking and anti-permeability enhancer.
Stirring and manufacturing: firstly putting weighed cement, fly ash, sand and stone into a concrete mixer, dry-mixing for about 15s, putting weighed water reducer and water (about 50% of the weighed water reducer and water) into the mixer, stirring for about 30s, mixing until the concrete is sufficiently fluidized, adding a mixture obtained by uniformly mixing an anti-cracking and anti-permeability reinforcing agent and water in advance, flushing a container containing the water reducer and a container containing the reinforcing agent mixture with the rest water respectively, pouring the flushing water into the mixer, stirring for 3min again until the mixture is uniformly distributed in the concrete, and finally forming and curing the stirred concrete according to a test standard of corresponding performance to obtain a concrete sample.
< example 3>
The invention provides anti-cracking and anti-permeability concrete which comprises the following components in parts by weight:
200 parts of cement, 70 parts of mineral powder, 50 parts of fly ash, 165 parts of water, 950 parts of sand, 960 parts of stone, 8.8 parts of water reducing agent, 1.2 parts of anti-cracking and anti-permeability reinforcing agent and 0.18 part of nano alumina;
wherein, the anti-cracking and anti-permeability reinforcing agent is prepared as follows:
s1, placing the polypropylene fiber treated by the plasma gas, the graphene oxide aqueous solution and the reducing agent in a closed container, stirring and ultrasonically treating for 20min, then placing the container at 80 ℃ for reacting for 45min to obtain a first treatment object, repeatedly washing the first treatment object with deionized water for 5-10 times, and then placing the first treatment object at-85 ℃ for freeze drying to obtain a second treatment object; wherein the mass ratio of the polypropylene fiber to the graphene oxide aqueous solution to the reducing agent is 1: 100: 1.5, wherein the mass concentration of the graphene oxide aqueous solution is 2 mg/ml; the polypropylene fibers are 5-10 mm fibers, and the dispersibility of the small-size polypropylene fibers is enhanced; the reducing agent is one of ascorbic acid, hydrazine hydrate, sodium borohydride, borane ammonia, halogen acid and hydroiodic acid, and in the embodiment, the reducing agent is ascorbic acid; the graphene oxide aqueous solution is prepared by dispersing graphene oxide in deionized water, and the graphene oxide is prepared by a Hummers method, so that the prepared graphene oxide has good performance;
wherein the plasma treated polypropylene fiber is prepared as follows: the plasma treated polypropylene fibers were prepared as follows: treating the polypropylene fibers for 400s with mixed plasma gas under 80W to obtain an intermediate product; soaking the intermediate product in a dopamine solution, treating for 45min to obtain a third treated substance, repeatedly cleaning the third treated substance with deionized water for 5-10 times, and then placing at 70 ℃ for vacuum drying to obtain polypropylene fibers treated by plasma gas; wherein the mass ratio of the intermediate product to the dopamine solution is 1: 50, the mixed plasma gas consists of argon and oxygen, and the volume ratio of the argon to the oxygen is 9: 1, the mass concentration of the dopamine solution is 2 g/L;
s2, taking the chitosan quaternary ammonium salt and the second treatment substance, stirring for 3 hours in deionized water at room temperature to obtain a mixed solution, carrying out suction filtration on the mixed solution, taking filter residues, and freeze-drying to obtain the anti-cracking and anti-permeability enhancer; the mass ratio of the chitosan quaternary ammonium salt to the second treatment substance to the deionized water is 1: 2: 200 of a carrier;
preparing concrete: dividing water into two parts, wherein one part is used for dissolving the water reducing agent, and the other part is used for mixing with the nano aluminum oxide and the anti-cracking and anti-permeability reinforcing agent; weighing a certain amount of cement, fly ash, sand and stone according to the mixture ratio, pouring the weighed cement, fly ash, sand and stone into a concrete mixer, dry-mixing for 5min, then weighing a water reducing agent, adding water to dissolve the water reducing agent, uniformly stirring the mixture, pouring the mixture into the mixer, stirring the mixture again until the concrete is fully fluidized, adding a mixture which is formed by uniformly mixing the anti-cracking and anti-permeability reinforcing agent, the nano-alumina and the water in advance, stirring the mixture until the mixture is uniformly distributed in the concrete, and finally forming and curing the stirred concrete according to test standards of corresponding performances to obtain a concrete sample.
< comparative example 1>
The comparative example does not contain an anti-cracking and anti-permeability reinforcing agent, and the rest is the same as the example 1.
< comparative example 2>
In this comparative example, polypropylene fibers without any treatment were directly added to concrete, and the rest was the same as in example 1.
< comparative example 3>
This comparative example differs from example 1 in that the polypropylene fibers were not treated with plasma gas, and is otherwise the same as example 1.
< comparative example 4>
The comparative example is different from example 1 in that the plasma gas-treated polypropylene fiber is not treated with graphene oxide, that is, the plasma gas-treated polypropylene fiber and chitosan quaternary ammonium salt are directly stirred in deionized water at room temperature, and the rest is the same as example 1.
< comparative example 5>
This comparative example is different from example 1 in that the treatment with the quaternary ammonium salt of chitosan, i.e., the step of S2 in example 1, is not performed, and is otherwise the same as example 1.
< test example >
Determining the crack reduction coefficient in the early crack resistance of the concrete according to appendix A in T/CECS 10001-2017 anti-cracking and anti-permeability composite material for concrete; the tested concrete is the concrete samples prepared in examples 1 to 3 and comparative examples 1 to 5, and the reference concrete (i.e., the blank control group) is the group without the crack-resistant anti-permeability reinforcing agent, i.e., comparative example 1.
Measuring the compressive strength and the flexural strength of the concrete according to GB/T50081-2019 standard of mechanical property test method of common concrete;
carrying out a concrete water penetration resistance test according to GB/T50082-2009 Standard test methods for testing the long-term performance and the durability of ordinary concrete;
the shrinkage reduction rate of the concrete for 28 days and 60 days is measured according to the standard JC/T2361-2016 mortar and concrete shrinkage reducing agent, wherein the tested concrete is the concrete samples prepared in the examples 1-3 and the comparative examples 1-5, and the reference concrete (namely the blank control group) is the group without the addition of the anti-cracking and anti-permeability reinforcing agent, namely the comparative example 1;
< sample >
The concrete samples of examples 1 to 3 and comparative examples 1 to 5 were subjected to the measurement of the test indexes in the above test examples, and the specific results are shown in Table 1.
TABLE 1 COMPARATIVE TABLE OF PERFORMANCE INDICATIES OF CONCRETE SAMPLES PREPARED IN EXAMPLES AND COMPARATIONS
As can be seen from Table 1, the anti-cracking and anti-permeability concrete disclosed by the invention is superior to a comparative example in the aspects of concrete crack reduction coefficient, compressive strength, flexural strength, water seepage resistance and shrinkage rate at all ages, and the concrete disclosed by the invention has more excellent anti-cracking and anti-permeability effects; the method comprises the steps of treating polypropylene fibers by plasma gas and dopamine to enable the surfaces of the polypropylene fibers to be grafted with active groups; treating the polypropylene fiber treated by the plasma gas by using graphene oxide, wherein in the treatment process, the graphene oxide is reduced into graphene and is attached to the surface of the polypropylene fiber, so that the interface acting force between the polypropylene fiber and the concrete matrix can be enhanced; the chitosan quaternary ammonium salt is used for treating the polypropylene fiber, so that the water solubility of the polypropylene fiber can be improved, and the dispersibility of the polypropylene fiber in a concrete matrix can be improved; the data comparison of the embodiment 1 and the embodiment 3 shows that the nano-alumina and the polypropylene fiber generate a synergistic effect, the interfacial acting force of the polypropylene fiber and a concrete matrix can be further enhanced through an interfacial effect, the workability of the concrete is improved, and the strength and the impermeability of the concrete are improved; on the whole, the polypropylene fiber can obviously improve the anti-cracking and anti-permeability performance of concrete after being treated by plasma gas and dopamine, graphene oxide and chitosan quaternary ammonium salt.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.
Claims (7)
1. The anti-cracking impervious concrete is characterized by comprising the following components in parts by weight:
200-300 parts of cement, 60-100 parts of mineral powder, 30-50 parts of fly ash, 150-170 parts of water, 880-960 parts of sand, 900-980 parts of stone, 7-12 parts of water reducing agent and 0.9-1.5 parts of anti-cracking and anti-permeability reinforcing agent;
wherein, the anti-cracking and anti-permeability reinforcing agent is prepared as follows:
s1, placing plasma gas, dopamine-treated polypropylene fibers, graphene oxide aqueous solution and a reducing agent in a closed container, stirring and ultrasonically treating for 20min, then placing at 75-85 ℃ for reacting for 45min to obtain a first treatment object, repeatedly washing the first treatment object with deionized water for 5-10 times, and then placing at-85 ℃ for freeze drying to obtain a second treatment object; wherein the mass ratio of the polypropylene fiber to the graphene oxide aqueous solution to the reducing agent is 1: 100: 1-2, wherein the mass concentration of the graphene oxide aqueous solution is 2 mg/ml;
s2, taking the chitosan quaternary ammonium salt and the second treatment substance, stirring for 3 hours in deionized water at room temperature to obtain a mixed solution, carrying out suction filtration on the mixed solution, taking filter residues, and freeze-drying to obtain the anti-cracking and anti-permeability enhancer; the mass ratio of the chitosan quaternary ammonium salt to the second treatment substance to the deionized water is 1: 2: 200.
2. the anti-cracking impervious concrete according to claim 1, wherein the plasma gas-treated polypropylene fibers are prepared as follows: treating the polypropylene fibers for 400s with mixed plasma gas under 80W to obtain an intermediate product; soaking the intermediate product in a dopamine solution, treating for 45min to obtain a third treated substance, repeatedly cleaning the third treated substance with deionized water for 5-10 times, and then placing at 70 ℃ for vacuum drying to obtain polypropylene fibers treated by plasma gas; wherein the mass ratio of the intermediate product to the dopamine solution is 1: 50, the mixed plasma gas consists of argon and oxygen, and the volume ratio of the argon to the oxygen is 9: 1, the mass concentration of the dopamine solution is 2 g/L.
3. The anti-cracking impervious concrete according to claim 1, wherein the graphene oxide aqueous solution is prepared by dispersing graphene oxide in deionized water, and the graphene oxide is prepared by a Hummers method.
4. The anti-cracking and anti-permeability concrete as claimed in claim 1, wherein the polypropylene fiber is 5-10 mm fiber.
5. The anti-cracking impervious concrete according to claim 1, wherein the reducing agent is one of ascorbic acid, hydrazine hydrate, sodium borohydride, ammonia borane, halogen acid and hydroiodic acid.
6. An anti-cracking and anti-permeability concrete according to claim 5, wherein the reducing agent is ascorbic acid.
7. The anti-cracking impervious concrete according to claim 1, further comprising 0.15 to 0.2 parts by weight of nano alumina.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114790097A (en) * | 2022-04-13 | 2022-07-26 | 沙洲职业工学院 | Impermeable concrete for reservoir dam and preparation method thereof |
| CN117645393A (en) * | 2024-01-30 | 2024-03-05 | 中国矿业大学(北京) | Coal mine water treatment and resource utilization method |
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| CN114133187B (en) | 2023-05-05 |
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