CN114133187B - Anti-cracking and anti-seepage concrete - Google Patents
Anti-cracking and anti-seepage concrete Download PDFInfo
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- CN114133187B CN114133187B CN202111536079.6A CN202111536079A CN114133187B CN 114133187 B CN114133187 B CN 114133187B CN 202111536079 A CN202111536079 A CN 202111536079A CN 114133187 B CN114133187 B CN 114133187B
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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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
Abstract
The invention discloses an anti-cracking and anti-seepage concrete, which comprises the following components: 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 reducer and 0.9-1.5 parts of anti-cracking and anti-permeability reinforcing agent; the preparation of the anti-cracking and anti-permeability reinforcing agent is as follows: s1, taking polypropylene fibers treated by plasma gas, graphene oxide aqueous solution and a reducing agent, reacting for 45min to obtain a first treated object, repeatedly washing the first treated object with deionized water for 5-10 times, and then freeze-drying to obtain a second treated object; s2, taking chitosan quaternary ammonium salt and a second treatment substance, stirring the chitosan quaternary ammonium salt and the second treatment substance in deionized water for 3 hours at room temperature to obtain a mixed solution, and freeze-drying the mixed solution to obtain the anti-cracking and anti-permeability reinforcing agent. According to the invention, the polypropylene fiber is modified by using the plasma gas and the graphene, so that the prepared concrete has strong anti-cracking and anti-permeability properties and good application prospects.
Description
Technical Field
The invention relates to the field of concrete. More particularly, the present invention relates to an anti-cracking and anti-permeation concrete.
Background
With the development of economy, underground engineering is gradually one of main melodies of modern development, wherein the crack resistance and seepage resistance of concrete are main factors for restricting the durability of the underground engineering. In the prior art, fibers are often added to concrete to improve its crack and barrier properties. The common fibers include polypropylene fibers, glass fibers, carbon fibers and the like, and particularly polypropylene fibers are most widely used. However, when the polypropylene fiber is applied to concrete, the interfacial effect between the polypropylene fiber and the concrete is not strong enough, and the anti-cracking and anti-permeability effects are affected.
Disclosure of Invention
It is an object of the present invention to solve at least the above problems and to provide at least the advantages to be described later.
The invention also aims to provide the anti-cracking and anti-permeability concrete and the preparation method thereof, wherein the polypropylene fiber is modified by using the graphene, so that the graphene is attached to the polypropylene fiber, the interfacial acting force of the graphene in the concrete is improved, then the polypropylene fiber modified by the graphene is treated by using the chitosan quaternary ammonium salt, the water solubility and the dispersibility of the polypropylene fiber are improved, and finally the anti-cracking and anti-permeability performance of the concrete doped with the polypropylene fiber is improved.
To achieve these objects and other advantages and in accordance with the purpose of the invention, there is provided an anti-cracking and anti-permeation concrete and a preparation method thereof, 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 reducer and 0.9-1.5 parts of anti-cracking and anti-permeability reinforcing agent;
wherein, the preparation of the anti-cracking and anti-permeability reinforcing agent is as follows:
s1, placing polypropylene fibers treated by plasma gas, a dopamine, a graphene oxide aqueous solution and a reducing agent in a closed container, stirring and carrying out ultrasonic treatment for 20min, then placing the mixture at 75-85 ℃ for reaction 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: 1-2, wherein the mass concentration of the graphene oxide aqueous solution is 2mg/ml;
s2, taking chitosan quaternary ammonium salt and a second treatment substance, stirring in deionized water for 3 hours at room temperature to obtain a mixed solution, carrying out suction filtration on the mixed solution, and freeze-drying filter residues to obtain the anti-cracking and anti-permeability reinforcing agent; the mass ratio of the chitosan quaternary ammonium salt to the second treated matter to the deionized water is 1:2:200.
preferably, the plasma treated polypropylene fiber is prepared as follows: treating the polypropylene fiber with the mixed plasma gas at 80W for 400s 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 the third treated substance in a vacuum drying mode at 70 ℃ to obtain the polypropylene fiber 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, wherein the volume ratio of the argon to the oxygen is 9:1, wherein the mass concentration of the dopamine solution is 2g/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 fibers are 5 to 10mm fibers.
Preferably, the reducing agent is one of ascorbic acid, hydrazine hydrate, sodium borohydride, borane ammonia, halogen acid and hydroiodic acid.
Preferably, the reducing agent is ascorbic acid.
Preferably, the nano alumina comprises 0.15-0.2 parts by weight.
The invention at least comprises the following beneficial effects:
the invention provides an 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 interfacial acting force of the graphene in the concrete is improved, then chitosan quaternary ammonium salt is used for treating the polypropylene fibers modified by the graphene, the water solubility and the dispersibility of the polypropylene fibers are improved, and finally the anti-cracking and anti-permeability performance of the concrete doped with the polypropylene fibers is 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 described in further detail below with reference to examples to enable those skilled in the art to practice the same by referring to the description.
Example 1 ]
The invention provides an anti-cracking and anti-seepage 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 reducer and 1.2 parts of anti-cracking and anti-seepage 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 sand in a zone II; the stone is artificial broken stone with the diameter of 5-25 mm, and the stone is continuously graded; the water reducer is an AF-CA polycarboxylic acid high-efficiency water reducer;
wherein, the preparation of the anti-cracking and anti-permeability reinforcing agent is as follows:
s1, placing polypropylene fibers treated by plasma gas, a dopamine, a graphene oxide aqueous solution and a reducing agent in a closed container, stirring and carrying out ultrasonic treatment for 20min, then placing the mixture at 80 ℃ for reaction 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, the mass concentration of the graphene oxide aqueous solution is 2mg/ml; the polypropylene fiber is 5-10 mm fiber, and the dispersibility of the small-size polypropylene fiber is enhanced; the reducing agent is one of ascorbic acid, hydrazine hydrate, sodium borohydride, borane ammonia, hydrohalic 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 preparation of the polypropylene fiber treated by the plasma gas is as follows: the preparation of the polypropylene fiber treated by the plasma gas is as follows: treating the polypropylene fiber with the mixed plasma gas at 80W for 400s 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 the third treated substance in a vacuum drying mode at 70 ℃ to obtain the polypropylene fiber 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, wherein the volume ratio of the argon to the oxygen is 9:1, the mass concentration of the dopamine solution is 2g/L;
s2, taking chitosan quaternary ammonium salt and a second treatment substance, stirring in deionized water for 3 hours at room temperature to obtain a mixed solution, carrying out suction filtration on the mixed solution, and freeze-drying filter residues to obtain the anti-cracking and anti-permeability reinforcing agent; the mass ratio of the chitosan quaternary ammonium salt to the second treated matter to the deionized water is 1:2:200;
and (3) preparing concrete:
preparing materials: according to the above components, the materials of each component are weighed according to the weight by a container, and a part of weighed water (about 30%) is mixed with the anti-cracking and anti-permeability reinforcing agent.
Stirring and manufacturing: firstly, putting the weighed cement, fly ash, sand and stone into a concrete mixer, dry-mixing for about 15s, putting the weighed water reducer and water (the amount of which is about 50 percent) into the mixer, stirring for about 30s, stirring until the concrete is fully fluidized, then adding a mixture which is obtained by uniformly mixing an anti-cracking and anti-permeability reinforcing agent and water in advance, respectively flushing a container for containing the water reducer and a container for containing the reinforcing agent mixture by using the rest water, pouring flushing water into the mixer, stirring for 3min again until the mixture is uniformly distributed in the concrete, and finally molding and curing the stirred concrete according to the test standard of the corresponding performance to obtain a concrete sample.
Example 2 ]
The invention provides an anti-cracking and anti-seepage 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 reducer and 1.0 part of anti-cracking and anti-seepage reinforcing agent;
wherein, the preparation of the anti-cracking and anti-permeability reinforcing agent is as follows:
s1, placing polypropylene fibers treated by plasma gas, a dopamine, a graphene oxide aqueous solution and a reducing agent in a closed container, stirring and carrying out ultrasonic treatment for 20min, then placing the mixture at 80 ℃ for reaction 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, the mass concentration of the graphene oxide aqueous solution is 2mg/ml; the polypropylene fiber is 5-10 mm fiber, and the dispersibility of the small-size polypropylene fiber is enhanced; the reducing agent is one of ascorbic acid, hydrazine hydrate, sodium borohydride, borane ammonia, hydrohalic 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 preparation of the plasma treated polypropylene fiber is as follows: treating the polypropylene fiber with the mixed plasma gas at 80W for 400s 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 the third treated substance in a vacuum drying mode at 70 ℃ to obtain the polypropylene fiber 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, wherein the volume ratio of the argon to the oxygen is 9:1, the mass concentration of the dopamine solution is 2g/L;
s2, taking chitosan quaternary ammonium salt and a second treatment substance, stirring in deionized water for 3 hours at room temperature to obtain a mixed solution, carrying out suction filtration on the mixed solution, and freeze-drying filter residues to obtain the anti-cracking and anti-permeability reinforcing agent; the mass ratio of the chitosan quaternary ammonium salt to the second treated matter to the deionized water is 1:2:200;
and (3) preparing concrete:
preparing materials: according to the above components, the materials of each component are weighed according to the weight by a container, and a part of weighed water (about 30%) is mixed with the anti-cracking and anti-permeability reinforcing agent.
Stirring and manufacturing: firstly, putting the weighed cement, fly ash, sand and stone into a concrete mixer, dry-mixing for about 15s, putting the weighed water reducer and water (the amount of which is about 50 percent) into the mixer, stirring for about 30s, stirring until the concrete is fully fluidized, then adding a mixture which is obtained by uniformly mixing an anti-cracking and anti-permeability reinforcing agent and water in advance, respectively flushing a container for containing the water reducer and a container for containing the reinforcing agent mixture by using the rest water, pouring flushing water into the mixer, stirring for 3min again until the mixture is uniformly distributed in the concrete, and finally molding and curing the stirred concrete according to the test standard of the corresponding performance to obtain a concrete sample.
Example 3 ]
The invention provides an anti-cracking and anti-seepage 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 reducer, 1.2 parts of anti-cracking and anti-permeability reinforcing agent and 0.18 part of nano alumina;
wherein, the preparation of the anti-cracking and anti-permeability reinforcing agent is as follows:
s1, placing polypropylene fibers treated by plasma gas, graphene oxide aqueous solution and a reducing agent in a closed container, stirring and carrying out ultrasonic treatment for 20min, then placing the mixture at 80 ℃ for reaction 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, the mass concentration of the graphene oxide aqueous solution is 2mg/ml; the polypropylene fiber is 5-10 mm fiber, and the dispersibility of the small-size polypropylene fiber is enhanced; the reducing agent is one of ascorbic acid, hydrazine hydrate, sodium borohydride, borane ammonia, hydrohalic 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 preparation of the plasma treated polypropylene fiber is as follows: treating the polypropylene fiber with the mixed plasma gas at 80W for 400s 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 the third treated substance in a vacuum drying mode at 70 ℃ to obtain the polypropylene fiber 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, wherein the volume ratio of the argon to the oxygen is 9:1, the mass concentration of the dopamine solution is 2g/L;
s2, taking chitosan quaternary ammonium salt and a second treatment substance, stirring in deionized water for 3 hours at room temperature to obtain a mixed solution, carrying out suction filtration on the mixed solution, and freeze-drying filter residues to obtain the anti-cracking and anti-permeability reinforcing agent; the mass ratio of the chitosan quaternary ammonium salt to the second treated matter to the deionized water is 1:2:200;
and (3) preparing concrete: dividing water into two parts, wherein one part is used for dissolving a water reducing agent, and the other part is used for mixing with a nano alumina, an anti-cracking and anti-permeation reinforcing agent; according to the proportion of the components, a certain amount of cement, fly ash, sand and stone are weighed and poured into a concrete mixer to be dry-mixed for 5min, then a water reducing agent is weighed and added with water to be dissolved, after being uniformly stirred, the mixture is poured into the mixer to be fully fluidized, then a mixture which is obtained by uniformly mixing an anti-cracking and anti-permeability reinforcing agent, nano alumina and water in advance is added, the mixture is stirred until the mixture is uniformly distributed in the concrete, and finally the stirred concrete is molded and maintained according to the test standard of corresponding performance, thus obtaining a concrete sample.
Comparative example 1 ]
The comparative example was conducted in the same manner as in example 1 except that no anti-cracking and anti-permeation enhancer was added.
Comparative example 2 ]
In this comparative example, polypropylene fibers which were not subjected to any treatment were directly added to concrete, and the other was the same as in example 1.
Comparative example 3 ]
This comparative example is different from example 1 in that the polypropylene fiber is not treated with a plasma gas, and otherwise is the same as example 1.
Comparative example 4 ]
This comparative example was different from example 1 in that the plasma gas treated polypropylene fiber was not treated with graphene oxide, i.e., the plasma gas treated polypropylene fiber and chitosan quaternary ammonium salt were directly stirred in deionized water at room temperature, and otherwise the same as in example 1.
Comparative example 5 ]
This comparative example differs from example 1 in that the treatment with chitosan quaternary ammonium salt was not performed, i.e., step S2 in example 1 was not included, and otherwise the same as example 1.
< test example >
The crack reduction coefficient in the early cracking resistance of the concrete is measured according to annex A in T/CECS 10001-2017, anti-cracking and anti-permeability composite material for concrete; among them, the test concrete was the concrete samples prepared in examples 1 to 3 and comparative examples 1 to 5, and the reference concrete (i.e., the blank group) was the group to which no anti-cracking and anti-permeation enhancer was added, i.e., comparative example 1.
Measuring the compressive strength and the flexural strength of the concrete according to GB/T50081-2019 standard of a common concrete mechanical property test method;
performing a concrete water penetration resistance test according to GB/T50082-2009 Standard for test methods for ordinary concrete Long-term Performance and durability;
the shrinkage of concrete for 28 days and 60 days was measured according to JC/T2361-2016 Standard of mortar and concrete shrinkage reducing agent, wherein the tested concrete is the concrete sample prepared in examples 1-3 and comparative examples 1-5, and the reference concrete (i.e. blank control group) is the group without adding anti-cracking and anti-permeability reinforcing agent, i.e. comparative example 1;
< sample >
Concrete samples of examples 1 to 3 and comparative examples 1 to 5 were taken and the test indexes in the above test examples were measured, and the specific results are shown in Table 1.
Table 1 comparison of performance index of concrete samples prepared in examples and comparative examples
As can be seen from Table 1, the anti-cracking and anti-seepage concrete disclosed by the invention is superior to the comparative example in terms of concrete crack reduction coefficient, compressive strength at each age, flexural strength, water seepage resistance and reduction rate, and the concrete disclosed by the invention has more excellent anti-cracking and anti-seepage effects; the invention firstly treats the polypropylene fiber through plasma gas and dopamine, so that active groups are grafted on the surface of the polypropylene fiber; the polypropylene fiber treated by the plasma gas is treated by the graphene oxide, and in the treatment process, the graphene oxide is reduced into graphene and is attached to the surface of the polypropylene fiber, so that the interfacial 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; as can be seen from the comparison of the data in the embodiment 1 and the embodiment 3, the nano alumina and the polypropylene fiber generate a synergistic effect, and the interfacial force between the polypropylene fiber and the concrete matrix can be further enhanced by the interfacial effect, so that the workability of the concrete is improved, and the strength and the impermeability of the concrete are improved; in the whole, the polypropylene fiber can obviously improve the anti-cracking and anti-permeability performance of the concrete after being treated by plasma gas and dopamine, graphene oxide and chitosan quaternary ammonium salt.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown, it is well suited to various fields of use for which the invention is suited, and further modifications may be readily made by one skilled in the art, and the invention is therefore not to be limited to the particular details and examples shown and described herein, without departing from the general concepts defined by the claims and the equivalents thereof.
Claims (6)
1. The anti-cracking and anti-seepage 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 reducer and 0.9-1.5 parts of anti-cracking and anti-permeability reinforcing agent;
wherein, the preparation of the anti-cracking and anti-permeability reinforcing agent is as follows:
s1, placing polypropylene fibers treated by plasma gas, a dopamine, a graphene oxide aqueous solution and a reducing agent in a closed container, stirring and carrying out ultrasonic treatment for 20min, then placing the mixture at 75-85 ℃ for reaction 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: 1-2, wherein the mass concentration of the graphene oxide aqueous solution is 2mg/ml;
s2, taking chitosan quaternary ammonium salt and a second treatment substance, stirring in deionized water for 3 hours at room temperature to obtain a mixed solution, carrying out suction filtration on the mixed solution, and freeze-drying filter residues to obtain the anti-cracking and anti-permeability reinforcing agent; the mass ratio of the chitosan quaternary ammonium salt to the second treated matter to the deionized water is 1:2:200;
the preparation of the polypropylene fiber treated by the plasma gas is as follows: treating the polypropylene fiber with the mixed plasma gas at 80W for 400s 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 the third treated substance in a vacuum drying mode at 70 ℃ to obtain the polypropylene fiber 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, wherein the volume ratio of the argon to the oxygen is 9:1, wherein the mass concentration of the dopamine solution is 2g/L.
2. The anti-cracking and anti-permeation 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.
3. The anti-cracking and anti-permeability concrete according to claim 1, wherein the polypropylene fibers are 5 to 10mm fibers.
4. The anti-cracking and anti-permeability concrete according to claim 1, wherein the reducing agent is one of ascorbic acid, hydrazine hydrate, sodium borohydride, borane ammonia, hydrohalic acid, hydroiodic acid.
5. The anti-cracking and anti-permeability concrete according to claim 4, wherein the reducing agent is ascorbic acid.
6. The anti-cracking and anti-seepage concrete according to claim 1, further comprising 0.15-0.2 parts by weight of nano-alumina.
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| CN202111536079.6A CN114133187B (en) | 2021-12-15 | 2021-12-15 | Anti-cracking and anti-seepage concrete |
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| CN114133187B true CN114133187B (en) | 2023-05-05 |
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