CN115159910B - Preparation method and application of high-strength waterproof concrete for building construction - Google Patents

Preparation method and application of high-strength waterproof concrete for building construction Download PDF

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CN115159910B
CN115159910B CN202211091965.7A CN202211091965A CN115159910B CN 115159910 B CN115159910 B CN 115159910B CN 202211091965 A CN202211091965 A CN 202211091965A CN 115159910 B CN115159910 B CN 115159910B
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stirring
parts
building construction
strength waterproof
waterproof concrete
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CN115159910A (en
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陈俊祥
陈锴洲
郑少蔚
刘键涛
陈子东
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Guangdong Chaotai Construction Co ltd
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Guangdong Chaotai Construction Co ltd
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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
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/04—Silica-rich materials; Silicates
    • C04B14/10—Clay
    • C04B14/106—Kaolin
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/38—Fibrous materials; Whiskers
    • C04B14/46—Rock wool ; Ceramic or silicate fibres
    • C04B14/4643—Silicates other than zircon
    • 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
    • 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
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/023—Chemical treatment
    • 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
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/10—Coating or impregnating
    • C04B20/1051—Organo-metallic compounds; Organo-silicon compounds, e.g. bentone
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/08—Acids or salts thereof
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/08—Acids or salts thereof
    • C04B22/14—Acids or salts thereof containing sulfur in the anion, e.g. sulfides
    • C04B22/142—Sulfates
    • C04B22/147—Alkali-metal sulfates; Ammonium sulfate
    • 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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/04—Carboxylic acids; Salts, anhydrides or esters thereof
    • C04B24/06—Carboxylic acids; Salts, anhydrides or esters thereof containing hydroxy groups
    • 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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/24—Macromolecular compounds
    • C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B24/281—Polyepoxides
    • 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
    • C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
    • C04B24/40—Compounds containing silicon, titanium or zirconium or other organo-metallic compounds; Organo-clays; Organo-inorganic complexes
    • C04B24/42—Organo-silicon compounds
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/27—Water resistance, i.e. waterproof or water-repellent materials
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Abstract

The invention relates to the technical field of concrete, and discloses a preparation method and application of high-strength waterproof concrete for building construction. The preparation method of the high-strength waterproof concrete for building construction comprises the following steps: preparing hydroxylated polypropylene fibers; (2) carrying out modification treatment on the basalt fibers; (3) Carrying out surface modification on metakaolin by using hydroxylated polypropylene fibers, modified basalt fibers, salicylic acid and a silane coupling agent; (4) Mixing fly ash, diluted epoxy resin, sand, cement, stone, sodium citrate, sodium sulfate, aluminum silicate, sodium methyl silicate, modified metakaolin, an expanding agent, a compacting agent, a water reducing agent, a defoaming agent and water, and stirring. The high-strength waterproof concrete for building construction has excellent mechanical property and waterproof property.

Description

Preparation method and application of high-strength waterproof concrete for building construction
Technical Field
The invention relates to the technical field of concrete, in particular to a preparation method and application of high-strength waterproof concrete for building construction.
Background
In national infrastructure projects such as buildings, municipal administration, traffic, water conservancy and the like, all countries in the world can not leave concrete, and the concrete plays a non-negligible role in construction. Brick concrete structures and reinforced concrete structures still occupy the leading position in the building industry of China for a period of time in the future. The common concrete is cement concrete, also called common concrete, which is obtained by mixing cement, water, sand, stones and additives (optionally containing the additives and admixture) according to a certain proportion and stirring, and has been widely applied to civil engineering along with the development of the construction industry, but the existing common concrete can not meet the engineering requirement of high strength along with the expansion of the application range of the concrete. In addition, the problem of concrete engineering structure leakage is a great problem in the building industry, and the concrete structure leakage not only needs to consume a great deal of manpower and material resources for repairing, but also brings great inconvenience to daily life, and even has an influence on the life health of people in serious cases. Therefore, the concrete with high strength and high waterproofness has wide application prospect.
For example, patent application CN106277963A discloses a high strength waterproof concrete, which comprises, by weight, 100-120 parts of cement, 80-85 parts of coarse aggregate, 90-100 parts of fine aggregate, 20-25 parts of bentonite, 20-25 parts of asphalt powder, 2-5 parts of sodium alkylsulfonate, 2-3 parts of copper sulfate, 10-12 parts of basalt fiber, 5-8 parts of polypropylene fiber, 2-3 parts of lace fiber, 0.2-0.5 part of perfluorooctyl sodium sulfonate, 0.1-0.2 part of coconut diethanolamide, 0.5-1 part of bisphenol a epoxy resin, 0.1-0.2 part of styrylphenol polyoxyethylene ether, 3-5 parts of ferric chloride, 0.2-0.5 part of phenyl salicylate, 2-5 parts of aluminum potassium sulfate, 1,6-hexamethylene diisocyanate, and a proper amount of water, wherein basalt fiber and polypropylene fiber are added to the concrete to influence the dispersibility of the concrete, but the performance of the concrete is directly influenced by the cement.
Disclosure of Invention
In order to solve the technical problems, the invention provides a preparation method of high-strength waterproof concrete for building construction, which comprises the following steps:
step (1) preparation of hydroxylated polypropylene fiber: soaking the polypropylene fiber after cleaning treatment in a sulfuric acid aqueous solution to obtain polypropylene fiber with a rough surface; sequentially adding the polypropylene fibers with rough surfaces into aqueous solution of 2wt%, 5wt% and 10wt% of hydrogen peroxide, heating and stirring to obtain hydroxylated polypropylene fibers;
preparing the modified basalt fiber in the step (2): mixing the pretreated basalt fibers, an aminosilane coupling agent, ethanol and deionized water, heating and stirring to obtain modified basalt fibers;
preparing modified metakaolin in the step (3): adding metakaolin and a silane coupling agent into an ethanol water solution, stirring, adding hydroxylated polypropylene fibers, stirring, adding salicylic acid and modified basalt fibers, and stirring to obtain modified metakaolin;
step (4) preparation of high-strength waterproof concrete for building construction: mixing and stirring the fly ash, the diluted epoxy resin, the sand, the cement, the stone, the sodium citrate, the sodium sulfate, the aluminum silicate, the sodium methyl silicate, the modified metakaolin, the expanding agent, the compacting agent, the water reducing agent, the defoaming agent and the water to obtain the high-strength waterproof concrete for building construction.
The invention also provides a preparation method of the high-strength waterproof concrete brick for building construction, which comprises the following steps:
step (1) preparation of hydroxylated polypropylene fiber: soaking the cleaned polypropylene fiber in a sulfuric acid aqueous solution to obtain polypropylene fiber with a rough surface; sequentially adding the polypropylene fibers with rough surfaces into aqueous solution of 2wt%, 5wt% and 10wt% of hydrogen peroxide, heating and stirring to obtain hydroxylated polypropylene fibers;
preparing the modified basalt fiber in the step (2): mixing the pretreated basalt fiber, an aminosilane coupling agent, ethanol and deionized water, heating and stirring to obtain a modified basalt fiber;
preparing the modified metakaolin in the step (3): adding metakaolin and a silane coupling agent into an ethanol water solution, stirring, adding hydroxylated polypropylene fiber and salicylic acid, stirring, adding modified basalt fiber, and stirring to obtain modified metakaolin;
step (4), preparing high-strength waterproof concrete for building construction: mixing and stirring fly ash, diluted epoxy resin, sand, cement, stone, sodium citrate, sodium sulfate, aluminum silicate, sodium methyl silicate, modified metakaolin, an expanding agent, a compacting agent, a water reducing agent, a defoaming agent and water to obtain the high-strength waterproof concrete for building construction;
step (5), stirring the high-strength waterproof concrete for building construction at the rotating speed of 800r/min for 5min, and pouring the mixture into a brick model of a carbon dioxide protection chamber; and vacuumizing the interior of the carbon dioxide guard chamber, filling carbon dioxide with the concentration of 100%, controlling the introduction amount of the carbon dioxide to enable the pressure in the carbon dioxide guard chamber to be 0.6Bar, and maintaining for 4 hours to obtain the high-strength waterproof concrete brick for building.
Preferably, the cleaning treatment of the polypropylene fiber in the step (1) comprises: soaking the polypropylene fiber in 40-60% acetone water solution for 1h, soaking in 20-30% ethanol water solution for 1h, and ultrasonically cleaning in deionized water for 20min at the ultrasonic frequency of 150kHz and the ultrasonic power of 1000W to obtain the cleaned polypropylene fiber.
Preferably, the preparation of the polypropylene fiber with rough surface in the step (1) comprises: soaking the cleaned polypropylene fiber in 30-50wt% sulfuric acid water solution for 1.5h, washing with 20-30% ethanol water solution by volume fraction for 3 times, washing with deionized water for 3 times, and drying at 60-80 deg.C for 6-12h to obtain polypropylene fiber with rough surface.
Preferably, the preparation of the hydroxylated polypropylene fiber in step (1) comprises: sequentially adding the polypropylene fibers with rough surfaces into aqueous solutions of 2wt%, 5wt% and 10wt% of hydrogen peroxide, respectively reacting for 2-3h at the temperature of 95-100 ℃ and at the stirring speed of 3000r/min, washing for 3 times by using deionized water after the reaction is finished, and drying for 4-6h at the temperature of 40-60 ℃ to obtain hydroxylated polypropylene fibers; wherein 0.2g of polypropylene fiber with rough surface is added into each milliliter of aqueous solution of hydrogen peroxide.
Preferably, the pretreatment of basalt fiber in the step (2) includes: mixing basalt fibers with 40-60% by volume of acetone aqueous solution according to the proportion of 1:20, heating to 80-100 ℃, condensing and refluxing for 12-48h to obtain the basalt fiber with surface impurities removed, washing with deionized water for 3 times, and drying at 80 ℃ for 6h to obtain the pretreated basalt fiber.
Preferably, the preparation of the modified basalt fiber in the step (2) comprises: pre-treated basalt fibers, an aminosilane coupling agent, ethanol and deionized water are mixed according to the weight ratio of 100:1:4: (0.1-0.5), reacting for 2-4h at the temperature of 50-70 ℃ and the stirring rate of 3000r/min, washing for 4 times by using deionized water after the reaction is finished, and drying for 5h at the temperature of 100 ℃ to obtain the modified basalt fiber; wherein the aminosilane coupling agent comprises at least one of 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropylmethyldiethoxysilane or 3- [2- (2-aminoethylamino) ethylamino ] propyl-trimethoxysilane.
Preferably, the preparation of the modified metakaolin in the step (3) comprises: mixing ethanol and deionized water according to the weight ratio of 4: (0.1-0.5), adding 0.1mol/L HCl aqueous solution until the pH of the solution is 4-5 to obtain ethanol aqueous solution; adding metakaolin and a silane coupling agent into the ethanol aqueous solution, stirring for 30min at the constant temperature of 30 ℃ and the rotating speed of 3000r/min, adding hydroxylated polypropylene fiber, stirring for 30min at the constant temperature of 30 ℃ and the rotating speed of 3000r/min, adding salicylic acid and modified basalt fiber, stirring for 1h at the constant temperature of 30 ℃ and the rotating speed of 3000r/min to obtain a dispersion liquid, filtering the dispersion liquid, drying a filtered product for 24h at the temperature of 85 ℃, and grinding for 1h to obtain modified metakaolin; wherein the mass ratio of the metakaolin, the silane coupling agent, the salicylic acid, the hydroxylated polypropylene fiber and the modified basalt fiber is 1:0.06:0.004:0.03:0.03; the mass ratio of the silane coupling agent to the ethanol aqueous solution is 1:100, respectively; the silane coupling agent comprises at least one of 3-aminopropyltriethoxysilane and 3-aminopropyltrimethoxysilane.
Preferably, the preparation of the high-strength waterproof concrete for building construction in the step (4) includes: mixing 60-80 parts of fly ash and 40-60 parts of epoxy resin diluted by heating to 40-60 ℃ in parts by mass, stirring for 10-20min under the condition of stirring speed of 1000rpm, adding 600-700 parts of sand, and stirring for 5-10min under the condition of stirring speed of 1000 rpm; then adding 250-350 parts of cement and 1000-1200 parts of stone, and stirring for 20-30min under the condition that the stirring speed is 1000 rpm; then adding 0.12-0.18 part of sodium citrate, 1-1.4 parts of sodium sulfate, 0.75-1.05 parts of aluminum silicate, 0.25-0.35 part of methyl sodium silicate, 30-50 parts of modified metakaolin, 1.25-2.5 parts of expanding agent, 5-7 parts of compacting agent, 5-10 parts of water reducing agent, 0.1-0.5 part of defoaming agent and 140-160 parts of water, and stirring for 30-60min under the condition that the stirring speed is 800rpm to obtain the high-strength waterproof concrete for building construction; the epoxy resin is bisphenol A epoxy resin, and the diluent for diluting the bisphenol A epoxy resin comprises one or more of benzyl alcohol, toluene and xylene, and the diluent is diluted by 70 parts by mass per 100 parts by mass of the bisphenol A epoxy resin.
Compared with the prior art, the invention has the beneficial effects that:
(1) The basalt fibers and the polypropylene fibers are added into the high-strength waterproof concrete for building construction, and the basalt fibers not only have high strength, but also have various excellent performances of electrical insulation, corrosion resistance, high temperature resistance and the like, so that the structural strength and the safety performance of the concrete can be effectively enhanced; the polypropylene fiber has the advantages of high strength, good toughness, good chemical resistance and antimicrobial property, low price and the like, can be used as a filling material of concrete, plaster and the like, and improves the impact resistance, water resistance and heat insulation of the concrete; furthermore, the invention utilizes aminosilane coupling agent to modify basalt fiber, amino is accessed to the surface of basalt fiber, hydroxyl on salicylic acid is bonded with hydroxyl on metakaolin to graft salicylic acid on metakaolin, and the amino accessed to the surface of basalt fiber is combined with carboxyl in the salicylic acid grafted on metakaolin through electrostatic adsorption; the polypropylene fiber is subjected to surface roughening treatment under the action of sulfuric acid to obtain the polypropylene fiber with rough surface, the specific surface area of the polypropylene fiber is increased, more hydroxyl groups are introduced on the surface of the polypropylene fiber, and the hydroxyl groups introduced on the surface of the polypropylene fiber can be bonded with hydroxyl groups on metakaolin and hydroxyl groups in bisphenol A type epoxy resin, so that the problems of poor compatibility and poor bonding effect of the polypropylene fiber and basalt fiber with a concrete system can be solved, and a crosslinking system can be formed to improve the mechanical property and the waterproof property of the concrete; in addition, the concrete is a brittle material, the development of concrete cracks can be limited to a certain extent by adding the polypropylene fibers and the basalt fibers, and the concrete is prevented from generating large cracks;
(2) Metakaolin has high volcanic ash activity, the active ingredients of metakaolin react with calcium hydroxide precipitated by cement hydration to generate hydrated gehlenite and secondary C-S-H gel with gel property, and the hydration products enhance the compression resistance, bending resistance and splitting tensile strength of concrete; in addition, metakaolin with a layered structure is filled in gaps among cement sands and stones, so that the entry of moisture can be blocked, and the moisture stroke can be prolonged; according to the invention, the metakaolin is subjected to surface modification, hydroxyl in salicylic acid, hydroxyl in hydroxylated polypropylene fibers and hydroxyl in silanol after hydrolysis of a silane coupling agent can be dehydrated and bonded with the hydroxyl on the surface of the metakaolin, the compatibility between the modified metakaolin and epoxy resin is improved, and further carboxyl in the salicylic acid can be electrostatically adsorbed with amino in modified basalt fibers, so that an intricate network structure is formed; the silane coupling agent is grafted on the surface of metakaolin, so that the activity of the metakaolin is improved, and a coupling agent monomolecular layer is formed on the surface of metakaolin particles, so that the water consumption of the mortar is reduced, the consistency is increased, and the working performance is greatly improved; meanwhile, as the silane coupling agent has hydrophilicity, the rate of secondary hydration reaction can be accelerated, a hydration product with a more compact structure is generated to fill a capillary channel, the porosity of the mortar is reduced, the pore size distribution of the mortar is optimized, and the anti-permeability performance of the mortar is improved;
(3) The diluted epoxy resin is adopted as the coating material of the powder and the small-particle fine aggregate in the high-strength waterproof concrete for building construction, and the fly ash and the sand are coated and isolated by stirring, coating and curing, so that the absorption of a waterproof agent is isolated, the using amount of the waterproof agent is reduced, and the efficiency of the waterproof agent is improved; meanwhile, hydroxyl in the bisphenol A type epoxy resin selected by the invention can be subjected to dehydration condensation with hydroxyl in the modified metakaolin and hydroxyl on the surface of the polypropylene fiber to form a staggered network structure, so that the crosslinking density of the system is further improved, and the mechanical property and the waterproof property of the system are improved;
(4) The high-strength waterproof concrete for building construction adopts a mode of internally doping active chemical substances of sodium citrate, sodium sulfate, aluminum silicate and sodium methyl silicate, and the sodium citrate can prolong the setting time of the concrete and delay a cement hydration product Ca (OH) 2 The precipitation speed delays the nucleation and generation of ettringite and gypsum crystals, limits the crystals to be coarse and large, and improves the impermeability of concrete; the sodium sulfate can be mixed with cement hydration product Ca (OH) 2 Reaction occurs to produce CaSO 4 And C 3 A reacts to generate a certain amount of ettringite which can block capillary holes in the mortar; the aluminum silicate is the main component of the metakaolin, and can react with hydration product calcium hydroxide to generate calcium silicate colloid, so that the compactness of the concrete slurry is improved; reacting sodium methyl silicate with water and carbon dioxide to form a hydrophobic film; on one hand, the active chemical substance can react with the cement hydration product, the generated crystal can block the concrete pores and cracks, the compactness of the concrete is improved, and the concrete has higher primary impermeability, and on the other hand, the active chemical substance has good secondary impermeability through the circulation effect of the complex precipitation reaction.
Drawings
FIG. 1 is a process flow diagram of the preparation of high strength waterproof concrete for building construction according to the present invention;
FIG. 2 is a process flow chart for preparing the high-strength waterproof concrete brick for building construction according to the present invention;
FIG. 3 is a graph comparing the compressive strength test of high-strength waterproof concrete for building construction 7d according to the example of the present invention with that of the comparative example;
FIG. 4 is a graph comparing the compressive strength test of high strength waterproof concrete 28d for building construction of examples of the present invention and comparative examples;
FIG. 5 is a comparison graph of the maximum permeation pressure resistance test of the high strength waterproof concrete for building construction of examples of the present invention and comparative examples.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without any creative work based on the embodiments of the present invention belong to the protection scope of the present invention.
Example 1
The embodiment discloses a preparation method of a high-strength waterproof concrete brick for building construction, which comprises the following steps:
step (1) preparation of hydroxylated polypropylene fiber:
1) Soaking polypropylene fibers in 40% acetone aqueous solution by volume fraction for 1h, then soaking in 20% ethanol aqueous solution by volume fraction for 1h, and ultrasonically cleaning in deionized water for 20min, wherein the ultrasonic frequency is 150kHz, and the ultrasonic power is 1000W, so as to obtain cleaned polypropylene fibers;
2) Soaking the cleaned polypropylene fiber in 30wt% sulfuric acid water solution for 1.5h, washing with 20% ethanol water solution by volume fraction for 3 times, washing with deionized water for 3 times, and drying at 60 deg.C for 6h to obtain polypropylene fiber with rough surface;
3) Sequentially adding the polypropylene fibers with rough surfaces into aqueous solutions of 2wt%, 5wt% and 10wt% of hydrogen peroxide, respectively reacting for 2h at the temperature of 95 ℃ and the stirring speed of 3000r/min, washing for 3 times by using deionized water, and drying for 4h at the temperature of 40 ℃ to obtain hydroxylated polypropylene fibers; wherein, 0.2g of polypropylene fiber with rough surface is added into each milliliter of aqueous solution of hydrogen peroxide;
preparing the modified basalt fiber in the step (2): mixing basalt fibers with 40% by volume of acetone aqueous solution according to the weight ratio of 1:20, heating to 80 ℃, condensing and refluxing for 12 hours to obtain basalt fibers with surface impurities removed, washing the basalt fibers with deionized water for 3 times, and drying at 80 ℃ for 6 hours to obtain pretreated basalt fibers; mixing the pretreated basalt fibers, 3-aminopropyltriethoxysilane, ethanol and deionized water according to the weight ratio of 100:1:4: mixing according to a mass ratio of 0.1, reacting for 2h at a temperature of 50 ℃ and a stirring speed of 3000r/min, washing for 4 times by using deionized water, and drying for 5h at a temperature of 100 ℃ to obtain modified basalt fibers;
preparing the modified metakaolin in the step (3): mixing ethanol and deionized water according to the weight ratio of 4: mixing according to the mass ratio of 0.1, and adding 0.1mol/L HCl aqueous solution until the pH of the solution is 4.1 to obtain ethanol aqueous solution; adding metakaolin and 3-aminopropyltriethoxysilane into the ethanol aqueous solution, stirring for 30min at constant temperature of 30 ℃ and at the rotating speed of 3000r/min, adding hydroxylated polypropylene fibers, stirring for 30min at constant temperature of 30 ℃ and at the rotating speed of 3000r/min, adding salicylic acid and modified basalt fibers, stirring for 1h at constant temperature of 30 ℃ and at the rotating speed of 3000r/min to obtain dispersion, filtering the dispersion, drying a filtered product for 24h at 85 ℃, and grinding for 1h to obtain modified metakaolin; wherein the mass ratio of the metakaolin, the 3-aminopropyltriethoxysilane, the salicylic acid, the hydroxylated polypropylene fiber and the modified basalt fiber is 1:0.06:0.004:0.03:0.03; the mass ratio of the 3-aminopropyltriethoxysilane to the ethanol aqueous solution is 1:100;
step (4), preparing high-strength waterproof concrete for building construction: mixing 60 parts of fly ash and 40 parts of epoxy resin diluted by heating to 40 ℃ in parts by mass, stirring for 10min at the stirring speed of 1000rpm, adding 600 parts of sand, and stirring for 5min at the stirring speed of 1000 rpm; then adding 250 parts of cement and 1000 parts of stone, and stirring for 20min under the condition that the stirring speed is 1000 rpm; then adding 0.12 part of sodium citrate, 1 part of sodium sulfate, 0.75 part of aluminum silicate, 0.25 part of sodium methyl silicate, 30 parts of modified metakaolin, 1.25 parts of expanding agent, 5 parts of compacting agent, 5 parts of water reducing agent, 0.1 part of defoaming agent and 140 parts of water, and stirring for 30min under the condition that the stirring speed is 800rpm to obtain the high-strength waterproof concrete for building construction; wherein the epoxy resin is bisphenol A epoxy resin, the diluent for diluting the bisphenol A epoxy resin is benzyl alcohol, and each 100 parts of bisphenol A epoxy resin is diluted by 70 parts of the diluent in parts by mass;
step (5) preparation of the high-strength waterproof concrete brick for building construction: stirring the high-strength waterproof concrete for building construction at the rotating speed of 800r/min for 5min, and pouring the concrete into a brick model of a carbon dioxide protection chamber; and vacuumizing the interior of the carbon dioxide guard chamber, filling carbon dioxide with the concentration of 100%, controlling the introduction amount of the carbon dioxide to enable the pressure in the carbon dioxide guard chamber to be 0.6Bar, and maintaining for 4 hours to obtain the high-strength waterproof concrete brick for building.
Example 2
The embodiment discloses a preparation method of a high-strength waterproof concrete brick for building construction, which comprises the following steps:
step (1) preparation of hydroxylated polypropylene fiber:
1) Soaking polypropylene fibers in an acetone aqueous solution with the volume fraction of 60% for 1h, then soaking in an ethanol aqueous solution with the volume fraction of 30% for 1h, and ultrasonically cleaning in deionized water for 20min, wherein the ultrasonic frequency is 150kHz, and the ultrasonic power is 1000W, so as to obtain cleaned polypropylene fibers;
2) Soaking the cleaned polypropylene fiber in 50wt% sulfuric acid water solution for 1.5h, washing with 30% ethanol water solution by volume fraction for 3 times, washing with deionized water for 3 times, and drying at 80 ℃ for 12h to obtain polypropylene fiber with rough surface;
3) Sequentially adding the polypropylene fibers with rough surfaces into aqueous solutions of 2wt%, 5wt% and 10wt% of hydrogen peroxide, respectively reacting for 3 hours at the temperature of 100 ℃ and the stirring speed of 3000r/min, washing for 3 times by using deionized water, and drying for 6 hours at the temperature of 60 ℃ to obtain hydroxylated polypropylene fibers; wherein, 0.2g of polypropylene fiber with rough surface is added into each milliliter of aqueous solution of hydrogen peroxide;
preparing the modified basalt fiber in the step (2): mixing basalt fibers with an acetone aqueous solution with the volume fraction of 60% according to the proportion of 1:20, heating to 100 ℃, condensing and refluxing for 48 hours to obtain basalt fibers with surface impurities removed, washing the basalt fibers with deionized water for 3 times, and drying at 80 ℃ for 6 hours to obtain pretreated basalt fibers; mixing the pretreated basalt fibers, 3-aminopropyltriethoxysilane, ethanol and deionized water according to the weight ratio of 100:1:4:0.5, reacting for 4 hours at the temperature of 70 ℃ and the stirring speed of 3000r/min, washing for 4 times by deionized water, and drying for 5 hours at the temperature of 100 ℃ to obtain the modified basalt fiber.
Preparing modified metakaolin in the step (3): mixing ethanol and deionized water according to the weight ratio of 4: mixing according to the mass ratio of 0.5, and adding 0.1mol/L HCl aqueous solution until the pH value of the solution is 4.5 to obtain ethanol aqueous solution; adding metakaolin and 3-aminopropyltriethoxysilane into the ethanol aqueous solution, stirring for 30min at constant temperature of 30 ℃ and at the rotating speed of 3000r/min, adding hydroxylated polypropylene fibers, stirring for 30min at constant temperature of 30 ℃ and at the rotating speed of 3000r/min, adding salicylic acid and modified basalt fibers, stirring for 1h at constant temperature of 30 ℃ and at the rotating speed of 3000r/min to obtain dispersion, filtering the dispersion, drying a filtered product for 24h at 85 ℃, and grinding for 1h to obtain modified metakaolin; wherein the mass ratio of the metakaolin, the 3-aminopropyltriethoxysilane, the salicylic acid, the hydroxylated polypropylene fiber to the modified basalt fiber is 1:0.06:0.004:0.03:0.03; the mass ratio of the 3-aminopropyltriethoxysilane to the ethanol aqueous solution is 1:100, respectively;
step (4), preparing high-strength waterproof concrete for building construction: mixing 80 parts of fly ash and 60 parts of epoxy resin diluted by heating to 60 ℃ in parts by mass, stirring for 20min at the stirring speed of 1000rpm, adding 700 parts of sand, and stirring for 10min at the stirring speed of 1000 rpm; then adding 350 parts of cement and 1200 parts of stone, and stirring for 30min under the condition that the stirring speed is 1000 rpm; then adding 0.18 part of sodium citrate, 1.4 parts of sodium sulfate, 1.05 parts of aluminum silicate, 0.35 part of sodium methyl silicate, 50 parts of modified metakaolin, 2.5 parts of expanding agent, 7 parts of compacting agent, 10 parts of water reducing agent, 0.5 part of defoaming agent and 160 parts of water, and stirring for 60min under the condition that the stirring speed is 800rpm to obtain the high-strength waterproof concrete for building construction; wherein the epoxy resin is bisphenol A epoxy resin, the diluent for diluting the bisphenol A epoxy resin is benzyl alcohol, and each 100 parts of bisphenol A epoxy resin is diluted by 70 parts of the diluent in parts by mass;
step (5), preparing the high-strength waterproof concrete brick for building construction: stirring the high-strength waterproof concrete for building construction at the rotating speed of 800r/min for 5min, and pouring the mixture into a brick model of a carbon dioxide protection chamber; and vacuumizing the interior of the carbon dioxide guard chamber, filling carbon dioxide with the concentration of 100%, controlling the introduction amount of the carbon dioxide to enable the pressure in the carbon dioxide guard chamber to be 0.6Bar, and maintaining for 4 hours to obtain the high-strength waterproof concrete brick for building.
Example 3
The embodiment discloses a preparation method of a high-strength waterproof concrete brick for building construction, which comprises the following steps:
step (1) preparation of hydroxylated polypropylene fiber:
1) Soaking polypropylene fibers in 45% acetone aqueous solution by volume fraction for 1h, then soaking in 22% ethanol aqueous solution by volume fraction for 1h, and ultrasonically cleaning in deionized water for 20min, wherein the ultrasonic frequency is 150kHz, and the ultrasonic power is 1000W, so as to obtain cleaned polypropylene fibers;
2) Soaking the cleaned polypropylene fiber in 35wt% sulfuric acid water solution for 1.5h, washing with 22% ethanol water solution by volume fraction for 3 times, washing with deionized water for 3 times, and drying at 65 ℃ for 7h to obtain polypropylene fiber with rough surface;
3) Sequentially adding the polypropylene fibers with rough surfaces into aqueous solutions of 2wt%, 5wt% and 10wt% of hydrogen peroxide, respectively reacting for 2.2h at the temperature of 96 ℃ and the stirring speed of 3000r/min, washing for 3 times by using deionized water, and drying for 4.5h at the temperature of 45 ℃ to obtain hydroxylated polypropylene fibers; wherein, 0.2g of polypropylene fiber with rough surface is added into each milliliter of aqueous solution of hydrogen peroxide;
preparing the modified basalt fiber in the step (2): mixing basalt fibers with a 45% acetone aqueous solution in volume fraction according to a ratio of 1:20, heating to 85 ℃, condensing and refluxing for 20 hours to obtain basalt fibers with surface impurities removed, washing the basalt fibers with deionized water for 3 times, and drying at 80 ℃ for 6 hours to obtain pretreated basalt fibers; mixing the pretreated basalt fibers, 3-aminopropyltriethoxysilane, ethanol and deionized water according to the weight ratio of 100:1:4: mixing according to a mass ratio of 0.2, reacting for 2.5h at a temperature of 55 ℃ and a stirring speed of 3000r/min, washing for 4 times by using deionized water, and drying for 5h at 100 ℃ to obtain modified basalt fibers;
preparing the modified metakaolin in the step (3): mixing ethanol and deionized water according to a ratio of 4: mixing according to the mass ratio of 0.2, and adding 0.1mol/L HCl aqueous solution until the pH value of the solution is 4.2 to obtain ethanol aqueous solution; adding metakaolin and 3-aminopropyltriethoxysilane into the ethanol aqueous solution, stirring for 30min at constant temperature of 30 ℃ and at the rotating speed of 3000r/min, adding hydroxylated polypropylene fibers, stirring for 30min at constant temperature of 30 ℃ and at the rotating speed of 3000r/min, adding salicylic acid and modified basalt fibers, stirring for 1h at constant temperature of 30 ℃ and at the rotating speed of 3000r/min to obtain dispersion, filtering the dispersion, drying a filtered product for 24h at 85 ℃, and grinding for 1h to obtain modified metakaolin; wherein the mass ratio of the metakaolin, the 3-aminopropyltriethoxysilane, the salicylic acid, the hydroxylated polypropylene fiber to the modified basalt fiber is 1:0.06:0.004:0.03:0.03; the mass ratio of the 3-aminopropyltriethoxysilane to the ethanol aqueous solution is 1:100, respectively;
step (4), preparing high-strength waterproof concrete for building construction: mixing 65 parts of fly ash and 45 parts of epoxy resin diluted by heating to 45 ℃, stirring for 12min at the stirring speed of 1000rpm, adding 620 parts of sand, and stirring for 6min at the stirring speed of 1000 rpm; then adding 270 parts of cement and 1050 parts of stone, and stirring for 22min under the condition that the stirring speed is 1000 rpm; then adding 0.13 part of sodium citrate, 1.2 parts of sodium sulfate, 0.85 part of aluminum silicate, 0.27 part of sodium methyl silicate, 35 parts of modified metakaolin, 1.5 parts of expanding agent, 5.5 parts of compacting agent, 6 parts of water reducing agent, 0.2 part of defoaming agent and 145 parts of water, and stirring for 35min under the condition that the stirring speed is 800rpm to obtain the high-strength waterproof concrete for building construction; wherein the epoxy resin is bisphenol A epoxy resin, the diluent for diluting the bisphenol A epoxy resin is benzyl alcohol, and each 100 parts of bisphenol A epoxy resin is diluted by 70 parts of the diluent in parts by mass;
step (5) preparation of the high-strength waterproof concrete brick for building construction: stirring the high-strength waterproof concrete for building construction at the rotating speed of 800r/min for 5min, and pouring the mixture into a brick model of a carbon dioxide protection chamber; and vacuumizing the interior of the carbon dioxide guard chamber, filling carbon dioxide with the concentration of 100%, controlling the introduction amount of the carbon dioxide to enable the pressure in the carbon dioxide guard chamber to be 0.6Bar, and maintaining for 4 hours to obtain the high-strength waterproof concrete brick for building.
Example 4
The embodiment discloses a preparation method of a high-strength waterproof concrete brick for building construction, which comprises the following steps:
step (1) preparation of hydroxylated polypropylene fiber:
1) Soaking polypropylene fibers in 50% by volume of acetone aqueous solution for 1h, then soaking in 24% by volume of ethanol aqueous solution for 1h, and ultrasonically cleaning in deionized water for 20min, wherein the ultrasonic frequency is 150kHz, and the ultrasonic power is 1000W, so as to obtain cleaned polypropylene fibers;
2) Soaking the cleaned polypropylene fiber in 40wt% sulfuric acid water solution for 1.5h, washing with 24% ethanol water solution by volume fraction for 3 times, washing with deionized water for 3 times, and drying at 70 ℃ for 8h to obtain polypropylene fiber with a rough surface;
3) Sequentially adding the polypropylene fibers with rough surfaces into aqueous solutions of 2wt%, 5wt% and 10wt% of hydrogen peroxide, respectively reacting for 2.4h at the temperature of 97 ℃ and the stirring speed of 3000r/min, washing for 3 times by using deionized water, and drying for 5h at the temperature of 50 ℃ to obtain hydroxylated polypropylene fibers; wherein, 0.2g of polypropylene fiber with rough surface is added into each milliliter of aqueous solution of hydrogen peroxide;
preparing the modified basalt fiber in the step (2): mixing basalt fibers with an acetone aqueous solution with a volume fraction of 50% according to a ratio of 1:20, heating to 90 ℃, condensing and refluxing for 30 hours to obtain basalt fibers with surface impurities removed, washing the basalt fibers with deionized water for 3 times, and drying at 80 ℃ for 6 hours to obtain pretreated basalt fibers; mixing the pretreated basalt fibers, 3-aminopropyltriethoxysilane, ethanol and deionized water according to the weight ratio of 100:1:4: mixing according to a mass ratio of 0.3, reacting for 3h at a temperature of 60 ℃ and a stirring speed of 3000r/min, washing for 4 times by using deionized water, and drying for 5h at 100 ℃ to obtain modified basalt fibers;
preparing the modified metakaolin in the step (3): mixing ethanol and deionized water according to the weight ratio of 4: mixing according to the mass ratio of 0.3, and adding 0.1mol/L HCl aqueous solution until the pH value of the solution is 4.3 to obtain ethanol aqueous solution; adding metakaolin and 3-aminopropyltriethoxysilane into the ethanol aqueous solution, stirring for 30min at constant temperature of 30 ℃ and at the rotating speed of 3000r/min, adding hydroxylated polypropylene fibers, stirring for 30min at constant temperature of 30 ℃ and at the rotating speed of 3000r/min, adding salicylic acid and modified basalt fibers, stirring for 1h at constant temperature of 30 ℃ and at the rotating speed of 3000r/min to obtain dispersion, filtering the dispersion, drying a filtered product for 24h at 85 ℃, and grinding for 1h to obtain modified metakaolin; wherein the mass ratio of the metakaolin, the 3-aminopropyltriethoxysilane, the salicylic acid, the hydroxylated polypropylene fiber and the modified basalt fiber is 1:0.06:0.004:0.03:0.03; the mass ratio of the 3-aminopropyltriethoxysilane to the ethanol aqueous solution is 1:100, respectively;
step (4), preparing high-strength waterproof concrete for building construction: mixing 70 parts of fly ash and 50 parts of epoxy resin diluted by heating to 50 ℃, stirring for 15min at the stirring speed of 1000rpm, adding 640 parts of sand, and stirring for 7min at the stirring speed of 1000 rpm; then 300 parts of cement and 1100 parts of stone are added, and the mixture is stirred for 25min under the condition that the stirring speed is 1000 rpm; then adding 0.15 part of sodium citrate, 1.3 parts of sodium sulfate, 0.9 part of aluminum silicate, 0.29 part of sodium methylsilicate, 40 parts of modified metakaolin, 1.75 parts of expanding agent, 6 parts of compacting agent, 7 parts of water reducing agent, 0.3 part of defoaming agent and 150 parts of water, and stirring for 40min under the condition that the stirring speed is 800rpm to obtain the high-strength waterproof concrete for building construction; wherein the epoxy resin is bisphenol A epoxy resin, the diluent for diluting the bisphenol A epoxy resin is benzyl alcohol, and each 100 parts by mass of the bisphenol A epoxy resin is diluted by 70 parts by mass of the diluent;
step (5) preparation of the high-strength waterproof concrete brick for building construction: stirring the high-strength waterproof concrete for building construction at the rotating speed of 800r/min for 5min, and pouring the mixture into a brick model of a carbon dioxide protection chamber; and vacuumizing the interior of the carbon dioxide guard chamber, filling carbon dioxide with the concentration of 100%, controlling the introduction amount of the carbon dioxide to enable the pressure in the carbon dioxide guard chamber to be 0.6Bar, and maintaining for 4 hours to obtain the high-strength waterproof concrete brick for building.
Example 5
The embodiment discloses a preparation method of a high-strength waterproof concrete brick for building construction, which comprises the following steps:
step (1) preparation of hydroxylated polypropylene fiber:
1) Soaking polypropylene fibers in 55% by volume of acetone aqueous solution for 1h, then soaking in 26% by volume of ethanol aqueous solution for 1h, and ultrasonically cleaning in deionized water for 20min, wherein the ultrasonic frequency is 150kHz and the ultrasonic power is 1000W, so as to obtain cleaned polypropylene fibers;
2) Soaking the cleaned polypropylene fiber in 45wt% sulfuric acid water solution for 1.5h, washing with 26% ethanol water solution by volume fraction for 3 times, washing with deionized water for 3 times, and drying at 75 ℃ for 10h to obtain polypropylene fiber with a rough surface;
3) Sequentially adding the polypropylene fibers with rough surfaces into aqueous solutions of 2wt%, 5wt% and 10wt% of hydrogen peroxide, respectively reacting for 2.6h at the temperature of 98 ℃ and the stirring speed of 3000r/min, washing for 3 times by using deionized water, and drying for 5.5h at the temperature of 55 ℃ to obtain hydroxylated polypropylene fibers; wherein, 0.2g of polypropylene fiber with rough surface is added into each milliliter of aqueous solution of hydrogen peroxide;
preparing the modified basalt fiber in the step (2): mixing basalt fibers with 55% by volume of acetone aqueous solution according to the weight ratio of 1:20, heating to 95 ℃, condensing and refluxing for 38 hours to obtain basalt fibers with surface impurities removed, washing the basalt fibers with deionized water for 3 times, and drying at 80 ℃ for 6 hours to obtain pretreated basalt fibers; mixing the pretreated basalt fibers, 3-aminopropyltriethoxysilane, ethanol and deionized water according to the weight ratio of 100:1:4:0.4, reacting for 3.5 hours at the temperature of 65 ℃ and the stirring speed of 3000r/min, washing for 4 times by using deionized water, and drying for 5 hours at the temperature of 100 ℃ to obtain modified basalt fibers;
preparing modified metakaolin in the step (3): mixing ethanol and deionized water according to a ratio of 4: mixing according to the mass ratio of 0.4, and adding 0.1mol/L HCl aqueous solution until the pH value of the solution is 4.4 to obtain ethanol aqueous solution; adding metakaolin and 3-aminopropyltriethoxysilane into the ethanol aqueous solution, stirring for 30min at constant temperature of 30 ℃ and at the rotating speed of 3000r/min, adding hydroxylated polypropylene fiber, stirring for 30min at constant temperature of 30 ℃ and at the rotating speed of 3000r/min, adding salicylic acid and modified basalt fiber, stirring for 1h at constant temperature of 30 ℃ and at the rotating speed of 3000r/min to obtain dispersion liquid, filtering the dispersion liquid, drying a filtered product at 85 ℃ for 24h, and grinding for 1h to obtain modified metakaolin; wherein the mass ratio of the metakaolin, the 3-aminopropyltriethoxysilane, the salicylic acid, the hydroxylated polypropylene fiber and the modified basalt fiber is 1:0.06:0.004:0.03:0.03; the mass ratio of the 3-aminopropyltriethoxysilane to the ethanol aqueous solution is 1:100, respectively;
step (4), preparing high-strength waterproof concrete for building construction: mixing 75 parts of fly ash and 55 parts of epoxy resin diluted by heating to 55 ℃, stirring for 17min at the stirring speed of 1000rpm, adding 660 parts of sand, and stirring for 8min at the stirring speed of 1000 rpm; then adding 330 parts of cement and 1150 parts of stone, and stirring for 27min under the condition that the stirring speed is 1000 rpm; then adding 0.17 part of sodium citrate, 1.3 parts of sodium sulfate, 1.0 part of aluminum silicate, 0.33 part of sodium methylsilicate, 45 parts of modified metakaolin, 2.0 parts of an expanding agent, 6.5 parts of a compacting agent, 8 parts of a water reducing agent, 0.4 part of a defoaming agent and 155 parts of water, and stirring for 50min under the condition that the stirring speed is 800rpm to obtain the high-strength waterproof concrete for building construction; wherein the epoxy resin is bisphenol A epoxy resin, the diluent for diluting the bisphenol A epoxy resin is benzyl alcohol, and each 100 parts of bisphenol A epoxy resin is diluted by 70 parts of the diluent in parts by mass;
step (5), preparing the high-strength waterproof concrete brick for building construction: stirring the high-strength waterproof concrete for building construction at the rotating speed of 800r/min for 5min, and pouring the mixture into a brick model of a carbon dioxide protection chamber; and vacuumizing the interior of the carbon dioxide guard chamber, filling carbon dioxide with the concentration of 100%, controlling the introduction amount of the carbon dioxide to enable the pressure in the carbon dioxide guard chamber to be 0.6Bar, and curing for 4 hours to obtain the high-strength waterproof concrete brick for building.
Comparative example 1
The comparative example discloses a preparation method of a high-strength waterproof concrete brick for building construction, which comprises the following steps:
step (1), polypropylene fiber cleaning: soaking polypropylene fibers in 45% acetone aqueous solution by volume fraction for 1h, then soaking in 22% ethanol aqueous solution by volume fraction for 1h, and ultrasonically cleaning in deionized water for 20min, wherein the ultrasonic frequency is 150kHz, and the ultrasonic power is 1000W, so as to obtain cleaned polypropylene fibers;
preparing the modified basalt fiber in the step (2): mixing basalt fibers with a 45% acetone aqueous solution in volume fraction according to a ratio of 1:20, heating to 85 ℃, condensing and refluxing for 20 hours to obtain basalt fibers with surface impurities removed, washing the basalt fibers with deionized water for 3 times, and drying at 80 ℃ for 6 hours to obtain pretreated basalt fibers; mixing the pretreated basalt fibers, 3-aminopropyltriethoxysilane, ethanol and deionized water according to the weight ratio of 100:1:4: mixing according to a mass ratio of 0.2, reacting for 2.5h at a temperature of 55 ℃ and a stirring speed of 3000r/min, washing for 4 times by using deionized water, and drying for 5h at 100 ℃ to obtain modified basalt fibers;
preparing the modified metakaolin in the step (3): mixing ethanol and deionized water according to the weight ratio of 4: mixing according to the mass ratio of 0.2, and adding 0.1mol/L HCl aqueous solution until the pH value of the solution is 4.2 to obtain ethanol aqueous solution; adding metakaolin and 3-aminopropyltriethoxysilane into the ethanol aqueous solution, stirring for 30min at a constant temperature of 30 ℃ and a rotating speed of 3000r/min, adding polypropylene fibers, stirring for 30min at a constant temperature of 30 ℃ and a rotating speed of 3000r/min, adding salicylic acid and modified basalt fibers, stirring for 1h at a constant temperature of 30 ℃ and a rotating speed of 3000r/min to obtain a dispersion liquid, filtering the dispersion liquid, drying a filtered product for 24h at 85 ℃, and grinding for 1h to obtain modified metakaolin; wherein the mass ratio of the metakaolin, the 3-aminopropyltriethoxysilane, the salicylic acid, the polypropylene fiber and the modified basalt fiber is 1:0.06:0.004:0.03:0.03; the mass ratio of the 3-aminopropyltriethoxysilane to the ethanol aqueous solution is 1:100;
step (4), preparing high-strength waterproof concrete for building construction: mixing 65 parts of fly ash and 45 parts of epoxy resin diluted by heating to 45 ℃, stirring for 12min at the stirring speed of 1000rpm, adding 620 parts of sand, and stirring for 6min at the stirring speed of 1000 rpm; then adding 270 parts of cement and 1050 parts of stone, and stirring for 22min under the condition that the stirring speed is 1000 rpm; then adding 0.13 part of sodium citrate, 1.2 parts of sodium sulfate, 0.85 part of aluminum silicate, 0.27 part of sodium methyl silicate, 35 parts of modified metakaolin, 1.5 parts of expanding agent, 5.5 parts of compacting agent, 6 parts of water reducing agent, 0.2 part of defoaming agent and 145 parts of water, and stirring for 35min under the condition that the stirring speed is 800rpm to obtain the high-strength waterproof concrete for building construction; wherein the epoxy resin is bisphenol A epoxy resin, the diluent for diluting the bisphenol A epoxy resin is benzyl alcohol, and each 100 parts of bisphenol A epoxy resin is diluted by 70 parts of the diluent in parts by mass;
step (5) preparation of the high-strength waterproof concrete brick for building construction: stirring the high-strength waterproof concrete for building construction at the rotating speed of 800r/min for 5min, and pouring the mixture into a brick model of a carbon dioxide protection chamber; and vacuumizing the interior of the carbon dioxide guard chamber, filling carbon dioxide with the concentration of 100%, controlling the introduction amount of the carbon dioxide to enable the pressure in the carbon dioxide guard chamber to be 0.6Bar, and maintaining for 4 hours to obtain the high-strength waterproof concrete brick for building.
Comparative example 2
The comparative example discloses a preparation method of a high-strength waterproof concrete brick for building construction, which comprises the following steps:
step (1) preparation of hydroxylated polypropylene fiber:
1) Soaking polypropylene fibers in 45% acetone aqueous solution by volume fraction for 1h, then soaking in 22% ethanol aqueous solution by volume fraction for 1h, and ultrasonically cleaning in deionized water for 20min, wherein the ultrasonic frequency is 150kHz, and the ultrasonic power is 1000W, so as to obtain cleaned polypropylene fibers;
2) Soaking the cleaned polypropylene fiber in 35wt% sulfuric acid water solution for 1.5h, washing with 22% ethanol water solution by volume fraction for 3 times, washing with deionized water for 3 times, and drying at 65 ℃ for 7h to obtain polypropylene fiber with rough surface;
3) Sequentially adding the polypropylene fibers with rough surfaces into aqueous solutions of 2wt%, 5wt% and 10wt% of hydrogen peroxide, respectively reacting for 2.2h at the temperature of 96 ℃ and the stirring speed of 3000r/min, washing for 3 times by using deionized water, and drying for 4.5h at the temperature of 45 ℃ to obtain hydroxylated polypropylene fibers; wherein, 0.2g of polypropylene fiber with rough surface is added into each milliliter of aqueous solution of hydrogen peroxide;
preparing modified metakaolin in the step (2): mixing ethanol and deionized water according to a ratio of 4: mixing according to the mass ratio of 0.2, and adding 0.1mol/L HCl aqueous solution until the pH value of the solution is 4.2 to obtain ethanol aqueous solution; adding metakaolin and 3-aminopropyltriethoxysilane into the ethanol aqueous solution, stirring for 30min at constant temperature of 30 ℃ and at the rotating speed of 3000r/min, adding hydroxylated polypropylene fibers, stirring for 30min at constant temperature of 30 ℃ and at the rotating speed of 3000r/min, adding salicylic acid and basalt fibers, stirring for 1h at constant temperature of 30 ℃ and at the rotating speed of 3000r/min to obtain dispersion, filtering the dispersion, drying a filtered product for 24h at 85 ℃, and grinding for 1h to obtain modified metakaolin; wherein the mass ratio of the metakaolin, the 3-aminopropyltriethoxysilane, the salicylic acid, the hydroxylated polypropylene fiber and the basalt fiber is 1:0.06:0.004:0.03:0.03; the mass ratio of the 3-aminopropyltriethoxysilane to the ethanol aqueous solution is 1:100;
step (3), preparing the high-strength waterproof concrete for building construction: mixing 65 parts of fly ash and 45 parts of epoxy resin diluted by heating to 45 ℃, stirring for 12min at the stirring speed of 1000rpm, adding 620 parts of sand, and stirring for 6min at the stirring speed of 1000 rpm; then adding 270 parts of cement and 1050 parts of stone, and stirring for 22min under the condition that the stirring speed is 1000 rpm; then adding 0.13 part of sodium citrate, 1.2 parts of sodium sulfate, 0.85 part of aluminum silicate, 0.27 part of sodium methyl silicate, 35 parts of modified metakaolin, 1.5 parts of expanding agent, 5.5 parts of compacting agent, 6 parts of water reducing agent, 0.2 part of defoaming agent and 145 parts of water, and stirring for 35min under the condition that the stirring speed is 800rpm to obtain the high-strength waterproof concrete for building construction; wherein the epoxy resin is bisphenol A epoxy resin, the diluent for diluting the bisphenol A epoxy resin is benzyl alcohol, and each 100 parts of bisphenol A epoxy resin is diluted by 70 parts of the diluent in parts by mass;
step (4) preparation of the high-strength waterproof concrete brick for building construction: stirring the high-strength waterproof concrete for building construction at the rotating speed of 800r/min for 5min, and pouring the mixture into a brick model of a carbon dioxide protection chamber; and vacuumizing the interior of the carbon dioxide guard chamber, filling carbon dioxide with the concentration of 100%, controlling the introduction amount of the carbon dioxide to enable the pressure in the carbon dioxide guard chamber to be 0.6Bar, and maintaining for 4 hours to obtain the high-strength waterproof concrete brick for building.
Comparative example 3
The comparative example discloses a preparation method of a high-strength waterproof concrete brick for building construction, which comprises the following steps:
step (1) preparation of hydroxylated polypropylene fiber:
1) Soaking polypropylene fibers in 45% acetone aqueous solution by volume fraction for 1h, then soaking in 22% ethanol aqueous solution by volume fraction for 1h, and ultrasonically cleaning in deionized water for 20min, wherein the ultrasonic frequency is 150kHz, and the ultrasonic power is 1000W, so as to obtain cleaned polypropylene fibers;
2) Soaking the cleaned polypropylene fiber in 35wt% sulfuric acid water solution for 1.5h, washing with 22% ethanol water solution by volume fraction for 3 times, washing with deionized water for 3 times, and drying at 65 ℃ for 7h to obtain polypropylene fiber with rough surface;
3) Sequentially adding the polypropylene fibers with rough surfaces into aqueous solutions of 2wt%, 5wt% and 10wt% of hydrogen peroxide, respectively reacting for 2.2h at the temperature of 96 ℃ and the stirring speed of 3000r/min, washing for 3 times by using deionized water, and drying for 4.5h at the temperature of 45 ℃ to obtain hydroxylated polypropylene fibers; wherein, 0.2g of polypropylene fiber with rough surface is added into each milliliter of aqueous solution of hydrogen peroxide;
preparing the modified basalt fiber in the step (2): mixing basalt fibers with a 45% acetone aqueous solution in volume fraction according to a ratio of 1:20, heating to 85 ℃, condensing and refluxing for 20 hours to obtain basalt fibers with surface impurities removed, washing the basalt fibers with deionized water for 3 times, and drying at 80 ℃ for 6 hours to obtain pretreated basalt fibers; mixing the pretreated basalt fibers, 3-aminopropyltriethoxysilane, ethanol and deionized water according to the weight ratio of 100:1:4:0.2, reacting for 2.5 hours at the temperature of 55 ℃ and the stirring speed of 3000r/min, washing for 4 times by using deionized water, and drying for 5 hours at the temperature of 100 ℃ to obtain modified basalt fibers;
step (3), preparing the high-strength waterproof concrete for building construction: mixing 65 parts of fly ash and 45 parts of epoxy resin diluted by heating to 45 ℃, stirring for 12min at the stirring speed of 1000rpm, adding 620 parts of sand, and stirring for 6min at the stirring speed of 1000 rpm; then adding 270 parts of cement and 1050 parts of stone, and stirring for 22min under the condition that the stirring speed is 1000 rpm; then adding 0.13 part of sodium citrate, 1.2 parts of sodium sulfate, 0.85 part of aluminum silicate, 0.27 part of sodium methyl silicate, 35 parts of metakaolin, 1.1 parts of hydroxylated polypropylene fiber, 1.1 parts of modified basalt fiber, 1.5 parts of expanding agent, 5.5 parts of compacting agent, 6 parts of water reducing agent, 0.2 part of defoaming agent and 145 parts of water, and stirring for 35min under the condition that the stirring speed is 800rpm to obtain the high-strength waterproof concrete for building construction; wherein the epoxy resin is bisphenol A epoxy resin, the diluent for diluting the bisphenol A epoxy resin is benzyl alcohol, and each 100 parts of bisphenol A epoxy resin is diluted by 70 parts of the diluent in parts by mass;
step (4), preparing the high-strength waterproof concrete brick for building construction: stirring the high-strength waterproof concrete for building construction at the rotating speed of 800r/min for 5min, and pouring the concrete into a brick model of a carbon dioxide protection chamber; and vacuumizing the interior of the carbon dioxide guard chamber, filling carbon dioxide with the concentration of 100%, controlling the introduction amount of the carbon dioxide to enable the pressure in the carbon dioxide guard chamber to be 0.6Bar, and maintaining for 4 hours to obtain the high-strength waterproof concrete brick for building.
Comparative example 4
The comparative example discloses a preparation method of a high-strength waterproof concrete brick for building construction, which comprises the following steps:
step (1) preparation of hydroxylated polypropylene fiber:
1) Soaking polypropylene fibers in 45% acetone aqueous solution by volume fraction for 1h, then soaking in 22% ethanol aqueous solution by volume fraction for 1h, and ultrasonically cleaning in deionized water for 20min, wherein the ultrasonic frequency is 150kHz, and the ultrasonic power is 1000W, so as to obtain cleaned polypropylene fibers;
2) Soaking the cleaned polypropylene fiber in 35wt% sulfuric acid water solution for 1.5h, washing with 22% ethanol water solution by volume fraction for 3 times, washing with deionized water for 3 times, and drying at 65 ℃ for 7h to obtain polypropylene fiber with rough surface;
3) Sequentially adding the polypropylene fibers with rough surfaces into aqueous solutions of 2wt%, 5wt% and 10wt% of hydrogen peroxide, respectively reacting for 2.2h at the temperature of 96 ℃ and the stirring speed of 3000r/min, washing for 3 times by using deionized water, and drying for 4.5h at the temperature of 45 ℃ to obtain hydroxylated polypropylene fibers; wherein, 0.2g of polypropylene fiber with rough surface is added into each milliliter of aqueous solution of hydrogen peroxide;
preparing the modified basalt fiber in the step (2): mixing basalt fibers with a 45% acetone aqueous solution in volume fraction according to a ratio of 1:20, heating to 85 ℃, condensing and refluxing for 20 hours to obtain basalt fibers with surface impurities removed, washing the basalt fibers with deionized water for 3 times, and drying at 80 ℃ for 6 hours to obtain pretreated basalt fibers; mixing the pretreated basalt fibers, 3-aminopropyltriethoxysilane, ethanol and deionized water according to the weight ratio of 100:1:4: mixing according to a mass ratio of 0.2, reacting for 2.5h at a temperature of 55 ℃ and a stirring speed of 3000r/min, washing for 4 times by using deionized water, and drying for 5h at 100 ℃ to obtain modified basalt fibers;
preparing the modified metakaolin in the step (3): mixing ethanol and deionized water according to the weight ratio of 4: mixing according to the mass ratio of 0.2, and adding 0.1mol/L HCl aqueous solution until the pH value of the solution is 4.2 to obtain ethanol aqueous solution; adding metakaolin and 3-aminopropyltriethoxysilane into the ethanol aqueous solution, stirring for 30min at constant temperature of 30 ℃ and at the rotating speed of 3000r/min, adding hydroxylated polypropylene fibers, stirring for 30min at constant temperature of 30 ℃ and at the rotating speed of 3000r/min, adding salicylic acid and modified basalt fibers, stirring for 1h at constant temperature of 30 ℃ and at the rotating speed of 3000r/min to obtain dispersion, filtering the dispersion, drying a filtered product for 24h at 85 ℃, and grinding for 1h to obtain modified metakaolin; wherein the mass ratio of the metakaolin, the 3-aminopropyltriethoxysilane, the salicylic acid, the hydroxylated polypropylene fiber and the modified basalt fiber is 1:0.06:0.004:0.03:0.03; the mass ratio of the 3-aminopropyltriethoxysilane to the ethanol aqueous solution is 1:100;
step (4), preparing high-strength waterproof concrete for building construction: mixing 65 parts of fly ash and 45 parts of epoxy resin diluted by heating to 45 ℃, stirring for 12min at the stirring speed of 1000rpm, adding 620 parts of sand, and stirring for 6min at the stirring speed of 1000 rpm; then adding 270 parts of cement and 1050 parts of stone, and stirring for 22min under the condition that the stirring speed is 1000 rpm; then adding 0.13 part of sodium citrate, 1.2 parts of sodium sulfate, 0.85 part of aluminum silicate, 35 parts of modified metakaolin, 1.5 parts of expanding agent, 5.5 parts of compacting agent, 6 parts of water reducing agent, 0.2 part of defoaming agent and 145 parts of water, and stirring for 35min under the condition that the stirring speed is 800rpm to obtain the high-strength waterproof concrete for building construction; wherein the epoxy resin is bisphenol A epoxy resin, the diluent for diluting the bisphenol A epoxy resin is benzyl alcohol, and each 100 parts of bisphenol A epoxy resin is diluted by 70 parts of the diluent in parts by mass;
step (5) preparation of the high-strength waterproof concrete brick for building construction: stirring the high-strength waterproof concrete for building construction at the rotating speed of 800r/min for 5min, and pouring the mixture into a brick model of a carbon dioxide protection chamber; and vacuumizing the interior of the carbon dioxide guard chamber, filling carbon dioxide with the concentration of 100%, controlling the introduction amount of the carbon dioxide to enable the pressure in the carbon dioxide guard chamber to be 0.6Bar, and maintaining for 4 hours to obtain the high-strength waterproof concrete brick for building.
Comparative example 5
The comparative example discloses a preparation method of a high-strength waterproof concrete brick for building construction, which comprises the following steps:
step (1) preparation of hydroxylated polypropylene fiber:
1) Soaking polypropylene fibers in 45% acetone aqueous solution by volume fraction for 1h, then soaking in 22% ethanol aqueous solution by volume fraction for 1h, and ultrasonically cleaning in deionized water for 20min, wherein the ultrasonic frequency is 150kHz, and the ultrasonic power is 1000W, so as to obtain cleaned polypropylene fibers;
2) Soaking the polypropylene fiber after cleaning treatment in 35wt% sulfuric acid aqueous solution for 1.5h, washing with 22% by volume of ethanol aqueous solution for 3 times, then washing with deionized water for 3 times, and drying at 65 ℃ for 7h to obtain polypropylene fiber with rough surface;
3) Sequentially adding the polypropylene fibers with rough surfaces into aqueous solutions of 2wt%, 5wt% and 10wt% of hydrogen peroxide, respectively reacting for 2.2h at the temperature of 96 ℃ and the stirring speed of 3000r/min, washing for 3 times by using deionized water, and drying for 4.5h at the temperature of 45 ℃ to obtain hydroxylated polypropylene fibers; wherein, 0.2g of polypropylene fiber with rough surface is added into each milliliter of aqueous solution of hydrogen peroxide;
preparing the modified basalt fiber in the step (2): mixing basalt fibers with a 45% acetone aqueous solution in volume fraction according to a ratio of 1:20, heating to 85 ℃, condensing and refluxing for 20 hours to obtain basalt fibers with surface impurities removed, washing the basalt fibers with deionized water for 3 times, and drying at 80 ℃ for 6 hours to obtain pretreated basalt fibers; mixing the pretreated basalt fibers, 3-aminopropyltriethoxysilane, ethanol and deionized water according to the weight ratio of 100:1:4: mixing according to a mass ratio of 0.2, reacting for 2.5h at a temperature of 55 ℃ and a stirring speed of 3000r/min, washing for 4 times by using deionized water, and drying for 5h at 100 ℃ to obtain modified basalt fibers;
preparing the modified metakaolin in the step (3): mixing ethanol and deionized water according to the weight ratio of 4: mixing according to the mass ratio of 0.2, and adding 0.1mol/L HCl aqueous solution until the pH value of the solution is 4.2 to obtain ethanol aqueous solution; adding metakaolin and 3-aminopropyltriethoxysilane into the ethanol aqueous solution, stirring for 30min at constant temperature of 30 ℃ and at the rotating speed of 3000r/min, adding hydroxylated polypropylene fibers, stirring for 30min at constant temperature of 30 ℃ and at the rotating speed of 3000r/min, adding salicylic acid and modified basalt fibers, stirring for 1h at constant temperature of 30 ℃ and at the rotating speed of 3000r/min to obtain dispersion, filtering the dispersion, drying a filtered product for 24h at 85 ℃, and grinding for 1h to obtain modified metakaolin; wherein the mass ratio of the metakaolin, the 3-aminopropyltriethoxysilane, the salicylic acid, the hydroxylated polypropylene fiber and the modified basalt fiber is 1:0.06:0.004:0.03:0.03; the mass ratio of the 3-aminopropyltriethoxysilane to the ethanol aqueous solution is 1:100, respectively;
step (4) preparation of high-strength waterproof concrete for building construction: stirring 65 parts of fly ash and 620 parts of sand for 6min at the stirring speed of 1000 rpm; then adding 270 parts of cement and 1050 parts of stone, and stirring for 22min under the condition that the stirring speed is 1000 rpm; then adding 0.13 part of sodium citrate, 1.2 parts of sodium sulfate, 0.85 part of aluminum silicate, 0.27 part of sodium methyl silicate, 35 parts of modified metakaolin, 1.5 parts of expanding agent, 5.5 parts of compacting agent, 6 parts of water reducing agent, 0.2 part of defoaming agent and 145 parts of water, and stirring for 35min under the condition that the stirring speed is 800rpm to obtain the high-strength waterproof concrete for building construction;
step (5), preparing the high-strength waterproof concrete brick for building construction: stirring the high-strength waterproof concrete for building construction at the rotating speed of 800r/min for 5min, and pouring the mixture into a brick model of a carbon dioxide protection chamber; and vacuumizing the interior of the carbon dioxide guard chamber, filling carbon dioxide with the concentration of 100%, controlling the introduction amount of the carbon dioxide to enable the pressure in the carbon dioxide guard chamber to be 0.6Bar, and maintaining for 4 hours to obtain the high-strength waterproof concrete brick for building.
The polypropylene fibers of all the examples and comparative examples above, having a diameter of 20 μm, were obtained from the Beijing Wan Hamming technology Co., ltd, having a product number of 20200405; basalt fiber, 6mm in length, from Tianyi engineering fiber, inc., changzhou, having a designation TY-6; metakaolin with the granularity of 1250 meshes is from a mineral processing plant of stone peak in Lingshu county and the cargo number is sf-gp; salicylic acid, analytically pure, from the metallocene chemical industry; fly ash from the processing plant of Huashuo mineral products in Lingshu county, with a product number of 20220605; the cement is ordinary portland cement P.O 42.5.5, and is from the new material science and technology limited of Xindingli of Hunan; the fineness modulus of the sand is 2.8; the particle size of the stone is 5-20mm; sodium citrate, available from Haylon chemical Co., suzhou under the product number 53253; sodium sulfate from corridor, peng color, fine chemical Co., ltd, with a cargo number of 0084; aluminum silicate, 2000 mesh in size, from Lolo commercial trade in Changzhou city; sodium methyl silicate, from denxin shun chemical ltd, cat No. 20200916; the expanding agent is a U-shaped high-efficiency concrete expanding agent UEA from Warm family materials science and technology Limited company in Anhui province; the compacting agent is a siliceous compacting agent, is from Beijing Haishite industry concrete admixture sales Limited company, and has the product number of JJ91; the water reducing agent is a polycarboxylic acid water reducing agent and is from Shandong Jinbande novel building materials Co.Ltd; the defoaming agent is a polyether modified silicon building defoaming agent, is from New materials, inc. of south China Bright, guangdong, and has a product number of CI-1641; the bisphenol A type epoxy resin is a Phoenix brand E-44 bisphenol A type epoxy resin and is sourced from Shenyang Xinmaofu Fine chemical industry materials Co.
The above comparative example is based on example 3, and the polypropylene fiber in comparative example 1 is not subjected to hydroxylation treatment; in comparative example 2, the basalt fiber was not subjected to modification treatment; in comparative example 3, metakaolin was not subjected to modification treatment; the activator in comparative example 4 was without sodium methyl silicate; in comparative example 5 no epoxy resin was added.
Test one, compression strength test: the high-strength waterproof concrete for building construction in the above examples and comparative examples was prepared into 100mm × 100mm × 100mm concrete samples according to the standard of GBJ 81-85 "test method for mechanical properties of ordinary concrete", and after molding, the concrete samples were left to stand at room temperature for 24 hours, and then the concrete samples were demolded and placed in a standard curing room for curing, and the compressive strength was measured until the specified age. The test results are shown in table 1:
TABLE 1
Figure 46104DEST_PATH_IMAGE001
From the test results in table 1, it is understood that the high strength waterproof concrete 28d for building construction prepared in example 2 of the present invention has a compressive strength of 119.3 and an excellent compressive strength.
Test II and maximum impervious pressure test: the high-strength waterproof concrete for building construction in the above examples and comparative examples was subjected to a test of maximum permeation resistance pressure with reference to "cement-based infiltration crystalline waterproof material" (GB/T18445-2012) with respect to a standard test piece of 28-day curing age. The test results are shown in table 2:
TABLE 2
Figure 258779DEST_PATH_IMAGE002
As can be seen from the test results in table 2, the high-strength waterproof concrete for building construction prepared in the examples and comparative examples of the present invention has better waterproof ability than ordinary concrete, the polypropylene fiber is not hydroxylated, the basalt fiber is not modified, the metakaolin is not modified, and the epoxy resin is not added, which all affect the waterproof performance of the concrete, and if sodium methyl silicate is removed from the composite active chemical substance, the waterproof performance of the concrete is also affected.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (8)

1. A preparation method of high-strength waterproof concrete for building construction is characterized by comprising the following steps:
step (1) preparation of hydroxylated polypropylene fiber: soaking the cleaned polypropylene fiber in a sulfuric acid aqueous solution to obtain polypropylene fiber with a rough surface; sequentially adding the polypropylene fibers with rough surfaces into aqueous solution of 2wt%, 5wt% and 10wt% of hydrogen peroxide, heating and stirring to obtain hydroxylated polypropylene fibers;
preparing the modified basalt fiber in the step (2): mixing the pretreated basalt fibers, an aminosilane coupling agent, ethanol and deionized water, heating and stirring to obtain modified basalt fibers;
preparing the modified metakaolin in the step (3): adding metakaolin and a silane coupling agent into an ethanol water solution, stirring, adding hydroxylated polypropylene fibers, stirring, adding salicylic acid and modified basalt fibers, and stirring to obtain modified metakaolin;
step (4) preparation of high-strength waterproof concrete for building construction: mixing and stirring fly ash, diluted epoxy resin, sand, cement, stone, sodium citrate, sodium sulfate, aluminum silicate, sodium methyl silicate, modified metakaolin, an expanding agent, a compacting agent, a water reducing agent, a defoaming agent and water to obtain the high-strength waterproof concrete for building construction;
wherein, the preparation of the modified metakaolin in the step (3) comprises the following steps: mixing ethanol and deionized water according to the weight ratio of 4: (0.1-0.5), adding 0.1mol/L HCl aqueous solution until the pH of the solution is 4-5 to obtain ethanol aqueous solution; adding metakaolin and a silane coupling agent into the ethanol aqueous solution, stirring for 30min at the constant temperature of 30 ℃ and the rotating speed of 3000r/min, adding hydroxylated polypropylene fiber, stirring for 30min at the constant temperature of 30 ℃ and the rotating speed of 3000r/min, adding salicylic acid and modified basalt fiber, stirring for 1h at the constant temperature of 30 ℃ and the rotating speed of 3000r/min to obtain a dispersion liquid, filtering the dispersion liquid, drying a filtered product for 24h at the temperature of 85 ℃, and grinding for 1h to obtain modified metakaolin; wherein the mass ratio of the metakaolin, the silane coupling agent, the salicylic acid, the hydroxylated polypropylene fiber and the modified basalt fiber is 1:0.06:0.004:0.03:0.03; the mass ratio of the silane coupling agent to the ethanol aqueous solution is 1:100, respectively; the silane coupling agent comprises at least one of 3-aminopropyltriethoxysilane and 3-aminopropyltrimethoxysilane;
wherein the preparation of the high-strength waterproof concrete for building construction in the step (4) comprises: mixing 60-80 parts of fly ash and 40-60 parts of epoxy resin diluted by heating to 40-60 ℃, stirring for 10-20min under the condition of stirring speed of 1000rpm, adding 600-700 parts of sand, and stirring for 5-10min under the condition of stirring speed of 1000 rpm; then adding 250-350 parts of cement and 1000-1200 parts of stone, and stirring for 20-30min under the condition that the stirring speed is 1000 rpm; then adding 0.12-0.18 part of sodium citrate, 1-1.4 parts of sodium sulfate, 0.75-1.05 parts of aluminum silicate, 0.25-0.35 part of methyl sodium silicate, 30-50 parts of modified metakaolin, 1.25-2.5 parts of expanding agent, 5-7 parts of compacting agent, 5-10 parts of water reducing agent, 0.1-0.5 part of defoaming agent and 140-160 parts of water, and stirring for 30-60min under the condition that the stirring speed is 800rpm to obtain the high-strength waterproof concrete for building construction; the epoxy resin is bisphenol A epoxy resin, the diluent for diluting the bisphenol A epoxy resin comprises one or more of benzyl alcohol, toluene and xylene, and the diluent is diluted by 70 parts by mass per 100 parts by mass of the bisphenol A epoxy resin.
2. The method for preparing high-strength waterproof concrete for building construction according to claim 1, wherein the cleaning treatment of polypropylene fiber in the step (1) comprises: soaking the polypropylene fiber in 40-60% acetone water solution for 1h, soaking in 20-30% ethanol water solution for 1h, and ultrasonically cleaning in deionized water for 20min at the ultrasonic frequency of 150kHz and the ultrasonic power of 1000W to obtain the cleaned polypropylene fiber.
3. The method for preparing high-strength waterproof concrete for building construction according to claim 2, wherein the preparation of the polypropylene fiber with rough surface in the step (1) comprises: soaking the cleaned polypropylene fiber in 30-50wt% sulfuric acid water solution for 1.5h, washing with 20-30% ethanol water solution by volume fraction for 3 times, washing with deionized water for 3 times, and drying at 60-80 deg.C for 6-12h to obtain polypropylene fiber with rough surface.
4. The method for preparing high-strength waterproof concrete for building construction according to claim 3, wherein the preparation of the hydroxylated polypropylene fiber in the step (1) comprises: sequentially adding the polypropylene fibers with rough surfaces into aqueous solutions of 2wt%, 5wt% and 10wt% of hydrogen peroxide, respectively reacting for 2-3h at the temperature of 95-100 ℃ and the stirring speed of 3000r/min, washing for 3 times by using deionized water after the reaction is finished, and drying for 4-6h at the temperature of 40-60 ℃ to obtain hydroxylated polypropylene fibers; wherein, 0.2g of polypropylene fiber with rough surface is added into every milliliter of hydrogen peroxide water solution.
5. The method for preparing high-strength waterproof concrete for house construction according to claim 4, wherein the pretreatment of basalt fiber in the step (2) comprises: mixing basalt fibers with 40-60% by volume of acetone aqueous solution according to the weight ratio of 1:20, heating to 80-100 ℃, condensing and refluxing for 12-48h to obtain the basalt fiber with surface impurities removed, washing with deionized water for 3 times, and drying at 80 ℃ for 6h to obtain the pretreated basalt fiber.
6. The method for preparing high-strength waterproof concrete for house construction according to claim 5, wherein the preparation of the modified basalt fiber in the step (2) comprises: pre-treated basalt fibers, an aminosilane coupling agent, ethanol and deionized water are mixed according to the weight ratio of 100:1:4: (0.1-0.5), reacting for 2-4h at 50-70 ℃ and a stirring speed of 3000r/min, washing for 4 times by using deionized water after the reaction is finished, and drying for 5h at 100 ℃ to obtain the modified basalt fiber; wherein the aminosilane coupling agent comprises at least one of 3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropylmethyldiethoxysilane or 3- [2- (2-aminoethylamino) ethylamino ] propyl-trimethoxysilane.
7. A high-strength waterproof concrete for building construction prepared by the method of claim 6.
8. A high-strength waterproof concrete block for building construction prepared by using the high-strength waterproof concrete for building construction according to claim 7, wherein the high-strength waterproof concrete for building construction is poured into a block model of a carbon dioxide chamber after being stirred at a rotation speed of 800r/min for 5min; and vacuumizing the interior of the carbon dioxide guard chamber, filling carbon dioxide with the concentration of 100%, controlling the introduction amount of the carbon dioxide to enable the pressure in the carbon dioxide guard chamber to be 0.6Bar, and maintaining for 4 hours to obtain the high-strength waterproof concrete brick for building.
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