CN115304336B - Heat-resistant corrosion-resistant light foam concrete and preparation method thereof - Google Patents

Heat-resistant corrosion-resistant light foam concrete and preparation method thereof Download PDF

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CN115304336B
CN115304336B CN202211112798.XA CN202211112798A CN115304336B CN 115304336 B CN115304336 B CN 115304336B CN 202211112798 A CN202211112798 A CN 202211112798A CN 115304336 B CN115304336 B CN 115304336B
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glass fiber
resistant
heat
foam concrete
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CN115304336A (en
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景帅帅
安百平
张�成
赵桂云
唐哲
陈雁飞
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Shandong Tianyuan Green Building Technology Co ltd
Tianyuan Construction Group Co Ltd
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Shandong Tianyuan Green Building Technology Co ltd
Tianyuan Construction Group 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
    • C03C25/10—Coating
    • C03C25/1025—Coating to obtain fibres used for reinforcing cement-based products
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
    • C03C25/10—Coating
    • C03C25/465—Coatings containing composite materials
    • C03C25/47—Coatings containing composite materials containing particles, fibres or flakes, e.g. in a continuous phase
    • 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
    • C04B14/42—Glass
    • 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
    • C04B28/06—Aluminous 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
    • 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
    • C04B28/34—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 cold phosphate binders
    • C04B28/344—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 cold phosphate binders the phosphate binder being present in the starting composition solely as one or more phosphates
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/40—Porous or lightweight 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
    • C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
    • 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
    • C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
    • C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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    • 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 discloses heat-resistant corrosion-resistant light foam concrete and a preparation method thereof, belonging to the technical field of building materials. The lightweight foam concrete is prepared from the following raw materials in parts by weight: 40-70 parts of gel material, 20-40 parts of fly ash, 10-20 parts of fine sand, 10-20 parts of inorganic powder, 6-15 parts of modified glass fiber, 3-10 parts of foaming agent, 0.01-0.05 part of foam stabilizer and 0.1-2 parts of additive. According to the invention, the raw materials for preparing the foam concrete are scientifically proportioned and selected, the two-step modified glass fiber is doped, the stable formation and uniform distribution of the microporous foam are facilitated, the heat resistance and corrosion resistance of the foam mixed soil are greatly improved, the operation method is simple and convenient, no pollutant is generated, and the application field of the foam concrete can be greatly expanded.

Description

Heat-resistant corrosion-resistant light foam concrete and preparation method thereof
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to heat-resistant corrosion-resistant light foam concrete and a preparation method thereof.
Background
The foam concrete is also named as foam concrete, is a novel energy-saving environment-friendly building material, and has the following main characteristics: light weight, good heat insulation performance, good sound insulation and fire resistance, strong waterproof performance, good environmental protection performance and the like. Therefore, the foam concrete can be applied to occasions which cannot be met by common concrete and have special performance requirements.
The foam concrete has no heavy coarse aggregate and has rather partial volume occupied by bubbles, so that it has obvious light weight characteristic, and is especially suitable for inner wall material and other non-load bearing structure material of high-rise building to reduce the dead weight of high-rise building. The foam concrete contains a large amount of bubbles, and the foam concrete has low heat conductivity and good sound insulation performance, so that the foam concrete is particularly suitable for occasions with high requirements on sound insulation, such as recording sheds, broadcasting rooms, film and television product workshops and the like; the heat insulation, fire prevention and heat preservation characteristics of the building material make the building material especially suitable for the wall or roof material of the building in cold regions or hot regions so as to improve the energy efficiency. The porous low-strength and low elastic modulus properties of the hardened foam concrete allow it to maintain integral contact with the surrounding adjacent materials, absorb and disperse the stresses generated by external loads well, and are thus particularly suitable for use as a filling material between highway foundations or large civil structures. Therefore, it can be said that the foamed concrete is a multifunctional and multipurpose environment-friendly material which meets the characteristics and requirements of modern buildings.
However, the prior foam concrete has the following problems:
firstly, the preparation process of the foam concrete is usually to prepare foam by a mechanical method from a foaming agent aqueous solution, then add the foam into slurry consisting of siliceous materials, calcareous materials, water, various additives and the like, and then mix, stir, cast, form and maintain the foam concrete. In the process of pouring the slurry added with the foam into a mold for molding, the pressure of bubbles at different heights in the mold is different, and under the action of gravity, the pressure of the foam at the bottom of the mold is higher, so that the compression deformation of the foam is larger, and the average pore diameter of the bottom of the molded foam concrete is smaller than that of the top of the molded foam concrete, so that the pore distribution is uneven; the smaller average pore size at the bottom results in increased density of the foamed concrete, while the larger average pore size at the top results in decreased strength of the foamed concrete, thereby affecting the overall performance of the foamed concrete.
Secondly, the heat resistance and corrosion resistance of the foam concrete are insufficient, and a plurality of patents in the aspect of the foam concrete appear in recent years, such as patent application No. 201310233030.2, the foam concrete and the preparation method thereof, wherein the introduced foam concrete has better waterproof, soundproof and heat insulation effects than the existing foam concrete, but has no change in the aspects of high temperature resistance, chlorine ion resistance, sulfate ion resistance, magnesium ion resistance and the like, and has poor anti-corrosion capability; the invention patent application number 201210192851.1 discloses a foam concrete material and foam concrete introduced in the preparation method thereof, wherein the foam concrete is prepared from waste slurry, which is beneficial to environmental protection, but the defects of the foam concrete in the aspects of erosion resistance, ultrahigh temperature resistance and strength still exist. Therefore, how to solve the problems inherent in the two aspects of the prior foam concrete greatly expands the practical application field of the foam concrete.
Disclosure of Invention
Aiming at the inherent defects of the foam concrete in the prior art, the invention develops a heat-resistant and corrosion-resistant high-stability concrete material which is suitable for various complex building environments.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
the heat-resistant corrosion-resistant light foam concrete is prepared from the following raw materials in parts by weight: 40-70 parts of gel material, 20-40 parts of fly ash, 10-20 parts of fine sand, 10-20 parts of inorganic powder, 6-15 parts of modified glass fiber, 3-10 parts of foaming agent, 0.01-0.05 part of foam stabilizer and 0.1-2 parts of additive.
Further, the gel material is ordinary portland cement, sulphoaluminate cement or phosphoaluminate cement.
Further, the inorganic powder is one or more of silica brick powder, fine ground glass powder, blast furnace slag powder or nano clay.
Further, the preparation method of the modified glass fiber comprises the following steps: adding glass fiber and silane coupling agent into absolute ethyl alcohol, heating and stirring at constant temperature of 40-45 ℃ in water bath for reaction for 1-2h to obtain reaction liquid A; then adding epoxy resin accounting for 5-10% of the mass of the reaction liquid A, and stirring and reacting at the constant temperature of 80-90 ℃ for 1-2h to obtain reaction liquid B; and mixing the reaction solution B with a silver nitrate solution, reacting the mixed solution in a reaction kettle for 3-5 hours, washing with acid and water, and drying to obtain the modified glass fiber.
Furthermore, the mass volume ratio of the glass fiber, the silane coupling agent and the absolute ethyl alcohol is 10-30g:1-5ml:50-100ml.
Furthermore, the volume ratio of the reaction solution B to the silver nitrate solution is 1.
Further, the foaming agent is H 2 O 2 One or more of aluminum powder paste, resin soap foaming agent and rosin acid soap foaming agent.
Further, the foam stabilizer is one or more of polyvinyl alcohol, alpha-sodium alkenyl sulfonate or dodecyl dimethyl amine oxide.
Further, the admixture is an early strength agent and/or a water reducing agent, the early strength agent is anhydrous sodium sulphate, and the water reducing agent is a high-efficiency polycarboxylic acid water reducing agent.
A preparation method of heat-resistant corrosion-resistant light foam concrete comprises the following steps:
(1) Preparing modified glass fiber: adding glass fiber and silane coupling agent into absolute ethyl alcohol, heating and stirring at constant temperature of 40-45 ℃ in a water bath for reaction for 1-2h to obtain reaction liquid A, adding epoxy resin accounting for 5-10% of the mass of the reaction liquid A, and stirring at constant temperature of 80-90 ℃ for reaction for 1-2h to obtain reaction liquid B; mixing the reaction solution B with a silver nitrate solution, reacting the mixed solution in a reaction kettle for 3-5 hours, washing with acid and water, and drying to obtain modified glass fiber;
(2) Mixing a gel material, fly ash, fine sand, inorganic powder and modified glass fiber into powder according to a ratio, uniformly mixing the powder and water according to a water-cement ratio of 0.4-0.7, adding a foaming agent, a foam stabilizer and an additive, and fully stirring and foaming to obtain the foam concrete.
The strength performance and stability and corrosion resistance of the foam concrete are poor, and the pore parameter performance of the foam concrete is improved by improving the strength performance and stability and durability of the concrete because pores in the concrete are distributed unevenly and a large number of interconnected pores exist.
The invention modifies two parts of the glass fiber and dopes the glass fiber into the foam concrete to improve the heat resistance and corrosion resistance of the matrix. Firstly, the silane coupling agent and the epoxy resin are mixed and modified, so that the surface roughness of the fiber is improved, and the adhesiveness to a concrete matrix and heat-resistant inorganic powder is enhanced; secondly, the concrete is compounded with nano silver particles, so that the penetration of chloride ions and sulfate can be effectively prevented, the corrosion of reinforcing steel bars can be prevented, and the durability and the corrosion resistance of concrete can be improved; the fiber modified by the two steps can effectively divide bubbles, so that the pore diameter of the bubbles is smaller and the distribution of the bubbles is more uniform, the bubbles are protected to form closed pores, and the pore structure is improved. Meanwhile, the modified fibers can be effectively interwoven and inserted among the holes to tightly connect the holes, so that the strength of the foam concrete is enhanced, the toughness and the formability of the foam concrete are improved, the overall performance of the concrete is greatly improved, and the application field of the foam concrete is widened.
Advantageous effects
According to the invention, the raw materials for preparing the foam concrete are scientifically proportioned and selected, and the two-step modified glass fiber is doped, so that the stable formation and uniform distribution of the microporous foam are facilitated, the heat resistance and the corrosion resistance of the foam mixed soil are greatly improved, the operation method is simple and convenient, no pollutant is generated, and the application field of the foam concrete can be greatly expanded.
Drawings
FIG. 1 is an electron microscope image of the internal pore structure of the foam concrete obtained in example 4 of the present invention.
Detailed Description
The technical solution of the present invention is further described below with reference to specific embodiments, but is not limited thereto.
Example 1
The heat-resistant corrosion-resistant light foam concrete is prepared from the following raw materials in parts by weight: 40 parts of gel material, 20 parts of fly ash, 10 parts of fine sand, 10 parts of inorganic powder, 6 parts of modified glass fiber, 3 parts of foaming agent, 0.01 part of foam stabilizer and 0.1 part of additive.
The gel material is ordinary portland cement.
The inorganic powder is silica brick powder.
The preparation method of the modified glass fiber comprises the following steps: adding glass fiber and a silane coupling agent into absolute ethyl alcohol, heating and stirring at constant temperature of 40 ℃ in a water bath for reaction for 1h to obtain a reaction solution A; then adding epoxy resin accounting for 5 percent of the mass of the reaction liquid A, and stirring and reacting for 1 hour at the constant temperature of 80 ℃ to obtain reaction liquid B; and mixing the reaction solution B with a silver nitrate solution, reacting the mixed solution in a reaction kettle for 3 hours, washing with acid and water, and drying to obtain the modified glass fiber.
The mass volume ratio of the glass fiber, the silane coupling agent and the absolute ethyl alcohol is 10g:1ml:50ml.
The volume ratio of the reaction solution B to the silver nitrate solution was 1.
The foaming agent is H 2 O 2 。
The foam stabilizer is polyvinyl alcohol.
The additive is an early strength agent anhydrous sodium sulphate.
A preparation method of heat-resistant corrosion-resistant light foam concrete comprises the following steps:
(1) Preparing modified glass fiber: adding glass fiber and a silane coupling agent into absolute ethyl alcohol, heating and stirring at constant temperature of 40 ℃ in a water bath for reaction for 1h to obtain a reaction solution A, adding epoxy resin accounting for 5% of the mass of the reaction solution A, and stirring at constant temperature of 80 ℃ for reaction for 1h to obtain a reaction solution B; mixing the reaction solution B with a silver nitrate solution, reacting the mixed solution in a reaction kettle for 3 hours, washing with acid and water, and drying to obtain modified glass fibers;
(2) Mixing a gel material, fly ash, fine sand, inorganic powder and modified glass fiber into powder according to a ratio, uniformly mixing the powder and water according to a water-cement ratio of 0.4, adding a foaming agent, a foam stabilizer and an additive, and fully stirring and foaming to obtain the foam concrete.
Example 2
The heat-resistant corrosion-resistant light foam concrete is prepared from the following raw materials in parts by weight: 50 parts of gel material, 30 parts of fly ash, 15 parts of fine sand, 13 parts of inorganic powder, 9 parts of modified glass fiber, 5 parts of foaming agent, 0.03 part of foam stabilizer and 0.5 part of additive.
The gel material is sulphoaluminate cement.
The inorganic powder is finely ground glass powder.
The preparation method of the modified glass fiber comprises the following steps: adding glass fiber and a silane coupling agent into absolute ethyl alcohol, heating and stirring at constant temperature of 40 ℃ in a water bath for reaction for 1h to obtain a reaction solution A; then adding epoxy resin with the mass of 6% of that of the reaction liquid A, and stirring and reacting at the constant temperature of 80 ℃ for 1h to obtain reaction liquid B; and mixing the reaction solution B with a silver nitrate solution, reacting the mixed solution in a reaction kettle for 3 hours, washing with acid and water, and drying to obtain the modified glass fiber.
The mass volume ratio of the glass fiber, the silane coupling agent and the absolute ethyl alcohol is 10g:2ml:60ml.
The volume ratio of the reaction solution B to the silver nitrate solution was 1.
The foaming agent is aluminum powder paste.
The foam stabilizer is alpha-sodium alkenyl sulfonate.
The additive is a high-efficiency polycarboxylic acid water reducing agent.
A preparation method of heat-resistant corrosion-resistant light foam concrete comprises the following steps:
(1) Preparing modified glass fiber: adding glass fiber and a silane coupling agent into absolute ethyl alcohol, heating and stirring at constant temperature of 40 ℃ in a water bath for reaction for 1h to obtain a reaction solution A, adding epoxy resin accounting for 6% of the mass of the reaction solution A, and stirring at constant temperature of 80 ℃ for reaction for 1h to obtain a reaction solution B; mixing the reaction solution B with a silver nitrate solution, reacting the mixed solution in a reaction kettle for 3 hours, washing with acid and water, and drying to obtain modified glass fibers;
(2) Mixing a gel material, fly ash, fine sand, inorganic powder and modified glass fiber into powder according to a ratio, uniformly mixing the powder and water according to a water-cement ratio of 0.4, adding a foaming agent, a foam stabilizer and an additive, and fully stirring and foaming to obtain the foam concrete.
Example 3
The heat-resistant corrosion-resistant light foam concrete is prepared from the following raw materials in parts by weight: 60 parts of gel material, 35 parts of fly ash, 17 parts of fine sand, 16 parts of inorganic powder, 12 parts of modified glass fiber, 8 parts of foaming agent, 0.04 part of foam stabilizer and 1 part of additive.
The gel material is aluminophosphate-based cement.
The inorganic powder is blast furnace slag powder.
The preparation method of the modified glass fiber comprises the following steps: adding glass fiber and silane coupling agent into absolute ethyl alcohol, heating and stirring for reaction for 2 hours at constant temperature of 45 ℃ in water bath to obtain reaction liquid A; then adding epoxy resin accounting for 10% of the mass of the reaction liquid A, and stirring and reacting for 2 hours at the constant temperature of 90 ℃ to obtain reaction liquid B; and mixing the reaction solution B with a silver nitrate solution, reacting the mixed solution in a reaction kettle for 5 hours, washing with acid and water, and drying to obtain the modified glass fiber.
The mass volume ratio of the glass fiber to the silane coupling agent to the absolute ethyl alcohol is 30g:5ml:100ml.
The volume ratio of the reaction solution B to the silver nitrate solution was 1.
The foaming agent is resin soap foaming agent.
The foam stabilizer is dodecyl dimethyl amine oxide.
The admixture is formed by mixing an early strength agent and a water reducing agent according to the mass ratio of 1.
A preparation method of heat-resistant corrosion-resistant light foam concrete comprises the following steps:
(1) Preparing modified glass fiber: adding glass fiber and a silane coupling agent into absolute ethyl alcohol, heating and stirring for reaction for 2 hours at constant temperature of 45 ℃ in a water bath to obtain a reaction liquid A, adding epoxy resin accounting for 10% of the mass of the reaction liquid A, and stirring for reaction for 2 hours at constant temperature of 90 ℃ to obtain a reaction liquid B; mixing the reaction solution B with a silver nitrate solution, reacting the mixed solution in a reaction kettle for 5 hours, washing with acid and water, and drying to obtain modified glass fibers;
(2) Mixing a gel material, fly ash, fine sand, an inorganic powder and modified glass fiber into powder according to a ratio, uniformly mixing the powder and water according to a water-cement ratio of 0.4, adding a foaming agent, a foam stabilizer and an additive, and fully stirring and foaming to obtain the foam concrete.
Example 4
The heat-resistant corrosion-resistant light foam concrete is prepared from the following raw materials in parts by weight: 70 parts of gel material, 40 parts of fly ash, 20 parts of fine sand, 20 parts of inorganic powder, 15 parts of modified glass fiber, 10 parts of foaming agent, 0.05 part of foam stabilizer and 2 parts of additive.
The gel material is ordinary portland cement.
The inorganic powder is nano clay.
The preparation method of the modified glass fiber comprises the following steps: adding glass fiber and a silane coupling agent into absolute ethyl alcohol, heating and stirring at constant temperature of 45 ℃ in a water bath for reaction for 2 hours to obtain a reaction solution A; then adding epoxy resin accounting for 10% of the mass of the reaction liquid A, and stirring and reacting at the constant temperature of 90 ℃ for 2 hours to obtain reaction liquid B; and mixing the reaction solution B with a silver nitrate solution, reacting the mixed solution in a reaction kettle for 5 hours, washing with acid and water, and drying to obtain the modified glass fiber.
The mass volume ratio of the glass fiber, the silane coupling agent and the absolute ethyl alcohol is 30g:5ml:100ml.
The volume ratio of the reaction solution B to the silver nitrate solution was 1.
The foaming agent is a rosin acid soap foaming agent.
The foam stabilizer is polyvinyl alcohol.
The admixture is obtained by mixing an early strength agent and a water reducing agent according to the mass ratio of 1.
A preparation method of heat-resistant corrosion-resistant light foam concrete comprises the following steps:
(1) Preparing modified glass fiber: adding glass fiber and a silane coupling agent into absolute ethyl alcohol, heating and stirring for reaction for 2 hours at constant temperature of 45 ℃ in a water bath to obtain a reaction liquid A, adding epoxy resin accounting for 10% of the mass of the reaction liquid A, and stirring for reaction for 2 hours at constant temperature of 90 ℃ to obtain a reaction liquid B; mixing the reaction solution B with a silver nitrate solution, reacting the mixed solution in a reaction kettle for 5 hours, washing with acid and water, and drying to obtain modified glass fibers;
(2) Mixing a gel material, fly ash, fine sand, an inorganic powder and modified glass fiber into powder according to a ratio, uniformly mixing the powder and water according to a water-cement ratio of 0.4, adding a foaming agent, a foam stabilizer and an additive, and fully stirring and foaming to obtain the foam concrete.
Comparative example 1
The heat-resistant corrosion-resistant light foam concrete is prepared from the following raw materials in parts by weight: 70 parts of gel material, 40 parts of fly ash, 20 parts of fine sand, 20 parts of inorganic powder, 15 parts of modified glass fiber, 10 parts of foaming agent, 0.05 part of foam stabilizer and 2 parts of additive.
The gel material is ordinary portland cement.
The inorganic powder is nano clay.
The preparation method of the modified glass fiber comprises the following steps: adding glass fiber into absolute ethyl alcohol, heating and stirring at constant temperature of 45 ℃ in water bath for reaction for 2 hours to obtain reaction liquid A; (ii) a And mixing the reaction solution A with a silver nitrate solution, reacting the mixed solution in a reaction kettle for 5 hours, washing with acid and water, and drying to obtain the modified glass fiber.
The mass volume ratio of the glass fiber to the absolute ethyl alcohol is 30g:100ml.
The volume ratio of the reaction solution a to the silver nitrate solution was 1.
The foaming agent is a rosin acid soap foaming agent.
The foam stabilizer is polyvinyl alcohol.
The admixture is obtained by mixing an early strength agent and a water reducing agent according to the mass ratio of 1.
A preparation method of heat-resistant corrosion-resistant light foam concrete comprises the following steps:
(1) Preparing modified glass fiber: adding glass fiber into absolute ethyl alcohol, heating and stirring at constant temperature of 45 ℃ in water bath for reaction for 2 hours to obtain reaction liquid A; (ii) a Mixing the reaction solution A with a silver nitrate solution, reacting the mixed solution in a reaction kettle for 5 hours, washing with acid and water, and drying to obtain modified glass fiber;
(2) Mixing a gel material, fly ash, fine sand, an inorganic powder and modified glass fiber into powder according to a ratio, uniformly mixing the powder and water according to a water-cement ratio of 0.4, adding a foaming agent, a foam stabilizer and an additive, and fully stirring and foaming to obtain the foam concrete.
This comparative example is similar in part to example 4 in the raw materials and preparation method, except that the silane and epoxy resin modification of the glass fiber in the first step is not performed.
Comparative example 2
The heat-resistant corrosion-resistant light foam concrete is prepared from the following raw materials in parts by weight: 70 parts of gel material, 40 parts of fly ash, 20 parts of fine sand, 20 parts of inorganic powder, 15 parts of modified glass fiber, 10 parts of foaming agent, 0.05 part of foam stabilizer and 2 parts of additive.
The gel material is ordinary portland cement.
The inorganic powder is nano clay.
The preparation method of the modified glass fiber comprises the following steps: adding glass fiber and a silane coupling agent into absolute ethyl alcohol, heating and stirring at constant temperature of 45 ℃ in a water bath for reaction for 2 hours to obtain a reaction solution A; then adding epoxy resin accounting for 10% of the mass of the reaction liquid A, and stirring and reacting at the constant temperature of 90 ℃ for 2 hours to obtain reaction liquid B; and drying to obtain the modified glass fiber.
The mass volume ratio of the glass fiber, the silane coupling agent and the absolute ethyl alcohol is 30g:5ml:100ml.
The foaming agent is a rosin acid soap foaming agent.
The foam stabilizer is polyvinyl alcohol.
The admixture is obtained by mixing an early strength agent and a water reducing agent according to the mass ratio of 1.
A preparation method of heat-resistant corrosion-resistant light foam concrete comprises the following steps:
(1) Preparing modified glass fiber: adding glass fiber and a silane coupling agent into absolute ethyl alcohol, heating and stirring for reaction for 2 hours at constant temperature of 45 ℃ in a water bath to obtain a reaction liquid A, adding epoxy resin accounting for 10% of the mass of the reaction liquid A, and stirring for reaction for 2 hours at constant temperature of 90 ℃ to obtain a reaction liquid B; drying to obtain modified glass fiber;
(2) Mixing a gel material, fly ash, fine sand, an inorganic powder and modified glass fiber into powder according to a ratio, uniformly mixing the powder and water according to a water-cement ratio of 0.4, adding a foaming agent, a foam stabilizer and an additive, and fully stirring and foaming to obtain the foam concrete.
The comparative example was carried out as in example 4 except that the second silver nitrate modification of the glass fibers was not carried out.
Comparative example 3
The heat-resistant corrosion-resistant light foam concrete is prepared from the following raw materials in parts by weight: 70 parts of gel material, 40 parts of fly ash, 20 parts of fine sand, 20 parts of inorganic powder, 15 parts of glass fiber, 10 parts of foaming agent, 0.05 part of foam stabilizer and 2 parts of additive.
The gel material is ordinary portland cement.
The inorganic powder is nano clay.
The foaming agent is a rosin acid soap foaming agent.
The foam stabilizer is polyvinyl alcohol.
The admixture is obtained by mixing an early strength agent and a water reducing agent according to the mass ratio of 1.
A preparation method of heat-resistant corrosion-resistant light foam concrete comprises the following steps:
(1) Mixing a gel material, fly ash, fine sand, inorganic powder and glass fiber into powder according to a ratio, uniformly mixing the powder and water according to a water-cement ratio of 0.4, adding a foaming agent, a foam stabilizer and an additive, and fully stirring and foaming to obtain the foam concrete.
This comparative example is similar to example 4 in part in the raw materials and preparation method except that the glass fiber is not modified, i.e., the glass fiber is used directly.
Performance test
The foam concrete obtained in the embodiment and the comparative example of the invention is subjected to performance test, and the basic parameters of the foam concrete, such as heat conductivity, compressive strength and the like, are tested according to the standard foam concrete JG/T266-2011;
pore structure analysis
When the micro-observation hole structure is tested, a test piece with the thickness of 100mm multiplied by 100mm is firstly half-cut, the section is a surface to be tested, and then a DJCK-2 type crack width measuring instrument manufactured by a precise distance instrument is used for shooting the section hole structure.
Concrete Cl resistance according to ASTM1202 - The Cl-permeability rapid determination method in Permeability electric measurement and JTJ275-2000 technical Specification for anticorrosion of concrete structure in harbor engineering measures the electric flux.
The erosion test is carried out by reference to K method in GB/T749-2008 'test method for sulfate resistance of cement'.
The performance test results are shown in table 1:
TABLE 1 Performance test results
Figure BDA0003844221970000091
As can be seen from the data in the table, the foam concrete obtained in the embodiment of the invention has the advantages of good fire resistance, high compressive strength, low electric flux, poor chloride ion permeability and good sulfate erosion resistance. And comparative examples 1 to 3 in which the key modification means are changed, the synergistic effect between the two steps of modification disappears, and the comprehensive performance of the foam concrete is reduced. From the SEM image of the appearance of the concrete microtube obtained in the embodiment 4 of the invention in FIG. 1, it can be seen that the foam concrete matrix of the invention has uniform pores and few through holes, which is the root of excellent performance.
It should be noted that the above-mentioned embodiments are only some of the preferred modes for implementing the invention, and not all embodiments. Obviously, all other embodiments obtained by persons of ordinary skill in the art based on the above-mentioned embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.

Claims (9)

1. The heat-resistant corrosion-resistant light foam concrete is characterized by being prepared from the following raw materials in parts by weight: 40-70 parts of gel material, 20-40 parts of fly ash, 10-20 parts of fine sand, 10-20 parts of inorganic powder, 6-15 parts of modified glass fiber, 3-10 parts of foaming agent, 0.01-0.05 part of foam stabilizer and 0.1-2 parts of additive;
the preparation method of the modified glass fiber comprises the following steps: adding glass fiber and silane coupling agent into anhydrous ethanol, and performing water bath at 40-45 deg.C
Heating and stirring at constant temperature for 1-2h to obtain reaction liquid A; then adding epoxy resin with the mass of 5-10% of the reaction liquid A and 80-90 DEG C
Stirring and reacting for 1-2h at constant temperature to obtain reaction liquid B; and mixing the reaction solution B with a silver nitrate solution, reacting the mixed solution in a reaction kettle for 3-5 hours, washing with acid and water, and drying to obtain the modified glass fiber.
2. The heat and corrosion resistant lightweight foamed concrete according to claim 1, wherein said gel material is ordinary portland cement, sulphoaluminate cement, or phosphoaluminate-based cement.
3. The heat-resistant corrosion-resistant lightweight foam concrete according to claim 1, wherein the inorganic powder is one or more of silica brick powder, fine ground glass powder, blast furnace slag powder or nano clay.
4. The heat-resistant corrosion-resistant light-weight foamed concrete according to claim 1, wherein the mass volume ratio of the glass fiber, the silane coupling agent and the absolute ethyl alcohol is 10-30g:1-5ml:50-100ml.
5. The heat-resistant corrosion-resistant lightweight foam concrete according to claim 1, wherein the volume ratio of the reaction solution B to the silver nitrate solution is 1.
6. The heat and corrosion resistant lightweight foamed concrete according to claim 1, wherein said blowing agent is H 2 O 2 One or more of aluminum powder paste, resin soap foaming agent and rosin acid soap foaming agent.
7. The heat-resistant corrosion-resistant light-weight foamed concrete according to claim 1, wherein the foam stabilizer is one or more of polyvinyl alcohol, sodium alpha-alkenyl sulfonate or dodecyl dimethyl amine oxide.
8. The heat-resistant corrosion-resistant light foam concrete according to claim 1, wherein the additive is an early strength agent and/or a water reducing agent, the early strength agent is anhydrous sodium sulphate, and the water reducing agent is a high-efficiency polycarboxylic acid water reducing agent.
9. A method for preparing a heat and corrosion resistant lightweight foamed concrete according to any one of claims 1 to 8, comprising the steps of:
(1) Preparing modified glass fiber: adding glass fiber and silane coupling agent into anhydrous ethanol, heating and stirring at constant temperature of 40-45 deg.C in water bath for reaction for 1-2h to obtain reaction solution A, adding epoxy resin 5-10 wt% of the reaction solution A, and 80-90 deg.C
Stirring and reacting for 1-2h at constant temperature to obtain reaction liquid B; mixing the reaction solution B with a silver nitrate solution, reacting the mixed solution in a reaction kettle for 3-5 hours, washing with acid and water, and drying to obtain modified glass fiber;
(2) Mixing a gel material, fly ash, fine sand, inorganic powder and modified glass fiber into powder according to a ratio, uniformly mixing the powder and water according to a water-cement ratio of 0.4-0.7, adding a foaming agent, a foam stabilizer and an additive, and fully stirring and foaming to obtain the foam concrete.
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