CN113372069B - Light building sound insulation material based on fly ash - Google Patents

Light building sound insulation material based on fly ash Download PDF

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CN113372069B
CN113372069B CN202110805544.5A CN202110805544A CN113372069B CN 113372069 B CN113372069 B CN 113372069B CN 202110805544 A CN202110805544 A CN 202110805544A CN 113372069 B CN113372069 B CN 113372069B
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fly ash
water
insulation material
sound insulation
cement
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CN113372069A (en
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王雷
柳立生
吴博
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Wuchang University of Technology
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Wuchang University of Technology
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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
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/02—Agglomerated materials, e.g. artificial aggregates
    • C04B18/027—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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/08—Flue dust, i.e. fly ash
    • 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
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
    • 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
    • C04B2111/00017—Aspects relating to the protection of the environment
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/52—Sound-insulating materials
    • 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 a light building sound insulation material based on fly ash. The sound insulation material is made of foam concrete, and dry materials of the sound insulation material comprise: cement, fly ash, ceramsite, water reducing agent, modified titanium dioxide, foaming agent, foam stabilizer, coagulant and early strength agent. The sound insulation material has excellent mechanical, heat insulation, carbonization resistance and waterproof properties, and the sludge-based ceramsite prepared from the raw materials of municipal sludge and building waste soil is added into the raw materials, so that the material has a good sound insulation effect, and the recycling of municipal solid waste is realized.

Description

Light building sound insulation material based on fly ash
Technical Field
The invention relates to the technical field of building materials, in particular to a light building sound insulation material based on fly ash.
Background
The foam concrete is prepared by introducing a proper amount of fine bubbles into cement paste or cement mortar, uniformly stirring and pouring hardened concrete. The most important difference between the foam concrete and the common concrete in the composition materials is that the foam concrete has no coarse aggregate used in the common concrete and simultaneously contains a large amount of air bubbles, and the foam concrete has remarkable light weight property because the foam concrete does not contain heavy coarse aggregate and a considerable part of the volume is occupied by the air bubbles.
The light foam concrete is a light cellular material which is prepared by adding foam prepared by foaming agent aqueous solution into cement, sand and water by a physical method, adding some filling materials and common additives on the basis, and finally stirring, casting molding and curing. The filling material is most common by one of the current industrial waste residues with the largest discharge amount in China, so that the energy conservation and the environmental protection are realized, a large amount of cement and fine aggregate are saved, the workability of the cement is improved, the hydration heat and the thermal expansion property are reduced, and the impermeability of the foam concrete is improved.
The fly ash light foam concrete has the characteristics of light weight, heat preservation and insulation, sound and fire resistance, durability, shock resistance, environmental friendliness and the like, and is particularly suitable for occasions with high sound insulation requirements, such as recording sheds, broadcast rooms, film and television product workshops and the like, due to low heat conductivity and good sound insulation performance. The sound insulation material is an application approach of fly ash light foam concrete, but the comprehensive performance of the sound insulation material for the current building, such as compressive strength, heat insulation, waterproof and other effects, still need to be further improved, and the preparation process and cost still need to be improved.
Chinese patent CN 112723806A discloses a light heat-insulating high-strength concrete and a preparation method thereof, the invention takes cement, ceramsite composite microspheres, fly ash, cinder ash, water reducing agent, carbon fiber grafted with carbon nano tubes and foaming agent as raw materials, large ceramsite is firstly crushed for later use, and the concrete is prepared by batching, feeding, pouring, vibrating, removing a mould and maintaining, and the prepared concrete has low cost, energy conservation and environmental protection, and still has strong mechanical property and durability, but the sound insulation effect of the concrete is not researched.
Chinese patent CN 110451906 a discloses a light sound-insulating material and a preparation method thereof. The dry material of the light sound-insulating material comprises the following components: cement, dried sludge, silica fume, fly ash, gypsum powder, slag, shell powder, a water reducing agent and a foaming agent; the foaming agent is prepared by mixing polyacrylamide, polyethyleneimine, polyvinylpyrrolidone, hydroxypropyl methyl cellulose, triethanolamine, surface hydrophilic modified nano soil powder and a surfactant, and the foaming agent only researches sound insulation, density, compressive strength, heat insulation and water resistance, and does not research other properties such as carbonization resistance.
Disclosure of Invention
In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a lightweight building soundproof material based on fly ash with good soundproof effect and good comprehensive performance.
In order to achieve the purpose, the invention provides a preparation method of a light building sound insulation material based on fly ash, and the foam concrete prepared by the method has better mechanical, anti-carbonization, water absorption, heat insulation and sound insulation properties.
In order to achieve the purpose of the invention, the invention adopts the following technical scheme:
the preparation method of the light building sound insulation material based on the fly ash comprises the following steps:
(1) soaking the ceramsite in water, and draining the ceramsite for later use;
(2) uniformly stirring modified titanium dioxide and water, and then carrying out ultrasonic crushing to obtain a modified titanium dioxide suspension;
(3) diluting a foaming agent with water, and mixing the diluted foaming agent with a foam stabilizer to prepare foam with uniform size;
(4) uniformly stirring cement, fly ash, silica fume, ceramsite, water reducing agent, modified titanium dioxide suspension and water to obtain cement slurry;
(5) mixing the coagulant, the early strength agent and water, adding the mixture into the cement slurry obtained in the step (4), and stirring to obtain uniform fluid cement slurry;
(6) adding the foam prepared in the step (3) into the cement paste obtained in the step (5), and stirring until the foam cement slurry is in a uniform and stable state to obtain foam concrete;
(7) and uniformly injecting the prepared foam concrete into a mold, demolding after molding, and placing the demolded sample into a standard curing box for curing to obtain the lightweight building sound insulation material based on the fly ash.
Preferably, the preparation method of the light building sound insulation material based on the fly ash comprises the following steps:
(1) soaking 20-30 g of ceramsite in 40-60 g of water for 1-2 h, and draining the ceramsite for later use;
(2) weighing 1-12 g of modified titanium dioxide and 10-20 g of water, uniformly stirring, and then carrying out ultrasonic crushing to obtain a modified titanium dioxide suspension;
(3) diluting 0.5-1.5 g of foaming agent with 2-75 g of water, and mixing with 0.5-1.5 g of foam stabilizer to prepare foam with uniform size;
(4) weighing 200-300 g of cement, 1-30 g of fly ash, 1-30 g of silica fume, sludge-based ceramsite presoaked by water in the step (1), 5-10 g of water reducing agent, the modified titanium dioxide suspension obtained in the step (2) and 50-70 g of water, and uniformly stirring to obtain cement slurry;
(5) mixing 2-3 g of coagulant, 2-3 g of early strength agent and 20-40 g of water, adding the mixture into the cement slurry obtained in the step (4), and stirring for 2-3 minutes to obtain uniform fluid cement slurry;
(6) adding the foam prepared in the step (3) into the cement paste obtained in the step (5), and stirring until the foam cement slurry is in a uniform and stable state to obtain foam concrete;
(7) and uniformly injecting the prepared foam concrete into a mold, demolding after molding for 12-24 h, and placing the demolded sample into a standard curing box for curing to obtain the lightweight building sound insulation material based on the fly ash.
The preparation method of the modified titanium dioxide comprises the following steps:
(1) preparing carbon powder: weighing 20-25 g of glucose, and dissolving with 200-300 mL of distilled water; transferring the solution into an autoclave lined with polytetrafluoroethylene, and heating for 3-4 h at 160-200 ℃; centrifuging and collecting a product, and washing the product with distilled water and absolute ethyl alcohol in sequence; drying the obtained product in a vacuum drying oven at 70-80 ℃ for 2-4 hours to obtain carbon powder;
(2) preparing modified titanium dioxide: adding 0.2-0.4 g of carbon powder into a mixed solution of 1-2 g of ferric nitrate hydrate, 45-50 mL of absolute ethyl alcohol and 1-3 mL of distilled water; adding 20-40 mL of titanium butanol solution, heating to 60-80 ℃, stirring and reacting for 2-4 hours; and centrifuging, collecting the precipitate, washing with absolute ethyl alcohol, and drying the product in a vacuum drying oven at the temperature of 60-80 ℃ for 2-4 hours to obtain the modified titanium dioxide.
The active component of the fly ash is mainly aluminosilicate vitreous body, the aluminosilicate vitreous body is dissolved under the synergistic effect of modified titanium dioxide and other chemical substances, and hydrated calcium silicate gel (C-S-H) or hydrated calcium aluminosilicate gel (C-A-S-H) is generated after a series of complex chemical reactions, so that the modified titanium dioxide activates the fly ash to show the gelling property, cement can be partially replaced, and the mechanical property of fly ash concrete can be effectively improved by doping the fly ash modified by the modified titanium dioxide into concrete.
The cement is any one or the mixture of two or more of ordinary portland cement, portland slag cement, pozzolanic portland cement and composite portland cement.
Preferably, the cement is ordinary portland cement.
The fly ash is class II fly ash.
The particle size of the silica fume is 0.1-1 mu m; the preferred silica fume particle size is 0.1 to 0.3 μm, and the purity is 97%.
The ceramsite is sludge-based ceramsite, and the particle size of the ceramsite is 20-30 meshes.
In the step (2), the mass ratio of the foaming agent to the water is 1: 40 to 50.
In the step (3), the stirring time is 2-7 min, the rotating speed of the stirrer is 90-180/min, and the temperature of the slurry is 20-30 ℃.
The foaming agent is at least one surfactant selected from sulfate surfactants, sulfonate surfactants and fatty alcohol-polyoxyethylene ether;
preferably, the surfactant is at least one selected from sodium dodecyl sulfate, sodium dodecyl benzene sulfonate, AEO-7 and AEO-9.
The foam stabilizer is modified silicon resin polyether emulsion, and the polyether content is 55%.
The coagulant is Al (SO)4)3·18H2O。
The early strength agent is triethanolamine.
The water reducing agent is any one or the mixture of two or more of lignin sulfonate water reducing agent, naphthalene water reducing agent, melamine water reducing agent, sulfamate water reducing agent, fatty acid water reducing agent and polycarboxylic acid water reducing agent; preferably, the water reducing agent is a liquid polycarboxylic acid type high-efficiency water reducing agent, and the water reducing rate is 35-40%.
Preferably, in the lightweight building soundproof material based on fly ash, the mold can be selected according to the actual soundproof building needs, such as one of a plate mold, a brick mold, and a door mold.
The following are some of the components used in the lightweight building soundproofing material based on fly ash of the present invention:
(1) cement
The cement contains a large amount of calcareous components and is a main source of the strength of the foam concrete, and the ordinary portland cement selected by the invention is used as a gel material of the foam concrete, so that the cement has the advantages of better frost resistance, high setting speed, short maintenance time and good durability and workability.
(2) Fly ash
When the fly ash replaces part of common portland cement, the fly ash only plays a filling role in the initial curing stage, namely a large amount of fine fly ash particles can be filled into the pores of hydration products of cement and fly ash clinker minerals, and the original larger pores in the foam concrete sample are divided into a large amount of fine pores, so that the compactness of hardened slurry is improved, and the effect of refining the pore diameter of the sample is further played.
(3) Silica fume
The silicon ash is SiO generated in smelting of ferrosilicon and industrial silicon2And O in Si gas and air2The superfine siliceous powder material formed by rapid oxidation and condensation has high volcanic ash activity, plays a role in filling concrete, and calcium hydroxide generated by early hydration of cement can activate the volcanic ash reaction of silica fume.
(4) Ceramic particle
The haydite is an artificial light aggregate made up by using industrial waste slag or waste mineral waste and poor-quality shale as raw material, adding a small quantity of adhesive and additive through the processes of mixing, balling and high-temp. sintering, and features smooth and hard surface, cellular interior, high porosity, light volume weight, freeze-thaw resistance, excellent alkali-resistant aggregate reactivity and shock-proof and wear-resistant properties. The invention adopts the municipal sludge ceramsite/sludge-based ceramsite, and the lightweight high-strength ceramsite which takes municipal sludge, building waste soil and the like as main raw materials, effectively carries out solid waste treatment on the municipal sludge, and is beneficial to improving the municipal environment.
(5) Water reducing agent
The porous structure of the sound insulation material requires that the sound insulation material is manufactured by adopting a smaller water-cement ratio, and when the water consumption is less, the mixture is dry, hard and loose, the workability is poor, and the sound insulation material is not easy to form. After the water reducing agent is added, the water consumption of the mixture is reduced under the condition of ensuring the workability, so that the early strength and the final strength of the sound absorbing material are improved.
(6) Foaming agent
The blowing agent is a surface-active additive capable of forming a dense foam morphology by introducing air. Because the density is reduced when a large amount of air holes are formed in the concrete, and the surface of the concrete has activity, the tension of the surface of the liquid is reduced to a certain extent, the surface of the liquid film is surrounded by double layers of electrons, and the air is wrapped in the center and gathered together, namely, foams are formed. The addition of the foam can effectively reduce the cement addition amount, save materials and reduce waste, the uniform foam has better toughness, excellent stability and small foam breaking rate, and the use of the foaming agent can shorten the working time and save the cost.
(7) Foam stabilizer
The foam stabilizer can improve the stability of bubbles, prolongs the substances with half-life of foam breaking, can effectively prevent the combination and overflow of the bubbles, can also improve the pore structure, increases the uniformity of pores and is further favorable for improving the compressive strength of aerated concrete products.
(8) Early strength agent
The early strength agent is an additive which can improve the early strength of concrete and has no obvious influence on the later strength, has the main functions of accelerating the hydration speed of cement and promoting the development of the early strength of concrete, and has the functions of early strength and certain water reduction and enhancement.
The light building sound insulation material based on the fly ash is a novel cement-based composite material formed by mixing ceramsite as aggregate, cement, the fly ash as a cementing material, water, an additive and the like, wherein only a thin layer of cement paste is wrapped on the surface of ceramsite particles as a cementing layer, the aggregate particles are bonded with each other to form a large number of mutually-communicated pores inside, and the porous structures are fine and uniform and mutually communicated and extend to the external surface, so that the light building sound insulation material belongs to special porous structure concrete. Because the inside porous structure makes concrete sound insulation material have the characteristic of inhaling sound and making an uproar, because arouse the inside air vibration of hole in the sound energy transmission process, the air rubs with the solid muscle net emergence between the hole, because friction and viscous force effect, sound energy is constantly converted into heat energy and is consumed away to make the sound wave decay, the reflected sound weakens, thereby reaches the purpose of sound absorption. On the other hand, after the sound waves are reflected by the rigid wall surface, a part of the sound waves are transmitted to the air, a part of the sound waves are reflected back to the interior of the material, the sound waves are repeatedly transmitted, sound energy is continuously converted into heat energy to be consumed, new balance can be achieved after the sound energy is repeatedly transmitted, and finally the porous material absorbs enough sound energy to achieve the noise reduction effect.
Compared with the prior art, the invention has the beneficial effects that: the sound insulation material prepared by the method has good comprehensive performance through reasonable proportioning of the components, and by adding the sludge-based ceramsite and the fly ash, the recycling of urban solid waste and industrial waste residue is realized, the purposes of environmental protection and energy conservation are achieved, and the noise in the environment can be isolated.
Detailed Description
The sources of some of the raw materials used in the examples of the present invention are as follows, and the raw materials used in the examples can be obtained from conventional commercial sources or can be prepared by conventional methods, unless otherwise specified:
the cement is purchased from northeast Asia of Hubei, Inc., the model is P.O 42.5, the specific surface area is 360 square meters per kg, and the water consumption of the standard consistency is 0.26.
The fly ash is grade II fly ash, is purchased from Wuhan Yang logical power plants, and has a specific surface area of 449 square meters per kg.
The sludge-based ceramsite is purchased from Shenyang Zezhong environmental protection science and technology Limited company, and has the main performance indexes of 9 percent of water absorption, 19mm of nominal particle size and 390kg/m of bulk density3The barrel pressure was 2.3 (MPa).
The water reducing agent is purchased from Hubei Lingan science and technology Limited, and has the solid content of 35-45 percent and the water reducing rate of 40 percent.
Titanium dioxide, rutile type, particle size 30-50 nm, purchased from Guangzhou hundred million peaking Industrial & tech Co.
Comparative example 1
The preparation method of the light building sound insulation material based on the fly ash comprises the following steps:
(1) soaking 30g of sludge-based ceramsite in 60g of water for 1 hour, and draining the sludge-based ceramsite for later use;
(2) weighing 6g of titanium dioxide and 20g of water, uniformly stirring, and then placing the titanium dioxide and the water in an ultrasonic cell crusher to crush for 30 minutes to obtain an ultrasonically-crushed uniformly-dispersed titanium dioxide suspension;
(3) diluting 1g of sodium dodecyl sulfate with 50g of water, mixing with 1g of modified silicone polyether emulsion, and preparing the mixture by an air compression foaming machine to obtain the product with the density of 50kg/m3Uniform sized foam;
(4) weighing 270g of cement, 30g of fly ash, 30g of silica fume, sludge-based ceramsite presoaked by water in the step 1, 6g of polycarboxylic acid water reducing agent, the titanium dioxide suspension prepared in the step 2 and 60g of water, pouring the mixture into a mortar stirrer, uniformly stirring to obtain cement slurry, and controlling the temperature of the slurry to be 25 ℃;
(5) mixing 3gAl (SO)4)3·18H2Mixing O, 3g of triethanolamine and 30g of water, adding the mixture into the cement slurry obtained in the step (4), and stirring for 2 minutes to obtain uniform fluid cement slurry;
(6) adding the foam prepared in the step (3) into the cement paste obtained in the step (5), and stirring until the foam cement slurry is in a uniform and stable state to obtain foam concrete;
(7) and uniformly injecting the prepared foam concrete into a 100mm multiplied by 100mm mould, demoulding after 24h of forming, and placing the demoulded sample in a standard curing box with the temperature of 20 +/-2 ℃ and the relative humidity of more than 95% for curing for 28d to obtain the lightweight building sound insulation material based on the fly ash.
Example 1
The preparation method of the light building sound insulation material based on the fly ash comprises the following steps:
(1) soaking 30g of sludge-based ceramsite in 60g of water for 1 hour, and draining the sludge-based ceramsite for later use;
(2) diluting 1g of sodium dodecyl sulfate with 50g of water, mixing with 1g of modified silicone polyether emulsion, and preparing the mixture by an air compression foaming machine to obtain the product with the density of 50kg/m3Uniform sized foam;
(3) weighing 270g of cement, 30g of fly ash, 30g of silica fume, sludge-based ceramsite presoaked by water in the step 1, 6g of polycarboxylic acid water reducing agent and 60g of water, pouring the mixture into a mortar stirrer, uniformly stirring to obtain cement slurry, and controlling the temperature of the slurry to be 25 ℃;
(4) mixing 3gAl (SO)4)3·18H2Mixing O, 3g of triethanolamine and 30g of water, adding the mixture into the cement slurry, and stirring for 2 minutes to obtain uniform fluid cement slurry;
(5) adding the foam prepared in the step (2) into the slurry obtained in the step (4), and stirring until the foam cement slurry reaches a uniform and stable state to obtain foam concrete;
(6) and uniformly injecting the prepared foam concrete into a 100mm multiplied by 100mm mould, demoulding after 24h of forming, and placing the demoulded sample in a standard curing box with the temperature of 20 +/-2 ℃ and the relative humidity of more than 95% for curing for 28d to obtain the lightweight building sound insulation material based on the fly ash.
Example 2
The preparation method of the light building sound insulation material based on the fly ash comprises the following steps:
(1) soaking 30g of sludge-based ceramsite in 60g of water for 1 hour, and draining the sludge-based ceramsite for later use;
(2) weighing 6g of modified titanium dioxide and 20g of water, uniformly stirring, and then placing the mixture into an ultrasonic cell crusher to crush for 30 minutes to obtain an ultrasonically-crushed uniformly-dispersed modified titanium dioxide suspension;
(3) diluting 1g of sodium dodecyl sulfate with 50g of water, mixing with 1g of modified silicone polyether emulsion, and preparing the mixture by an air compression foaming machine to obtain the product with the density of 50kg/m3Uniform sized foam;
(4) weighing 270g of cement, 30g of fly ash, 30g of silica fume, sludge-based ceramsite presoaked by water in the step 1, 6g of polycarboxylic acid water reducing agent, the modified titanium dioxide suspension prepared in the step 2 and 60g of water, pouring the mixture into a mortar stirrer, uniformly stirring to obtain cement slurry, and controlling the temperature of the slurry to be 25 ℃;
(5) mixing 3gAl (SO)4)3·18H2Mixing O, 3g of triethanolamine and 30g of water, adding the mixture into the cement slurry obtained in the step (4), and stirring for 2 minutes to obtain uniform fluid cement slurry;
(6) adding the foam prepared in the step (3) into the cement paste obtained in the step (5), and stirring until the foam cement slurry is in a uniform and stable state to obtain foam concrete;
(7) and uniformly injecting the prepared foam concrete into a 100mm multiplied by 100mm mould, demoulding after 24h of forming, and placing the demoulded sample in a standard curing box with the temperature of 20 +/-2 ℃ and the relative humidity of more than 95% for curing for 28d to obtain the lightweight building sound insulation material based on the fly ash.
The preparation method of the modified titanium dioxide comprises the following steps: (1) preparing carbon powder: weighing 24.5g of glucose, and dissolving with 245mL of distilled water; transferring the solution into an autoclave lined with polytetrafluoroethylene, and heating at 180 ℃ for 4 h; centrifuging and collecting a product, and washing the product with distilled water and absolute ethyl alcohol in sequence; drying the obtained product in a vacuum drying oven at 80 ℃ for 4 hours to obtain carbon powder; (2) preparing modified titanium dioxide: adding 0.3g of carbon powder into a mixed solution of 2g of ferric nitrate hydrate, 48mL of absolute ethyl alcohol and 3mL of distilled water; adding 30mL of titanium butanol solution, heating to 80 ℃, and stirring for reaction for 4 hours; and centrifuging, collecting the precipitate, washing with absolute ethyl alcohol, and drying the product in a vacuum drying oven at 80 ℃ for 4 hours to obtain the modified titanium dioxide.
Example 3
The preparation method of the light building sound insulation material based on the fly ash comprises the following steps:
(1) soaking 30g of sludge-based ceramsite in 60g of water for 1 hour, and draining the sludge-based ceramsite for later use;
(2) weighing 6g of modified titanium dioxide and 20g of water, uniformly stirring, and then placing the mixture into an ultrasonic cell crusher to crush for 30 minutes to obtain an ultrasonically-crushed uniformly-dispersed modified titanium dioxide suspension; the preparation method of the modified titanium dioxide is the same as that of the embodiment 2;
(3) diluting 1g of sodium dodecyl sulfate with 50g of water, mixing with 1g of modified silicone polyether emulsion, and preparing the mixture by an air compression foaming machine to obtain the product with the density of 50kg/m3Uniform sized foam;
(4) weighing 300g of cement, 30g of silica fume, sludge-based ceramsite presoaked with water in the step 1, 6g of polycarboxylic acid water reducing agent, the modified titanium dioxide suspension prepared in the step 2 and 60g of water, pouring the mixture into a mortar stirrer, uniformly stirring to obtain cement slurry, and controlling the temperature of the slurry to be 25 ℃;
(5) mixing 3gAl (SO)4)3·18H2O, 3g Tri-ethanolMixing amine and 30g of water, adding the mixture into the cement slurry, and stirring for 2 minutes to obtain uniform fluid cement slurry;
(6) adding the foam prepared in the step (3) into the slurry obtained in the step (5), and stirring until the foam cement slurry reaches a uniform and stable state to obtain foam concrete;
(7) and uniformly injecting the prepared foam concrete into a 100mm multiplied by 100mm mould, demoulding after 24h of forming, and placing the demoulded sample in a standard curing box with the temperature of 20 +/-2 ℃ and the relative humidity of more than 95% for curing for 28d to obtain the lightweight building sound insulation material based on the fly ash.
Test example
The performance of the prepared foam concrete test block is tested according to the requirements of foam concrete industry standard (JG/T266-2011), 10 test pieces are arranged in each group, and the average value of the results is taken. The properties of the foamed concrete prepared in the above comparative examples and examples were tested:
(1) compressive strength;
(2) dry density;
(3) coefficient of thermal conductivity;
(4) water absorption;
compressive strength: the compressive strength test was carried out using a NYL-2000D type compression tester. The calculation formula of the compressive strength is as follows: f. ofcc＝P1/A
fcc-compressive strength of the test piece in megapascals (MPa);
P1-specimen breaking load in newtons (N);
A1test piece bearing area in square millimeters (mm)2)；
Dry density: the dry density was measured using a DHG9036A model electric hot air drying oven and a WT-1002 model electronic scale.
The dry density is calculated as: r0＝M0×106/V；
R0Dry density in kilograms per cubic meter (kg/m)3)；
M0Mass in grams (g) after complete drying of the test piece;
v-test piece volumeUnit cubic millimeter (mm)3)。
Water absorption: 3 test pieces are taken and put into an electric heating air blast drying oven, the temperature is kept for 24 hours at the temperature of 60 +/-5 ℃, then the temperature is kept for 24 hours at the temperature of 80 +/-5 ℃, and then the test pieces are dried to the constant weight M at the temperature of 105 +/-5 DEG C0(ii) a Cooling the test piece to room temperature, placing the test piece into a constant-temperature water tank with the water temperature of (20 +/-5) DEG C, adding water to 1/3 of the height of the test piece, keeping for 24h, adding water to 2/3 of the test piece, adding water which is 30mm higher than the test piece after 24h, and keeping for 24 h; taking out the test piece from the water, wiping off the surface moisture by a wet towel, and immediately weighing each block of mass MgTo the accuracy of 1g。
The water absorption calculation formula is as follows: wR＝(Mg-M0)×100％/M0
WR-water absorption,%;
M0-mass in grams (g) of the test piece after drying;
Mg-mass in grams (g) of the test piece after drying;
coefficient of thermal conductivity: a double-plate heat conductivity coefficient tester produced by the Limited liability company of the Intel (Tianjin) measurement and control equipment is adopted to test the heat conductivity coefficient, and before the test, a test block needs to be placed in a (40 +/-5) DEG C drying oven to be dried to constant weight.
The sound insulation effect test of the prepared foam concrete is carried out according to the industry standard GB/T19889.3-2005 of building and construction member sound insulation measurement, 3 test pieces are arranged in each group, and the results are averaged. The specific test results are shown in table 1.
TABLE 1
Figure BDA0003166383360000121
The lower the dry density, the lighter the mass of the foam concrete, the more pores per unit volume, and the better the sound insulation performance;
the higher the compressive strength is, the better the mechanical property of the foam concrete is;
the lower the thermal conductivity coefficient is, the better the heat insulation performance of the material is;
the higher the sound insulation quantity is, the better the sound insulation effect of the material is;
the higher the water absorption, the poorer the water repellency of the material.
As can be seen from the data in Table 1, the addition of the modified titanium dioxide and the fly ash improves the strength of the foamed concrete, probably because the modified titanium dioxide can promote the hydration of cement clinker and the secondary hydration of fly ash, reduce the porosity, increase the polymerization degree of C-S-H gel, and then improve the strength of the foamed concrete.
And (3) anti-carbonization test: the method is carried out according to GB/T50082-2009 Standard test method for long-term performance and durability of common concrete. The temperature of the carbonization chamber is (20 +/-2) DEG C, the relative humidity is (70 +/-5)%, and CO is2The concentration is (20 +/-3)%, the carbonation time is 28d, and the specific test results are shown in Table 2.
TABLE 2
Depth of carbonization
Comparative example 1 6.03
Example 1 7.53
Example 2 5.48
Example 3 5.62
The lower the carbonization depth, the better the carbonization resistance of the material.
As can be seen from the detection data in Table 2, the addition of the modified titanium dioxide can obviously improve the anti-carbonization capability of the foam concrete, probably because the iron doped in the titanium dioxide improves the catalytic capability of the titanium dioxide, the iron ions are added into the crystal lattice of the titanium dioxide, and the iron ions replace a part of titanium ions, so that the energy band structure of the titanium dioxide is adjusted, the photocatalytic performance of the titanium dioxide is changed, and the CO in the air can be effectively degraded2。
From the analysis and detection results, the lightweight building sound insulation material based on the fly ash prepared by the invention has good sound insulation effect, and other properties such as compressive strength, heat insulation, water resistance and carbonization resistance are also good.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims (8)

1. The preparation method of the light building sound insulation material based on the fly ash is characterized by comprising the following steps:
(1) soaking 20-40 g of ceramsite in water for 1-2 h, and draining the ceramsite for later use;
(2) weighing 1-12 g of modified titanium dioxide and 10-20 g of water, uniformly stirring, and then carrying out ultrasonic crushing to obtain a modified titanium dioxide suspension;
(3) diluting 0.5-1.5 g of foaming agent with 6-75 g of water, and mixing with 0.5-1.5 g of foam stabilizer to prepare uniform foam;
(4) weighing 200-300 g of cement, 1-30 g of fly ash, 1-30 g of silica fume, sludge-based ceramsite presoaked with water in the step (1), 5-10 g of water reducing agent, the modified titanium dioxide suspension obtained in the step (2) and 50-70 g of water, and uniformly stirring to obtain cement slurry;
(5) mixing 2-3 g of coagulant, 2-3 g of early strength agent and 20-40 g of water, adding the mixture into the cement slurry obtained in the step (4), and stirring for 2-3 minutes to obtain uniform fluid cement slurry;
(6) adding the foam prepared in the step (3) into the cement paste obtained in the step (5), and stirring until the foam cement slurry is in a uniform and stable state to obtain foam concrete;
(7) uniformly injecting the prepared foam concrete into a mold, demolding after molding for 12-24 h, and placing the demolded sample into a standard curing box for curing to obtain a lightweight building sound insulation material based on fly ash;
the preparation method of the modified titanium dioxide comprises the following steps:
(1) preparing carbon powder: weighing 20-25 g of glucose, and dissolving with 200-300 mL of distilled water; transferring the solution into an autoclave lined with polytetrafluoroethylene, and heating for 3-4 h at 160-200 ℃; centrifuging and collecting a product, and washing the product with distilled water and absolute ethyl alcohol in sequence; drying the obtained product in a vacuum drying oven at 70-80 ℃ for 2-4 hours to obtain carbon powder;
(2) preparing modified titanium dioxide: adding 0.2-0.4 g of carbon powder into a mixed solution of 1-2 g of ferric nitrate hydrate, 45-50 mL of absolute ethyl alcohol and 1-3 mL of distilled water; adding 20-40 mL of titanium butanol solution, heating to 60-80 ℃, stirring and reacting for 2-4 hours; and centrifuging, collecting the precipitate, washing with absolute ethyl alcohol, and drying the product in a vacuum drying oven at the temperature of 60-80 ℃ for 2-4 hours to obtain the modified titanium dioxide.
2. The method for preparing a lightweight building insulation material based on fly ash as claimed in claim 1, wherein: the ceramsite in the step (1) is sludge-based ceramsite, and the particle size of the ceramsite is 20-30 meshes.
3. The method for preparing a lightweight building insulation material based on fly ash as claimed in claim 1, wherein: the foaming agent in the step (3) is a surfactant; at least one selected from sulfate surfactants, sulfonate surfactants and fatty alcohol-polyoxyethylene ether; the mass ratio of the foaming agent to the water is 1: 40-50.
4. The method for preparing a lightweight building insulation material based on fly ash as claimed in claim 1, wherein: the cement in the step (4) is any one or the mixture of two or more of ordinary portland cement, slag portland cement, pozzolanic portland cement and composite portland cement.
5. The method for preparing a lightweight building insulation material based on fly ash as claimed in claim 1, wherein: the fly ash in the step (4) is grade II fly ash.
6. The method for preparing a lightweight building insulation material based on fly ash as claimed in claim 1, wherein: the water reducing agent in the step (4) is any one or a mixture of two or more of lignin sulfonate water reducing agent, naphthalene water reducing agent, melamine water reducing agent, sulfamate water reducing agent, fatty acid water reducing agent and polycarboxylic acid water reducing agent.
7. The method for preparing a lightweight building insulation material based on fly ash as claimed in claim 1, wherein: and (5) the mold in the step (7) is one of a plate mold, a brick mold and a door mold.
8. A light building sound insulation material based on fly ash is characterized in that: the light building sound insulation material is prepared by the method for preparing the light building sound insulation material based on the fly ash according to any one of claims 1 to 7.
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EP2935145A1 (en) * 2012-12-20 2015-10-28 Qim Projekt & Consult GmbH Building material composition for producing a lightweight concrete
CN108395274A (en) * 2018-05-02 2018-08-14 宁波普利凯建筑科技有限公司 A kind of light high-strength haydite foam concrete and preparation method thereof
CN109081653A (en) * 2018-09-19 2018-12-25 东南大学 A kind of high-strength light cracking resistance concrete base building thermal insulation material and preparation method thereof
CN111875302A (en) * 2020-07-26 2020-11-03 南京林业大学 Light high-strength lightweight aggregate concrete and pouring method thereof

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