CN109626932B - Autoclaved aerated concrete plate and preparation method thereof - Google Patents
Autoclaved aerated concrete plate and preparation method thereof Download PDFInfo
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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
- C04B28/14—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 calcium sulfate cements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/26—Corrosion of reinforcement resistance
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/76—Use at unusual temperatures, e.g. sub-zero
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses an autoclaved aerated concrete plate and a preparation method thereof, wherein the preparation method of the autoclaved aerated concrete plate comprises the following steps: batching, derusting the steel bar, pouring and statically maintaining, and performing autoclaved maintenance; wherein the steel bar derusting means that the steel bar net is immersed in the antirust liquid for 1-2min, and then is placed at the temperature of 70-80 ℃ for baking for 40-60 min; the antirust liquid is prepared by the following method: mixing acrylic emulsion, polyvinyl butyral, cement, lime, asphalt, propylene glycol monobutyl ether, hydroxypropyl methyl cellulose, ethylene glycol methacrylate, a dispersing agent, a defoaming agent and water, and uniformly stirring to obtain the antirust liquid. After the reinforcing mesh is treated by the antirust liquid, the antirust layer formed on the surface of the reinforcing mesh can play a role in rust prevention and corrosion resistance on the reinforcing mesh, can increase the adhesive force of the reinforcing mesh, prevents the reinforcing mesh from being separated from a concrete plate, and prolongs the service life of the reinforced concrete plate.
Description
Technical Field
The invention relates to the technical field of aerated concrete, in particular to an autoclaved aerated concrete plate and a preparation method thereof.
Background
The autoclaved aerated concrete material comprises autoclaved aerated concrete blocks and autoclaved aerated concrete plates, wherein the autoclaved aerated concrete plates (ALC plates and AAC plates for short) are a porous structure concrete product which is prepared by using siliceous materials, cement and lime as main raw materials, reinforcing the siliceous materials by anti-rust steel bars and performing high-temperature and high-pressure steam curing. The sound insulation and absorption performance is good, and the fireproof and fireproof heat preservation performance is good; the weight of the wall is 1/4 of common concrete, the dead weight of the wall can be reduced, the cost of the foundation is reduced, and the main products comprise an outer wall, an inner cavity, a floor plate, a deck plate, a lintel and the like.
In the prior art, patent application No. CN201611241244.4 discloses an aerated concrete slab and a manufacturing method thereof, and the aerated concrete slab comprises 53-89 parts of fly ash, 30-90 parts of sand, 10-26 parts of quicklime, 0.5-1.7 parts of desulfurized gypsum, 0.05-0.15 part of aluminum powder, 0.5-2 parts of an additive and 5-14 parts of cement by mass.
The autoclaved aerated concrete plate and the autoclaved aerated concrete block are different from each other in the greatest way that a reinforcing mesh constructed by a plurality of reinforcing steel bars is arranged in the autoclaved aerated concrete plate, and the reinforcing mesh also enables the compressive strength of the concrete plate to be higher than that of a common concrete block, so that the autoclaved aerated concrete block can be used in an environment with a higher requirement on the degree of resistance to pressure.
In order to prevent the reinforcing mesh from rusting in the using process to damage the inside of the autoclaved aerated concrete plate, a rust inhibitor needs to be coated on the surface of the reinforcing mesh in a dip mode; the most commonly used antirust agents at present are latex lime sand coatings and latex cement sand coatings of coatings, the antirust coatings are mainly flexible materials, although antirust layers formed by the antirust coatings can endow steel bars with good antirust performance, the antirust coatings are easy to cause the separation of the steel bars and a concrete interface, and therefore the reinforcing effect of the steel bars on the concrete is weakened or loses efficacy; when the epoxy resin with higher hardness is used as the antirust agent, the bonding force between the steel bar and the concrete can be reduced, and the separation of the steel bar and the concrete interface is easily caused, so that the strength of the concrete plate is reduced; therefore, how to improve the bonding strength between the aerated concrete and the steel bars in the autoclaved aerated concrete plate is a problem to be solved. Disclosure of Invention
One of the purposes of the invention is to provide a preparation method of an autoclaved aerated concrete plate, wherein after the reinforcing mesh is treated by the antirust liquid, an antirust layer formed on the surface of the reinforcing mesh can play a role in rust prevention and corrosion resistance on the reinforcing mesh, can also increase the adhesive force of the reinforcing mesh, prevent the reinforcing mesh from being separated from the concrete plate, and prolong the service life of the reinforced concrete plate.
The technical purpose of the invention is realized by the following technical scheme: a preparation method of an autoclaved aerated concrete plate comprises the following steps:
(1) preparing materials: grinding 65-75 parts of tailing sand, adding 60-70 parts of water, and stirring to obtain slurry;
(2) derusting the steel bars: soaking the reinforcing mesh in antirust liquid for 1-2min, and baking at 70-80 deg.C for 40-60 min;
(3) pouring and resting: uniformly stirring the slurry, 10-20 parts of cement, 10-15 parts of lime, 1-3 parts of gypsum and 0.4-0.6 part of aluminum powder, pouring the mixture into a mold, and inserting a reinforcing mesh; then placing the plate blank at the temperature of 40-60 ℃ for standing for 2-3h to obtain a plate blank;
(4) steam pressure curing: cutting and grouping the plate blank after demoulding, and then placing the plate blank in a steam curing environment at the temperature of 190-; the antirust liquid is prepared by the following method: by weight, 20-30 parts of acrylic emulsion, 10-15 parts of polyvinyl butyral, 8-12 parts of cement, 8-12 parts of lime, 4-6 parts of asphalt, 6-10 parts of propylene glycol butyl ether, 2-4 parts of hydroxypropyl methyl cellulose, 0.3-0.5 part of ethylene glycol methacrylate, 0.3-0.5 part of dispersing agent, 0.3-0.5 part of defoaming agent and 30-40 parts of water are mixed and stirred at the temperature of 70-80 ℃ for 20-30min at the speed of 800r/min with 600 organic materials, and then the antirust liquid can be obtained.
By adopting the technical scheme, after the reinforcing mesh is treated by the antirust liquid, the surface of the reinforcing mesh can form an antirust layer, so that the antirust layer can play a role in rust prevention and corrosion resistance on the reinforcing mesh, and the antirust layer formed by the antirust layer has good adhesion with a concrete plate through the actions of polyvinyl butyral, ethylene glycol methacrylate and propylene glycol monobutyl ether in the antirust liquid, so that the adhesion of the reinforcing mesh can be increased, the reinforcing mesh is prevented from being separated from the concrete plate, and the service life of the reinforced concrete plate is prolonged.
Further, the dispersing agent is sodium hexametaphosphate.
By adopting the technical scheme, sodium hexametaphosphate is used as a dispersing agent of the antirust liquid, so that the dispersion degree of polyvinyl butyral and ethylene glycol methacrylate in the acrylic emulsion can be improved, and raw materials can be fully reacted.
Further, the defoamer is a polyether defoamer.
By adopting the technical scheme, the polyether defoaming agent belongs to a nonionic surfactant, can play a good defoaming and foam inhibiting role on the antirust liquid, has good stability and no toxicity, and belongs to an environment-friendly raw material.
Further, grinding the tailing sand in the step (1), sieving the tailing sand by a 0.08mm square-hole sieve until the balance is less than 20%, and then adding water and stirring.
By adopting the technical scheme, the tailing sand is ground and then passes through a 0.08mm square-hole sieve, so that the sieve residue is less than 20%, the obtained tailing sand is moderate in fineness and uniform in particle size, and the prepared autoclaved aerated concrete plate is uniform in foam and stable in quality.
Further, the stirring speed in the step (1) is 800-.
By adopting the technical scheme, the tailing sand and the water are uniformly stirred at the speed of 800-.
Further, the stirring speed in step (3) is 2000-3000 r/min.
By adopting the technical scheme, the raw materials are stirred at a high speed of 2000-3000r/min, and the raw materials can be fully mixed by the high-speed shearing force, so that the strength and the hardness of the plate can be improved.
The invention also aims to provide an autoclaved aerated concrete plate.
The technical purpose of the invention is realized by the following technical scheme: the autoclaved aerated concrete plate comprises the following components in parts by weight: 65-75 parts of tailing sand, 10-20 parts of cement, 10-15 parts of lime, 1-3 parts of gypsum, 0.4-0.6 part of aluminum powder and 60-70 parts of water.
By adopting the technical scheme, the autoclaved aerated concrete plate is rich in raw material source and low in price, can fully utilize industrial waste tailings sand, realizes resource recycling, can reduce production cost, and has good economic benefit.
Further, the tailings are gold tailings with the silicon dioxide content of more than 80%.
By adopting the technical scheme, the gold tailing sand belongs to industrial solid waste, the silicon dioxide content of the gold tailing sand is more than 80%, the hydration product generated by the reaction has good stability, the strength index is high after autoclaved curing, the drying shrinkage value is small, and the stability of the performance of the aerated concrete block can be maintained.
Furthermore, the lime is quicklime with the content of active calcium oxide being more than 80%, and the screen allowance of a 0.08mm square-hole screen is 4-8%.
By adopting the technical scheme, the main component of the quicklime is calcium oxide, and when the calcium oxide reacts with water, a large amount of heat can be released to promote the generation of hydrated gel, so that the control of the production process is facilitated, and the product quality is ensured; and the fineness of the quicklime is improved, the volume expansion in the quicklime digestion process can be reduced, the cracking of a blank body is reduced, the screen allowance of a 0.08mm square-hole screen is preferably 4-8%, and when the fineness of the quicklime is too small, the digestion speed can be improved, and the pouring stability is influenced.
Further, the gypsum is desulfurized gypsum.
By adopting the technical scheme, the main components of the desulfurized gypsum are the same as the gypsum and are calcium sulfate dihydrate, compared with other gypsum, the desulfurized gypsum powder has the characteristics of reproducibility, small granularity, stable components, low content of harmful impurities, high purity and the like, belongs to an environment-friendly material, and has the advantages of improving the strength of the board and reducing the shrinkage.
In summary, compared with the prior art, the invention has the following beneficial effects:
1. after the reinforcing mesh is treated by the antirust liquid, an antirust layer can be formed on the surface of the reinforcing mesh, so that the reinforcing mesh can be rusted and corroded, and the antirust layer formed by the antirust layer has good adhesion with a concrete plate under the action of polyvinyl butyral, ethylene glycol methacrylate and propylene glycol monobutyl ether in the antirust liquid, so that the adhesion of the reinforcing mesh can be increased, the reinforcing mesh is prevented from being separated from the concrete plate, and the service life of the reinforced concrete plate is prolonged;
2. the autoclaved aerated concrete plate has the advantages of rich raw material sources and low price, can fully utilize industrial waste tailings sand, realizes the reutilization of resources, can also reduce the production cost, and has good economic benefit.
Detailed Description
The present invention will be described in further detail below.
The acrylic emulsion in the following examples is selected from E0504 aqueous acrylic emulsion produced by Shenzhen Jitian chemical Limited; the hydroxypropyl methylcellulose is selected from hydroxypropyl methylcellulose with a trade name of 60RT4000 produced by Shandong Ruita; the polyether defoamer is selected from F-115 polyether defoamers produced by Guangdong Tianfeng defoamer Co.
First, preparation example of antirust liquid
Preparation example 1: 20kg of acrylic emulsion, 10kg of polyvinyl butyral, 8kg of P.O.42.5 ordinary portland cement, 8kg of lime, 4kg of asphalt, 6kg of propylene glycol butyl ether, 2kg of hydroxypropyl methyl cellulose, 0.3kg of ethylene glycol methacrylate, 0.3kg of sodium hexametaphosphate, 0.3kg of polyether defoamer and 30kg of water are mixed and stirred at the speed of 600r/min at the temperature of 70 ℃ for 20min to obtain the antirust liquid.
Preparation example 2: 25kg of acrylic emulsion, 12.5kg of polyvinyl butyral, 10kg of P.O.42.5 ordinary portland cement, 10kg of lime, 5kg of asphalt, 8kg of propylene glycol butyl ether, 3kg of hydroxypropyl methyl cellulose, 0.4kg of ethylene glycol methacrylate, 0.4kg of sodium hexametaphosphate, 0.4kg of polyether defoamer and 35kg of water are mixed and stirred at the speed of 700r/min for 25min at the temperature of 75 ℃ to obtain the antirust liquid.
Preparation example 3: 30kg of acrylic emulsion, 15kg of polyvinyl butyral, 12kg of P.O.42.5 ordinary portland cement, 12kg of lime, 6kg of asphalt, 10kg of propylene glycol butyl ether, 4kg of hydroxypropyl methyl cellulose, 0.5kg of ethylene glycol methacrylate, 0.5kg of sodium hexametaphosphate, 0.5kg of polyether defoamer and 40kg of water are mixed and stirred at the temperature of 80 ℃ at the speed of 800r/min for 30min to obtain the antirust liquid.
Preparation example 4: this production example is different from production example 1 in that the raw materials do not contain polyvinyl butyral, ethylene glycol methacrylate, and propylene glycol butyl ether.
Preparation example 5: this production example is different from production example 1 in that the raw materials do not contain propylene glycol butyl ether, sodium hexametaphosphate, and a polyether defoaming agent.
Second, example
Example 1: the autoclaved aerated concrete plate is prepared by adopting the following method:
(1) preparing materials: grinding 65kg of gold tailing sand with silicon dioxide content of more than 80% until the screen residue of a 0.08mm square-hole screen is less than 20%, adding 60kg of water, and uniformly stirring at the speed of 800r/min to obtain slurry;
(2) derusting the steel bars: soaking the reinforcing mesh in antirust liquid for 1min, and then placing at 70 ℃ for baking for 40 min; the rust-preventive liquid is selected from the rust-preventive liquid prepared in preparation example 1;
(3) pouring and resting: uniformly stirring the slurry, 10kg of cement, 10kg of lime, 1kg of gypsum and 0.4kg of aluminum powder at the speed of 2000r/min, pouring the mixture into a mold, and inserting a reinforcing mesh; then placing the plate blank at the temperature of 40 ℃ for standing for 2 hours to obtain a plate blank; wherein the cement is slag portland cement with the strength grade of 42.5, the lime is quicklime with the content of active calcium oxide being more than 80 percent, the balance of a 0.08mm square-hole sieve is 6 percent, and the aluminum powder is aluminum powder with the aluminum content being more than 90 percent;
(4) steam pressure curing: and (3) demolding the plate blank, cutting and marshalling, and then placing the plate blank under the conditions that the temperature is 190 ℃ and the pressure is 0.9MPa, and performing steam curing for 20 hours to obtain the autoclaved aerated concrete plate.
Example 2: the autoclaved aerated concrete plate is prepared by adopting the following method:
(1) preparing materials: grinding 70kg of gold tailing sand with silicon dioxide content of more than 80% until the screen residue of a 0.08mm square-hole screen is less than 20%, adding 65kg of water, and uniformly stirring at the speed of 900r/min to obtain slurry;
(2) derusting the steel bars: soaking the reinforcing mesh in antirust liquid for 1.5min, and then placing at 75 ℃ for 50 min; the rust-preventive liquid is selected from the rust-preventive liquid prepared in preparation example 2;
(3) pouring and resting: uniformly stirring the slurry, 15kg of cement, 12.5kg of lime, 2kg of gypsum and 0.5kg of aluminum powder at the speed of 2500r/min, pouring the mixture into a mold, and inserting a reinforcing mesh; then placing the plate blank at the temperature of 50 ℃ for static maintenance for 2.5 hours to obtain a plate blank; wherein the cement is slag portland cement with the strength grade of 42.5, the lime is quicklime with the content of active calcium oxide being more than 80 percent, the balance of a 0.08mm square-hole sieve is 6 percent, and the aluminum powder is aluminum powder with the aluminum content being more than 90 percent;
(4) steam pressure curing: and (3) demolding the plate blank, cutting and marshalling, and then placing the plate blank under the conditions that the temperature is 195 ℃ and the pressure is 1.1MPa, and performing steam curing for 22 hours to obtain the autoclaved aerated concrete plate.
Example 3: the autoclaved aerated concrete plate is prepared by adopting the following method:
(1) preparing materials: grinding 75kg of gold tailings sand with silicon dioxide content of more than 80% until the screen residue of a 0.08mm square-hole screen is less than 20%, adding 70kg of water, and uniformly stirring at the speed of 1000r/min to obtain slurry;
(2) derusting the steel bars: soaking the reinforcing mesh in antirust liquid for 2min, and then placing the reinforcing mesh at the temperature of 80 ℃ for baking for 60 min; the rust preventive liquid was selected from the rust preventive liquid prepared in preparation example 3;
(3) pouring and resting: uniformly stirring the slurry, 20kg of cement, 15kg of lime, 3kg of gypsum and 0.6kg of aluminum powder at the speed of 3000r/min, pouring the mixture into a mold, and inserting a reinforcing mesh; then placing the plate blank at the temperature of 60 ℃ for standing for 3 hours to obtain a plate blank; wherein the cement is slag portland cement with the strength grade of 42.5, the lime is quicklime with the content of active calcium oxide being more than 80 percent, the balance of a 0.08mm square-hole sieve is 6 percent, and the aluminum powder is aluminum powder with the aluminum content being more than 90 percent;
(4) steam pressure curing: and (3) demolding the plate blank, cutting and marshalling, and then placing the plate blank under the conditions that the temperature is 200 ℃ and the pressure is 1.3MPa, and performing steam curing for 24 hours to obtain the autoclaved aerated concrete plate.
Third, comparative example
Comparative example 1: the comparative example is different from example 1 in that the rust inhibitive liquid prepared in preparation example 4 was used.
Comparative example 2: this comparative example is different from example 1 in that the rust inhibitive liquid prepared in preparation example 5 was used.
Comparative example 3: the difference between the comparative example and the example 1 is that the antirust liquid is prepared from the antirust liquid prepared in the example 1 with the application number of 201610126460.8, and the micro-nano steel bar antirust agent for the autoclaved aerated concrete slab and the preparation method thereof, and the micro-nano steel bar antirust agent for the autoclaved aerated concrete slab is prepared from the following raw materials in percentage by mass: organosilicon modified acrylic emulsion: 15 percent; silica sol emulsion: 20 percent; lime: 12 percent; silica fume: 10 percent; cement: 8 percent; light calcium silicate: 12 percent; film-forming auxiliary agent: 3 percent; tackifier: 0.2 percent; defoaming agent: 0.2 percent; dispersing agent: 0.2 percent; water: 19.4 percent; the solid content of the organosilicon modified acrylic emulsion is 30 percent (Guangzhou dolomitic constant and fine chemical plant LR-308A); silica sol emulsion with SiO2 content of 20%; the specific surface area of the silica fume is 20m2/g, and the silica fume is obtained by the reduction reaction of high-purity quartz and coke in a high-temperature electric arc furnace when the silica fume is preferably silicon or silicon-containing alloy for smelting industry, and the commercial products such as the products produced by Norwegian Erken group and the like; the lime is hydrated lime powder; the cement is PO42.5 portland cement; the fineness of the light calcium silicate is 1000 meshes; the film-forming additive is alcohol ester twelve; the viscosity increaser is hydroxypropyl methyl cellulose ether with the viscosity of 15 ten thousand; the defoaming agent is an organic silicon emulsion defoaming agent; the dispersant is sodium hexametaphosphate.
The preparation method of the micro-nano steel bar antirust agent for the autoclaved aerated concrete slab comprises the following steps: (1) adding the silica fume, the lime, the cement and the light calcium silicate into a stirrer according to the mass ratio, adding a proper amount of water, stirring, and sealing while stirring for 15 minutes; (2) sequentially adding the organic silicon modified acrylic emulsion and the silica sol emulsion into the stirrer according to the mass ratio, and continuously stirring for 5 minutes; (3) mixing and stirring the film forming auxiliary agent, the tackifier, the defoaming agent and the dispersing agent with a proper amount of water in another smaller stirrer according to a mass ratio, adding the mixture into a main stirrer after uniformly stirring, and continuously stirring for 3 minutes to obtain the micro-nano steel bar antirust agent for the autoclaved aerated concrete slab.
And fourthly, testing the performances of the autoclaved aerated concrete plates prepared in the examples 1-3 and the comparative examples 1-3 according to GB15762-2008 'autoclaved aerated concrete slab' and JC/T855-1999 'test method for antirust performance of steel bar coatings of autoclaved aerated concrete slabs', and the test results are shown in Table 1.
TABLE 1
The data show that the autoclaved aerated concrete plate prepared by the invention has excellent compressive strength, frost resistance and lower heat conductivity coefficient, and the autoclaved aerated concrete plate prepared by the invention has good strength, frost resistance and heat preservation performance, wherein the strength grade is A5.0, and the dry density grade is B06; in addition, the rust-proof layer formed on the surface of the reinforcing mesh treated by the method can play a role in rust prevention and corrosion resistance on the reinforcing mesh, can also increase the adhesive force of the reinforcing mesh, prevent the reinforcing mesh from being separated from the concrete plate, and prolong the service life of the reinforced concrete plate.
The antirust liquid in the comparative example 1 is the antirust liquid prepared in the preparation example 4, and the raw materials do not contain polyvinyl butyral, ethylene glycol methacrylate and propylene glycol butyl ether, so that the compressive strength of the autoclaved aerated concrete plate is reduced compared with that of the example 1, and the compressive strength of the autoclaved aerated concrete plate can be improved by the reinforcing mesh treated by the antirust liquid; in addition, the rust prevention capability and the adhesion of the steel bar in the comparative example 1 are obviously reduced, which shows that the adhesion between the rust prevention layer and the concrete plate can be obviously improved and the rust prevention capability of the steel bar mesh can be improved through the polyvinyl butyral, the ethylene glycol methacrylate and the propylene glycol monobutyl ether in the rust prevention liquid.
The antirust liquid in the comparative example 2 adopts the antirust liquid prepared in the preparation example 5, and the raw materials do not contain propylene glycol butyl ether, sodium hexametaphosphate and a polyether defoaming agent, so that compared with the antirust liquid prepared in the example 1, the antirust capacity and the steel bar adhesive force of the steel bar in the comparative example 1 are obviously reduced, and the antirust liquid is difficult to be uniformly mixed, which shows that the propylene glycol butyl ether, the sodium hexametaphosphate and the polyether defoaming agent in the antirust liquid are beneficial to the dispersion of other raw materials of the antirust liquid, so that the raw materials are more easily and uniformly mixed, the performance of the prepared antirust liquid is more stable, and the anticorrosion effect is improved.
Compared with the example 1 of the invention, the antirust liquid in the comparative example 3 adopts the application number of 201610126460.8, the micro-nano steel bar antirust agent for the autoclaved aerated concrete slab and the preparation method thereof, and compared with the example 1 of the invention, the autoclaved aerated concrete slab in the comparative example 3 has the advantages that the compressive strength, frost resistance, steel bar antirust capacity and steel bar adhesive force are obviously lower than those of the autoclaved aerated concrete slab, so that the autoclaved aerated concrete slab has more excellent comprehensive performance.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (9)
1. The preparation method of the autoclaved aerated concrete plate is characterized by comprising the following steps of: the method comprises the following steps:
(1) preparing materials: grinding 65-75 parts of tailing sand, adding 60-70 parts of water, and stirring to obtain slurry, wherein the tailing sand is gold tailing sand with the silicon dioxide content of more than 80%;
(2) derusting the steel bars: soaking the reinforcing mesh in antirust liquid for 1-2min, and baking at 70-80 deg.C for 40-60 min;
(3) pouring and resting: uniformly stirring the slurry, 10-20 parts of cement, 10-15 parts of lime, 1-3 parts of gypsum and 0.4-0.6 part of aluminum powder, pouring the mixture into a mold, and inserting a reinforcing mesh; then placing the plate blank at the temperature of 40-60 ℃ for standing for 2-3h to obtain a plate blank;
(4) steam pressure curing: cutting and grouping the plate blank after demoulding, and then placing the plate blank in a steam curing environment at the temperature of 190-;
the antirust liquid is prepared by the following method: by weight, 20-30 parts of acrylic emulsion, 10-15 parts of polyvinyl butyral, 8-12 parts of cement, 8-12 parts of lime, 4-6 parts of asphalt, 6-10 parts of propylene glycol butyl ether, 2-4 parts of hydroxypropyl methyl cellulose, 0.3-0.5 part of ethylene glycol methacrylate, 0.3-0.5 part of dispersing agent, 0.3-0.5 part of defoaming agent and 30-40 parts of water are mixed and stirred at the temperature of 70-80 ℃ for 20-30min at the speed of 800r/min with 600 organic materials, and then the antirust liquid can be obtained.
2. The preparation method of the autoclaved aerated concrete plate according to claim 1, which is characterized by comprising the following steps: the dispersant is sodium hexametaphosphate.
3. The preparation method of the autoclaved aerated concrete plate according to claim 1, which is characterized by comprising the following steps: the defoaming agent is a polyether defoaming agent.
4. The preparation method of the autoclaved aerated concrete plate according to claim 1, which is characterized by comprising the following steps: grinding the tailing sand in the step (1), sieving the tailing sand by a 0.08mm square-hole sieve until the balance is less than 20%, and then adding water and stirring.
5. The preparation method of the autoclaved aerated concrete plate according to claim 1, which is characterized by comprising the following steps: the stirring speed in the step (1) is 800-.
6. The preparation method of the autoclaved aerated concrete plate according to claim 1, which is characterized by comprising the following steps: the stirring speed in the step (3) is 2000-3000 r/min.
7. An autoclaved aerated concrete slab prepared by the preparation method of the autoclaved aerated concrete slab as claimed in any one of claims 1 to 6, wherein: the paint comprises the following components in parts by weight: 65-75 parts of tailing sand, 10-20 parts of cement, 10-15 parts of lime, 1-3 parts of gypsum, 0.4-0.6 part of aluminum powder and 60-70 parts of water.
8. The autoclaved aerated concrete slab as claimed in claim 7, wherein: the lime is quicklime with active calcium oxide content more than 80%, and the screen allowance of a 0.08mm square-hole screen is 4-8%.
9. The autoclaved aerated concrete slab as claimed in claim 7, wherein: the gypsum is desulfurized gypsum.
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| CN111018469A (en) * | 2019-12-27 | 2020-04-17 | 广州发展环保建材有限公司 | Autoclaved aerated concrete slab and preparation method thereof |
| CN112724791A (en) * | 2021-01-22 | 2021-04-30 | 太原钢铁(集团)有限公司 | Anticorrosive paint for steel bar mesh cage arranged in aerated plate and preparation method thereof |
| CN113715160A (en) * | 2021-07-13 | 2021-11-30 | 太原钢铁(集团)有限公司 | Production process of high-strength aerated concrete slab |
| CN115231942B (en) * | 2022-07-21 | 2023-11-28 | 东莞市盛丰建材有限公司 | Aerated concrete plate and production process thereof |
| CN116813371B (en) * | 2022-08-09 | 2024-11-05 | 嘉华特种水泥股份有限公司 | Aerated concrete plate maintained by using cement kiln tail flue gas and preparation method |
| CN115466092B (en) * | 2022-09-24 | 2023-07-07 | 四川滨水上锦绿色建材有限公司 | Preparation method of autoclaved aerated concrete plate and prepared plate |
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