Preparation method of anti-seismic and anti-cracking aerated block

Abstract

The invention relates to the technical field of concrete, and discloses a preparation method of an anti-seismic and anti-cracking aerated block, which comprises the following raw materials: sand, building waste, fly ash, cement, lime, a montmorillonite grafted product, gypsum powder, aluminum powder, a water reducing agent and a stabilizer. The montmorillonite grafted product is prepared by modifying montmorillonite with hexadecyl trimethyl ammonium bromide, grafting alkyd resin with acrylamide and then grafting the modified montmorillonite with the grafted alkyd resin. The surface property of montmorillonite is changed, the binding force is greatly enhanced, and the mechanical properties such as tensile strength and bending strength are effectively improved. The polypropylene fiber is used as a coating process, so that the surface binding force of the material can be better improved, and the anti-seismic and anti-cracking effects are improved. The aerated block prepared by the invention has good anti-seismic and anti-cracking performance, the problem of abandoned building materials can be effectively solved by using building wastes, and the process is safe and environment-friendly and is suitable for industrial popularization.

Description

Technical Field

[0001] The invention relates to the technical field of concrete, in particular to a method for preparing an earthquake-resistant and crack-resistant aerated block. Background Art

[0002] Aerated blocks are a lightweight building material with good thermal insulation performance and are widely used in the construction industry. However, when facing natural disasters such as earthquakes, existing aerated blocks have insufficient seismic resistance and are prone to cracks or even breakage, causing damage to the building structure and threatening the safety of life and property. Therefore, it is of great significance to develop an aerated block with excellent seismic and crack resistance and a preparation method thereof. Summary of the invention

[0003] 1. Technical issues to be resolved

[0004] In view of the deficiencies in the prior art, the present invention provides a method for preparing an earthquake-resistant and crack-resistant aerated block.

[0005] (II) Technical solution

[0006] To achieve the above object, the present invention provides the following technical solution: an anti-seismic and anti-crack aerated block, comprising the following weight component raw materials:

[0007] 30-60 parts of sand, 30-50 parts of construction waste, 20-40 parts of fly ash, 20-30 parts of cement, 10-15 parts of lime, 10-15 parts of montmorillonite grafted product, 5-10 parts of gypsum powder, 0.5-1 parts of aluminum powder, 0.5-1 parts of water reducer, and 0.1-0.3 parts of stabilizer.

[0008] Preferably, the water reducer is a polycarboxylate water reducer.

[0009] Preferably, the stabilizer is one of HPMC, PAM, EVA and silica fume.

[0010] Preferably, the method comprises the following steps:

[0011] S1. Add sodium montmorillonite to deionized water, stir at 1000-1500r / min for 1-2h to prepare a montmorillonite dispersion; add hexadecyltrimethylammonium bromide to deionized water, stir and dissolve in a water bath at 50-60°C to prepare a hexadecyltrimethylammonium bromide solution; stir and heat the montmorillonite dispersion to 70-80°C, add the hexadecyltrimethylammonium bromide solution, stir and react for 2-5h, and after the reaction is completed, centrifuge at a speed of 3000-4000r / min for 10-15min to obtain a precipitate, wash and dry to obtain a modified montmorillonite;

[0012] S2, linseed oil, trimethylolpropane, and catalyst dibutyltin dilaurate are mixed, heated in an oil bath to 200-220°C, stirred and reacted for 30-60min, cooled to 160-180°C, diethylene glycol and isophthalic acid are added, heated to 220-230°C and continued to react until a large amount of water is generated, cooled to 160-180°C, benzoic acid and 1,2,4-benzene trimellitic anhydride are added, reacted for 1-3h, cooled to 80-90°C, acrylamide and initiator ammonium persulfate are added, reacted for 1-3h, cooled to room temperature, and acrylamide grafted alkyd resin is obtained;

[0013] S3, adding the modified montmorillonite to deionized water, ultrasonically dispersing for 30-60 minutes to form a uniform suspension, adding acrylamide grafted alkyd resin, stirring evenly, adding initiator potassium persulfate, passing nitrogen, stirring and reacting at 60-80° C. for 4-6 hours to obtain a montmorillonite grafted product;

[0014] S4, grinding the polypropylene fiber into powder and soaking it in a sodium hydroxide solution with a mass fraction of 1-3% for 1-2 hours, and washing it with deionized water until it is neutral; adding Span and Tween into deionized water, heating it to 50-60°C, stirring to dissolve, adding the treated polypropylene fiber, stirring at 1000-1500r / min for 30-60min, adding sodium carboxymethyl cellulose and polydimethylsiloxane, and continuing to stir for 10-20min to obtain a polypropylene fiber emulsion;

[0015] S5, crushing the construction waste, passing it through a 150-250 mesh sieve, mixing it with sand and stirring it evenly, spraying the polypropylene fiber emulsion evenly on the surface of the mixture of the construction waste and sand by using an electrospray device, stirring it continuously during the spraying to ensure uniform coating, and drying it at the same time to obtain a mixture of construction waste and sand with the surface coated with polypropylene fibers;

[0016] S6. Add the treated construction waste and sand mixture into water and stir evenly, add fly ash, cement, lime, montmorillonite grafted product, gypsum powder, aluminum powder, water reducer and stabilizer, stir evenly and pour into a mold, let stand at 40-60°C for 2-5h, then transfer to a steam kettle, and cure at a temperature of 50-70°C and a pressure of 0.5-1MPa for 15-30h to obtain earthquake-resistant and crack-proof aerated blocks.

[0017] Preferably, in step S1, the mass ratio of sodium montmorillonite to hexadecyltrimethylammonium bromide is 1:0.2-0.6.

[0018] Preferably, in step S2, the mass ratio of linseed oil, trimethylolpropane, catalyst dibutyltin dilaurate, diethylene glycol, isophthalic acid, benzoic acid, 1,2,4-trimellitic anhydride, acrylamide, and initiator ammonium persulfate is 1:0.6-0.8:0.02-0.05:0.1-0.2:0.6-0.8:0.01-0.03:0.3-0.6:0.8-1.2:0.05-0.12.

[0019] Preferably, in step S3, the mass ratio of modified montmorillonite, acrylamide grafted alkyd resin, and potassium persulfate is 1:0.4-0.6:0.05-0.1.

[0020] Preferably, in step S4, the mass ratio of polypropylene fiber, span, tween, sodium carboxymethyl cellulose and polydimethylsiloxane is 1:0.3-0.6:0.1-0.3:0.02-0.05:0.01-0.04.

[0021] (III) Beneficial technical effects

[0022] An anti-seismic and anti-cracking aerated block comprises the following raw materials by weight: 30-60 parts of sand, 30-50 parts of construction waste, 20-40 parts of fly ash, 20-30 parts of cement, 10-15 parts of lime, 10-15 parts of montmorillonite grafted product, 5-10 parts of gypsum powder, 0.5-1 part of aluminum powder, 0.5-1 part of water reducer and 0.1-0.3 part of stabilizer.

[0023] The montmorillonite grafted product is made by modifying montmorillonite with hexadecyltrimethylammonium bromide, grafting acrylamide with alkyd resin, and then grafting it onto the modified montmorillonite. Changing the surface properties of montmorillonite greatly enhances the bonding force and effectively improves mechanical properties such as tensile strength and bending strength. The coating process with polypropylene fiber can better improve the surface bonding force of the material and enhance the anti-seismic and anti-cracking effect.

[0024] The aerated block prepared by the invention has good anti-seismic and anti-cracking performance, and the use of construction waste can effectively solve the problem of abandoned construction materials. The process is safe and environmentally friendly, and is suitable for industrial promotion. DETAILED DESCRIPTION

[0025] Example 1

[0026] S1. Add 20 kg of sodium montmorillonite to 100 L of deionized water, stir at 1000 r / min for 1 h to prepare a montmorillonite dispersion; add 4 kg of hexadecyltrimethylammonium bromide to 30 L of deionized water, stir and dissolve in a 50°C water bath to prepare a hexadecyltrimethylammonium bromide solution; stir and heat the montmorillonite dispersion to 70°C, add the hexadecyltrimethylammonium bromide solution, stir and react for 2 h, and after the reaction is completed, centrifuge at 3000 r / min for 10 min to obtain a precipitate, wash and dry to obtain a modified montmorillonite.

[0027] S2. Mix 10kg of linseed oil, 6kg of trimethylolpropane and 0.2kg of catalyst dibutyltin dilaurate, heat to 200°C in an oil bath, stir and react for 30min, cool to 160°C, add 1kg of diethylene glycol and 6kg of isophthalic acid, heat to 220°C and continue to react until a large amount of water is produced, cool to 160°C, add 0.1kg of benzoic acid and 3kg of 1,2,4-trimethylol anhydride, react for 1h, cool to 80°C, add 8kg of acrylamide and 0.5kg of initiator ammonium persulfate, react for 1h, cool to room temperature, and obtain acrylamide grafted alkyd resin.

[0028] S3. Add 18 kg of modified montmorillonite into 80 L of deionized water, perform ultrasonic dispersion for 30 min to form a uniform suspension, add 7.2 kg of acrylamide grafted alkyd resin, stir evenly, add 0.9 kg of initiator potassium persulfate, pass nitrogen, stir and react at 60 ° C for 4 h to obtain a montmorillonite grafted product.

[0029] S4. Grind 50kg of polypropylene fiber into powder and soak it in 150L of 1% sodium hydroxide solution for 1h, and wash it with deionized water until it is neutral; add 15kg of Span and 5kg of Tween into deionized water, heat to 50°C, stir to dissolve, add the treated polypropylene fiber, stir at 1000r / min for 30min, add 1kg of sodium carboxymethyl cellulose and 0.5kg of polydimethylsiloxane, and continue stirring for 10min to obtain a polypropylene fiber emulsion.

[0030] S5. Crush the construction waste, pass it through a 150-mesh sieve, mix it with sand and stir it evenly, use an electrospray device to evenly spray the polypropylene fiber emulsion on the surface of the mixture of construction waste and sand, stir it continuously during spraying to ensure uniform coating, and dry it at the same time to obtain a mixture of construction waste and sand with the surface coated with polypropylene fibers.

[0031] S6. Add 30kg of the treated construction waste and 30kg of sand mixture into 50L of water and stir evenly. Add 20kg of fly ash, 20kg of cement, 10kg of lime, 10kg of montmorillonite grafted product, 5kg of gypsum powder, 0.5kg of aluminum powder, 0.5kg of polycarboxylic acid water reducer, and 0.1kg of stabilizer HPMC. Pour into a mold after stirring evenly. Let it stand at 40°C for 2h, then transfer it to a steam kettle and cure it at a temperature of 50°C and a pressure of 0.5MPa for 15h to obtain an earthquake-resistant and crack-proof aerated block.

[0032] Example 2

[0033] S1. Add 20 kg of sodium montmorillonite to 200 L of deionized water, stir at 1500 r / min for 2 h to prepare a montmorillonite dispersion; add 12 kg of hexadecyltrimethylammonium bromide to 80 L of deionized water, stir and dissolve in a 60°C water bath to prepare a hexadecyltrimethylammonium bromide solution; stir and heat the montmorillonite dispersion to 80°C, add the hexadecyltrimethylammonium bromide solution, stir and react for 5 h, and after the reaction is completed, centrifuge at 4000 r / min for 15 min to obtain a precipitate, wash and dry to obtain a modified montmorillonite.

[0034] S2. Mix 10kg of linseed oil, 8kg of trimethylolpropane and 0.5kg of catalyst dibutyltin dilaurate, heat to 220°C in an oil bath, stir and react for 60min, cool to 180°C, add 2kg of diethylene glycol and 8kg of isophthalic acid, heat to 230°C and continue to react until a large amount of water is produced, cool to 180°C, add 0.3kg of benzoic acid and 6kg of 1,2,4-trimethylol anhydride, react for 3h, cool to 90°C, add 12kg of acrylamide and 1.2kg of initiator ammonium persulfate, react for 3h, cool to room temperature, and obtain acrylamide grafted alkyd resin.

[0035] S3. Add 18 kg of modified montmorillonite into 160 L of deionized water, perform ultrasonic dispersion for 60 min to form a uniform suspension, add 10.8 kg of acrylamide grafted alkyd resin, stir evenly, add 1.5 kg of initiator potassium persulfate, pass nitrogen, stir and react at 80 ° C for 6 h to obtain a montmorillonite grafted product.

[0036] S4. Grind 50kg of polypropylene fiber into powder and soak it in 200L of 3% sodium hydroxide solution for 2h, and wash it with deionized water until it is neutral; add 30kg of Span and 15kg of Tween into deionized water, heat to 60°C, stir to dissolve, add the treated polypropylene fiber, stir at 1500r / min for 60min, add 2.5kg of sodium carboxymethyl cellulose and 2kg of polydimethylsiloxane, and continue stirring for 20min to obtain a polypropylene fiber emulsion.

[0037] S5. Crush the construction waste, pass it through a 250-mesh sieve, mix it with sand and stir it evenly, use an electrospray device to evenly spray the polypropylene fiber emulsion on the surface of the mixture of construction waste and sand, stir it continuously during spraying to ensure uniform coating, and dry it at the same time to obtain a mixture of construction waste and sand with the surface coated with polypropylene fibers.

[0038] S6. Add 50kg of the treated construction waste and 60kg of sand mixture into 100L of water and stir evenly, add 40kg of fly ash, 30kg of cement, 15kg of lime, 15kg of montmorillonite grafted product, 10kg of gypsum powder, 1kg of aluminum powder, 1kg of polycarboxylic acid water reducer, and 0.3kg of stabilizer PAM, stir evenly and pour into a mold, let stand at 60°C for 5h, then transfer to a steam kettle, and cure at a temperature of 70°C and a pressure of 1MPa for 30h to obtain an earthquake-resistant and crack-proof aerated block.

[0039] Example 3

[0040] S1. Add 20 kg of sodium montmorillonite into 120 L of deionized water, stir at 1200 r / min for 1.5 h to prepare a montmorillonite dispersion; add 5 kg of hexadecyltrimethylammonium bromide into 40 L of deionized water, stir and dissolve in a water bath at 55°C to prepare a hexadecyltrimethylammonium bromide solution; stir and heat the montmorillonite dispersion to 80°C, add the hexadecyltrimethylammonium bromide solution, stir and react for 3 h, and after the reaction is completed, centrifuge at 3500 r / min for 15 min to obtain a precipitate, wash and dry to obtain a modified montmorillonite.

[0041] S2. Mix 10kg of linseed oil, 6.5kg of trimethylolpropane and 0.3kg of catalyst dibutyltin dilaurate, heat to 220°C in an oil bath, stir and react for 50min, cool to 170°C, add 1.2kg of diethylene glycol and 6.5kg of isophthalic acid, heat to 230°C and continue to react until a large amount of water is produced, cool to 170°C, add 0.2kg of benzoic acid and 3.4kg of 1,2,4-trimethylol anhydride, react for 2h, cool to 90°C, add 8kg of acrylamide and 0.6kg of initiator ammonium persulfate, react for 1.5h, cool to room temperature, and obtain acrylamide grafted alkyd resin.

[0042] S3. Add 18 kg of modified montmorillonite into 100 L of deionized water, and disperse by ultrasonic for 40 min to form a uniform suspension. Add 8 kg of acrylamide grafted alkyd resin and stir evenly. Add 1 kg of initiator potassium persulfate, pass nitrogen, and stir and react at 70 ° C for 5 h to obtain a montmorillonite grafted product.

[0043] S4. Grind 50kg of polypropylene fiber into powder and soak it in 180L of 2% sodium hydroxide solution for 1.5h, and wash it with deionized water until it is neutral; add 20kg of Span and 6kg of Tween into deionized water, heat to 50°C, stir to dissolve, add the treated polypropylene fiber, stir at 1200r / min for 40min, add 1.5kg of sodium carboxymethyl cellulose and 0.8kg of polydimethylsiloxane, and continue stirring for 20min to obtain a polypropylene fiber emulsion.

[0044] S5. Crush the construction waste, pass it through a 200-mesh sieve, mix it with sand and stir it evenly, use an electrospray device to evenly spray the polypropylene fiber emulsion on the surface of the mixture of construction waste and sand, stir it continuously during spraying to ensure uniform coating, and dry it at the same time to obtain a mixture of construction waste and sand with the surface coated with polypropylene fibers.

[0045] S6. Add 35kg of the treated construction waste and 40kg of sand mixture into 60L of water and stir evenly. Add 25kg of fly ash, 22kg of cement, 12kg of lime, 15kg of montmorillonite grafted product, 6kg of gypsum powder, 0.6kg of aluminum powder, 0.8kg of polycarboxylic acid water reducer, and 0.2kg of stabilizer EVA. Pour into a mold after stirring evenly. Let it stand at 50°C for 3h, then transfer it to a steam kettle and cure it at a temperature of 60°C and a pressure of 0.6MPa for 25h to obtain an earthquake-resistant and crack-proof aerated block.

[0046] Example 4

[0047] S1. Add 20 kg of sodium montmorillonite into 180 L of deionized water, stir at 1500 r / min for 2 h to prepare a montmorillonite dispersion; add 8 kg of hexadecyltrimethylammonium bromide into 60 L of deionized water, stir and dissolve in a 60°C water bath to prepare a hexadecyltrimethylammonium bromide solution; stir and heat the montmorillonite dispersion to 70°C, add the hexadecyltrimethylammonium bromide solution, stir and react for 4 h, and after the reaction is completed, centrifuge at 4000 r / min for 10 min to obtain a precipitate, wash and dry to obtain a modified montmorillonite.

[0048] S2. Mix 10kg of linseed oil, 7kg of trimethylolpropane and 0.4kg of catalyst dibutyltin dilaurate, heat to 200°C in an oil bath, stir and react for 50min, cool to 180°C, add 1.6kg of diethylene glycol and 7.3kg of isophthalic acid, heat to 230°C and continue to react until a large amount of water is produced, cool to 160°C, add 0.3kg of benzoic acid and 5.2kg of 1,2,4-trimethylol anhydride, react for 3h, cool to 90°C, add 9kg of acrylamide and 1kg of initiator ammonium persulfate, react for 1h, cool to room temperature, and obtain acrylamide grafted alkyd resin.

[0049] S3. Add 18 kg of modified montmorillonite into 150 L of deionized water, perform ultrasonic dispersion for 60 min to form a uniform suspension, add 9 kg of acrylamide grafted alkyd resin, stir evenly, add 1.2 kg of initiator potassium persulfate, pass nitrogen, stir and react at 80 ° C for 5 h to obtain a montmorillonite grafted product.

[0050] S4. Grind 50kg of polypropylene fiber into powder and soak it in 180L of 1% sodium hydroxide solution for 2h, and wash it with deionized water until it is neutral; add 20kg of Span and 10kg of Tween into deionized water, heat to 50°C, stir to dissolve, add the treated polypropylene fiber, stir at 1000r / min for 60min, add 2kg of sodium carboxymethyl cellulose and 1kg of polydimethylsiloxane, and continue stirring for 20min to obtain a polypropylene fiber emulsion.

[0051] S5. Crush the construction waste, pass it through a 250-mesh sieve, mix it with sand and stir it evenly, use an electrospray device to evenly spray the polypropylene fiber emulsion on the surface of the mixture of construction waste and sand, stir it continuously during spraying to ensure uniform coating, and dry it at the same time to obtain a mixture of construction waste and sand with the surface coated with polypropylene fibers.

[0052] S6. Add 40kg of the treated construction waste and 50kg of sand mixture into 90L of water and stir evenly. Add 30kg of fly ash, 26kg of cement, 15kg of lime, 10kg of montmorillonite grafted product, 8kg of gypsum powder, 0.8kg of aluminum powder, 0.9kg of polycarboxylic acid water reducer, and 0.3kg of stabilizer silica fume. Pour into a mold after stirring evenly. Let it stand at 60°C for 2h, then transfer it to a steam kettle and cure it at a temperature of 70°C and a pressure of 1MPa for 15h to obtain earthquake-resistant and crack-proof aerated blocks.

[0053] Example 5

[0054] S1. Add 20 kg of sodium montmorillonite into 160 L of deionized water, stir at 1000 r / min for 2 h to prepare a montmorillonite dispersion; add 10 kg of hexadecyltrimethylammonium bromide into 80 L of deionized water, stir and dissolve in a 50°C water bath to prepare a hexadecyltrimethylammonium bromide solution; stir and heat the montmorillonite dispersion to 80°C, add the hexadecyltrimethylammonium bromide solution, stir and react for 5 h, and after the reaction is completed, centrifuge at 4000 r / min for 15 min to obtain a precipitate, wash and dry to obtain a modified montmorillonite.

[0055] S2. Mix 10kg of linseed oil, 7kg of trimethylolpropane and 0.5kg of catalyst dibutyltin dilaurate, heat to 200°C in an oil bath, stir and react for 60min, cool to 160°C, add 2kg of diethylene glycol and 7kg of isophthalic acid, heat to 220°C and continue to react until a large amount of water is produced, cool to 170°C, add 0.1kg of benzoic acid and 6kg of 1,2,4-trimethylol anhydride, react for 2h, cool to 90°C, add 11kg of acrylamide and 0.9kg of initiator ammonium persulfate, react for 1h, cool to room temperature, and obtain acrylamide grafted alkyd resin.

[0056] S3. Add 18 kg of modified montmorillonite into 150 L of deionized water, perform ultrasonic dispersion for 50 min to form a uniform suspension, add 10 kg of acrylamide grafted alkyd resin, stir evenly, add 1.2 kg of initiator potassium persulfate, pass nitrogen, stir and react at 80 ° C for 5 h to obtain a montmorillonite grafted product.

[0057] S4. Grind 50kg of polypropylene fiber into powder and soak it in 200L of 3% sodium hydroxide solution for 1h, and wash it with deionized water until it is neutral; add 30kg of Span and 10kg of Tween into deionized water, heat to 60°C, stir to dissolve, add the treated polypropylene fiber, stir at 1500r / min for 60min, add 2.2kg of sodium carboxymethyl cellulose and 1.8kg of polydimethylsiloxane, and continue stirring for 20min to obtain a polypropylene fiber emulsion.

[0058] S5. Crush the construction waste, pass it through a 200-mesh sieve, mix it with sand and stir it evenly, use an electrospray device to evenly spray the polypropylene fiber emulsion on the surface of the mixture of construction waste and sand, stir it continuously during spraying to ensure uniform coating, and dry it at the same time to obtain a mixture of construction waste and sand with the surface coated with polypropylene fibers.

[0059] S6. Add 45kg of the treated construction waste and 50kg of sand mixture into 100L of water and stir evenly, add 30kg of fly ash, 30kg of cement, 10kg of lime, 10kg of montmorillonite grafted product, 9kg of gypsum powder, 0.5kg of aluminum powder, 0.8kg of polycarboxylic acid water reducer, and 0.1kg of stabilizer HPMC, stir evenly and pour into a mold, let stand at 60°C for 4h, then transfer to a steam kettle, and cure at a temperature of 70°C and a pressure of 0.5MPa for 15h to obtain an earthquake-resistant and crack-proof aerated block.

[0060] Comparative Example 1

[0061] 30kg of construction waste was crushed, passed through a 150-mesh sieve, mixed with 30kg of sand and stirred evenly, added into 50L of water and stirred evenly, 20kg of fly ash, 20kg of cement, 10kg of lime, 5kg of gypsum powder, 0.5kg of aluminum powder, 0.5kg of polycarboxylic acid water reducer, and 0.1kg of stabilizer HPMC were added, stirred evenly and poured into a mold, allowed to stand at 40°C for 2h, then transferred to a steam kettle, and cured at a temperature of 50°C and a pressure of 0.5MPa for 15h to obtain an earthquake-resistant and crack-proof aerated block.

[0062] Comparative Example 2

[0063] S1. Grind 50kg of polypropylene fiber into powder and soak it in 150L of 1% sodium hydroxide solution for 1h, then wash it with deionized water until it becomes neutral; add 15kg of Span and 5kg of Tween into deionized water, heat to 50°C, stir to dissolve, add the treated polypropylene fiber, stir at 1000r / min for 30min, add 1kg of sodium carboxymethyl cellulose and 0.5kg of polydimethylsiloxane, continue stirring for 10min, and obtain a polypropylene fiber emulsion.

[0064] S2. Crush the construction waste, pass it through a 150-mesh sieve, mix it with sand and stir it evenly, use an electrospray device to evenly spray the polypropylene fiber emulsion on the surface of the mixture of construction waste and sand, stir it continuously during spraying to ensure uniform coating, and dry it at the same time to obtain a mixture of construction waste and sand with polypropylene fibers coated on the surface.

[0065] S3. Add 30kg of the treated construction waste and 30kg of sand mixture into 50L of water and stir evenly. Add 20kg of fly ash, 20kg of cement, 10kg of lime, 5kg of gypsum powder, 0.5kg of aluminum powder, 0.5kg of polycarboxylic acid water reducer, and 0.1kg of stabilizer HPMC. Pour into a mold after stirring evenly. Let it stand at 40°C for 2h, then transfer it into a steam kettle and cure it at a temperature of 50°C and a pressure of 0.5MPa for 15h to obtain an earthquake-resistant and crack-proof aerated block.

[0066] Comparative Example 3

[0067] S1. Add 20 kg of sodium montmorillonite to 100 L of deionized water, stir at 1000 r / min for 1 h to prepare a montmorillonite dispersion; add 4 kg of hexadecyltrimethylammonium bromide to 30 L of deionized water, stir and dissolve in a 50°C water bath to prepare a hexadecyltrimethylammonium bromide solution; stir and heat the montmorillonite dispersion to 70°C, add the hexadecyltrimethylammonium bromide solution, stir and react for 2 h, and after the reaction is completed, centrifuge at 3000 r / min for 10 min to obtain a precipitate, wash and dry to obtain a modified montmorillonite.

[0068] S2. Mix 10kg of linseed oil, 6kg of trimethylolpropane and 0.2kg of catalyst dibutyltin dilaurate, heat to 200°C in an oil bath, stir and react for 30min, cool to 160°C, add 1kg of diethylene glycol and 6kg of isophthalic acid, heat to 220°C and continue to react until a large amount of water is produced, cool to 160°C, add 0.1kg of benzoic acid and 3kg of 1,2,4-trimethylol anhydride, react for 1h, cool to 80°C, add 8kg of acrylamide and 0.5kg of initiator ammonium persulfate, react for 1h, cool to room temperature, and obtain acrylamide grafted alkyd resin.

[0069] S3. Add 18 kg of modified montmorillonite into 80 L of deionized water, perform ultrasonic dispersion for 30 min to form a uniform suspension, add 7.2 kg of acrylamide grafted alkyd resin, stir evenly, add 0.9 kg of initiator potassium persulfate, pass nitrogen, stir and react at 60 ° C for 4 h to obtain a montmorillonite grafted product.

[0070] S4. Crush 30kg of construction waste, pass it through a 150-mesh sieve, mix it with 30kg of sand and stir it evenly, add it into 50L of water and stir it evenly, add 20kg of fly ash, 20kg of cement, 10kg of lime, 10kg of montmorillonite grafted product, 5kg of gypsum powder, 0.5kg of aluminum powder, 0.5kg of polycarboxylic acid water reducer, and 0.1kg of stabilizer HPMC, stir evenly and pour it into a mold, let it stand at 40°C for 2h, then transfer it to a steam kettle, and cure it at a temperature of 50°C and a pressure of 0.5MPa for 15h to obtain an earthquake-resistant and crack-proof aerated block.

[0071] Performance Testing:

[0072] (1) Compressive strength: The compressive strength of the block at 28 days is tested in accordance with the standard GB / T 11971-1997 "Test methods for mechanical properties of aerated concrete", in MPa;

[0073] (2) Split tensile strength: The test was conducted in accordance with the method of GB / T 11971-1997 “Test methods for mechanical properties of aerated concrete” to test the split tensile strength of the block at 28 days, in MPa;

[0074] (3) Drying shrinkage value: Tested in accordance with the method of GB / T 11972-1997 "Test method for drying shrinkage of aerated concrete", unit: mm / m.

[0075] Table 1

[0076]

[0077]

[0078] It can be seen from Table 1 that the aerated blocks prepared in Examples 1-5 have better compressive and tensile strengths than those in Comparative Examples 1-3, have smaller shrinkage values, and are less prone to cracking. The surface montmorillonite grafted product and polypropylene coating process can effectively improve the material's anti-seismic and anti-cracking properties.

[0079] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A seismic and crack-proof aerated block, characterized in that: The raw materials include the following weight components: 30-60 parts of sand, 30-50 parts of construction waste, 20-40 parts of fly ash, 20-30 parts of cement, 10-15 parts of lime, 10-15 parts of montmorillonite grafted product, 5-10 parts of gypsum powder, 0.5-1 parts of aluminum powder, 0.5-1 parts of water reducer, and 0.1-0.3 parts of stabilizer.

2. The anti-seismic and anti-cracking aerated block according to claim 1, characterized in that: The water reducer is a polycarboxylate water reducer.

3. The anti-seismic and anti-cracking aerated block according to claim 1, characterized in that: The stabilizer is one of HPMC, PAM, EVA and silica fume.

4. A method for preparing an earthquake-resistant and crack-resistant aerated block, characterized in that: The following steps are involved: S1. Add sodium montmorillonite to deionized water, stir at 1000-1500r / min for 1-2h to prepare a montmorillonite dispersion; add hexadecyltrimethylammonium bromide to deionized water, stir and dissolve in a water bath at 50-60°C to prepare a hexadecyltrimethylammonium bromide solution; stir and heat the montmorillonite dispersion to 70-80°C, add the hexadecyltrimethylammonium bromide solution, stir and react for 2-5h, and after the reaction is completed, centrifuge at a speed of 3000-4000r / min for 10-15min to obtain a precipitate, wash and dry to obtain a modified montmorillonite; S2, linseed oil, trimethylolpropane, and catalyst dibutyltin dilaurate are mixed, heated in an oil bath to 200-220°C, stirred and reacted for 30-60min, cooled to 160-180°C, diethylene glycol and isophthalic acid are added, heated to 220-230°C and continued to react until a large amount of water is generated, cooled to 160-180°C, benzoic acid and 1,2,4-benzene trimellitic anhydride are added, reacted for 1-3h, cooled to 80-90°C, acrylamide and initiator ammonium persulfate are added, reacted for 1-3h, cooled to room temperature, and acrylamide grafted alkyd resin is obtained; S3, adding the modified montmorillonite to deionized water, ultrasonically dispersing for 30-60 minutes to form a uniform suspension, adding acrylamide grafted alkyd resin, stirring evenly, adding initiator potassium persulfate, passing nitrogen, stirring and reacting at 60-80° C. for 4-6 hours to obtain a montmorillonite grafted product; S4, grinding the polypropylene fiber into powder and soaking it in a sodium hydroxide solution with a mass fraction of 1-3% for 1-2 hours, and washing it with deionized water until it is neutral; adding Span and Tween into deionized water, heating it to 50-60°C, stirring to dissolve, adding the treated polypropylene fiber, stirring at 1000-1500r / min for 30-60min, adding sodium carboxymethyl cellulose and polydimethylsiloxane, and continuing to stir for 10-20min to obtain a polypropylene fiber emulsion; S5, crushing the construction waste, passing it through a 150-250 mesh sieve, mixing it with sand and stirring it evenly, spraying the polypropylene fiber emulsion evenly on the surface of the mixture of the construction waste and sand by using an electrospray device, stirring it continuously during the spraying to ensure uniform coating, and drying it at the same time to obtain a mixture of construction waste and sand with the surface coated with polypropylene fibers; S6. Add the treated construction waste and sand mixture into water and stir evenly, add fly ash, cement, lime, montmorillonite grafted product, gypsum powder, aluminum powder, water reducer and stabilizer, stir evenly and pour into a mold, let stand at 40-60°C for 2-5h, then transfer to a steam kettle, and cure at a temperature of 50-70°C and a pressure of 0.5-1MPa for 15-30h to obtain earthquake-resistant and crack-proof aerated blocks.

5. The method for preparing a seismic and crack resistant aerated block according to claim 4, characterized in that: In the step S1, the mass ratio of sodium montmorillonite to hexadecyltrimethylammonium bromide is 1:0.2-0.

6.

6. The method for preparing a seismic and crack resistant aerated block according to claim 4, characterized in that: In step S2, the mass ratio of linseed oil, trimethylolpropane, catalyst dibutyltin dilaurate, diethylene glycol, isophthalic acid, benzoic acid, 1,2,4-trimellitic anhydride, acrylamide, and initiator ammonium persulfate is 1:0.6-0.8:0.02-0.05:0.1-0.2:0.6-0.8:0.01-0.03:0.3-0.6:0.8-1.2:0.05-0.

12.

7. The method for preparing a seismic and crack resistant aerated block according to claim 4, characterized in that: In the step S3, the mass ratio of modified montmorillonite, acrylamide grafted alkyd resin and potassium persulfate is 1:0.4-0.6:0.05-0.

1.

8. The method for preparing a seismic and crack resistant aerated block according to claim 4, characterized in that: In the step S4, the mass ratio of polypropylene fiber, span, tween, sodium carboxymethyl cellulose and polydimethylsiloxane is 1:0.3-0.6:0.1-0.3:0.02-0.05:0.01-0.04.

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