Special interface mortar for autoclaved aerated concrete and preparation process thereof

Abstract

The application belongs to the technical field of building materials, and specifically provides a special interface mortar for autoclaved aerated concrete and a preparation process thereof.The special interface mortar for autoclaved aerated concrete comprises the following components: dry mixture and liquid material;the dry mixture comprises Portland cement, diatomite, feldspar tailings powder, heavy calcium, sand, hydroxypropyl methyl cellulose ether, redispersible latex powder, polyvinyl alcohol and alkali activator;and the liquid material comprises graphene oxide, water and water reducing agent.The special interface mortar for autoclaved aerated concrete prepared by the application has the characteristics of good water retention, strong impermeability, high cohesive tensile strength, and water resistance, heat resistance and freeze-thaw resistance, and meets the JC / T890-2017 standard.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of building materials, and particularly relates to a special interface mortar for autoclaved aerated concrete and a preparation process thereof. BACKGROUND

[0002] Autoclaved aerated concrete is a new type of wall material with energy saving and waste utilization, which is vigorously promoted and applied in China in recent years. Autoclaved aerated concrete has the advantages of light weight, heat insulation, sound absorption, sawing and nailing, and simple construction. However, in practical application, autoclaved aerated concrete has the characteristics of porous lightweight, loose surface, fast and uneven water absorption, which leads to problems such as hollowing, cracking, and peeling when directly plastering or pasting a decorative material.

[0003] Interface mortar is mainly composed of ordinary Portland cement gel material, sand as aggregate, and redispersible polymer emulsion powder as polymer binder, and cellulose ether, sodium-based bentonite, sepiolite, and air entraining agent as external agents. Interface mortar is mainly used for the pretreatment of the surface of concrete blocks / panels to improve the bonding performance of the base layer and the subsequent plastering layer and the decorative layer. Interface mortar is a key material to ensure the quality of concrete wall engineering.

[0004] However, the existing special interface mortar for autoclaved aerated concrete still has the following problems: (1) insufficient bonding strength: interface mortar is difficult to fully penetrate and form a firm bond, and the shrinkage performance of the mortar and the block does not match, which leads to problems such as hollowing, cracking, and even peeling off in the later period; (2) poor water retention performance: autoclaved aerated concrete blocks have a fast initial water absorption rate, and ordinary interface mortar has insufficient water retention capacity, which can cause the water in the mortar to be quickly absorbed by the base layer, resulting in insufficient cement hydration and reduced mortar strength, affecting its bonding performance and durability; (3) poor construction performance: in order to improve water retention, interface mortar sometimes excessively adds additives such as cellulose ether, resulting in high viscosity of the mortar, making it difficult to apply during construction, and prone to vertical flow phenomenon, affecting construction efficiency and quality; (4) insufficient durability: long-term exposure to external environment, interface mortar is affected by factors such as temperature and humidity changes, freeze-thaw cycles, and is prone to aging, powdering, and other phenomena, reducing its service life and failing to guarantee good bonding effect for a long time. SUMMARY

[0005] In view of the above problems, in order to further improve the adaptability of interface mortar and autoclaved aerated concrete, the application provides a special interface mortar for autoclaved aerated concrete and a preparation process thereof.

[0006] The application provides a special interface mortar for autoclaved aerated concrete, which comprises the following components by weight: dry mixture and liquid material; the dry mixture comprises 20-28 parts of Portland cement, 10-15 parts of diatomite, 5-8 parts of feldspar tailings powder, 10-15 parts of heavy calcium, 50-65 parts of sand, 0.2-0.3 parts of hydroxypropyl methyl cellulose ether, 1-3 parts of redispersible latex powder, 0.1-0.2 parts of polyvinyl alcohol and 6-8 parts of alkali activator; the liquid material comprises 0.025-0.036 parts of graphene oxide, 20-30 parts of water and 0.1-0.2 parts of water reducing agent.

[0007] Further, the alkali activator comprises lime, anhydrous aluminum sulfate, desulfurized gypsum and sucrose, and the mass ratio of the lime, the anhydrous aluminum sulfate, the desulfurized gypsum and the sucrose is (40-48):(1.4-1.6):(1.8-2.3):(0.11-0.23).

[0008] Further, the diatomite is treated by calcination at 800-900 DEG C and powder grinding and activation processes.

[0009] Further, the water reducing agent is prepared by the following method: S1, mixing monomer isoprenyl polyoxyethylene ether, monomer 3-acryloyloxypropyl triethoxysilane and initiator, and heating to 60-70 DEG C; S2, adding ethanol solution containing monomer caffeic acid and mercaptoethanol aqueous solution dropwise under stirring, and continuing to react for 3-5 h; S3, after the reaction is completed, adding deionized water to adjust the solid content of the product system to 30-40%, and then cooling to room temperature, and then purifying by dialysis to obtain the water reducing agent.

[0010] Further, the molar amount ratio of the isoprenyl polyoxyethylene ether, the 3-acryloyloxypropyl triethoxysilane and the caffeic acid is (1.25-1.50):(0.58-0.62):(1-1.23).

[0011] Further, the initiator is 1.8-2.2% of the total mass of monomers, and the mercaptoethanol is 0.5-1.5% of the total mass of monomers.

[0012] Further, the concentration of the ethanol solution containing monomer caffeic acid is 0.8-1.2 g / L, and the concentration of the mercaptoethanol aqueous solution is 0.5-0.8 g / L.

[0013] Further, the Portland cement is ordinary Portland cement 42.5.

[0014] Further, the redispersible latex powder is vinyl acetate-ethylene-vinyl versatate copolymer latex powder.

[0015] The application also provides a preparation process of the special interface mortar for autoclaved aerated concrete, which comprises the following steps: (1) under weak acid conditions, graphene oxide is added into water, ultrasonic treatment is performed for 5-10 min, then a water reducing agent is added, stirring is performed at 55-65 DEG C for 1-1.5 h, and liquid material is obtained; (2) silicate cement, diatomite, feldspar tailing powder, heavy calcium and sand are uniformly mixed, then an alkali activator, hydroxypropyl methyl cellulose ether, redispersible latex powder and polyvinyl alcohol are added, and uniform mixing is performed, and dry mixture is obtained; and (3) the liquid material is slowly added into the dry mixture, stirring is performed until the slurry is uniform, and the special interface mortar for autoclaved aerated concrete is obtained.

[0016] Compared with the prior art, the application has the following beneficial effects:

[0017] 1. In the application, diatomite and feldspar tailing powder are used to replace part of cement, and an alkali activator composed of lime, anhydrous aluminum sulfate, desulfurized gypsum and sucrose in a specific proportion is added, so that a cementing system mainly composed of ettringite and C-S-H / N-A-S-H double gel is formed, the industrial solid waste is utilized to reduce the cost, the environmental protection requirement is met, the interface adaptability of the special interface mortar for autoclaved aerated concrete is improved, and the adhesion, durability and construction performance of the special interface mortar for autoclaved aerated concrete are significantly improved.

[0018] 2. In the application, a water reducing agent and graphene oxide are added to the special interface mortar for autoclaved aerated concrete, so that a synergistic system of "organic flexible connection-inorganic nano enhancement" is formed: the water reducing agent solves the problems of interface combination and deformation compatibility through chemical bonding and flexible connection, and the graphene oxide strengthens the mechanical properties and crack resistance through nano filling and crystal nucleus effect; the water reducing agent and the graphene oxide synergistically improve the water-resistant adhesion strength and freeze-thaw cycle resistance of the mortar, and effectively solve the core problems of weak adhesion, easy hollowing and poor durability of the interface mortar for autoclaved aerated concrete.

[0019] 3. The special interface mortar for autoclaved aerated concrete prepared by the application has the characteristics of good water retention, strong impermeability, high adhesion tensile strength, water resistance, heat resistance and freeze-thaw resistance, and meets the JC / T890-2017 standard. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the application will be clearly and completely described below. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the application.

[0021] The application provides a special interface mortar for autoclaved aerated concrete and a preparation process thereof through a large number of experimental researches.

[0022] The application optimizes the special interface mortar for autoclaved aerated concrete from multiple dimensions of interface bonding, mechanical properties, deformation coordination, durability, etc. The alkali activator composed of lime, anhydrous aluminum sulfate, desulfurized gypsum and sucrose can effectively activate the activity of diatomite and feldspar tailings powder, form a cementing system mainly composed of ettringite and C-S-H / N-A-S-H double gel, replace part of the cement, not only reduce the cost by using industrial solid waste, but also meet the environmental protection requirements, and is conducive to improving the interface adaptability with autoclaved aerated concrete, and significantly improving the adhesion, durability and construction performance of the special interface mortar for autoclaved aerated concrete. The combination of water reducing agent and graphene oxide dispersion liquid forms a synergistic system of “organic flexible connection-inorganic nano enhancement”: the water reducing agent solves the problems of interface bonding and deformation compatibility through chemical bonding and flexible connection, and the graphene oxide strengthens the mechanical properties and crack resistance of the body through nano-filling and crystal nucleus effect; both of them improve the water-resistant bonding strength and freeze-thaw cycle resistance of the mortar, and effectively solve the core problems of weak bonding, easy hollowing and poor durability of the interface mortar for autoclaved aerated concrete.

[0023] Example 1

[0024] A special interface mortar for autoclaved aerated concrete, including the following components by weight fraction: dry mixture and liquid material; the dry mixture includes Portland cement 20 kg, diatomite 10 kg, feldspar tailings powder 5 kg, heavy calcium 10 kg, sand 50 kg, hydroxypropyl methylcellulose ether 0.2 kg, redispersible latex powder 1 kg, polyvinyl alcohol 0.1 kg, alkali activator 0.7 kg; the liquid material includes graphene oxide 0.025 kg, water 20 kg, water reducing agent 0.1 kg.

[0025] In order to improve the activity of diatomite, in this embodiment, the diatomite is first calcined at 800 DEG C for 1 h to dehydrate opal and kaolinite in it to form amorphous substances, and then ground for 15 min to further improve the specific surface area and activity of the diatomite.

[0026] In this embodiment, the alkali activator includes lime, anhydrous aluminum sulfate, desulfurized gypsum and sucrose, and the mass ratio of lime, anhydrous aluminum sulfate, desulfurized gypsum and sucrose is 40:1.4:1.8:0.11.

[0027] Lime as a basic activator provides an alkaline environment, promotes the dissolution of silicate and aluminate minerals, generates Ca 2+ and hydroxyl ions to provide calcium source for C-S-H gel formation. Anhydrous aluminum sulfate provides aluminum source, regulates pH, and releases Si 4+ and Al³ + ions in diatomite and feldspar tailings powder to form N-A-S-H (sodium aluminum silicate) gel, and Ca 2+The reaction generates C-A-S-H (calcium aluminate silicate) gel, forms a double gel system, and significantly improves the bonding strength of the interface mortar; desulfurized gypsum provides sulfate ions, which synergistically promote the generation of ettringite, whose needle-shaped crystals fill the pores, significantly improving the early strength, Ca + 2+ The reaction generates C-S-H gel with the silicon dioxide in diatomite, optimizes the microstructure, reduces the shrinkage rate, and reduces the risk of interface cracking; sucrose is complexed with Ca 2+ The reaction generates C-S-H gel with the silicon dioxide in diatomite, optimizes the microstructure, reduces the shrinkage rate, and reduces the risk of interface cracking; sucrose is complexed with Ca

[0028] In this embodiment, the water reducing agent is prepared by the following method:

[0029] S1, mix monomer isopentenyl polyoxyethylene ether 1.25 mol, monomer 3-acryloyloxypropyl triethoxysilane, and initiator (ammonium persulfate), and heat to 60°C;

[0030] S2, under stirring, simultaneously add monomer caffeic acid-containing ethanol solution and mercaptoethanol aqueous solution dropwise, and continue the reaction for 3-5 h;

[0031] The molar ratio of isopentenyl polyoxyethylene ether, 3-acryloyloxypropyl triethoxysilane, and caffeic acid is 1.25:0.58:1; the initiator is 1.8% of the total mass of the monomers; mercaptoethanol is 0.5% of the total mass of the monomers; the concentration of the monomer caffeic acid-containing ethanol solution is 0.8 g / L, and the concentration of the mercaptoethanol aqueous solution is 0.5 g / L;

[0032] S3, after the reaction is completed, deionized water is added to adjust the solid content of the product system to 30%, and after being lowered to room temperature, dialysis purification is performed to obtain the water reducing agent.

[0033] In this embodiment, the portland cement is ordinary portland cement 42.5.

[0034] ​The water reducing agent in the application is polymerized from three monomers of isoprenyl polyoxyethylene ether, 3-acryloyloxypropyl triethoxysilane and caffeic acid, and has flexibility of organic chain segment and reactivity of inorganic interface. The ethoxyl group of 3-acryloyloxypropyl triethoxysilane is hydrolyzed in water to generate silanol, which can form Si-O-Si covalent bond with silicate groups on the surface of autoclaved aerated concrete and condensation reaction with hydroxyl groups of cement hydration products, thereby constructing a “molecular bridge” between the autoclaved aerated concrete and the mortar and significantly improving the interfacial bonding strength. The phenolic hydroxyl and carboxyl groups of caffeic acid can react with calcium hydroxide generated by cement hydration to generate stable calcium salt or coordination compound, promote the crosslinking of the polymer and the cement matrix, and reduce the weak layer in the interfacial transition zone. Meanwhile, the long-chain polyether segment of isoprenyl polyoxyethylene ether has good flexibility, forms an “elastic buffer layer” in the mortar, relieves the shrinkage / expansion stress of the autoclaved aerated concrete substrate caused by changes in temperature and humidity, and reduces the risk of cracking of the interfacial mortar. The hydrophilicity and hydrophobicity of the polymer molecular chain are balanced, which can fill the capillary pores inside the mortar and reduce the water penetration channel; at the same time, the propyl hydrophobic segment of silane forms a weakly hydrophobic film at the interface, reduces the early water loss of the mortar caused by the rapid water absorption of the autoclaved aerated concrete substrate, and ensures the full hydration of the cement. In addition, the antioxidant property of caffeic acid can reduce the degradation of the polymer chain in a humid environment, maintain the long-term water-resistant bonding strength of the mortar, and avoid the decrease in the bonding strength caused by the failure of the traditional interfacial mortar after water resistance. Graphene oxide contains rich oxygen-containing functional groups such as hydroxyl, carboxyl and epoxy groups and nanoscale effect. Its high specific surface area and oxygen-containing functional groups form strong physical adsorption and chemical combination such as hydrogen bond and coordination bond with the cement hydration products, and at the same time, form an “anchoring effect” with the porous structure on the surface of the autoclaved aerated concrete, further improving the interfacial bonding strength. Its sheet structure can fill the micro-pores of the mortar, refine the pore size distribution, improve the density of the mortar body, thereby enhancing the compressive strength and impermeability, reducing the interfacial debonding caused by water intrusion, and at the same time, the nanosheet can block the stress concentration at the crack tip through “bridging effect”, inhibit the expansion of the micro-cracks in the cement stone, and further reduce the cracking sensitivity of the mortar in cooperation with the flexibility of the water reducing agent. The surface active sites of graphene oxide can act as “nuclei” for cement hydration, accelerate the generation and growth of C-S-H gel, shorten the hydration induction period, and solve the problems of insufficient early strength and easy disturbance damage of the mortar. Its chemical stability enhances the carbonation resistance and chloride ion penetration resistance of the mortar, reduces the erosion of the interface by the environment medium; at the same time, the stability of its dispersion liquid can avoid the agglomeration of nanoparticles, ensure the uniform distribution in the mortar, and play a long-term strengthening role.

[0035] In the embodiment, the redispersible latex powder is a vinyl acetate-ethylene-vinyl versatate copolymer latex powder.

[0036] Example 2

[0037] An interface mortar special for autoclaved aerated concrete, including the following components by weight fraction: dry mixture and liquid material; the dry mixture includes Portland cement 25 kg, diatomite 12 kg, feldspar tailings powder 7 kg, heavy calcium 12 kg, sand 58 kg, hydroxypropyl methyl cellulose ether 0.25 kg, redispersible latex powder 2 kg, polyvinyl alcohol 0.15 kg, alkali activator 1.0 kg; the liquid material includes graphene oxide 0.030 kg, water 25 kg, water reducing agent 0.15 kg.

[0038] In the embodiment, the diatomite is calcined at 850 DEG C for 1.5 h and then ground for 18 min.

[0039] In the embodiment, the alkali activator includes lime, anhydrous aluminum sulfate, desulfurized gypsum and sucrose, and the mass ratio of the lime, the anhydrous aluminum sulfate, the desulfurized gypsum and the sucrose is 45:1.5:2.0:0.17.

[0040] In the embodiment, the water reducing agent is prepared by the following method:

[0041] S1, the monomer iso-pentenyl polyoxyethylene ether, the monomer 3-acryloyloxypropyl triethoxysilane and the initiator (ammonium persulfate) are mixed, and the temperature is raised to 65 DEG C;

[0042] S2, the ethanol solution containing the monomer caffeic acid and the aqueous mercaptoethanol solution are added dropwise simultaneously under stirring, and the reaction is continued for 4 h;

[0043] The molar amount ratio of the iso-pentenyl polyoxyethylene ether, the 3-acryloyloxypropyl triethoxysilane and the caffeic acid is 1.35:0.60:1.11; the initiator is 2.0% of the total mass of the monomers; the mercaptoethanol is 1.0% of the total mass of the monomers; the concentration of the ethanol solution containing the monomer caffeic acid is 1.0 g / L, and the concentration of the aqueous mercaptoethanol solution is 0.65 g / L;

[0044] S3, after the reaction is completed, deionized water is added, the solid content of the product system is adjusted to 35%, and after the temperature is lowered to room temperature, the product is purified by dialysis.

[0045] In the embodiment, the Portland cement is ordinary Portland cement 42.5.

[0046] In the embodiment, the redispersible latex powder is a vinyl acetate-ethylene-vinyl versatate copolymer latex powder.

[0047] Embodiment 3

[0048] An interface mortar special for autoclaved aerated concrete, including the following components by weight fraction: dry mixture and liquid material; the dry mixture includes Portland cement 28 kg, diatomite 15 kg, feldspar tailings powder 8 kg, heavy calcium 15 kg, sand 65 kg, hydroxypropyl methyl cellulose ether 0.3 kg, redispersible latex powder 3 kg, polyvinyl alcohol 0.2 kg, alkali activator 1.2 kg; the liquid material includes graphene oxide 0.036 kg, water 30 kg, water reducing agent 0.2 kg.

[0049] In the embodiment, the diatomite is calcined at 900 DEG C for 2 h and then ground for 20 min.

[0050] In the embodiment, the alkali activator includes lime, anhydrous aluminum sulfate, desulfurized gypsum and sucrose, and the mass ratio of the lime, the anhydrous aluminum sulfate, the desulfurized gypsum and the sucrose is 48:1.6:2.3:0.23.

[0051] In the embodiment, the water reducing agent is prepared by the following method:

[0052] S1, the monomer iso-pentenyl polyoxyethylene ether, the monomer 3-acryloyloxypropyl triethoxysilane and the initiator (ammonium persulfate) are mixed, and the temperature is raised to 70 DEG C;

[0053] S2, the ethanol solution containing the monomer caffeic acid and the aqueous mercaptoethanol solution are simultaneously added dropwise under stirring, and the reaction is continued for 5 h;

[0054] The molar amount ratio of the iso-pentenyl polyoxyethylene ether, the 3-acryloyloxypropyl triethoxysilane and the caffeic acid is 1.50:0.62:1.23; the initiator is 2.2% of the total mass of the monomers; the mercaptoethanol is 1.5% of the total mass of the monomers; the concentration of the ethanol solution containing the monomer caffeic acid is 1.2 g / L, and the concentration of the aqueous mercaptoethanol solution is 0.8 g / L;

[0055] S3, after the reaction is completed, deionized water is added, the solid content of the product system is adjusted to 40%, and after being reduced to room temperature, dialysis purification is carried out, and the water reducing agent is obtained.

[0056] In the embodiment, the Portland cement is ordinary Portland cement 42.5.

[0057] In the embodiment, the redispersible latex powder is a vinyl acetate-ethylene-vinyl versatate copolymer latex powder.

[0058] The preparation process of the interface mortar special for autoclaved aerated concrete includes the following steps:

[0059] (1) under weak acid conditions, the graphene oxide is added into water, ultrasonic treatment is carried out for 10 min, then the water reducing agent is added, stirring is carried out at 60 DEG C for 1.5 h, and the liquid material is obtained;

[0060] (2) Mix the silicate cement, diatomite, feldspar tailings powder, heavy calcium and sand uniformly, then add the alkali activator, hydroxypropyl methyl cellulose ether, redispersible latex powder and polyvinyl alcohol, mix uniformly to obtain dry mixture;

[0061] (3) Slowly add the liquid material into the dry mixture, stir until the slurry is uniform, to obtain the special interface mortar for autoclaved aerated concrete.

[0062] Comparative Example 1

[0063] The same as Example 1, except that no water reducing agent is added.

[0064] Comparative Example 2

[0065] The same as Example 1, except that no diatomite, feldspar tailings powder and alkali activator are added.

[0066] Performance Test

[0067] According to the standard of JC / T890-2017, the performance of the special interface mortar for autoclaved aerated concrete prepared in Example 1-Example 3 and Comparative Example 1 and Comparative Example 2 is tested, and the results are shown in Table 1.

[0068] Table 1. Performance test results

[0069]

[0070] As can be seen from Table 1, the special interface mortar for autoclaved aerated concrete prepared in Example 1-Example 3 has the characteristics of good water retention, strong impermeability, high bonding tensile strength, and resistance to water, heat and freeze-thaw, and meets the standard of JC / T890-2017.

[0071] Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements to part of the technical features, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An interface mortar for autoclaved aerated concrete, characterized in that: The raw material comprises the following components by weight parts: dry mixture and liquid material; the dry mixture comprises Portland cement 20-28 parts, diatomite 10-15 parts, feldspar tailings powder 5-8 parts, heavy calcium 10-15 parts, sand 50-65 parts, hydroxypropyl methyl cellulose ether 0.2-0.3 parts, redispersible latex powder 1-3 parts, polyvinyl alcohol 0.1-0.2 parts, alkali activator 6-8 parts; the liquid material comprises graphene oxide 0.025-0.036 parts, water 20-30 parts, water reducing agent 0.1-0.2 parts; the alkali activator comprises lime, anhydrous aluminum sulfate, desulfurized gypsum and sucrose, and the mass ratio of lime, anhydrous aluminum sulfate, desulfurized gypsum and sucrose is (40-48):(1.4-1.6):(1.8-2.3):(0.11-0.23); the water reducing agent is prepared by the following method: S1, monomer isopentenyl polyoxyethylene ether, monomer 3-acryloyloxypropyl triethoxysilane and initiator are mixed, and the temperature is raised to 60-70 DEG C; S2, the ethanol solution containing monomer caffeic acid and the aqueous mercaptoethanol solution are added dropwise under stirring, and the reaction is continued for 3-5 h; S3, after the reaction is completed, deionized water is added, the solid content of the product system is adjusted to 30-40%, and after the temperature is lowered to room temperature, dialysis purification is carried out, and the water reducing agent is obtained.

2. The special interface mortar for autoclaved aerated concrete according to claim 1, characterized in that: The diatomite is treated by calcination at 800-900 DEG C and powder grinding activation process.

3. The special interface mortar for autoclaved aerated concrete according to claim 1, characterized in that: The molar amount ratio of the isopentenyl polyoxyethylene ether, 3-acryloyloxypropyl triethoxysilane and caffeic acid is (1.25-1.50):(0.58-0.62):(1-1.23).

4. The special-purpose interface mortar for autoclaved aerated concrete according to claim 1, characterized in that: The initiator is 1.8-2.2% of the total mass of monomers; the mercaptoethanol is 0.5-1.5% of the total mass of monomers.

5. The specialized interface mortar for autoclaved aerated concrete according to claim 1, characterized in that: The concentration of the ethanol solution containing monomer caffeic acid is 0.8-1.2 g / L, and the concentration of the aqueous mercaptoethanol solution is 0.5-0.8 g / L.

6. The specialized interface mortar for autoclaved aerated concrete according to claim 1, characterized in that: The Portland cement is ordinary Portland cement 42.

5.

7. The specialized interface mortar for autoclaved aerated concrete according to claim 1, characterized in that: The redispersible latex powder is vinyl acetate-ethylene-vinyl versatate copolymer latex powder.

8. Process for the preparation of an interface mortar for autoclaved aerated concrete according to any one of claims 1 to 7, characterized in that: The method comprises the following steps: (1) under weak acid conditions, the graphene oxide is added into water, ultrasonic treatment is carried out for 5-10 min, then the water reducing agent is added, stirring is carried out at 55-65 DEG C for 1-1.5 h, and the liquid material is obtained; (2) the Portland cement, diatomite, feldspar tailings powder, heavy calcium and sand are uniformly mixed, then the alkali activator, hydroxypropyl methyl cellulose ether, redispersible latex powder and polyvinyl alcohol are added and uniformly mixed, and the dry mixture is obtained; (3) the liquid material is slowly added into the dry mixture, and stirring is carried out until the slurry is uniform, and the interface mortar special for autoclaved aerated concrete is obtained.

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