A kind of high-content waste aerated sand foam concrete building block and preparation method thereof

Abstract

The present invention provides a high-dosage waste aerated sand foam concrete building block and a preparation method thereof, and relates to the technical field of resource recycling of decoration waste. The foam concrete building block provided by the present invention comprises the following raw materials by mass: 9 to 28 parts of cement, 6 to 21 parts of mineral powder, 60 to 80 parts of waste aerated sand, 0.005 to 0.01 parts of hydroxypropyl methylcellulose, 0.1 to 0.2 parts of redispersible latex powder, 0.05 to 0.1 parts of styrene-butadiene emulsion, 0.3 to 0.4 parts of water reducer, 0.04 to 0.08 parts of collapse retaining agent, 0.01 to 0.02 parts of air entraining agent, 0.03 to 0.15 parts of physical foaming agent, 0.1 to 0.2 parts of waste engine oil, 0.01 to 0.02 parts of emulsifier, and 40 to 52 parts of water. The foam concrete building block provided by the present invention has a high usage of waste aerated brick sand, high foam stability, light weight, high strength, and good thermal insulation performance.

Description

Technical Field

[0001] The invention relates to the technical field of resource recycling of waste aerated blocks, and in particular to a high-dosage waste aerated sand foam concrete building block and a preparation method thereof. Background Art

[0002] Foam concrete blocks refer to lightweight concrete blocks with a large number of closed pores inside. They are lightweight and porous, and also have material properties such as thermal insulation, heat insulation, fire resistance, and good frost resistance. They also have good physical and mechanical properties and are very good building energy-saving materials. At present, the production of foam concrete blocks is mainly done by using mechanical methods to prepare foam from a foaming agent aqueous solution, and then evenly mixing the obtained foam with a slurry made of silicon-calcium material, magnesia material or gypsum material, and then casting and curing them.

[0003] Renovation waste is an important product of economic development and urbanization. Treatment of renovation waste by dumping or landfilling will cause serious environmental problems and seriously affect sustainable development. How to better handle and recycle the huge amount of renovation waste is a more important task at this stage. The main components of renovation waste include inorganic building materials, organic plastic and rubber products, metal products, etc. Among them, waste aerated blocks account for more than 60% of the volume, and are currently mainly disposed of by landfill.

[0004] The related technology proposes to strengthen the waste aerated brick powder by ball milling and coupling agent modification, and use the modified waste aerated brick powder as the main component to prepare lightweight concrete through a scheme combining an alkali activation system with 3D printing technology. The above preparation scheme of modified waste aerated brick powder has high cost and energy consumption, and the dry material mass of waste aerated brick powder accounts for only about 30%, making it difficult to consume waste aerated bricks on a large scale. The related technology proposes to use decoration waste with a particle size of less than 4.75 mm as the main raw material to prepare foamed concrete through a physical foaming scheme. The dry mass of decoration waste in this scheme accounts for about 30%, and its components include high-strength concrete, bricks and tiles, ceramics, glass, etc., of which waste aerated bricks only account for a part.

[0005] Waste aerated blocks are mainly made of fly ash, cement, sand, lime, gypsum and gas generating agents. Due to their low strength, it is extremely difficult to recycle them. How to achieve the large-scale disposal of waste aerated blocks is a technical problem that needs to be solved urgently. Summary of the invention

[0006] In view of this, the object of the present invention is to provide a high-content waste aerated sand foam concrete block and a preparation method thereof. The foam concrete block provided by the present invention has a high content of waste aerated sand, which is 60% to 80% of the mass of dry materials, and the foam concrete block has the characteristics of light weight, high strength and good thermal insulation performance.

[0007] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0008] The present invention provides a high-content waste aerated sand foam concrete building block, comprising the following preparation raw materials in parts by weight:

[0009] 9-28 parts of cement, 6-21 parts of mineral powder, 60-80 parts of waste aerated sand, 0.005-0.01 parts of hydroxypropyl methylcellulose, 0.1-0.2 parts of redispersible latex powder, 0.05-0.1 parts of styrene-butadiene emulsion, 0.3-0.4 parts of water reducer, 0.04-0.08 parts of collapse retaining agent, 0.01-0.02 parts of air entraining agent, 0.03-0.15 parts of physical foaming agent, 0.1-0.2 parts of waste engine oil, 0.01-0.02 parts of emulsifier, and 40-52 parts of water; the waste aerated sand is obtained by crushing waste aerated blocks.

[0010] Preferably, the cement is ordinary Portland cement with a strength grade of ≥42.5.

[0011] Preferably, the mineral powder is granulated blast furnace slag powder, and the granulated blast furnace slag powder includes S95 and / or S105 grades.

[0012] Preferably, the particle size of the waste aerated sand is 0-4.75 mm, and is not 0.

[0013] Preferably, the molecular weight of the hydroxypropyl methylcellulose is ≥4000.

[0014] Preferably, the solid content of the styrene-butadiene emulsion is ≥40wt%.

[0015] Preferably, the water reducer is a polycarboxylic acid high-efficiency water reducer with a water reduction rate of ≥25%.

[0016] Preferably, the physical foaming agent is an animal protein foaming agent.

[0017] Preferably, the viscosity of the waste engine oil is less than 50 Pa.s.

[0018] The present invention provides a method for preparing a high-content waste aerated sand foam concrete block as described in the above technical solution, comprising the following steps:

[0019] Mixing cement, mineral powder, waste aerated sand, hydroxypropyl methylcellulose and redispersible latex powder to obtain a dry mix;

[0020] The waste engine oil, the emulsifier and the first portion of water are mixed and emulsified to obtain a waste engine oil emulsion;

[0021] Mixing the styrene butadiene emulsion with a second portion of water to obtain a styrene butadiene emulsion dilution;

[0022] The physical foaming agent and the third portion of water are mixed and foamed to obtain foam;

[0023] The dry blend is mixed with waste oil emulsion, styrene butadiene emulsion diluent, water reducing agent, slump retaining agent, air entraining agent and the remaining water to obtain slurry;

[0024] After the slurry is mixed with the foam, casting and curing are performed in sequence to obtain the high-content waste aerated sand foam concrete building block.

[0025] The invention provides a high-dosage waste aerated sand foam concrete building block, which comprises the following raw materials in parts by weight: 9-28 parts of cement, 6-21 parts of mineral powder, 60-80 parts of waste aerated sand, 0.005-0.01 parts of hydroxypropyl methylcellulose, 0.1-0.2 parts of redispersible latex powder, 0.05-0.1 parts of styrene-butadiene emulsion, 0.3-0.4 parts of water reducer, 0.04-0.08 parts of collapse retaining agent, 0.01-0.02 parts of air entraining agent, 0.03-0.15 parts of physical foaming agent, 0.1-0.2 parts of waste engine oil, 0.01-0.02 parts of emulsifier and 40-52 parts of water; the waste aerated sand is obtained by crushing waste aerated blocks. The present invention crushes the waste aerated blocks into aerated sand, and combines adhesive materials such as cement and mineral powder, admixtures such as water reducer and collapse retainer, foam stabilizing component hydroxypropyl methylcellulose, redispersible latex powder, styrene-butadiene emulsion, surface tension regulating component air entraining agent and emulsified waste engine oil (emulsifier is used to emulsify waste engine oil) and foaming agent as components of foam concrete building blocks. The foam concrete building blocks have the characteristics of large proportion of waste aerated sand dry mass, light building blocks, high strength, good thermal insulation performance, etc. At the same time, air entraining agent and emulsified waste engine oil are used to regulate the interfacial tension of the foam, greatly increasing the foam stabilizing performance, greatly improving the working performance of the foam slurry, meeting the requirements of on-site casting for transportation over a certain distance, improving product application scenarios, promoting the resource disposal of waste aerated blocks, and increasing product added value.

[0026] The foamed concrete blocks provided by the present invention have a high content of waste aerated sand, are light in weight, high in strength, and have high foam stability. The results of the examples show that the density of the foamed concrete blocks provided by the present invention is 610-820 kg / m 3 , compressive strength is 3.5~7.7MPa, and thermal conductivity is 0.12~0.18W / (m·K). DETAILED DESCRIPTION

[0027] The present invention provides a high-content waste aerated sand foam concrete building block, comprising the following preparation raw materials in parts by weight:

[0028] 9-28 parts of cement, 6-21 parts of mineral powder, 60-80 parts of waste aerated sand, 0.005-0.01 parts of hydroxypropyl methylcellulose, 0.1-0.2 parts of redispersible latex powder, 0.05-0.1 parts of styrene-butadiene emulsion, 0.3-0.4 parts of water reducer, 0.04-0.08 parts of collapse retaining agent, 0.01-0.02 parts of air entraining agent, 0.03-0.15 parts of physical foaming agent, 0.1-0.2 parts of waste engine oil, 0.01-0.02 parts of emulsifier, and 40-52 parts of water; the waste aerated sand is obtained by crushing waste aerated blocks.

[0029] In the present invention, unless otherwise specified, all raw materials involved are commercially available products.

[0030] The raw materials for preparing the foamed concrete blocks provided by the present invention include 9 to 28 parts of cement by weight, which may be 6 parts, 10 parts, 14 parts, 21 parts or 28 parts. In the present invention, the cement is preferably ordinary Portland cement, and the strength grade is preferably ≥42.5.

[0031] Based on the mass fraction of the cement, the raw materials for preparing the foamed concrete blocks provided by the present invention include 6 to 21 parts of mineral powder, which can be 6 parts, 9 parts, 12 parts or 21 parts. In the present invention, the mineral powder is preferably granulated blast furnace slag powder, and the granulated blast furnace slag powder preferably includes S95 and / or S105 grades. The use of granulated blast furnace slag powder of the grades is beneficial to improving the interface structure of the blocks, improving the strength and enhancing the anti-seepage and anti-corrosion capabilities.

[0032] Based on the mass fraction of the cement, the raw materials for preparing the foamed concrete blocks provided by the present invention include 60 to 80 parts of waste aerated sand, which can be 60 parts, 70 parts or 80 parts. In the present invention, the waste aerated sand is obtained by crushing waste aerated blocks; the particle size of the waste aerated sand is preferably 0 to 4.75 mm, and is not 0. The present invention preferably sieves the crushed waste aerated blocks to obtain waste aerated sand of the particle size. In the present invention, the amount of the waste aerated sand is high, so that a large amount of waste aerated sand can be disposed of.

[0033] Based on the mass fraction of the cement, the raw materials for preparing the foamed concrete blocks provided by the present invention include 0.005 to 0.01 parts of hydroxypropyl methylcellulose, which may be 0.005, 0.006, 0.007, 0.008, 0.009 or 0.01 parts. In the present invention, the molecular weight of the hydroxypropyl methylcellulose is preferably ≥4000, and the amount of the hydroxypropyl methylcellulose decreases accordingly with the increase of its molecular weight. In the present invention, the hydroxypropyl methylcellulose can effectively play the role of thickening and stabilizing foam.

[0034] Based on the mass fraction of the cement, the raw materials for preparing the foamed concrete blocks provided by the present invention include 0.1 to 0.2 parts of redispersible latex powder, which can be 0.1 parts, 0.15 parts or 0.2 parts. In the present invention, the redispersible latex powder has the functions of improving the flowability of the slurry, increasing thixotropy and anti-sagging, improving cohesion, enhancing water retention, alkali resistance and water resistance, and forming a grid structure with hydroxypropyl methylcellulose, styrene butadiene emulsion and other ingredients.

[0035] Based on the mass fraction of the cement, the raw material for preparing the foamed concrete building block provided by the present invention includes 0.05-0.1 part of styrene-butadiene emulsion, which can be 0.05 part, 0.06 part, 0.07 part, 0.08 part, 0.09 part or 0.1 part. In the present invention, the solid content of the styrene-butadiene emulsion is preferably ≥40wt%. In the present invention, the styrene-butadiene emulsion has good film formation and excellent alkali resistance, can adjust the slurry viscosity, and improve the waterproof performance of the building block.

[0036] Based on the mass fraction of the cement, the raw materials for preparing the foamed concrete blocks provided by the present invention include 0.3-0.4 parts of a water reducer, which may be 0.3 parts, 0.35 parts or 0.4 parts. In the present invention, the water reducer is preferably a polycarboxylic acid high-efficiency water reducer, and the water reduction rate is preferably ≥25%.

[0037] Based on the mass fraction of the cement, the raw materials for preparing the foamed concrete blocks provided by the present invention include 0.04 to 0.08 parts of a slump retaining agent, which may be 0.04, 0.05, 0.06, 0.07 or 0.08 parts. In the present invention, the slump retaining agent is preferably a polycarboxylic acid high slump retaining slow-release type.

[0038] Based on the mass fraction of the cement, the raw materials for preparing the foamed concrete blocks provided by the present invention include 0.01 to 0.02 parts of air entraining agent, which can be 0.01 parts or 0.02 parts. In the present invention, the air entraining agent preferably includes one or more of rosin resins, alkyl sulfonic acids, alkyl aromatic sulfonic acids, fatty alcohol sulfonates and saponins. In the present invention, the role of the air entraining agent is to adjust the surface tension, reduce the free energy of the slurry, make the bubble size uniform, reduce the migration speed, and improve the foam stabilization performance of the slurry.

[0039] Based on the mass fraction of the cement, the raw materials for preparing the foamed concrete blocks provided by the present invention include 0.03 to 0.15 parts of a physical foaming agent, which may be 0.035 parts, 0.05 parts, 0.06 parts, 0.07 parts, 0.09 parts, 0.1 parts or 0.14 parts. In the present invention, the foaming agent is preferably an animal protein foaming agent, and the use of an animal protein foaming agent in the present invention is beneficial to improving the stability of the foam and the closed porosity of the pores inside the block.

[0040] Based on the mass fraction of the cement, the raw material for preparing the foamed concrete block provided by the present invention includes 0.1 to 0.2 parts of waste engine oil, which can be 0.1 parts, 0.15 parts or 0.2 parts. In the present invention, the waste engine oil is general waste engine oil, and the viscosity is preferably less than 50 Pa.s.

[0041] Based on the mass fraction of the cement, the raw materials for preparing the foam concrete blocks provided by the present invention include 0.01 to 0.02 parts of emulsifier, which can be 0.01 parts or 0.02 parts. The present invention has no special requirements for the emulsifier, and an emulsifier familiar to those skilled in the art can be used. In an embodiment of the present invention, the emulsifier is preferably emulsifier OS-15 and / or OP-10, purchased from Hai'an Petrochemical Plant in Jiangsu Province. In the present invention, the emulsifier is used to emulsify waste engine oil, and the emulsified waste engine oil can adjust the interfacial tension of the foam, adjust the size and uniformity of the bubbles, and significantly improve the foam stabilization performance.

[0042] Based on the mass fraction of the cement, the raw materials for preparing the foamed concrete blocks provided by the present invention include 40 to 52 parts of water, which can be 40 parts, 43 parts, 45 parts, 46 parts, 47 parts, 50 parts, 51 parts or 52 parts. The present invention has no special requirements for the water, and general municipal water can be used.

[0043] The invention crushes the waste aerated blocks into aerated brick sand, and mixes with adhesive materials such as cement and specific additives to obtain lightweight and high-strength foamed concrete blocks in a physical foaming manner, and the amount of waste aerated sand used is high.

[0044] The present invention provides a method for preparing a high-content waste aerated sand foam concrete block as described in the above technical solution, comprising the following steps:

[0045] Mixing cement, mineral powder, waste aerated sand, hydroxypropyl methylcellulose and redispersible latex powder to obtain a dry mix;

[0046] The waste engine oil, the emulsifier and the first portion of water are mixed and emulsified to obtain a waste engine oil emulsion;

[0047] Mixing the styrene butadiene emulsion with a second portion of water to obtain a styrene butadiene emulsion dilution;

[0048] The physical foaming agent and the third portion of water are mixed and foamed to obtain foam;

[0049] The dry blend is mixed with waste oil emulsion, styrene butadiene emulsion diluent, water reducing agent, slump retaining agent, air entraining agent and the remaining water to obtain slurry;

[0050] After the slurry is mixed with the foam, casting and curing are performed in sequence to obtain the high-content waste aerated sand foam concrete building block.

[0051] The present invention mixes cement, mineral powder, waste aerated sand, hydroxypropyl methylcellulose and redispersible latex powder to obtain a dry mix. The present invention has no special requirements on the method of mixing the cement, mineral powder, waste aerated sand, hydroxypropyl methylcellulose and redispersible latex powder, and the components can be uniformly mixed using a mixing method well known to those skilled in the art.

[0052] The present invention mixes waste engine oil, an emulsifier and a first portion of water for emulsification to obtain a waste engine oil emulsion. In the present invention, the mass ratio of the first portion of water to the waste engine oil is preferably 50:1. In the present invention, the emulsification is preferably carried out under high-speed stirring conditions, the speed of the high-speed stirring is preferably 5000 to 10000 r / min, and the time is preferably 30 to 60 min.

[0053] The present invention mixes the styrene butadiene emulsion and the second part of water to obtain a styrene butadiene emulsion dilution. In the present invention, the mass ratio of the second part of water to the styrene butadiene emulsion is preferably 50:1, and the second part of water is used to dilute the styrene butadiene emulsion.

[0054] The present invention mixes a physical foaming agent and a third portion of water to foam to obtain foam. In the present invention, the mass ratio of the third portion of water to the physical foaming agent is preferably 30:1, and the third portion of water is used to dilute the physical foaming agent. The present invention has no special requirements for the foaming method, and a foaming method well known to those skilled in the art can be used. In the present invention, the density of the foam is preferably 90 to 120 kg / m 3 .

[0055] After obtaining the dry mix, waste engine oil emulsion, styrene butadiene emulsion dilution and foam, the present invention mixes the dry mix with the waste engine oil emulsion, styrene butadiene emulsion dilution, water reducer, slump retainer, air entraining agent and the remaining water to obtain slurry; after mixing the slurry with the foam, casting and curing are carried out in sequence to obtain the foam concrete block.

[0056] In the present invention, the first part of water, the second part of water, the third part of water and the remaining part of water constitute the entire preparation water of the foamed concrete block. In the present invention, after the pouring and forming, the obtained molded body is preferably cut. In the present invention, the curing is preferably standard curing. In the embodiment of the present invention, the time of the standard curing is preferably 28 days.

[0057] In order to further illustrate the present invention, the high-content waste aerated sand foam concrete block and the preparation method thereof provided by the present invention are described in detail below in conjunction with examples, but they should not be understood as limiting the scope of protection of the present invention.

[0058] Examples 1 to 7 and Comparative Examples 1 to 2

[0059] The raw materials and dosages of the foam concrete blocks of Examples 1 to 7 and Comparative Examples 1 to 2 are shown in Table 1. The molecular weight of hydroxypropyl methylcellulose in Table 1 is 4000, purchased from Shandong Heda Group Co., Ltd., with a brand name of 60HD4000; polycarboxylic acid high-efficiency water reducer is purchased from Guangdong Hongqiang New Materials Co., Ltd., with a brand name of JSM1; redispersible latex powder is purchased from Langfang Tianya Energy Saving Technology Co., Ltd., with a brand name of 3214; the solid content of the styrene-butadiene emulsion is 51-53%, purchased from Dongguan Haili Holding Group Co., Ltd., with a brand name of 7257; the viscosity of the waste oil is 20 Pa.s; the emulsifier is an emulsifier OS-15, purchased from Hai'an Petrochemical Plant in Jiangsu Province; the slump retaining agent is a polycarboxylic acid high-slump retaining sustained-release type, purchased from Guangdong Hongqiang New Materials Co., Ltd., with a brand name of CSP-11; the air entraining agent is purchased from Nanjing Xinyi Synthetic Technology Co., Ltd., with a brand name of AE330; and the animal protein foaming agent is purchased from Luoyang Tongrun Nano Technology Co., Ltd., with a brand name of TR-B.

[0060] Table 1 Raw materials for preparing foamed concrete blocks of Examples 1 to 7 and Comparative Examples 1 to 2 (parts by mass)

[0061]

[0062] The preparation methods of the foamed concrete blocks of Examples 1 to 7 and Comparative Examples 1 to 2 are as follows:

[0063] The waste aerated blocks are crushed and sieved to obtain waste aerated sand with a particle size of less than 4.75 mm;

[0064] Mixing cement, mineral powder, waste aerated sand, hydroxypropyl methylcellulose and redispersible latex powder to obtain a dry mix;

[0065] The waste engine oil, emulsifier and water were stirred and emulsified with a high-speed stirrer at a stirring speed of 5000 r / min for 30 min to obtain a waste engine oil emulsion, wherein the mass ratio of water to waste engine oil was 50:1;

[0066] Diluting the styrene butadiene emulsion with water to obtain a styrene butadiene emulsion dilution, wherein the mass ratio of water to the styrene butadiene emulsion is 50:1;

[0067] The foaming agent is diluted with water and foamed to obtain a foam with a density of 100 kg / m 3 , wherein the mass ratio of water to foaming agent is 30:1;

[0068] The dry blend, waste oil emulsion, styrene-butadiene emulsion diluent, water reducing agent, slump retaining agent, air entraining agent and balance water are mixed to obtain slurry;

[0069] The foam and the slurry are mixed, poured, cut and cured to obtain the foam concrete blocks.

[0070] Foam stabilization performance test: The foam stabilization performance of the slurry after adding foam to Examples 1 to 7 and Comparative Examples 1 to 2 was tested before pouring. The method is as follows: after adding foam to the slurry and stirring it evenly, continue stirring, and take samples at regular intervals to detect the bulk density of the slurry. The test data are shown in Table 2.

[0071] Table 2 Foam stability performance of foam concrete block slurry in Examples 1 to 7 and Comparative Examples 1 to 2

[0072]

[0073] It can be seen from Table 2 Comparative Example 1 that when the addition amount of hydroxypropyl methylcellulose, redispersible latex powder and styrene-butadiene emulsion is 0, the initial bulk density of the slurry increases slightly, indicating that the foam content inside the slurry decreases, and the foam stabilizing performance decreases, and with the increase of stirring time, the bulk density of the slurry gradually increases, the waste aerated sand has strong water absorption, the water retention performance of the slurry is insufficient, and the foam stabilizing performance further decreases; It can be seen from Examples 1 to 7 that after the slurry is foamed and stirred continuously, the bulk density of the slurry in the first 20 minutes does not change much, indicating that the bubble content in the slurry remains basically unchanged, and the bulk density increases slowly after 25 minutes, so the high-dosage waste aerated sand foam concrete block slurry of the present invention has excellent foam stabilizing performance.

[0074] The foamed concrete blocks of Examples 1 to 7 and Comparative Examples 1 to 2, which were cured for 28 days under standard conditions, were subjected to performance tests in accordance with JC / T 1062-2022 Foamed Concrete Blocks. The test results are shown in Table 3.

[0075] Table 3 Performance of foamed concrete blocks of Examples 1 to 7 and Comparative Examples 1 to 2

[0076]

[0077]

[0078] It can be seen from Table 3 that when the addition amount of hydroxypropyl methylcellulose, redispersible latex powder and styrene-butadiene emulsion is 0, the density of the block is significantly increased and the compressive strength is greatly reduced; it can be seen from Comparative Example 2 that when the addition amount of waste engine oil, emulsifier and air entraining agent is 0, the density of the block is greatly increased, there are only sporadic pores inside, and the thermal insulation performance is poor. When the mass proportion of the adhesive material is nearly 40% and the block is dense, the compressive strength is only slightly improved, indicating that the strength of the waste aerated sand is relatively low; it can be seen from Examples 1 to 7 that the high-dosage waste aerated sand foam concrete block of the present invention has the characteristics of small bulk density, high strength and low thermal conductivity.

[0079] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A high-content waste aerated sand foam concrete block, characterized in that: The preparation comprises the following raw materials in parts by weight: 9-28 parts of cement, 6-21 parts of mineral powder, 60-80 parts of waste aerated sand, 0.005-0.01 parts of hydroxypropyl methylcellulose, 0.1-0.2 parts of redispersible latex powder, 0.05-0.1 parts of styrene-butadiene emulsion, 0.3-0.4 parts of water reducer, 0.04-0.08 parts of collapse retaining agent, 0.01-0.02 parts of air entraining agent, 0.03-0.15 parts of physical foaming agent, 0.1-0.2 parts of waste engine oil, 0.01-0.02 parts of emulsifier, and 40-52 parts of water; the waste aerated sand is obtained by crushing waste aerated blocks.

2. The high-content waste aerated sand foam concrete block according to claim 1 is characterized in that: The cement is ordinary Portland cement with a strength grade of ≥42.

5.

3. The high-content waste aerated sand foam concrete block according to claim 1, characterized in that: The mineral powder is granulated blast furnace slag powder, and the granulated blast furnace slag powder includes S95 and / or S105 grades.

4. The high-content waste aerated sand foam concrete block according to claim 1, characterized in that: The particle size of the waste aerated sand is 0-4.75 mm, and is not 0.

5. The high-content waste aerated sand foam concrete block according to claim 1, characterized in that: The molecular weight of the hydroxypropyl methylcellulose is ≥4000.

6. The high-content waste aerated sand foam concrete block according to claim 1, characterized in that: The solid content of the styrene-butadiene emulsion is ≥40wt%.

7. The high-content waste aerated sand foam concrete block according to claim 1, characterized in that: The water reducing agent is a polycarboxylic acid high efficiency water reducing agent, and the water reducing rate is ≥25%.

8. The high-content waste aerated sand foam concrete block according to claim 1, characterized in that: The physical foaming agent is an animal protein foaming agent.

9. The high-content waste aerated sand foam concrete block according to claim 1, characterized in that: The viscosity of the waste oil is less than 50 Pa.s.

10. The method for preparing a foamed concrete block with high content of waste aerated sand according to any one of claims 1 to 9, characterized in that: The following steps are involved: Mixing cement, mineral powder, waste aerated sand, hydroxypropyl methylcellulose and redispersible latex powder to obtain a dry mix; The waste engine oil, the emulsifier and the first portion of water are mixed and emulsified to obtain a waste engine oil emulsion; Mixing the styrene butadiene emulsion with a second portion of water to obtain a styrene butadiene emulsion dilution; The physical foaming agent and the third portion of water are mixed and foamed to obtain foam; The dry blend is mixed with waste oil emulsion, styrene butadiene emulsion diluent, water reducing agent, slump retaining agent, air entraining agent and the remaining water to obtain slurry; After the slurry is mixed with the foam, casting and curing are performed in sequence to obtain the high-content waste aerated sand foam concrete building block.

Images