Solid waste-based thin-bed masonry mortar and preparation method and use method thereof

Abstract

This invention relates to the field of masonry mortar technology, specifically disclosing a solid waste-based thin-layer masonry mortar and its preparation and application methods. This invention contains more than 98 wt% solid waste. The addition of cellulose ether to the solid waste slag powder enhances the activity of various components in the later use of water slag, steel slag, and desulfurized gypsum, increases the viscosity of the system, and improves stability. Through the interaction between the active components in the solid waste slag powder and cement, the cementitious properties of the solid waste-based thin-layer masonry mortar are improved. By limiting the dosage of each raw material, the early hydration rate of the solid waste powder is controlled, and the setting time of the cementitious material system is adjusted. The synergistic effect of each component improves the mechanical strength and stability of the solid waste-based masonry mortar. The solid waste-based thin-layer masonry mortar provided by this invention has good appearance quality, can reduce the mortar joint thickness from 20 mm to 2-4 mm, has excellent performance, greatly reduces costs, and has good industrial prospects and social benefits.

Description

Technical Field

[0001] This invention relates to the field of masonry mortar technology, and in particular to a thin-layer masonry mortar based on solid waste, its preparation method, and its application method. Background Technology

[0002] Masonry mortar refers to the mortar used to lay bricks, stones, blocks, and other block materials into masonry structures. It serves as a bond, lining, and force transfer agent, and is an essential component of masonry. Currently, masonry mortar consists of cement, lime, and fine aggregate. With the rapid development of the construction industry, the consumption of masonry mortar is increasing daily. Statistics show that calcining 1 ton of cement clinker and 1 ton of lime emits approximately 0.78 tons and 1.2 tons of CO2, respectively. This means that using lime or cement as a binder not only consumes large amounts of limestone, clay, and other mineral resources but also results in significant carbon emissions. Natural sand, a major component of fine aggregate in masonry mortar, is also facing a severe shortage, nearing depletion, which is detrimental to ecological protection and sustainable environmental development. Simultaneously, the annual output of industrial waste and tailings in my country is increasing, but its average comprehensive utilization rate is less than 60%, indicating significant room for improvement in the resource utilization of solid waste materials. If solid waste materials such as industrial waste residue and tailings are processed into masonry mortars that can be used in construction projects, the consumption of natural mineral resources such as limestone and natural sand will be greatly reduced, saving costs and reducing carbon emissions. At the same time, it can also open up new avenues for the recycling of solid waste materials.

[0003] There are two obvious problems with the application of solid waste materials to masonry mortar in the existing technology: (1) it is impossible to achieve a low cement content, and the amount of cement used is still large; (2) the mechanical properties of masonry mortar (including water retention, consistency and strength) are low, and quality problems such as cracking and hollowing are easy to occur. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides a solid waste-based thin-layer masonry mortar, its preparation method, and its application method. This mortar not only utilizes industrial solid waste and tailings as resources but also significantly reduces the amount of traditional cement materials used, while exhibiting excellent comprehensive performance.

[0005] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows:

[0006] A thin-layer masonry mortar based on solid waste comprises the following raw material components by mass percentage: 14%–21% solid waste slag powder, 0.5%–1.0% cement, 78%–85% tailings sand, and 0.15%–0.25% water-retaining thickener;

[0007] The solid waste powder comprises the following raw material components by mass percentage: 45%–55% water slag, 30%–40% steel slag, 12%–18% desulfurized gypsum, and 0.1%–0.3% cellulose ether; the water-retaining and thickening agent comprises the following raw material components by mass percentage: 45%–50% cement plasticizer, 30%–35% dispersible latex powder, and 20%–25% starch ether.

[0008] In preliminary experiments, the inventors discovered that thin-layer masonry mortars containing more than 98 wt% solid waste were unlikely to meet the comprehensive performance requirements of cement-based masonry mortars. The inventors experimented with numerous types of solid waste and ultimately selected micronized solid waste powders such as water slag, steel slag, and desulfurized gypsum. Water slag contains the following components by mass percentage: MgO 5%–15%, SiO2 30%–40%, CaO 35%–45%, Al2O3 10%–20%, Fe2O3 0–2%, and SO3 0–3%. The main mineral phases in water slag are tricalcium silicate, dicalcium silicate, calcium magnesium olivine, calcium magnesium rhodochrosite, and calcium aluminoferrite, exhibiting potential hydraulic cementitious properties. Steel slag contains the following components by mass percentage: MgO 0–10%, SiO2 10%–20%, CaO 35%–45%, Al2O3 0–10%, Fe2O3 25%–35%, and SO3 0–1%. Steel slag contains active minerals similar to cement, such as tricalcium silicate, dicalcium silicate, and aluminoferrites, exhibiting hydraulic cementitious properties. The main component of desulfurization gypsum is calcium sulfate dihydrate. Furthermore, through extensive experimentation, the inventors discovered that adding trace amounts of cellulose ether to solid waste slag powder can enhance the activity of various components in the water slag, steel slag, and desulfurization gypsum during later use, increase the viscosity of the system, and improve its stability.

[0009] This invention limits the composition and content of solid waste slag powder. Through the interaction between the active components in the solid waste slag powder and a certain amount of cement, the cementitious performance of thin-layer masonry mortar based on solid waste can be improved, providing a prerequisite for reducing the amount of traditional cement materials used. Desulfurized gypsum and steel slag can initiate hydration reactions. In the early hydration process of the water slag-steel slag-gypsum cementitious material system, water slag, steel slag, and desulfurized gypsum can produce a synergistic effect driven by the formation of ettringite. The main hydration products are ettringite and CSH gel. At the same time, by limiting the amount of each raw material, the early hydration rate of steel slag and the mixture of steel slag and desulfurized gypsum is controlled, and the setting time of the cementitious material system is adjusted.

[0010] Compared to existing technologies, the solid waste-based thin-layer masonry mortar provided by this invention contains more than 98 wt% solid waste, and the water slag is rich in calcium and aluminum elements, which can provide Ca 2+ And Al 3+ Steel slag is rich in calcium, silicon, and divalent metal elements, which can provide divalent metal cations and OH-. - Gypsum can provide calcium2+ and SO4 2- Through hydration, these elements together form extremely insoluble ettringite, driving the hydration reaction forward. Simultaneously, the hydration reaction promotes the depolymerization of silicon-oxygen tetrahedra and aluminum-oxygen octahedra in the slag and steel slag, resulting in a large number of active oxygen tetrahedra in the system. This facilitates the reaction of polymers of monosilicate and polysilicate ions with Ca in the liquid phase. 2+ The combination of these elements forms an increasing amount of CSH cementitious material, which positively impacts the frost resistance and compressive strength of the masonry mortar. The synergistic effect of solid waste powder and cement ensures the water retention, consistency, and strength of the solid waste-based masonry mortar. Tailings sand, as aggregate, guarantees the mechanical strength of the thin-layer masonry mortar on the solid waste base. Specific water-retaining and thickening agents provide good adhesion, ensuring the bond tensile strength between the masonry mortar and the aerated concrete blocks.

[0011] This invention, by limiting the composition and content of each raw material, enables the components to work synergistically and complement each other, thereby improving the mechanical strength (including water retention, consistency, strength, and tensile strength bonded to aerated concrete blocks) and stability of solid waste-based masonry mortar. Furthermore, it can replace traditional cementitious materials such as cement in aerated concrete block masonry mortar, significantly reducing raw material costs and achieving comprehensive utilization of solid waste materials such as industrial waste residue, making it more environmentally friendly. In addition, the solid waste-based thin-layer masonry mortar provided by this invention has excellent appearance quality, can reduce mortar joint thickness from 20mm to 2-4mm, exhibits excellent performance, and has good industrial prospects and social benefits.

[0012] It should be noted that in this invention, the mass percentage of solid waste residue powder and the mass percentage of water-retaining thickener are based on their respective masses.

[0013] Preferably, the cellulose ether is at least one of hydroxyethyl cellulose ether, hydroxyethyl methyl cellulose ether, or hydroxypropyl methyl cellulose ether.

[0014] Preferably, the viscosity coefficient of the cellulose ether is 30,000 mPa·s to 90,000 mPa·s.

[0015] This invention introduces hydroxyethyl, hydroxyethylmethyl, or hydroxypropylmethyl into cellulose molecules using specific cellulose ethers, thereby disrupting the hydrogen bonds between cellulose molecules and the interchain hydrogen bonds. This increases the solubility and dehydration of the system, resulting in good water solubility and significantly improved gelling properties. Through extensive experiments, the inventors discovered that when the viscosity coefficient of the cellulose ether is within the above-mentioned range, the resulting solid waste-based thin-layer masonry mortar exhibits the best overall performance.

[0016] Preferably, the specific surface area of ​​the solid waste slag powder is 500-600 m². 2 / kg.

[0017] Preferably, the quality grade of the desulfurized gypsum is Grade II or above.

[0018] Preferably, the cement is silicate cement with a quality grade of 52.5 or higher.

[0019] Preferably, the tailings sand is 50-200 mesh metal tailings slag.

[0020] More preferably, the metal tailings slag is at least one of lead-zinc tailings slag or iron tailings slag.

[0021] This invention, by further defining the grade and particle size of the aforementioned raw materials, can further leverage the synergistic effect of each material, thereby better improving the overall performance of solid waste-based thin-layer masonry mortar. Through extensive experimentation, the inventors discovered that the specific surface area of ​​solid waste slag powder is 550–600 m². 2 / kg can further improve the overall performance of the obtained solid waste-based thin-layer masonry mortar.

[0022] Preferably, the cement plasticizer is mortar king.

[0023] Preferably, the dispersible latex powder is at least one of the following: vinyl acetate and ethylene copolymer powder (Vac / E), ethylene and vinyl chloride and vinyl silicate terpolymer powder (E / Vc / VL), vinyl acetate and ethylene and higher fatty acid vinyl ester terpolymer powder (Vac / E / VeoVa), vinyl acetate and higher fatty acid vinyl ester copolymer powder (Vac / VeoVa), acrylate and styrene copolymer powder (A / S), vinyl acetate and acrylate and higher fatty acid vinyl ester terpolymer powder (Vac / A / VeoVa), or styrene and butadiene copolymer powder (SBR).

[0024] For example, the specific surface area of ​​the solid waste-based thin-layer masonry mortar is 450–600 m². 2 / kg.

[0025] This invention provides a method for preparing the above-mentioned solid waste-based thin-layer masonry mortar, comprising the following steps:

[0026] S1. Weigh each component according to the design ratio, mix and grind water slag, steel slag, desulfurized gypsum and cellulose ether to obtain solid waste powder.

[0027] S2, Weigh each component according to the design ratio, mix and grind the mortar king, dispersible latex powder and starch ether to obtain water-retaining thickener;

[0028] S3. Weigh each component according to the design ratio, and mix the solid waste residue powder, cement, water-retaining thickener and tailings sand evenly to obtain solid waste-based thin-layer masonry mortar.

[0029] It should be noted that there is no specific order between steps S1 and S2.

[0030] The method for preparing solid waste-based thin-layer masonry mortar provided by this invention employs a mixed grinding process, which can fully utilize the self-grinding effect of high-hardness particles to form a micro-ball milling effect, thereby improving the hydration activity of the solid waste-based thin-layer masonry mortar and reducing grinding energy consumption. Furthermore, the method for preparing solid waste-based thin-layer masonry mortar provided by this invention is simple and easy to implement, and can be applied to large-scale industrial production.

[0031] Preferably, in step S1, a grinding aid of 0.03% to 0.05% of the mass of the solid waste powder needs to be added.

[0032] Preferably, in step S2, a grinding aid of 0.03% to 0.05% by mass of the water-retaining thickener needs to be added.

[0033] For example, the grinding aid is XJ-3 type high-efficiency composite cement grinding aid.

[0034] This invention adds a certain amount of grinding aid during the mixing and grinding process of powder, which can increase the specific surface area of ​​the powder (more than 10%) and the output of the mill (8% to 10%). At the same time, the addition of grinding aid can effectively improve the strength of solid waste cementitious materials at all ages: the 3-day compressive strength is increased by more than 20%, and the 28-day compressive strength is increased by more than 10%.

[0035] The present invention also provides a method for using the above-mentioned solid waste-based thin-layer masonry mortar, comprising the following steps:

[0036] Step a: Mix the thin-layer masonry mortar and water evenly, with a water-to-material ratio of 0.17 to 0.22, to obtain the mortar wet mix.

[0037] Step b: Apply the wet mortar mixture to the brick joint surface. The thickness of the wet mortar mixture coating between the bricks is 2-4 mm, and then carry out the brick masonry construction.

[0038] For example, in step a, the stirring time is 2 to 3 minutes.

[0039] This invention does not have special requirements for specific brick masonry construction, and can be carried out in accordance with the standard GB 50924-2014 "Code for Construction of Masonry Structures".

[0040] The method for using solid waste-based thin-layer masonry mortar provided by this invention enables thin-layer masonry construction through a specific water-to-material ratio. In existing technologies, the mortar joint thickness (i.e., the coating thickness of the wet mortar mixture between masonry sections) is generally 20mm. The solid waste-based thin-layer masonry mortar provided by this invention can improve the smoothness of the masonry surface and reduce the mortar joint thickness to 2-4mm, thus meeting the requirements for brick masonry construction. This significant reduction in mortar joint thickness reduces thermal bridges in the masonry by more than 85%, greatly improving the energy-saving and heat-insulating effect of brick masonry, saving material usage, and reducing project costs. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0042] In this embodiment of the invention, the mortar king used is 1125 mortar king produced by Changsha Yangming Building Materials Co., Ltd., and the grinding aid used is "Baoling" brand XJ-3 type high-efficiency composite cement grinding aid.

[0043] Example 1

[0044] This embodiment provides a thin-layer masonry mortar based on solid waste, composed of the following raw materials by mass percentage: specific surface area of ​​550m² 2 The composition consists of 18% solid waste residue powder per kg, 0.5% 52.5 grade silicate cement, 81.25% 100-mesh lead-zinc tailings slag, and 0.25% water-retaining thickener.

[0045] The solid waste powder is composed of the following raw materials by mass percentage: 50% water slag, 35% steel slag, 14.8% Grade II desulfurization gypsum, and 0.2% hydroxyethyl cellulose ether with a viscosity coefficient of 40,000 mPa·s.

[0046] The water-retaining thickener is composed of the following raw materials by weight percentage: 45% mortar king, 30% olefin and ethylene copolymer powder, and 25% starch ether.

[0047] The preparation method of the above-mentioned solid waste-based thin-layer masonry mortar includes the following steps:

[0048] S1, according to the designed proportions, weigh each component, and mix and grind the water slag, steel slag, desulfurized gypsum, hydroxyethyl cellulose ether, and grinding aid at a mass ratio of 0.04% to obtain a specific surface area of ​​550 m². 2 / kg of solid waste residue powder.

[0049] S2, weigh each component according to the design ratio, mix and grind the mortar king, olefin ester and ethylene copolymer powder and starch ether, and grinding aid with a mass ratio of 0.04% to obtain water-retaining thickener.

[0050] S3. Weigh each component according to the design ratio, and mix the above solid waste slag powder, 52.5 grade silicate cement, the above water-retaining thickener and lead-zinc tailings slag evenly to obtain solid waste-based thin-layer masonry mortar.

[0051] Example 2

[0052] This embodiment provides a thin-layer masonry mortar based on solid waste, composed of the following raw materials by mass percentage: specific surface area of ​​597 m². 2 The composition is 17% solid waste slag powder per kg, 0.75% 52.5 grade silicate cement, 82% 200 mesh iron tailings slag, and 0.25% water-retaining thickener.

[0053] The solid waste powder is composed of the following raw materials by mass percentage: 45% water slag, 40% steel slag, 14.9% Grade II desulfurization gypsum, and 0.1% hydroxyethyl methyl cellulose ether with a viscosity coefficient of 30,000 mPa·s.

[0054] The water-retaining and thickening agent is composed of the following raw materials by weight percentage: 47% mortar king, 31% ethylene, vinyl chloride and vinyl silicate terpolymer powder, and 22% starch ether.

[0055] The preparation method of the above-mentioned solid waste-based thin-layer masonry mortar includes the following steps:

[0056] S1, according to the designed proportions, weigh each component, and mix and grind the water slag, steel slag, desulfurized gypsum, hydroxyethyl methyl cellulose ether, and grinding aid at a mass ratio of 0.03% to obtain a specific surface area of ​​597 m². 2 / kg of solid waste residue powder.

[0057] S2, weigh each component according to the design ratio, mix and grind the mortar king, ethylene and vinyl chloride and vinyl silicate terpolymer powder and starch ether, and grinding aid with a mass ratio of 0.03% to obtain water-retaining thickener.

[0058] S3. Weigh each component according to the design ratio, and mix the above solid waste slag powder, 52.5 grade silicate cement, the above water-retaining thickener and iron tailings slag evenly to obtain solid waste-based thin-layer masonry mortar.

[0059] Example 3

[0060] This embodiment provides a thin-layer masonry mortar based on solid waste, composed of the following raw materials by mass percentage: specific surface area of ​​564 m². 2 The composition includes 14% solid waste residue powder per kg, 0.85% 52.5 grade silicate cement, 85% 50-mesh lead-zinc tailings slag, and 0.15% water-retaining thickener.

[0061] The solid waste powder is composed of the following raw materials by mass percentage: 55% water slag, 32.7% steel slag, 12% Grade II desulfurization gypsum, and 0.3% hydroxypropyl methylcellulose ether with a viscosity coefficient of 60,000 mPa·s.

[0062] The water-retaining and thickening agent is composed of the following raw materials by weight percentage: 50% mortar king, 30% vinyl acetate, ethylene and higher fatty acid vinyl ester terpolymer powder, and 20% starch ether.

[0063] The preparation method of the above-mentioned solid waste-based thin-layer masonry mortar includes the following steps:

[0064] S1, according to the design proportions, weigh each component, and mix and grind the water slag, steel slag, desulfurization gypsum, and hydroxypropyl methylcellulose ether to obtain a specific surface area of ​​564 m². 2 / kg of solid waste residue powder.

[0065] S2, weigh each component according to the design ratio, mix and grind the mortar king, vinyl acetate and ethylene and higher fatty acid vinyl ester terpolymer powder and starch ether to obtain water-retaining thickener.

[0066] S3. Weigh each component according to the design ratio, and mix the above solid waste slag powder, 52.5 grade silicate cement, the above water-retaining thickener and lead-zinc tailings slag evenly to obtain solid waste-based thin-layer masonry mortar.

[0067] Example 4

[0068] This embodiment provides a thin-layer masonry mortar based on solid waste, composed of the following raw materials by mass percentage: specific surface area of ​​560m² 2 The composition includes 20.8% solid waste slag powder per kg, 1.0% grade 52.5 silicate cement, 78% 150-mesh iron tailings slag, and 0.2% water-retaining thickener.

[0069] The solid waste powder is composed of the following raw materials by mass percentage: 51.8% water slag, 30% steel slag, 18% Grade II desulfurization gypsum, and 0.2% hydroxypropyl methylcellulose ether with a viscosity coefficient of 90,000 mPa·s.

[0070] The water-retaining and thickening agent is composed of the following raw materials by weight percentage: 45% mortar king, 35% vinyl acetate and higher fatty acid vinyl ester copolymer powder, and 20% starch ether.

[0071] The preparation method of the above-mentioned solid waste-based thin-layer masonry mortar includes the following steps:

[0072] S1, according to the designed proportions, weigh each component, and mix and grind the water slag, steel slag, desulfurized gypsum, hydroxypropyl methylcellulose ether, and grinding aid at a mass ratio of 0.04% to obtain a specific surface area of ​​560 m². 2 / kg of solid waste residue powder.

[0073] S2, weigh each component according to the design ratio, mix and grind the mortar king, vinyl acetate and high fatty acid vinyl ester copolymer powder and starch ether, and grinding aid with a mass ratio of 0.04% to obtain water-retaining thickener.

[0074] S3. Weigh each component according to the design ratio, and mix the above solid waste slag powder, 52.5 grade silicate cement, the above water-retaining thickener and iron tailings slag evenly to obtain solid waste-based thin-layer masonry mortar.

[0075] Comparative Example 1

[0076] This comparative example provides a thin-layer masonry mortar based on solid waste, similar to Example 1, except that the solid waste slag powder does not contain cellulose ether. The solid waste powder is composed of the following raw materials by mass percentage: 50% water slag, 35% steel slag, and 15% Grade II desulfurization gypsum.

[0077] The preparation method of the above-mentioned solid waste-based thin-layer masonry mortar includes the following steps:

[0078] S1, according to the design ratio, weigh each component, mix and grind the water slag, steel slag, desulfurization gypsum and grinding aid at a mass ratio of 0.04%, to obtain a specific surface area of ​​551 m². 2 / kg of solid waste residue powder.

[0079] S2 to S3 are the same as in Example 1, and will not be described again.

[0080] Comparative Example 2

[0081] This comparative example provides a thin-layer masonry mortar based on solid waste, similar to Example 1, except that in the solid waste slag powder, water slag is replaced with an equal mass of fly ash.

[0082] The preparation method of the above-mentioned solid waste-based thin-layer masonry mortar includes the following steps:

[0083] S1, according to the designed proportions, weigh each component, and mix and grind fly ash, steel slag, desulfurized gypsum, hydroxyethyl cellulose ether, and grinding aid at a mass ratio of 0.04% to obtain a specific surface area of ​​548 m². 2 / kg of solid waste residue powder.

[0084] S2 to S3 are the same as in Example 1, and will not be described again.

[0085] Comparative Example 3

[0086] This comparative example provides a thin-layer masonry mortar based on solid waste, similar to Example 1, except that steel slag is replaced with an equal mass of recycled construction waste powder in the solid waste slag powder.

[0087] The preparation method of the above-mentioned solid waste-based thin-layer masonry mortar includes the following steps:

[0088] S1, according to the design ratio, weigh each component, mix and grind the water slag, recycled construction waste powder, desulfurized gypsum, and hydroxyethyl cellulose ether, along with a grinding aid at a mass ratio of 0.04%, to obtain a specific surface area of ​​589 m². 2 / kg of solid waste residue powder.

[0089] S2 to S3 are the same as in Example 1, and will not be described again.

[0090] Comparative Example 4

[0091] This comparative example provides a thin-layer masonry mortar based on solid waste, similar to Example 1, except that the water-retaining thickener does not contain starch ether. The water-retaining thickener is composed of the following raw materials by mass percentage: 60% mortar king and 40% olefin ester and ethylene copolymer powder.

[0092] The preparation method of the above-mentioned solid waste-based thin-layer masonry mortar includes the following steps:

[0093] S1 is the same as in Example 1, and will not be described again.

[0094] S2, weigh each component according to the design ratio, mix and grind the mortar king, olefin ester and ethylene copolymer powder and grinding aid with a mass ratio of 0.04% to obtain water-retaining thickener.

[0095] S3 is the same as in Example 1, and will not be described again.

[0096] Performance testing

[0097] According to the set water-to-material ratio, several types of solid waste-based thin-layer masonry mortars provided in the examples and comparative examples were mixed with water to form a paste (mixing time was 2 minutes). The performance of the resulting paste-like mortar wet mixture was tested according to standard JC / T 890-2017 "Special Mortar for Autoclaved Aerated Concrete Walls," and the results are shown in Table 1. As can be seen from Table 1, compared to comparative examples 1-5, the solid waste-based thin-layer masonry mortars provided by this invention (examples 1-4) improve the smoothness of the masonry surface, reduce the mortar joint thickness to 2-4 mm, exhibit excellent performance, meet the requirements of brick masonry construction, save material usage, reduce project costs, and have good industrial prospects and social benefits.

[0098] Table 1. Performance of Solid Waste-Based Thin-Layer Masonry Mortar in Examples and Comparative Examples

[0099]

[0100]

[0101] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A thin-layer masonry mortar for solid waste foundations, characterized in that, The raw material components include the following percentages by weight: solid waste slag powder 14%~21%, cement 0.5%~1.0%, tailings sand 78%~85%, and water-retaining thickener 0.15%~0.25%; The solid waste slag powder is composed of the following raw material components by mass percentage: 45%~55% water slag, 30%~40% steel slag, 12%~18% desulfurized gypsum, and 0.1%~0.3% cellulose ether; The water-retaining and thickening agent comprises the following raw material components by mass percentage: 45%~50% cement plasticizer, 30%~35% dispersible latex powder, and 20%~25% starch ether; the cement plasticizer is mortar king; the viscosity of the cellulose ether is 30,000 mPa·s~90,000 mPa·s; The preparation method of the solid waste-based thin-layer masonry mortar includes the following steps: S1. Weigh each component according to the design ratio, mix and grind water slag, steel slag, desulfurized gypsum and cellulose ether to obtain solid waste powder. S2, Weigh each component according to the design ratio, mix and grind the mortar king, dispersible latex powder and starch ether to obtain water-retaining thickener; S3. Weigh each component according to the design ratio, and mix the solid waste residue powder, cement, water-retaining thickener and tailings sand evenly to obtain solid waste-based thin-layer masonry mortar.

2. The thin-layer masonry mortar for solid waste base as described in claim 1, characterized in that, The cellulose ether is at least one of hydroxyethyl cellulose ether, hydroxyethyl methyl cellulose ether, or hydroxypropyl methyl cellulose ether.

3. The thin-layer masonry mortar for solid waste base as described in claim 1, characterized in that, The quality grade of the desulfurized gypsum is Grade II or above; and / or The cement is silicate cement with a quality grade of 52.5 or higher.

4. The thin-layer masonry mortar for solid waste base as described in claim 1, characterized in that, The specific surface area of ​​the solid waste slag powder is 500~600m². 2 / kg; and / or The tailings sand is 50-200 mesh metal tailings slag.

5. The thin-layer masonry mortar for solid waste base as described in claim 4, characterized in that, The metal tailings slag is at least one of lead-zinc tailings slag or iron tailings slag.

6. The thin-layer masonry mortar for solid waste base as described in claim 1, characterized in that, The dispersible latex powder is at least one of the following: vinyl ester and ethylene copolymer powder, ethylene, vinyl chloride and vinyl laurate terpolymer powder, vinyl acetate, ethylene and higher fatty acid vinyl ester terpolymer powder, vinyl acetate and higher fatty acid vinyl ester copolymer powder, acrylate and styrene copolymer powder, vinyl acetate, acrylate and higher fatty acid vinyl ester terpolymer powder, or styrene and butadiene copolymer powder.

7. The method for preparing the solid waste-based thin-layer masonry mortar according to any one of claims 1 to 6, characterized in that, Includes the following steps: S1. Weigh each component according to the design ratio, mix and grind water slag, steel slag, desulfurized gypsum and cellulose ether to obtain solid waste powder. S2, Weigh each component according to the design ratio, mix and grind the mortar king, dispersible latex powder and starch ether to obtain water-retaining thickener; S3. Weigh each component according to the design ratio, and mix the solid waste residue powder, cement, water-retaining thickener and tailings sand evenly to obtain solid waste-based thin-layer masonry mortar.

8. The method for preparing solid waste-based thin-layer masonry mortar as described in claim 7, characterized in that, In step S1, a grinding aid of 0.03% to 0.05% of the mass of the solid waste powder needs to be added; and / or In step S2, grinding aids of 0.03% to 0.05% by mass of the water-retaining thickener need to be added.

9. A method of using the solid waste-based thin-layer masonry mortar according to any one of claims 1 to 6, or the solid waste-based thin-layer masonry mortar prepared by the preparation method of the solid waste-based thin-layer masonry mortar according to any one of claims 7 to 8, characterized in that, Includes the following steps: Step a: Mix the thin-layer masonry mortar and water evenly, with a water-to-material ratio of 0.17 to 0.22, to obtain the mortar wet mixture; Step b: Apply the wet mortar mixture to the brick joint surface. The thickness of the wet mortar mixture coating between the bricks is 2-4 mm, and then carry out the brick masonry construction.

Images