Solid waste-based thin-layer masonry mortar and preparation method and use method therefor

Abstract

A solid waste-based thin-layer masonry mortar and a preparation method and use method therefor. The solid waste-based thin-layer masonry mortar contains 98 wt% or more of solid waste. The addition of a cellulose ether to solid waste residue powder can improve the activity of each component of blast furnace slag, steel slag, and desulfurized gypsum during later use, increase the viscosity of the system, and improve the stability. By means of the interaction between the active components in the solid waste residue powder and cement, the cementitious performance of the solid waste-based thin-layer masonry mortar is improved. By defining the usage amount of each raw material, the early hydration rate of solid waste micropowder is controlled, and the setting time of a cementitious material system is adjusted. The components synergistically work and complement each other to improve the mechanical strength and stability of the solid waste-based masonry mortar. The provided solid waste-based thin-layer masonry mortar has good appearance quality, the thickness of mortar joints can be reduced from 20 mm to 2-4 mm, and excellent use performance and low costs are realized. The solid waste-based thin-layer masonry mortar has good industrial prospects and social benefits.

Description

Solid waste-based thin-layer masonry mortar and preparation method and use method thereof Technical Field

[0001] The present invention relates to the technical field of masonry mortars, and in particular to a solid waste-based thin-layer masonry mortar and a preparation method and a use method thereof. Background Art

[0002] Masonry mortar refers to the mortar used to build masonry structures using materials such as bricks, stones, and blocks. It serves as a bonding, cushioning, and force transfer agent, making it a crucial component of masonry. Currently, masonry mortar is composed of cement, lime, and fine aggregate. With the rapid development of the construction industry, the use of masonry mortar has also increased. Statistics show that the calcination of 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 the use of lime or cement as a binder not only consumes a large amount of mineral resources such as limestone and clay, but also generates significant carbon emissions. Natural sand, a primary component of fine aggregate in masonry mortar, has been significantly reduced or is nearing depletion, posing a threat to ecological protection and sustainable environmental development. Furthermore, my country's annual production of industrial waste slag and tailings is increasing, but the 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 slag and tailings can be processed into masonry slurry that can be used in construction projects, it will greatly reduce the consumption of natural mineral resources such as limestone and natural sand, save costs, reduce carbon emissions, and open up new ways for the recycling of solid waste materials.

[0003] There are two obvious problems in the existing technology when solid waste materials are used in masonry mortar: (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, etc.) are low, and quality problems such as cracking and hollowing are prone to occur. Summary of the Invention

[0004] In response to the above problems, the present invention provides a solid waste-based thin-layer masonry mortar and its preparation method and use method, which not only makes resource utilization of industrial solid waste and tailings, but also greatly reduces the use of traditional cement materials and has good comprehensive performance.

[0005] In order to solve the above technical problems, the technical solution provided by the present invention is:

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

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

[0008] In preliminary experiments, the inventors discovered that thin-layer masonry mortars based on solid waste, comprising more than 98% by weight, struggled to meet the comprehensive performance requirements of cement-based masonry mortars. The inventors experimented with a wide range of solid waste types before ultimately selecting finely divided solid wastes such as slag, steel slag, and desulfurized gypsum. Slag contains the following components by weight: MgO 5%-15%, SiO2 30%-40%, CaO 35%-45%, Al2O3 10%-20%, Fe2O3 0-2%, and SO3 0-3%. The primary mineral phases in slag are tricalcium silicate, dicalcium silicate, olivine, rhodonite, and calcium aluminoferrite, demonstrating its potential for hydraulic cementing. 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 aluminoferrite, and exhibits hydraulic cementing properties. The main component of desulfurized gypsum is calcium sulfate dihydrate. Furthermore, through extensive experiments, the inventors discovered that adding a trace amount of cellulose ether to solid waste slag powder can enhance the activity of the various components of the steel slag, desulfurized gypsum, and steel slag during subsequent use, increasing the viscosity and stability of the system.

[0009] The present invention defines 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 cementing properties of solid waste-based thin-layer masonry mortar can be improved, providing a prerequisite for reducing the amount of traditional cement materials. Desulfurized gypsum and steel slag can stimulate hydration reactions. During the early hydration process of the slag-steel slag-gypsum cementitious material system, the 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 with the prior art, the solid waste-based thin-layer masonry mortar provided by the present invention contains more than 98wt% of 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 Ca 2+ and SO4 2- , they form extremely insoluble ettringite through hydration, which promotes the hydration reaction; at the same time, the hydration reaction promotes the depolymerization of silicon-oxygen tetrahedron and aluminum-oxygen octahedron in water slag and steel slag, so that a large number of active oxygen tetrahedrons appear in the system, which promotes the polymerization of monosilicate ions and polysilicate ions with Ca in the liquid phase. 2+ The combination of solid waste powder and cement creates a growing amount of CSH gel, which has a positive impact on the frost resistance and compressive strength of the masonry mortar. The synergistic effect of solid waste micropowder and cement ensures the water retention, consistency, and strength of the solid waste-based masonry mortar. Tailings sand as an aggregate ensures the mechanical strength of the solid waste-based thin-layer masonry mortar. Specific water-retention thickeners provide good adhesion, ensuring the tensile strength of the bond between the masonry mortar and aerated bricks.

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

[0012] It should be noted that, in the present invention, the mass percentage of the solid waste residue powder and the mass percentage of the 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] The present invention introduces hydroxyethyl, hydroxyethylmethyl or hydroxypropylmethyl groups into cellulose molecules through specific cellulose ethers, thereby destroying the hydrogen bonds between cellulose molecules and interchain hydrogen bonds, thereby increasing the solubility and dehydration effect of the system, making the system exhibit good water solubility and significantly improving the gelling properties. The inventors found through a large number of experiments that when the viscosity coefficient of the cellulose ether is within the above range, the comprehensive performance of the resulting solid waste-based thin-layer masonry mortar is optimal.

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

[0017] Preferably, the quality grade of the desulfurization gypsum is above grade II, and the quality grade of the desulfurization gypsum is certified by GB / T 37785-2019 "Flue Gas Desulfurization Gypsum".

[0018] Preferably, the cement is silicate cement with a quality grade of 52.5 or above, and the quality grade of the cement is certified by GB 175-2023 "General Purpose Portland Cement".

[0019] Preferably, the tailings sand is metal tailings slag with a mesh size of 50 to 200.

[0020] Further preferably, the metal tailings are at least one of lead-zinc tailings or iron tailings.

[0021] By further limiting the grade and particle size of the above raw materials, the present invention can further exert the synergistic effect of each raw material and better improve the comprehensive performance of solid waste-based thin-layer masonry mortar. The inventor found through a large number of experiments that the specific surface area of ​​solid waste slag powder is 550-600m 2 / kg can further improve the comprehensive 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 olefin ester and ethylene copolymer rubber powder (Vac / E), ethylene, vinyl chloride and vinyl silicate ternary copolymer rubber powder (E / Vc / VL), vinyl acetate, ethylene and higher fatty acid vinyl ester ternary copolymer rubber powder (Vac / E / VeoVa), vinyl acetate and higher fatty acid vinyl ester copolymer rubber powder (Vac / VeoVa), acrylate and styrene copolymer rubber powder (A / S), vinyl acetate, acrylate and higher fatty acid vinyl ester ternary copolymer rubber powder (Vac / A / VeoVa) or styrene and butadiene copolymer rubber powder (SBR).

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

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

[0026] S1, weighing each component according to the designed ratio, mixing and grinding water slag, steel slag, desulfurized gypsum and cellulose ether to obtain solid waste powder;

[0027] S2, weighing each component according to the designed ratio, mixing and grinding the mortar king, dispersible latex powder and starch ether to obtain a water-retaining thickener;

[0028] S3, weighing each component according to the designed ratio, and evenly mixing the solid waste slag powder, cement, the water-retaining thickener and tailings sand to obtain solid waste-based thin-layer masonry mortar.

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

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

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

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

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

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

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

[0036] Step a, mixing the solid waste base thin layer masonry mortar and water evenly with a water-to-material ratio of 0.17 to 0.22 to obtain a mortar mixing wet material;

[0037] Step b: coating the wet mortar mixture on the brick connection surface, with the coating thickness of the wet mortar mixture between the brickwork being 2 to 4 mm, and then carrying out brickwork construction.

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

[0039] The present invention has no special requirements for specific brickwork construction, and construction can be carried out with reference to the standard GB 50924-2014 "Code for Construction of Masonry Structure Engineering".

[0040] The method for using the solid waste-based thin-layer masonry mortar provided by the present invention can realize thin-layer masonry construction through a specific water-to-material ratio. In the prior art, the mortar joint thickness (i.e., the coating thickness of the masonry mortar mixed with wet materials between masonry bodies) is generally 20 mm. The solid waste-based thin-layer masonry mortar provided by the present invention can improve the flatness of the masonry surface and reduce the mortar joint thickness to 2 to 4 mm, which can meet the requirements of brickwork construction. The significant reduction in mortar joint thickness reduces thermal bridges in masonry by more than 85%, greatly improves the energy-saving and thermal insulation effect of brickwork, saves material usage, and reduces project costs. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0042] The mortar king used in the embodiment of the present invention 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 solid waste-based thin-layer masonry mortar, which is composed of the following raw materials in percentage by mass: a specific surface area of ​​550m 2 / kg solid waste slag powder 18%, 52.5 grade silicate cement 0.5%, 100 mesh lead-zinc tailings 81.25% and water-retaining thickener 0.25%.

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

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

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

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

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

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

[0051] Example 2

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

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

[0054] The water-retaining thickener is composed of the following raw materials in percentage by mass: 47% of mortar king, 31% of ethylene, vinyl chloride and vinyl silicate ternary copolymer rubber powder and 22% of starch ether.

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

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

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

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

[0059] Example 3

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

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

[0062] The water-retaining thickener is composed of the following raw materials in percentage by mass: 50% of mortar king, 30% of ternary copolymer rubber powder of vinyl acetate, ethylene and higher fatty acid vinyl ester and 20% of starch ether.

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

[0064] S1, weigh each component according to the designed ratio, mix and grind the water slag, steel slag, desulfurized gypsum and hydroxypropyl methyl cellulose ether to obtain a specific surface area of ​​564m 2 / kg of solid waste powder.

[0065] S2. Weigh each component according to the designed ratio, mix and grind the mortar king, vinyl acetate and ethylene and higher fatty acid vinyl ester ternary copolymer rubber powder and starch ether to obtain a water-retaining thickener.

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

[0067] Example 4

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

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

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

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

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

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

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

[0075] Comparative Example 1

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

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

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

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

[0080] Comparative Example 2

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

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

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

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

[0085] Comparative Example 3

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

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

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

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

[0090] Comparative Example 4

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

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

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

[0094] S2. Weigh each component according to the designed ratio, mix and grind the mortar king, vinyl ester and ethylene copolymer rubber powder and 0.04% by weight of a grinding aid to obtain a water-retaining thickener.

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

[0096] Performance Testing

[0097] According to the set water-to-material ratio, several solid waste-based thin-layer masonry mortars provided in the Examples and Comparative Examples were added with water and stirred until they were paste-like (stirring time was 2 minutes). The performance of the resulting paste-like mortar mix was tested with reference to the standard JC / T 890-2017 "Special Mortar for Autoclaved Aerated Concrete Walls". The results are shown in Table 1. As can be seen from Table 1, compared with Comparative Examples 1 to 5, the solid waste-based thin-layer masonry mortars provided by the present invention (Examples 1 to 4) improved the smoothness of the masonry surface and could reduce the mortar joint thickness to 2 to 4 mm. They have excellent performance, can meet the requirements of brickwork 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 mortars in Examples and Comparative Examples

[0099] 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 in the scope of protection of the present invention.

Claims

1. A solid waste-based thin-layer masonry mortar, characterized in that: The raw material components include the following mass percentages: 14% to 21% of solid waste slag powder, 0.5% to 1.0% of cement, 78% to 85% of tailings sand and 0.15% to 0.25% of water-retaining thickener; The solid waste powder comprises the following raw material components in percentage by mass: 45% to 55% of water slag, 30% to 40% of steel slag, 12% to 18% of desulfurized gypsum and 0.1% to 0.3% of cellulose ether; The water-retaining thickener comprises the following raw material components in percentage by mass: 45% to 50% of cement plasticizer, 30% to 35% of dispersible latex powder and 20% to 25% of starch ether.

2. The solid waste-based thin-layer masonry mortar according to 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 solid waste-based thin-layer masonry mortar according to claim 1 or 2, characterized in that: The viscosity coefficient of the cellulose ether is 30,000 mPa·s to 90,000 mPa·s.

4. The solid waste-based thin-layer masonry mortar according to claim 1, characterized in that: The quality grade of the desulfurized gypsum is above grade II; and / or The cement is silicate cement with a quality grade of 52.5 or above.

5. The solid waste-based thin-layer masonry mortar according to claim 1, characterized in that: The specific surface area of ​​the solid waste slag powder is 500-600m 2 / kg; and / or The tailings sand is metal tailings slag with a mesh size of 50 to 200.

6. The solid waste-based thin-layer masonry mortar according to claim 5, characterized in that: The metal tailings are at least one of lead-zinc tailings or iron tailings.

7. The solid waste-based thin-layer masonry mortar according to claim 1, characterized in that: The cement plasticizer is mortar king; and / or The dispersible latex powder is at least one of ethylene ester copolymer rubber powder, ethylene and vinyl chloride and vinyl silicate ternary copolymer rubber powder, vinyl acetate and ethylene and higher fatty acid vinyl ester ternary copolymer rubber powder, vinyl acetate and higher fatty acid vinyl ester copolymer rubber powder, acrylate and styrene copolymer rubber powder, vinyl acetate and acrylate and higher fatty acid vinyl ester ternary copolymer rubber powder or styrene and butadiene copolymer rubber powder.

8. The method for preparing the solid waste-based thin-layer masonry mortar according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, weighing each component according to the designed ratio, mixing and grinding water slag, steel slag, desulfurized gypsum and cellulose ether to obtain solid waste slag powder; S2, weighing each component according to the designed ratio, mixing and grinding the mortar king, dispersible latex powder and starch ether to obtain a water-retaining thickener; S3, weighing each component according to the designed ratio, and evenly mixing the solid waste slag powder, cement, the water-retaining thickener and tailings sand to obtain a solid waste-based thin-layer masonry mortar.

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

10. A method for using the solid waste-based thin-layer masonry mortar according to any one of claims 1 to 7 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 8 to 9, characterized in that: The following steps are involved: Step a, mixing the solid waste base thin layer masonry mortar and water evenly, with a water-to-material ratio of 0.17 to 0.22, to obtain a mortar mixing wet material; Step b, coating the wet mortar mixture on the brick connection surface, the coating thickness of the wet mortar mixture between the brickwork is 2 to 4 mm, and brickwork construction is carried out.

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