Solid waste-based self-leveling mortar and preparation method therefor

Abstract

The present invention relates to a solid waste-based self-leveling mortar, comprising the following components by parts by weight: 197-217 parts of granulated blast furnace slag powder, 151-171 parts of steel slag powder, 105-125 parts of industrial by-product gypsum powder, 390-410 parts of iron tailings sand, 90-110 parts of steel slag sand, 10-30 parts of aluminate cement, 1.5-3.5 parts of a high-performance water reducer, 10-30 parts of rubber powder, 1.5-3.5 parts of calcium formate, 1.5-3.5 parts of a defoamer, and 0.2-0.4 part of cellulose. The present invention entirely uses the industrial solid waste materials as raw materials and makes full use of industrial solid waste, thereby saving energy, realizing environment protection, and involving low production costs. In addition, the solid waste-based self-leveling mortar has good fluidity, can be spread evenly, and can flow well into gaps of floor heating pipes; and after hardening, the self-leveling mortar is evenly distributed and has good anti-segregation ability.

Description

A solid waste-based self-leveling mortar and its preparation method Technical Field

[0001] This invention relates to the field of building materials technology applications, and in particular to a solid waste-based self-leveling mortar and its preparation method. Background Technology

[0002] With the continuous advancement of construction technology, self-leveling mortar has experienced rapid development due to its superior performance. The application of industrial solid waste in self-leveling mortar can improve its performance, reduce costs, and decrease resource and energy consumption, aligning with the requirements of a low-carbon and environmentally friendly era. In recent years, my country has achieved certain results in the research and application of solid waste in self-leveling mortar.

[0003] Self-leveling materials, as an ideal new material and technology for floor construction, are highly favored by the market due to their excellent performance and simple and quick construction methods, and have a very broad application prospect. Traditional self-leveling mortars are expensive, limiting their widespread application. Applying industrial solid waste to self-leveling mortars can not only reduce costs but also improve the performance of the mortar by utilizing certain properties of industrial solid waste (such as wear resistance and expansion properties). More importantly, it can save resources and achieve resource recycling.

[0004] CN202211576850 relates to a cement-based sand-free self-leveling flooring material prepared using waste powder and its preparation process. The waste powder is generated during the preparation of aggregates from natural stone or recycled aggregates from construction waste. To date, none of the numerous patents related to self-leveling mortar have addressed the complete replacement of raw materials with industrial solid waste materials in the production of self-leveling mortar. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a solid waste-based self-leveling mortar and its preparation method. The application of industrial solid waste to self-leveling mortar can not only reduce costs, but also improve the performance of self-leveling mortar by utilizing the wear resistance and expansion properties of industrial solid waste. More importantly, it can save resources and realize resource recycling.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] A self-leveling mortar based on solid waste comprises, by weight: 197-217 parts granulated blast furnace slag powder, 151-171 parts steel slag powder, 105-125 parts industrial by-product gypsum powder, 390-410 parts iron tailings sand, 90-110 parts steel slag sand, 10-30 parts aluminate cement, 1.5-3.5 parts high-performance water-reducing agent, 10-30 parts adhesive powder, 1.5-3.5 parts calcium formate, 1.5-3.5 parts defoamer, and 0.2-0.4 parts cellulose.

[0008] The granulated blast furnace slag powder is S95 grade granulated blast furnace slag powder.

[0009] The steel slag powder is grade one steel slag powder.

[0010] The industrial by-product gypsum powder is industrial by-product gypsum with a fineness of ≤1.0% residue on a 0.080mm square hole sieve.

[0011] The bulk density of the iron tailings sand is 1700 kg / cubic meter, and the fineness modulus is 2.45.

[0012] The steel slag sand is fine sand with a fineness modulus of 1.6-2.2.

[0013] The high-performance water-reducing agent is a powdered polycarboxylate-based high-performance water-reducing agent.

[0014] The adhesive powder is a copolymer of ethylene and vinyl acetate.

[0015] The defoamer is an organosilicon-based concrete defoamer.

[0016] The cellulose is hydroxypropyl methylcellulose.

[0017] A method for preparing solid waste-based self-leveling mortar includes the following steps:

[0018] 1) Granulated blast furnace slag powder, steel slag powder, and industrial by-product gypsum powder are mixed in proportion to obtain GC42.5 grade solid waste-based cementitious material;

[0019] 2) Aluminate cement, high-performance water-reducing agent, adhesive powder, calcium formate, defoamer, and cellulose are mixed in proportion to obtain a composite functional additive.

[0020] 3) Add the above two materials, iron tailings sand, and steel slag sand into a rotating mixer and mix for 3-5 minutes to obtain a solid waste-based self-leveling mortar dry mix with uniform color.

[0021] Compared with existing technologies, the beneficial effects of this invention are:

[0022] 1. It uses industrial solid waste materials as raw materials, making full use of industrial solid waste, saving energy and protecting the environment, and reducing production costs.

[0023] 2. It has excellent fluidity, spreads evenly, and can flow well into the gaps of underfloor heating pipes.

[0024] 3. The hardened self-leveling mortar is evenly distributed and has excellent anti-segregation ability.

[0025] 4. The dense structure of self-leveling mortar facilitates the uniform upward conduction of heat, ensuring a good thermal effect.

[0026] 5. High strength, fast hardening, extremely low shrinkage, not easy to crack, not easy to delaminate or delaminate.

[0027] This invention uses industrial solid waste as the main raw material, and the product has excellent performance. It is a green, environmentally friendly, and low-carbon material. Detailed Implementation

[0028] It should be noted that, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0029] A self-leveling mortar based on solid waste comprises, by weight: 197-217 parts granulated blast furnace slag powder, 151-171 parts steel slag powder, 105-125 parts industrial by-product gypsum powder, 390-410 parts iron tailings sand, 90-110 parts steel slag sand, 10-30 parts aluminate cement, 1.5-3.5 parts high-performance water-reducing agent, 10-30 parts adhesive powder, 1.5-3.5 parts calcium formate, 1.5-3.5 parts defoamer, and 0.2-0.4 parts cellulose.

[0030] The granulated blast furnace slag powder is S95 grade granulated blast furnace slag powder.

[0031] The steel slag powder is grade one steel slag powder.

[0032] The industrial by-product gypsum powder is industrial by-product gypsum with a fineness of ≤1.0% residue on a 0.080mm square hole sieve.

[0033] The bulk density of the iron tailings sand is 1700 kg / cubic meter, and the fineness modulus is 2.45.

[0034] The steel slag sand is fine sand with a fineness modulus of 1.6-2.2.

[0035] The high-performance water-reducing agent is a powdered polycarboxylate-based high-performance water-reducing agent.

[0036] The adhesive powder is a copolymer of ethylene and vinyl acetate.

[0037] The defoamer is an organosilicon-based concrete defoamer.

[0038] The cellulose is hydroxypropyl methylcellulose.

[0039] A method for preparing solid waste-based self-leveling mortar includes the following steps:

[0040] 1) Granulated blast furnace slag powder, steel slag powder, and industrial by-product gypsum powder are mixed in proportion to obtain GC42.5 grade solid waste-based cementitious material;

[0041] 2) Aluminate cement, high-performance water-reducing agent, adhesive powder, calcium formate, defoamer, and cellulose are mixed in proportion to obtain a composite functional additive with water-reducing, early-strength, plasticizing, fluidizing, and thickening functions.

[0042] 3) Add the above two materials, iron tailings sand, and steel slag sand into a rotating mixer and mix for 3-5 minutes to obtain a solid waste-based self-leveling mortar dry mix with uniform color.

[0043] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0044] Example 1:

[0045] A method for preparing solid waste-based self-leveling mortar includes:

[0046] 1. By weight, 207 parts of granulated blast furnace slag powder (S95 grade granulated blast furnace slag powder, whose indicators meet the requirements of GB / T18046-2017), 161 parts of steel slag powder (meeting the first grade steel slag powder in GB / T20491-2017 "Steel Slag Powder for Cement and Concrete") and 115 parts of industrial by-product gypsum powder (meeting the industrial by-product gypsum with a fineness of ≤1.0% on a 0.080mm square hole sieve in GB / T21371-2019 "Industrial By-product Gypsum for Cement") are mixed and stirred to obtain GC42.5 grade solid waste-based cementitious material (evaluated according to T / CECS10400-2024 "Solid Waste-based Cementitious Materials"); all three raw materials are metallurgical industrial solid waste.

[0047] 2. Mix 20 parts of aluminate cement (A600 type), 2.5 parts of high-performance water-reducing agent (powdered polycarboxylate-based high-performance water-reducing agent produced by Shenyang Shengxinyuan Admixture Co., Ltd.), 20 parts of adhesive powder (redispersible latex powder), 2.5 parts of calcium formate, 2.5 parts of defoamer (D508 type organosilicon concrete defoamer), and 0.3 parts of cellulose (hydroxypropyl methylcellulose HPMC-400 distributed by Guangdong Longhu Technology Co., Ltd.) to obtain a composite multifunctional additive.

[0048] 3. Add the above two materials, along with 400 parts of iron tailings sand (tailings produced by Anshan Iron and Steel Group Co., Ltd., with a bulk density of 1700 kg / m³ and a fineness modulus of 2.45) and 100 parts of steel slag sand (fine sand conforming to the "Steel Slag Sand for Ordinary Premixed Mortar" standard YB / T4201-2009, with a fineness modulus of 1.6-2.2), into a rotating mixer and mix for 3-5 minutes to obtain a uniformly colored solid waste-based self-leveling mortar dry mix. The iron tailings sand is tailings produced by Anshan Iron and Steel Group Co., Ltd., and the steel slag sand is tailings from steelmaking. Both materials are solid waste from the metallurgical industry.

[0049] The properties of the above-mentioned solid waste-based self-leveling mortar dry mix are shown in Table 1:

[0050] Example 2:

[0051] A method for preparing solid waste-based self-leveling mortar includes:

[0052] 1. By weight, 200 parts of granulated blast furnace slag powder (S95 grade granulated blast furnace slag powder, whose indicators meet the requirements of GB / T18046-2017), 170 parts of steel slag powder (meeting the first grade steel slag powder in GB / T20491-2017 "Steel Slag Powder for Cement and Concrete") and 120 parts of industrial by-product gypsum powder (meeting the industrial by-product gypsum with a fineness of ≤1.0% on a 0.080mm square hole sieve in GB / T21371-2019 "Industrial By-product Gypsum for Cement") are mixed and stirred to obtain GC42.5 grade solid waste-based cementitious material; all three raw materials are metallurgical industrial solid waste.

[0053] 2. Mix 15 parts of aluminate cement (A600 type), 2.5 parts of high-performance water-reducing agent (powdered polycarboxylate-based high-performance water-reducing agent produced by Shenyang Shengxinyuan Admixture Co., Ltd.), 25 parts of adhesive powder (redispersible latex powder), 3 parts of calcium formate, 1.8 parts of defoamer (D508 type organosilicon concrete defoamer), and 0.35 parts of cellulose (hydroxypropyl methylcellulose HPMC-400 distributed by Guangdong Longhu Technology Co., Ltd.) to obtain a composite multifunctional additive.

[0054] 3. Add the above two materials, 405 parts of iron tailings sand (tailings produced by Anshan Iron and Steel Coal Mine, with a bulk density of 1700 kg / m³ and a fineness modulus of 2.45), and 105 parts of steel slag sand (fine sand conforming to the "Steel Slag Sand for Ordinary Premixed Mortar" YB / T4201-2009, with a fineness modulus of 1.6-2.2) into a rotating mixer and mix for 3-5 minutes to obtain a solid waste-based self-leveling mortar dry mix with a uniform color.

[0055] The properties of the above-mentioned solid waste-based self-leveling mortar dry mix are shown in Table 2:

[0056] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A solid waste-based self-leveling mortar, characterized in that, Its components, by weight, include: 197-217 parts granulated blast furnace slag powder, 151-171 parts steel slag powder, 105-125 parts industrial by-product gypsum powder, 390-410 parts iron tailings sand, 90-110 parts steel slag sand, 10-30 parts aluminate cement, 1.5-3.5 parts high-performance water-reducing agent, 10-30 parts adhesive powder, 1.5-3.5 parts calcium formate, 1.5-3.5 parts defoamer, and 0.2-0.4 parts cellulose.

2. The solid waste-based self-leveling mortar according to claim 1, characterized in that, The granulated blast furnace slag powder is S95 grade granulated blast furnace slag powder.

3. The solid waste-based self-leveling mortar according to claim 1, characterized in that, The steel slag powder is grade one steel slag powder.

4. The solid waste-based self-leveling mortar according to claim 1, characterized in that, The industrial by-product gypsum powder is industrial by-product gypsum with a fineness of ≤1.0% residue on a 0.080mm square hole sieve.

5. The solid waste-based self-leveling mortar according to claim 1, characterized in that, The bulk density of the iron tailings sand is 1700 kg / cubic meter, and the fineness modulus is 2.

45.

6. The solid waste-based self-leveling mortar according to claim 1, characterized in that, The steel slag sand is fine sand with a fineness modulus of 1.6-2.

2.

7. The solid waste-based self-leveling mortar according to claim 1, characterized in that, The high-performance water-reducing agent is a powdered polycarboxylate-based high-performance water-reducing agent.

8. The solid waste-based self-leveling mortar according to claim 1, characterized in that, The adhesive powder is a copolymer of ethylene and vinyl acetate.

9. The solid waste-based self-leveling mortar according to claim 1, characterized in that, The defoamer is an organosilicon-based concrete defoamer.

10. The method for preparing solid waste-based self-leveling mortar according to claim 1, characterized in that, Includes the following steps: 1) Granulated blast furnace slag powder, steel slag powder, and industrial by-product gypsum powder are mixed in proportion to obtain GC42.5 grade solid waste-based cementitious material; 2) Aluminate cement, high-performance water-reducing agent, adhesive powder, calcium formate, defoamer, and cellulose are mixed in proportion to obtain a composite functional additive. 3) Add the above two materials, iron tailings sand, and steel slag sand into a rotating mixer and mix for 3-5 minutes to obtain a solid waste-based self-leveling mortar dry mix with uniform color.

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