Tailing gravel paste-based self-leveling mortar and preparation method thereof

Abstract

The invention relates to the technical field of self-leveling mortar, in particular to tailing gravel paste-based self-leveling mortar and a preparation method thereof. The tailing sand paste-based self-leveling mortar is prepared from the following raw materials in parts by weight: 60 to 70 parts of tailing sand, 30 to 40 parts of fly ash, 30 to 50 parts of cementing material, 18 to 25 parts of water, 1 to 10 parts of polymer modifier, 0.1 to 1 part of anti-crack fiber, 0.5 to 1.5 parts of binder and 0 to 0.18 part of water-retaining agent. The method is simple to operate, and the tailing sand is efficiently utilized, so that the problem of waste of tailing sand resources is solved.

Description

Technical Field

[0001] The invention relates to the technical field of self-leveling mortar, in particular to a tailings sand gypsum-based self-leveling mortar and a preparation method thereof. Background Art

[0002] Gypsum-based self-leveling mortar has excellent fluidity and self-leveling properties, and can quickly form a flat surface during the construction process. It is suitable for various ground foundations, such as cement floors, tile floors, etc. In addition, it can also improve the wear resistance, pressure resistance and durability of the floor. Gypsum-based self-leveling materials are relatively environmentally friendly. The floor flatness after construction is high, the surface is smooth and delicate, without hollowing, cracking or bubbling, and has good stability. It is less affected by thermal expansion and contraction. Although the material cost of gypsum-based self-leveling is relatively high, due to its high construction efficiency, leveling is completed in one time, and labor costs are relatively low. It currently covers most of the interior decoration and has broad application prospects.

[0003] Traditional gypsum-based self-leveling mortar aggregates are generally sand and gravel, which are more expensive than tailings sand. At present, the contradiction between supply and demand of natural sand and stone in the market is becoming increasingly serious, and the supply and demand problem needs to be solved urgently. A large amount of tailings sand is produced. If it is not effectively utilized or recycled, it will lead to resource waste. It is necessary to design a gypsum-based self-leveling mortar with tailings sand as the main aggregate. Summary of the invention

[0004] In order to solve the problems in the related art, the present invention provides a tailings sand gypsum-based self-leveling mortar and a preparation method thereof. The method is simple to operate and enables the tailings sand to be efficiently utilized, thereby solving the problem of waste of tailings sand resources.

[0005] In order to solve the above problems, the following technical solutions are provided:

[0006] The tailings sand gypsum-based self-leveling mortar of the present invention comprises the following raw materials in parts by weight:

[0007] The weight proportion of tailings sand is 60-70 parts, the weight proportion of fly ash is 30-40 parts, the weight proportion of cementitious material is 30-50 parts, the weight proportion of water is 18-25 parts, the weight proportion of polymer modifier is 1-10 parts, the weight proportion of anti-cracking fiber is 0.1-1 parts, the weight proportion of binder is 0.5-1.5 parts, and the weight proportion of water retaining agent is 0-0.18 parts.

[0008] Through the above scheme, tailings sand is selected as the raw material for preparing gypsum-based self-leveling mortar in the present invention, which provides a favorable way for large-scale utilization of tailings sand, so that tailings sand is efficiently utilized, thereby solving the problem of waste of tailings sand resources. It can not only utilize tailings sand as a resource, but also reduce the harm of untreated tailings sand to the environment, which is beneficial to environmental protection.

[0009] A method for preparing tailings sand gypsum-based self-leveling mortar, characterized in that it comprises the following steps:

[0010] S1: Screen the tailings sand, wash the impurities such as clay and salt therein, crush or crush them, and then sieve them with a 2.51mm sieve so that the particle size of the tailings sand after sieving is less than 2.5mm;

[0011] S2: adding the sieved tailings sand, fly ash and cementitious material into a mixer and stirring evenly to obtain a mixture 1;

[0012] S3: During the stirring process, water is added and the mixer continues to stir to obtain a mixture 2;

[0013] S4: Add polymer modifier, anti-cracking fiber, binder, water retaining agent and water reducing agent to mixture 2, and stir well in a mixer to obtain gypsum-based self-leveling mortar.

[0014] Through the above scheme, the method is adopted to prepare gypsum-based self-leveling mortar, the operation steps are simple, and the gypsum-based self-leveling mortar prepared by adding the above raw materials in a certain order and stirring them evenly has stronger fluidity and lower viscosity than the existing mortar, and can prevent the moisture in the mortar from being lost easily and is more evenly distributed in the system, acting as a water reducer, with more superior performance, making the application prospect of the product broader.

[0015] The cementitious materials are silicate cement and gypsum, and the gypsum is specifically any one or a combination of desulfurized gypsum, phosphogypsum and fluorinated gypsum.

[0016] In the above scheme, the fluidity and strength of the gypsum-based self-leveling mortar can be improved by adding silicate cement, and the addition of gypsum can adjust the setting time of the mortar, making it more flexible during the construction process.

[0017] The tailings sand is any one or a combination of copper tailings sand, iron tailings sand, aluminum tailings sand, and phosphorus tailings sand.

[0018] In the above scheme, by adding tailings sand as aggregate, it is helpful to reduce costs. Tailings sand is solid waste generated in the mining process, which is usually discharged at will, causing serious pollution to the ecological environment. The present invention effectively utilizes tailings sand, reduces pollution to the environment, and also reduces the cost of raw materials.

[0019] The polymer modifier is any one or a combination of polyacrylamide, polystyrene emulsion and polyvinyl alcohol.

[0020] In the above scheme, by adding a polymer modifier, the bonding strength of the gypsum-based self-leveling mortar can be enhanced, the construction performance can be improved, and the crack resistance can be enhanced.

[0021] The anti-cracking fiber is any one or a combination of glass fiber, polypropylene fiber and steel fiber.

[0022] In the above scheme, by adding anti-cracking fibers, the overall strength and toughness of the gypsum-based self-leveling mortar are improved, thereby preventing the generation of cracks and significantly extending the service life of the gypsum-based self-leveling mortar.

[0023] The adhesive is any one or a combination of UV adhesive and epoxy resin gelling agent.

[0024] In the above scheme, the fluidity and plasticity of the gypsum-based self-leveling mortar can be improved by adding a binder, thereby improving the flatness of the ground.

[0025] The water retaining agent is any one or a combination of hydroxypropyl methyl cellulose ether, methyl cellulose ether and hydroxyethyl methyl cellulose ether.

[0026] In the above scheme, by adding a water retaining agent, it is beneficial to enhance the bonding ability and fluidity of the gypsum-based self-leveling mortar, thereby extending the operability time of the gypsum-based self-leveling mortar and improving the construction efficiency.

[0027] The fly ash in S2 is first calcined, the calcination temperature is 1100-1350°C, the calcination time is 0.3-6h, and the insulation time after calcination is 10-90min.

[0028] The stirring temperature in S2~S4 is 10~30℃

[0029] The above solution has the following advantages:

[0030] By adopting the preparation method of the present invention, the operation steps are simple in the process of preparing tailings sand gypsum-based self-leveling mortar. Compared with the existing mortar, the prepared gypsum-based self-leveling mortar has stronger fluidity and lower viscosity. Tailings sand is selected as the raw material for preparing the gypsum-based self-leveling mortar, which provides a favorable way for large-scale utilization of tailings sand, utilizes tailings sand as a resource, reduces pollution to the environment, and also reduces the cost of raw materials. DETAILED DESCRIPTION

[0031] The following will be combined with the specific embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The embodiment of the present application is a tailings sand gypsum-based self-leveling mortar and a preparation method thereof.

[0033] Step 1: Prepare raw materials of different weights

[0034] Example 1: A tailings sand gypsum-based self-leveling mortar, composed of the following raw materials in parts by weight:

[0035] 30 parts of copper tailings, 30 parts of iron tailings, 30 parts of fly ash, 10 parts of Portland cement, 10 parts of phosphogypsum, 10 parts of desulfurized gypsum, 18 parts of water, 1 part of polystyrene emulsion, 0.1 parts of polypropylene fiber, and 0.5 parts of UV adhesive.

[0036] Example 2: A tailings sand gypsum-based self-leveling mortar, composed of the following raw materials in parts by weight:

[0037] 30 parts of copper tailings, 35 parts of iron tailings, 35 parts of fly ash, 15 parts of Portland cement, 15 parts of phosphogypsum, 10 parts of desulfurized gypsum, 20 parts of water, 1 part of polyacrylamide, 0.5 parts of glass fiber, 1 part of epoxy resin gelling agent, and 0.1 part of methyl cellulose ether.

[0038] Embodiment 3: A tailings sand gypsum-based self-leveling mortar, composed of the following raw materials in parts by weight:

[0039] 35 parts of copper tailings, 35 parts of iron tailings, 40 parts of fly ash, 20 parts of Portland cement, 15 parts of phosphogypsum, 15 parts of desulfurized gypsum, 25 parts of water, 10 parts of polyvinyl alcohol, 1 part of steel fiber, 1.5 parts of epoxy resin gelling agent, and 0.18 parts of hydroxypropyl methylcellulose ether.

[0040] Comparative Example 1: A tailings sand gypsum-based self-leveling mortar, composed of the following raw materials in parts by weight:

[0041] 20 parts of copper tailings, 20 parts of iron tailings, 20 parts of fly ash, 10 parts of Portland cement, 5 parts of phosphogypsum, 5 parts of desulfurized gypsum, 10 parts of water, 0.5 parts of polyacrylamide, 0.05 parts of glass fiber, 0.1 parts of epoxy resin gelling agent, and 0.05 parts of methyl cellulose ether.

[0042] Comparative Example 2: A tailings sand gypsum-based self-leveling mortar, composed of the following raw materials in parts by weight:

[0043] 40 parts of copper tailings, 40 parts of iron tailings, 50 parts of fly ash, 30 parts of Portland cement, 20 parts of phosphogypsum, 20 parts of desulfurized gypsum, 30 parts of water, 15 parts of polyacrylamide, 0.5 parts of glass fiber, 2 parts of epoxy resin gelling agent, and 0.5 parts of methyl cellulose ether.

[0044] Comparative Example 1: A sandstone gypsum-based self-leveling mortar, composed of the following raw materials in parts by weight:

[0045] 60 parts of sand and gravel, 35 parts of fly ash, 15 parts of Portland cement, 15 parts of phosphogypsum, 10 parts of desulfurized gypsum, 20 parts of water, 1 part of polyacrylamide, 0.5 parts of glass fiber, 1 part of epoxy resin gelling agent, and 0.1 part of methyl cellulose ether.

[0046] Step 2: A method for preparing tailings sand gypsum-based self-leveling mortar, comprising the following steps:

[0047] S1: Prepare materials: weigh each raw material according to the above formula ratio and set aside;

[0048] S2: The tailings sand is screened and washed to remove impurities such as clay and salt, and then crushed or pulverized, and then sieved with a 2.51 mm sieve to make the particle size of the tailings sand after sieving less than 2.5 mm; the fly ash is calcined at a temperature of 1100 to 1350° C. for 0.3 to 6 hours and the insulation time after calcination is 10 to 90 minutes.

[0049] S3: adding sieved tailings sand, calcined fly ash and cementitious material into a mixer, stirring evenly to obtain a mixture 1, the stirring temperature being 10 to 30° C.;

[0050] S4: During the stirring process, water is added, and the stirrer continues to stir to obtain a mixture 2, and the stirring temperature is 10 to 30° C.;

[0051] S5: Add polymer modifier, anti-cracking fiber, binder, water retaining agent and water reducing agent to mixture 2, stir well in a mixer at a temperature of 10 to 30° C. to obtain gypsum-based self-leveling mortar.

[0052] Step 3: Experimental data

[0053]

[0054] Step 4: Experimental conclusion

[0055] The results show that in Examples 1-3, the raw material ratio is relatively reasonable, ensuring the construction performance index of the self-leveling mortar.

[0056] The slump, plastic deformation, fluidity index and water retention rate of the self-leveling mortar prepared in Examples 1-3 are all high, and the construction performance indicators are good. From the experimental data, the data of Example 3 is the best, and the construction performance indicators of the prepared self-leveling mortar are all excellent.

[0057] In Comparative Example 1, the proportion of cementitious materials such as silicate cement is relatively small, resulting in a decrease in the viscosity of the self-leveling slurry. The low viscosity may cause insufficient fluidity of the self-leveling mortar during construction, affecting the construction quality. In addition, the amount of methyl cellulose ether used is small, which makes the self-leveling mortar prone to water loss during construction, resulting in a decrease in overall fluidity, which may cause cracks or uneven surfaces.

[0058] In Comparative Example 2, the amount of cement is moderate, which effectively maintains the strength of the mortar. However, the amount of fly ash and gypsum is high. Although it can improve the later performance, too high an amount may affect the early strength and fluidity. The use of polyacrylamide and methyl cellulose ether significantly improves the water retention and construction performance of the self-leveling mortar. It is recommended to appropriately increase the amount of methyl cellulose ether to further enhance the water retention and reduce the performance degradation caused by water loss during construction.

[0059] Comparative Example 1 uses conventional sand and gravel as the main material. Compared with Examples 1-3, it does not fully utilize resources such as tailings sand, and is not as good as Examples 1-3 in construction performance.

Claims

1. A tailings sand gypsum-based self-leveling mortar, characterized in that: The invention comprises the following raw materials in parts by weight: 60-70 parts by weight of tailings sand, 30-40 parts by weight of fly ash, 30-50 parts by weight of cementitious material, 18-25 parts by weight of water, 1-10 parts by weight of polymer modifier, 0.1-1 parts by weight of anti-cracking fiber, 0.5-1.5 parts by weight of binder and 0-0.18 parts by weight of water retaining agent.

2. The tailings sand gypsum-based self-leveling mortar according to claim 1, characterized in that: The cementitious materials are silicate cement and gypsum, and the gypsum is specifically any one or a combination of phosphogypsum, desulfurized gypsum and fluorinated gypsum.

3. The tailings sand gypsum-based self-leveling mortar according to claim 1, characterized in that: The tailings sand is any one or a combination of copper tailings sand, iron tailings sand, aluminum tailings sand, and phosphorus tailings sand.

4. The tailings sand gypsum-based self-leveling mortar according to claim 1, characterized in that: The polymer modifier is any one or a combination of polyacrylamide, polystyrene emulsion and polyvinyl alcohol.

5. The tailings sand gypsum-based self-leveling mortar according to claim 1, characterized in that: The anti-cracking fiber is any one or a combination of glass fiber, polypropylene fiber and steel fiber.

6. The tailings sand gypsum-based self-leveling mortar according to claim 1, characterized in that: The adhesive is any one or a combination of UV adhesive and epoxy resin gelling agent.

7. The tailings sand gypsum-based self-leveling mortar according to claim 1, characterized in that: The water retaining agent is any one or a combination of hydroxypropyl methyl cellulose ether, methyl cellulose ether and hydroxyethyl methyl cellulose ether.

8. The method for preparing a tailings sand gypsum-based self-leveling mortar according to claim 1, characterized in that: The following steps are involved: S1: Screen the tailings sand, wash the impurities such as clay and salt therein, crush or crush them, and then sieve them with a 2.51mm sieve so that the particle size of the tailings sand after sieving is less than 2.5mm; S2: adding the sieved tailings sand, fly ash and cementitious material into a mixer and stirring evenly to obtain a mixture 1; S3: During the stirring process, water is added, and the mixer continues to stir to obtain a mixture 2; S4: Add polymer modifier, anti-cracking fiber, binder, water retaining agent and water reducing agent to mixture 2, and stir well in a mixer to obtain gypsum-based self-leveling mortar.

9. The method for preparing a tailings sand gypsum-based self-leveling mortar according to claim 8, characterized in that: The fly ash in S2 is first calcined, the calcination temperature is 1100-1350°C, the calcination time is 0.3-6h, and the insulation time after calcination is 10-90min.

10. The method for preparing a tailings sand gypsum-based self-leveling mortar according to claim 8, characterized in that: The stirring temperature in S2 to S4 is 10 to 30°C.

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