Modified basalt fiber reinforced self-leveling mortar and preparation method thereof

Abstract

The application discloses a modified basalt fiber reinforced self-leveling mortar and a preparation method thereof, and relates to the technical field of cement mortar. The modified basalt fiber reinforced self-leveling mortar comprises the following raw materials in parts by weight: 18-22 parts of ordinary Portland cement, 6-10 parts of fast-hardening sulphoaluminate cement, 4-8 parts of gypsum, 35-45 parts of quartz sand, 15-20 parts of calcium carbonate, 0.5-1 part of modified basalt fiber, 2-4 parts of redispersible latex powder, 0.05-0.1 part of cellulose ether, 0.05-0.2 part of defoaming agent, 0.1-0.2 part of retarder and 0.1-0.3 part of water reducing agent. The modified basalt fiber reinforced self-leveling mortar prepared by the application has excellent fluidity, fluidity retention rate, tensile bonding strength, 28d compressive strength, 28d flexural strength and dimensional stability.

Description

Technical Field

[0001] This invention relates to the field of cement mortar technology, specifically to a modified basalt fiber reinforced self-leveling mortar and its preparation method. Background Technology

[0002] Self-leveling mortar is a thin-layer material with high fluidity that automatically levels itself under its own weight. It is widely used in floor decoration, leveling, underfloor heating backfilling, and tile / flooring substrate treatment. Compared with traditional cement mortar, it offers higher construction efficiency, better flatness, and lower labor intensity, making it particularly suitable for modern rapid building renovations and underfloor heating systems. However, traditional self-leveling mortar still suffers from insufficient mechanical properties and weak durability. Basalt fiber (BF), due to its high weather resistance and mechanical strength, has begun to be widely studied as a reinforcing material. However, BF has weak interfacial bonding with cement hydration products, easily forming a loose and weak layer in the interfacial transition zone. This significantly hinders the effective transfer of stress from the matrix to the fiber, making it difficult to fully realize the fiber reinforcement and toughening effect.

[0003] Chinese invention patent CN113213861A discloses a cement-based self-leveling mortar and its preparation process. The cement-based self-leveling mortar includes 200-300 parts of cement, 20-60 parts of gypsum, 50-100 parts of sulfoaluminate cement, 0.5-1.5 parts of cellulose, 0.8-2.0 parts of water-reducing agent, 0.5-1.0 parts of defoamer, 0.2-0.5 parts of accelerator, 0.5-1.2 parts of retarder, 400-600 parts of graded sand, 130-180 parts of filler, 30-50 parts of epoxy resin, and 20-50 parts of soybean flour. The cement-based self-leveling mortar prepared by this application has the advantages of good wear resistance and low dust generation, but its compressive strength needs to be improved. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a modified basalt fiber reinforced self-leveling mortar and its preparation method.

[0005] A modified basalt fiber reinforced self-leveling mortar comprises the following raw materials in parts by weight: 18-22 parts ordinary silicate cement, 6-10 parts rapid-hardening sulfoaluminate cement, 4-8 parts gypsum, 35-45 parts quartz sand, 15-20 parts calcium carbonate, 0.5-1 part modified basalt fiber, 2-4 parts redispersible latex powder, 0.05-0.1 parts cellulose ether, 0.05-0.2 parts defoamer, 0.1-0.2 parts retarder, and 0.1-0.3 parts water-reducing agent; The modified basalt fiber is prepared by the following method: S1: Mix the ethanol solution and silane coupling agent thoroughly, adjust the pH to 3-5, add basalt fiber, heat and stir, then filter, wash and dry to obtain the precursor. S2: Mix deionized water, precursor, and calcium nitrate tetrahydrate, adjust the pH to 11-12 with alkaline solution, add aluminum sulfate octadecahydrate dropwise while maintaining the pH during the dropwise addition, age at room temperature, and obtain modified basalt fiber after filtration, washing, and drying.

[0006] The redispersible latex powder is one of the following: ethylene, vinyl acetate and ethylene tert-carbonate terpolymer powder, and ethylene and vinyl acetate copolymer powder.

[0007] The cellulose ether is hydroxypropyl methylcellulose ether.

[0008] The defoamer is a modified polyether-based high-efficiency powder defoamer, model P805.

[0009] The retarder is one of citric acid and tartaric acid.

[0010] The water-reducing agent is a polycarboxylate water-reducing agent.

[0011] In step S1, the mass ratio of the silane coupling agent to the basalt fiber is (5-8):100.

[0012] In step S1, the silane coupling agent is γ-aminoethylaminopropyltrimethoxysilane.

[0013] In step S2, the mass ratio of the precursor, calcium nitrate tetrahydrate, and aluminum sulfate octadecahydrate is 100:(25-35):(12-18).

[0014] A method for preparing modified basalt fiber reinforced self-leveling mortar includes the following steps: (1) Weigh out the following by weight: 18-22 parts of ordinary silicate cement, 6-10 parts of rapid-hardening sulfoaluminate cement, 4-8 parts of gypsum, 35-45 parts of quartz sand, 15-20 parts of calcium carbonate, 0.5-1 parts of modified basalt fiber, 2-4 parts of redispersible latex powder, 0.05-0.1 parts of cellulose ether, 0.05-0.2 parts of defoamer, 0.1-0.2 parts of retarder, and 0.1-0.3 parts of water-reducing agent; (2) Mix ordinary silicate cement, rapid hardening sulfoaluminate cement, gypsum, quartz sand, calcium carbonate, modified basalt fiber, redispersible latex powder, cellulose ether, defoamer, retarder and water-reducing agent to obtain modified basalt fiber reinforced self-leveling mortar.

[0015] Due to the adoption of the above technical solutions, the beneficial effects of the present invention include: The modified basalt fiber reinforced self-leveling mortar prepared by this invention has excellent flowability and flowability retention rate, tensile bond strength, 28-day compressive strength, 28-day flexural strength and dimensional stability. Attached Figure Description

[0016] Figure 1 Scanning electron microscope image of the modified basalt fiber prepared in Example 2.

[0017] Figure 2 Fourier transform infrared spectrum of the modified basalt fiber prepared in Example 2. Detailed Implementation

[0018] Example 1: Preparation of modified basalt fiber S1: Mix 200 mL of 90 wt% ethanol solution and 5 g of γ-aminoethylaminopropyltrimethoxysilane, adjust the pH to 5 with 5 wt% hydrochloric acid solution, stir for 20 min, add 100 g of basalt fiber, heat to 50 ℃ and stir for 6 h, cool to room temperature, filter, wash with 70 wt% ethanol solution (2 × 100 mL), and vacuum dry at 100 ℃ for 5 h to obtain the precursor; S2: Mix 800 mL of deionized water, 100 g of precursor, and 25 g of calcium nitrate tetrahydrate. Adjust the pH to 11 using 5 wt% sodium hydroxide solution. Add 100 mL of deionized water containing 12 g of aluminum sulfate octadecahydrate at a rate of 1 mL / min. During the addition, maintain the pH at 11 ± 0.5 using 5 wt% sodium hydroxide solution. Aging at 40 °C for 6 h, filter, wash with deionized water until neutral, and vacuum dry at 50 °C for 12 h to obtain modified basalt fibers with surface-deposited hydrated calcium sulfoaluminate.

[0019] Example 2 Preparation of modified basalt fiber S1: Mix 200 mL of 90 wt% ethanol solution and 7 g of γ-aminoethylaminopropyltrimethoxysilane, adjust the pH to 4 with 5 wt% hydrochloric acid solution, stir for 20 min, add 100 g of basalt fiber, heat to 55 ℃ and stir for 5.5 h, cool to room temperature, filter, wash with 70 wt% ethanol solution (2 × 100 mL), and vacuum dry at 100 ℃ for 5 h to obtain the precursor; S2: Mix 800 mL of deionized water, 100 g of precursor, and 30 g of calcium nitrate tetrahydrate. Adjust the pH to 11.5 ± 0.5 using 5 wt% sodium hydroxide solution. Add 100 mL of deionized water containing 16 g of aluminum sulfate octadecahydrate at a rate of 1 mL / min. During the addition, maintain the pH at 11.5 using 5 wt% sodium hydroxide solution. Aging at 40 °C for 7 h, filter, wash with deionized water (3 × 100 mL), and vacuum dry at 50 °C for 12 h to obtain modified basalt fibers with surface-deposited hydrated calcium sulfoaluminate.

[0020] Figure 1 The image shows a scanning electron microscope (SEM) image of the modified basalt fiber. As can be seen from the image, the fiber has a typical cylindrical shape, with granular deposits uniformly attached to the surface, forming a relatively uniform rough coating layer. No obvious detachment or large-sized agglomerates were observed, indicating that after silane coupling treatment, hydrated calcium sulfoaluminate can be well deposited and fixed on the surface of the basalt fiber.

[0021] Figure 2 The figures show the infrared spectra of basalt fibers, precursors, and modified basalt fibers. As can be seen from the figures, basalt fibers exhibit infrared spectroscopy at 3420 cm⁻¹. -1 1150cm -1 -1000cm -1 and 810cm -1 The vibrational peaks at 2850 cm⁻¹ correspond to the characteristic peaks of the stretching vibrations of basalt fibers -OH, Si-O-Si, and Si-O inorganic frameworks, respectively; while the precursor's peaks are at 2850 cm⁻¹. -1 New asymmetric and symmetric stretching vibration peaks of CH were added nearby, and at 1580 cm⁻¹ -1 The presence of NH bending vibration peaks on both sides indicates that γ-aminoethylaminopropyltrimethoxysilane was successfully grafted onto the fiber surface via hydrolysis and condensation in step S1, introducing organic functional groups; the spectra of the modified basalt fiber show peaks at 3636 and 3432 cm⁻¹. -1 At this point, a broad and strong absorption band of OH stretching vibration is observed, along with a band at 618 cm⁻¹. -1 Corresponding to SO4 2- The bending vibrations indicate that a hydrated calcium sulfoaluminate structure has formed on the fiber surface.

[0022] Example 3 Preparation of modified basalt fiber S1: Mix 200 mL of 90 wt% ethanol solution and 8 g of γ-aminoethylaminopropyltrimethoxysilane, adjust the pH to 3 with 5 wt% hydrochloric acid solution, stir for 20 min, add 100 g of basalt fiber, heat to 60 ℃ and stir for 5 h, cool to room temperature, filter, wash with 70 wt% ethanol solution (2 × 100 mL), and vacuum dry at 100 ℃ for 5 h to obtain the precursor; S2: Mix 800 mL of deionized water, 100 g of precursor, and 35 g of calcium nitrate tetrahydrate. Adjust the pH to 12 ± 0.5 using 5 wt% sodium hydroxide solution. Add 100 mL of deionized water containing 18 g of aluminum sulfate octadecahydrate at a rate of 1 mL / min. During the addition, maintain the pH at 12 using 5 wt% sodium hydroxide solution. Aging at 40 °C for 8 h, filter, wash with deionized water (3 × 100 mL), and vacuum dry at 50 °C for 12 h to obtain modified basalt fibers with surface-deposited hydrated calcium sulfoaluminate.

[0023] Example 4: Preparation of Modified Basalt Fiber Reinforced Self-Leveling Mortar (1) Weigh out: 180g of ordinary silicate cement, 60g of rapid-hardening sulfoaluminate cement, 40g of gypsum, 350g of quartz sand, 150g of calcium carbonate, 5g of modified basalt fiber (prepared in Example 1), 20g of redispersible latex powder (ethylene, vinyl acetate and tert-carbonate terpolymer powder), 0.5g of cellulose ether (hydroxypropyl methylcellulose ether), 0.5g of defoamer (modified polyether high-efficiency powder defoamer P805), 1g of retarder (citric acid), and 1g of water-reducing agent (polycarboxylate water-reducing agent); (2) Add ordinary silicate cement, rapid hardening sulfoaluminate cement, gypsum, quartz sand, calcium carbonate, modified basalt fiber, redispersible latex powder, cellulose ether, defoamer, retarder and water-reducing agent into the mixer in sequence, and stir at 150 rpm for 10 min to obtain modified basalt fiber reinforced self-leveling mortar powder.

[0024] Example 5: Preparation of Modified Basalt Fiber Reinforced Self-Leveling Mortar (1) Weigh out: 200g of ordinary silicate cement, 80g of rapid-hardening sulfoaluminate cement, 60g of gypsum, 400g of quartz sand, 180g of calcium carbonate, 8g of modified basalt fiber (prepared in Example 2), 30g of redispersible latex powder (ethylene, vinyl acetate and tert-carbonate terpolymer powder), 0.8g of cellulose ether (hydroxypropyl methylcellulose ether), 1.2g of defoamer (modified polyether high-efficiency powder defoamer P805), 1.5g of retarder (citric acid), and 2g of water-reducing agent (polycarboxylate water-reducing agent); (2) Add ordinary silicate cement, rapid hardening sulfoaluminate cement, gypsum, quartz sand, calcium carbonate, modified basalt fiber, redispersible latex powder, cellulose ether, defoamer, retarder and water-reducing agent into the mixer in sequence, and stir at 150 rpm for 10 min to obtain modified basalt fiber reinforced self-leveling mortar powder.

[0025] Example 6: Preparation of Modified Basalt Fiber Reinforced Self-Leveling Mortar (1) Weigh out: 220g of ordinary silicate cement, 100g of rapid-hardening sulfoaluminate cement, 80g of gypsum, 450g of quartz sand, 200g of calcium carbonate, 10g of modified basalt fiber (prepared in Example 3), 40g of redispersible latex powder (ethylene and vinyl acetate copolymer powder), 1g of cellulose ether (hydroxypropyl methylcellulose ether), 2g of defoamer (modified polyether high-efficiency powder defoamer P805), 2g of retarder (tartaric acid), and 3g of water-reducing agent (polycarboxylate water-reducing agent); (2) Add ordinary silicate cement, rapid hardening sulfoaluminate cement, gypsum, quartz sand, calcium carbonate, modified basalt fiber, redispersible latex powder, cellulose ether, defoamer, retarder and water-reducing agent into the mixer in sequence, and stir at 150 rpm for 10 min to obtain modified basalt fiber reinforced self-leveling mortar powder.

[0026] When using the modified basalt fiber reinforced self-leveling mortar powder prepared in this application, the self-leveling mortar slurry is prepared by mixing water and powder in a mass ratio of (0.9-1):4.

[0027] Comparative Example 1 The raw material composition and preparation method of the modified basalt fiber reinforced self-leveling mortar are basically the same as those in Example 5, except that the modified basalt fiber is replaced with an equal weight of basalt fiber.

[0028] Comparative Example 2 The raw material composition and preparation method of the modified basalt fiber reinforced self-leveling mortar are basically the same as those in Example 5, except that the modified basalt fiber is replaced with an equal weight of modified basalt fiber prepared by the following method: Mix 800 mL of deionized water, 100 g of basalt fiber, and 30 g of calcium nitrate tetrahydrate. Adjust the pH to 11.5 using 15 wt% sodium hydroxide solution. Add 100 mL of deionized water containing 16 g of aluminum sulfate octadecahydrate dropwise, maintaining the pH at 11.5 during the addition. Aging at room temperature for 7 h, filter, wash with deionized water (3 × 50 mL), and vacuum dry at 80 °C for 5 h to obtain modified basalt fiber.

[0029] Comparative Example 3 The raw material composition and preparation method of the modified basalt fiber reinforced self-leveling mortar are basically the same as those in Example 5. The difference is that the modified basalt fiber is replaced with an equal weight of the precursor prepared in step S1 of Example 2.

[0030] Comparative Example 4 The raw material composition and preparation method of the modified basalt fiber reinforced self-leveling mortar are basically the same as those in Example 5, except that the modified basalt fiber is replaced with an equal weight of modified basalt fiber prepared by the following method: The preparation method of modified basalt fiber is basically the same as that in Example 2, except that γ-aminoethylaminopropyltrimethoxysilane in step S1 is replaced with an equal weight of γ-aminopropyltrimethoxysilane.

[0031] Comparative Example 5 The raw material composition and preparation method of the modified basalt fiber reinforced self-leveling mortar are basically the same as those in Example 5, except that the modified basalt fiber is replaced with an equal weight of modified basalt fiber prepared by the following method: The preparation method of modified basalt fiber is basically the same as that in Example 2, except that γ-aminoethylaminopropyltrimethoxysilane in step S1 is replaced with an equimolar amount of 3-(2-aminoethylamino)propylmethyldimethoxysilane.

[0032] Comparative Example 6 The raw material composition and preparation method of the modified basalt fiber reinforced self-leveling mortar are basically the same as those in Example 5, except that the modified basalt fiber is replaced with an equal weight of modified basalt fiber prepared by the following method: The preparation method of modified basalt fiber is basically the same as that in Example 2, except that calcium nitrate tetrahydrate in step S2 is replaced with 15g.

[0033] Comparative Example 7 The raw material composition and preparation method of the modified basalt fiber reinforced self-leveling mortar are basically the same as those in Example 5, except that the modified basalt fiber is replaced with an equal weight of modified basalt fiber prepared by the following method: The preparation method of modified basalt fiber is basically the same as that in Example 2, except that the basalt fiber in step S1 is replaced with basalt fiber of equal weight with a short cut length of 6 mm.

[0034] Comparative Example 8 The raw material composition and preparation method of the modified basalt fiber reinforced self-leveling mortar are basically the same as those in Example 5. The difference is that the rapid hardening sulfoaluminate cement is replaced with an equal mass of high alumina cement (CA70 type).

[0035] The ordinary silicate cement used in this application is grade PO 42.5, produced by Jiangsu Shanhe Cement Co., Ltd.; the rapid-hardening sulfoaluminate cement is grade R·SAC42.5, produced by Dengdian Group Cement Co., Ltd.; the gypsum is hemihydrate gypsum powder, produced by Changde Hongguan Gypsum Environmental Protection Materials Technology Co., Ltd.; the quartz sand has a particle size distribution of 70-140 mesh, produced by Fengyang County Dongsheng Quartz Sand Co., Ltd.; the calcium carbonate is heavy calcium carbonate with an average particle size of 325 mesh, produced by Jiangxi Bairui Calcium Carbonate Co., Ltd.; the terpolymer powder of ethylene, vinyl acetate and tert-vinyl carbonate is grade Vinnapas 8031H, and the copolymer powder of ethylene and vinyl acetate is grade Vinnapas. 4115, produced by Guangdong Longhu Technology Co., Ltd.; hydroxypropyl methylcellulose ether, model HPK400, produced by Shandong Heda Group Co., Ltd.; modified polyether high-efficiency powder defoamer P805, produced by Shandong Landu New Materials Co., Ltd.; high-performance polycarboxylate superplasticizer, model POLYFLEX™740, produced by Shandong Zhongwei High-tech Materials Co., Ltd.; basalt fiber with an average diameter of 11μm and a short chopped length of 3mm, produced by Jiangsu Lvcaigu New Materials Technology Development Co., Ltd., before use, should be completely immersed in acetone for ultrasonic cleaning for 30 minutes and dried at 80℃ to constant weight.

[0036] The modified basalt fiber reinforced self-leveling mortars prepared in the examples and comparative examples were tested for fluidity, tensile bond strength, 28-day compressive strength, 28-day flexural strength, and dimensional change rate according to JC / T 985-2017 standard. The tests were conducted at a temperature of 23°C and a humidity of 53%, and the water used in the tests was 0.25 times the weight of the self-leveling mortar. The results are shown in Table 1.

[0037] Table 1 Performance Test Data

[0038] As can be seen from the data in Table 1, the modified basalt fiber reinforced self-leveling mortar prepared by the present invention has excellent fluidity and fluidity retention rate, tensile bond strength, 28-day compressive strength, 28-day flexural strength and dimensional stability. This is mainly due to the good synergistic effect formed between the composite cementitious system, filler, functional additives and modified basalt fiber.

[0039] Basalt fibers possess high tensile strength and elastic modulus. When dispersed in mortar, they form a three-dimensional bridging reinforcement network, bearing some tensile stress during mortar shrinkage or under load, thus preventing the initiation and propagation of microcracks. However, their interaction with cement hydration products relies primarily on physical interlocking, resulting in insufficient interfacial bonding. This leads to issues such as fiber pull-out, interfacial debonding, and low stress transfer efficiency during stress. This application introduces a silane coupling layer onto the surface of basalt fibers through the hydrolysis of a silane coupling agent. Then, through the coordination of primary and secondary amine groups in the coupling agent with metal ions, a hydrated calcium sulfoaluminate deposition layer is generated in situ. The hydrated calcium sulfoaluminate structure improves the fiber surface roughness and reactivity, enabling stronger mechanical and chemical bonding with cement hydration products. This improves the structure of the fiber-matrix interface transition zone and, synergistically with the silane layer, enhances the interfacial bonding and stability between the basalt fibers and the matrix. The composite cementitious system composed of silicate cement, sulfur-aluminate cement, and gypsum generates moderate micro-expansion compensation, which helps reduce drying shrinkage stress and provides stable later-stage strength for the mortar. Modified basalt fibers form a stable three-dimensional bridging network within the hardened mortar, which can improve the structure of the interface transition zone, disperse stress, and prevent microcrack propagation. Quartz sand and calcium carbonate have different particle size distributions, and they can form a complementary particle size effect in the system, which can effectively fill the pores, reduce the system porosity, improve the slurry density, and improve the particle dispersion state in conjunction with polycarboxylate superplasticizer, so that the mortar can maintain good self-leveling properties. The synergistic effect of each component makes the self-leveling mortar have good fluidity, bond strength, and mechanical strength.

[0040] In Comparative Example 4, when modified basalt fibers were prepared using monoamino silanes, the ability of monoamino silanes to capture metal ions was significantly weaker, resulting in an uneven distribution of the hydrated calcium sulfoaluminate layer. Therefore, the improvement in tensile bond strength and toughness was far inferior to that of the examples. In Comparative Example 7, the modified basalt fibers were longer, significantly increasing their aspect ratio in the self-leveling mortar system. This reduced the mortar's fluidity and disrupted the uniform distribution of the fibers in the matrix, leading to poor continuity of the three-dimensional support network and preventing the formation of a dense interfacial reinforcement effect, thus reducing its tensile bond strength and mechanical strength.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. However, any modifications, alterations, and variations made by those skilled in the art without departing from the scope of the present invention based on the disclosed technical content are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, and variations made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the present invention.

Claims

1. A modified basalt fiber-reinforced self-leveling mortar, characterized in that, The ingredients include the following parts by weight: 18-22 parts ordinary silicate cement, 6-10 parts rapid-hardening sulfoaluminate cement, 4-8 parts gypsum, 35-45 parts quartz sand, 15-20 parts calcium carbonate, 0.5-1 part modified basalt fiber, 2-4 parts redispersible latex powder, 0.05-0.1 parts cellulose ether, 0.05-0.2 parts defoamer, 0.1-0.2 parts retarder, and 0.1-0.3 parts water-reducing agent; The modified basalt fiber is prepared by the following method: S1: Mix the ethanol solution and silane coupling agent thoroughly, adjust the pH to 3-5, add basalt fiber, heat and stir, then filter, wash and dry to obtain the precursor. S2: Mix deionized water, precursor, and calcium nitrate tetrahydrate, adjust the pH to 11-12 with alkaline solution, add aluminum sulfate octadecahydrate dropwise while maintaining the pH during the dropwise addition, age at room temperature, and obtain modified basalt fiber after filtration, washing, and drying.

2. The modified basalt fiber reinforced self-leveling mortar according to claim 1, characterized in that, The redispersible latex powder is one of the following: ethylene, vinyl acetate and ethylene tert-carbonate terpolymer powder, and ethylene and vinyl acetate copolymer powder.

3. The modified basalt fiber reinforced self-leveling mortar according to claim 1, characterized in that, The cellulose ether is hydroxypropyl methylcellulose ether.

4. The modified basalt fiber reinforced self-leveling mortar according to claim 1, characterized in that, The defoamer is a modified polyether-based high-efficiency powder defoamer, model P805.

5. The modified basalt fiber reinforced self-leveling mortar according to claim 1, characterized in that, The retarder is one of citric acid and tartaric acid.

6. The modified basalt fiber reinforced self-leveling mortar according to claim 1, characterized in that, The water-reducing agent is a polycarboxylate water-reducing agent.

7. The modified basalt fiber reinforced self-leveling mortar according to claim 1, characterized in that, In step S1, the mass ratio of the silane coupling agent to the basalt fiber is (5-8):

100.

8. The modified basalt fiber reinforced self-leveling mortar according to claim 1, characterized in that, In step S1, the silane coupling agent is γ-aminoethylaminopropyltrimethoxysilane.

9. The modified basalt fiber reinforced self-leveling mortar according to claim 1, characterized in that, In step S2, the mass ratio of the precursor, calcium nitrate tetrahydrate, and aluminum sulfate octadecahydrate is 100:(25-35):(12-18).

10. A method for preparing modified basalt fiber reinforced self-leveling mortar, characterized in that, Includes the following steps: (1) Weigh out the following by weight: 18-22 parts of ordinary silicate cement, 6-10 parts of rapid-hardening sulfoaluminate cement, 4-8 parts of gypsum, 35-45 parts of quartz sand, 15-20 parts of calcium carbonate, 0.5-1 parts of modified basalt fiber, 2-4 parts of redispersible latex powder, 0.05-0.1 parts of cellulose ether, 0.05-0.2 parts of defoamer, 0.1-0.2 parts of retarder, and 0.1-0.3 parts of water-reducing agent; (2) Mix ordinary silicate cement, rapid hardening sulfoaluminate cement, gypsum, quartz sand, calcium carbonate, modified basalt fiber, redispersible latex powder, cellulose ether, defoamer, retarder and water-reducing agent to obtain modified basalt fiber reinforced self-leveling mortar.

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