Glass fiber modified rubber mortar

Abstract

The invention relates to glass fiber modified rubber mortar, and belongs to the technical field of building materials. The regenerated rubber powder in the mortar is subjected to irradiation grafting modification, the modifier is loaded on the surface of the rubber powder subjected to irradiation grafting modification, and when the mortar is mixed, the hydrophilicity of the modified regenerated rubber powder is effectively improved through sulfonic groups on the surface of the modified regenerated rubber powder; furthermore, the modified regenerated rubber powder can be fully infiltrated by the mortar, and the repulsive force between the modified regenerated rubber powder and the cement mortar is reduced, so that interface pores in the mortar are reduced, the flowability and dispersity of the mortar are improved, and the effect of improving the thermal insulation property of the mortar is achieved; the modified regenerated rubber powder can also form stable chemical bonding with a silicate cement hydration product, so that an interface transition area is denser, and the mechanical anchoring and stress transfer effects after mortar curing are effectively enhanced.

Description

Technical Field

[0001] This invention belongs to the field of building materials technology, specifically relating to a glass fiber modified rubber mortar. Background Technology

[0002] Cement mortar is made by mixing cement, fine aggregate, and water as needed. In construction engineering, it is used for two main purposes: first, as a binder for foundation and wall masonry materials; and second, for interior and exterior plastering. In recent years, construction engineering technology has advanced rapidly, and the requirements for building materials have become increasingly demanding in terms of high strength, high performance, and composite materials. Consequently, the requirements for the performance of cement mortar have also become more stringent, and its shortcomings in toughness and durability have become increasingly apparent.

[0003] Adding rubber to cement mortar can improve its durability and brittleness, and also positively affect its thermal insulation performance. However, the inherent strong hydrophobicity of rubber powder leads to poor compatibility with hydrophilic cement paste, making it difficult to be fully wetted during mixing. This easily introduces interfacial defects and pores, severely degrading the material's mechanical strength. Secondly, the significant difference in modulus between rubber particles and the hard cement hydration products results in weak interfacial bonding, making them prone to stress concentration points under stress, leading to premature failure. On the other hand, incorporating alkali-resistant glass fiber is another effective means to improve the crack resistance and toughness of cement-based materials. Fibers can bridge cracks in the matrix and prevent their propagation. However, glass fiber has a smooth surface and is chemically inert. Its bonding with the cement matrix mainly relies on physical and mechanical anchoring, with weak chemical bonding forces. Under high stress, it is prone to pull-out or slippage failure, failing to fully realize its reinforcing potential. To address these technical shortcomings, this invention provides a glass fiber modified rubber mortar. Summary of the Invention

[0004] The purpose of this invention is to provide a glass fiber modified rubber mortar to solve the problems mentioned in the background art.

[0005] The objective of this invention can be achieved through the following technical solutions: A glass fiber modified rubber mortar comprises the following raw materials in parts by weight: 2800-3500 parts river sand, 1300-1500 parts silicate cement, 280-350 parts modified recycled rubber powder, 15-35 parts alkali-resistant glass fiber, 50-100 parts fly ash, 12-15 parts water-reducing agent, and 700-720 parts water.

[0006] Furthermore, the modified recycled rubber powder is prepared by the following steps: S1. A nucleophilic substitution reaction is carried out between 2-amino-2-methylpropane-1-sulfonic acid and 3-chloropropyltriethoxysilane to obtain a modifier precursor; S2. The modifier precursor is reacted with vinylphosphoryl chloride via a nucleophilic substitution reaction to obtain the modifier; S3. Modified reclaimed rubber powder is obtained by loading the modifier onto the surface of alkali-treated reclaimed rubber powder through irradiation grafting.

[0007] Furthermore, the reaction conditions in S1 are: 2-Amino-2-methylpropane-1-sulfonic acid, 3-chloropropyltriethoxysilane, and N,N-dimethylformamide were mixed and reacted at 100–120 °C for 2–6 h. After the reaction was completed, the reaction solution was poured into petroleum ether to precipitate, and the precipitate was separated by filtration to obtain the modifier precursor.

[0008] Furthermore, the reaction conditions in S2 are: The modifier precursor, vinylphosphoryl chloride, triethylamine, and acetonitrile are mixed and reacted at 55–75°C for 1–4 hours. After the reaction is completed, the solid is separated by filtration, and the remaining filtrate is poured into petroleum ether to precipitate. The precipitate is then separated by filtration to obtain the modifier.

[0009] Furthermore, the reaction conditions in S3 are as follows: Rubber powder is alkali-treated to obtain alkali-treated reclaimed rubber powder. The alkali-treated reclaimed rubber powder, modifier, toluene, and N,N-dimethylformamide are then mixed and placed in an irradiation grafting tube for electron beam irradiation grafting. The irradiation dose is 25-45 kGy. After the irradiation grafting is completed, the solid is filtered to separate it, and the obtained solid is washed with anhydrous ethanol and dried to obtain modified reclaimed rubber powder.

[0010] Furthermore, the conditions for alkali treatment are as follows: Reclaimed rubber powder and a 5-10% sodium hydroxide aqueous solution are mixed and treated at room temperature for 30-60 minutes. After the alkali treatment is completed, the solid is filtered out, washed with deionized water, and dried to obtain the alkali-treated reclaimed rubber powder.

[0011] Furthermore, the mass ratio of 2-amino-2-methylpropane-1-sulfonic acid to 3-chloropropyltriethoxysilane used in S1 is 20-25:36-45.

[0012] Furthermore, the mass ratio of the modifier precursor used in S2 to vinylphosphoryl chloride is 40-50:8-10.

[0013] Furthermore, the mass ratio of the modifier used in S3 to the alkali-treated reclaimed rubber powder is 28–35:280–350.

[0014] Furthermore, the mass ratio of the recycled rubber powder used in the alkali treatment step to the 5-10% sodium hydroxide aqueous solution is 300-360:1500-1800.

[0015] This invention further provides a method for preparing the glass fiber modified rubber mortar: Silicate cement, fly ash, and water are mixed in a container and stirred until homogeneous. Then, river sand, modified recycled rubber powder, alkali-resistant glass fiber, and water-reducing agent are added to the system and stirred until homogeneous to obtain glass fiber modified rubber mortar.

[0016] Furthermore, after the glass fiber modified rubber mortar is vibrated and compacted, it is cured at a temperature of 19-21℃ for 28 days to obtain glass fiber modified rubber mortar concrete.

[0017] The beneficial effects of this invention are: This invention modifies reclaimed rubber powder by irradiation grafting. The surface of the irradiated rubber powder is loaded with the modifier of this invention. During mortar mixing, the sulfonic acid groups on the surface of the modified reclaimed rubber powder effectively improve the hydrophilicity of the modified reclaimed rubber powder, ensuring that the modified reclaimed rubber powder can be fully wetted by the mortar, reducing the repulsive force between the modified reclaimed rubber powder and cement mortar, thereby reducing the interfacial porosity inside the mortar and improving the fluidity of the mortar. In addition, the negative charge formed by the ionization of sulfonic acid groups can also improve the dispersibility of the modified reclaimed rubber powder in the mortar by utilizing electrostatic repulsion, thereby improving the thermal insulation performance of the mortar.

[0018] This invention modifies reclaimed rubber powder through irradiation grafting. The surface of the irradiated rubber powder is loaded with the modifier of this invention. After the mortar is cured, the siloxane structure on the surface of the modified reclaimed rubber powder can form a stable chemical bond with the hydroxyl groups in the CSH gel of silicate cement hydration products, while the phosphoramide structure can form a strong coordination bond with calcium ions, iron ions and other ions in silicate cement. The synergistic effect of the two effects can effectively enhance the interfacial bonding force between the modified reclaimed rubber powder and the mortar, making the interfacial transition zone denser. On this basis, since more uniform and firm nodes are formed between the modified reclaimed rubber powder and the mortar, when the alkali-resistant glass fiber passes through these nodes, the path of the alkali-resistant glass fiber being pulled out or sliding will be more complex, thereby effectively enhancing the mechanical anchoring and stress transfer effect after the mortar is cured.

[0019] Traditional rubber mortar suffers from a significant decrease in strength due to weak interfaces. This invention reduces stress concentration and defects caused by rubber incorporation through strong interfacial bonding, enabling the mortar to maintain high compressive and flexural strength while achieving high toughness, thus realizing an optimized balance between rigidity and elasticity. Detailed Implementation

[0020] This invention provides a glass fiber modified rubber mortar. Those skilled in the art can refer to the content of this document and appropriately modify the process parameters to achieve its effect. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art and fall within the scope of protection of this invention. The methods and applications of this invention have been described through preferred embodiments. Those skilled in the art can obviously make modifications or appropriate alterations and combinations to the methods and applications described herein without departing from the content, spirit, and scope of this invention to realize and apply the technology of this invention.

[0021] It should be understood that the expression “one or more of…” individually includes each of the objects described after the expression, as well as various different combinations of two or more of the described objects, unless otherwise understood from the context and usage. The expression “and / or” combined with three or more described objects should be understood to have the same meaning, unless otherwise understood from the context.

[0022] The terms “including,” “having,” or “containing,” including the use of their grammatical synonyms, should generally be understood as open-ended and non-restrictive, for example, not excluding other unstated elements or steps, unless otherwise specifically stated or understood from the context.

[0023] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. A and B can be singular or plural.

[0024] In this application, "at least one" means one or more, and "more than one" means two or more. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items.

[0025] It should be understood that the order of the steps or the order in which certain actions are performed is not important as long as the invention remains operational. Furthermore, two or more steps or actions can be performed simultaneously.

[0026] The use of any and all instances or exemplary language such as “e.g.” or “including” in this document is merely intended to better illustrate the invention and is not intended to limit the scope of the invention unless the claims are made. No language in this specification should be construed as indicating that any unclaimed element is essential to the practice of the invention.

[0027] Furthermore, the numerical ranges and parameters used to define the present invention are approximate values, and the relevant values ​​in the specific embodiments have been presented as precisely as possible. However, any value inevitably contains standard deviations due to individual test methods. Therefore, unless explicitly stated otherwise, it should be understood that all ranges, quantities, values, and percentages used in this disclosure are modified with the word "approximately". Here, "approximately" generally means that the actual value is within plus or minus 10%, 5%, 1%, or 0.5% of a specific value or range.

[0028] It should be understood that in the various embodiments of this application, the order of the above processes does not imply the order of execution. Some or all steps may be executed in parallel or sequentially. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0029] The embodiments and comparative examples of this invention describe some examples, in which the embodiments illustrate certain implementations of the invention. However, this does not mean that the effects of the invention can only be achieved in these examples.

[0030] To further illustrate the present invention, the following describes in detail a glass fiber modified rubber mortar provided by the present invention with reference to embodiments. Example 1

[0031] A glass fiber modified rubber mortar comprises the following raw materials in parts by weight: 2800 parts river sand, 1300 parts silicate cement, 280 parts modified recycled rubber powder, 15 parts alkali-resistant glass fiber, 50 parts fly ash, 12 parts water-reducing agent, and 700 parts water.

[0032] In this embodiment, the cement used is PSA32.5 slag silicate cement, the alkali-resistant glass fiber has a length of 6mm, the fly ash used is Grade I fly ash, the water-reducing agent used is a polycarboxylate water-reducing agent, and the modified recycled rubber powder used is prepared by the following steps: S1. By mass, 20 parts of 2-amino-2-methylpropane-1-sulfonic acid, 36 parts of 3-chloropropyltriethoxysilane, and 200 parts of N,N-dimethylformamide are mixed and reacted at 100℃ for 6 hours. After the reaction is completed, the reaction solution is poured into petroleum ether to precipitate. The precipitate is separated by filtration to obtain the modifier precursor. S2. By mass, 40 parts of the modifier precursor, 8 parts of vinylphosphoryl chloride, 12 parts of triethylamine, and 240 parts of acetonitrile are mixed and reacted at 55°C for 4 hours. After the reaction is completed, the solid is separated by filtration and the remaining filtrate is poured into petroleum ether to precipitate. The precipitate is then separated by filtration to obtain the modifier. S3. By mass fraction, 300 parts of recycled rubber powder and 1500 parts of 5% sodium hydroxide aqueous solution are mixed and treated at room temperature for 60 minutes. After the alkali treatment is completed, the solid is filtered out and the obtained solid is washed with deionized water and dried to obtain the alkali-treated recycled rubber powder. S4. By mass, 280 parts of alkali-treated reclaimed rubber powder, 28 parts of modifier, 280 parts of toluene, and 840 parts of N,N-dimethylformamide are mixed and placed in an irradiation grafting tube for electron beam irradiation grafting. The irradiation dose is 25 kGy. After the irradiation grafting is completed, the solid is filtered to separate it, and the obtained solid is washed with anhydrous ethanol and dried to obtain modified reclaimed rubber powder.

[0033] In this embodiment, the particle size of the recycled rubber powder is 20 mesh. Example 2

[0034] A glass fiber modified rubber mortar comprises the following raw materials in parts by weight: 3150 parts river sand, 1400 parts silicate cement, 315 parts modified recycled rubber powder, 25 parts alkali-resistant glass fiber, 75 parts fly ash, 13.5 parts water-reducing agent, and 710 parts water.

[0035] In this embodiment, the cement used is PSA32.5 slag silicate cement, the alkali-resistant glass fiber has a length of 6mm, the fly ash used is Grade I fly ash, the water-reducing agent used is a polycarboxylate water-reducing agent, and the modified recycled rubber powder used is prepared by the following steps: S1. By mass, 22.5 parts of 2-amino-2-methylpropane-1-sulfonic acid, 40.5 parts of 3-chloropropyltriethoxysilane, and 225 parts of N,N-dimethylformamide are mixed and reacted at 110°C for 4 hours. After the reaction is completed, the reaction solution is poured into petroleum ether to precipitate. The precipitate is separated by filtration to obtain the modifier precursor. S2. By mass, 45 parts of the modifier precursor, 9 parts of vinylphosphoryl chloride, 13.5 parts of triethylamine, and 270 parts of acetonitrile are mixed and reacted at 65°C for 2.5 hours. After the reaction is completed, the solid is separated by filtration and the remaining filtrate is poured into petroleum ether to precipitate. The precipitate is then separated by filtration to obtain the modifier. S3. By mass fraction, 330 parts of recycled rubber powder and 1650 parts of 7.5% sodium hydroxide aqueous solution are mixed and treated at room temperature for 45 minutes. After the alkali treatment is completed, the solid is filtered out and the obtained solid is washed with deionized water and dried to obtain the alkali-treated recycled rubber powder. S4. By mass, 315 parts of alkali-treated reclaimed rubber powder, 31.5 parts of modifier, 315 parts of toluene, and 945 parts of N,N-dimethylformamide are mixed and placed in an irradiation grafting tube for electron beam irradiation grafting. The irradiation dose is 35 kGy. After the irradiation grafting is completed, the solid is filtered to separate it, and the obtained solid is washed with anhydrous ethanol and dried to obtain modified reclaimed rubber powder.

[0036] In this embodiment, the particle size of the recycled rubber powder is 20 mesh. Example 3

[0037] A glass fiber modified rubber mortar comprises the following raw materials in parts by weight: 3500 parts river sand, 1500 parts silicate cement, 350 parts modified recycled rubber powder, 35 parts alkali-resistant glass fiber, 100 parts fly ash, 15 parts water-reducing agent, and 720 parts water.

[0038] In this embodiment, the cement used is PSA32.5 slag silicate cement, the alkali-resistant glass fiber has a length of 6mm, the fly ash used is Grade I fly ash, the water-reducing agent used is a polycarboxylate water-reducing agent, and the modified recycled rubber powder used is prepared by the following steps: S1. By mass, 25 parts of 2-amino-2-methylpropane-1-sulfonic acid, 45 parts of 3-chloropropyltriethoxysilane, and 250 parts of N,N-dimethylformamide are mixed and reacted at 120°C for 2 hours. After the reaction is completed, the reaction solution is poured into petroleum ether to precipitate. The precipitate is separated by filtration to obtain the modifier precursor. S2. By mass, 50 parts of modifier precursor, 10 parts of vinylphosphoryl chloride, 15 parts of triethylamine and 300 parts of acetonitrile are mixed and reacted at 75°C for 1 hour. After the reaction is completed, the solid is separated by filtration and the remaining filtrate is poured into petroleum ether to precipitate. The precipitate is then separated by filtration to obtain the modifier. S3. By mass fraction, 360 parts of recycled rubber powder and 1800 parts of 10% sodium hydroxide aqueous solution are mixed and treated at room temperature for 30 minutes. After the alkali treatment is completed, the solid is filtered out and the obtained solid is washed with deionized water and dried to obtain the alkali-treated recycled rubber powder. S4. By mass, 350 parts of alkali-treated reclaimed rubber powder, 35 parts of modifier, 350 parts of toluene, and 1050 parts of N,N-dimethylformamide are mixed and placed in an irradiation grafting tube for electron beam irradiation grafting. The irradiation dose is 45 kGy. After the irradiation grafting is completed, the solid is filtered to separate it, and the obtained solid is washed with anhydrous ethanol and dried to obtain modified reclaimed rubber powder.

[0039] In this embodiment, the particle size of the recycled rubber powder is 20 mesh. Example 4

[0040] A glass fiber modified rubber mortar comprises the following raw materials in parts by weight: 3302 parts river sand, 1445 parts silicate cement, 330 parts modified recycled rubber powder, 32 parts alkali-resistant glass fiber, 56 parts fly ash, 13.2 parts water-reducing agent, and 719 parts water.

[0041] In this embodiment, the cement used is PSA32.5 slag silicate cement, the alkali-resistant glass fiber has a length of 6mm, the fly ash used is Grade I fly ash, the water-reducing agent used is a polycarboxylate water-reducing agent, and the modified recycled rubber powder used is prepared by the following steps: S1. By mass, 25 parts of 2-amino-2-methylpropane-1-sulfonic acid, 45 parts of 3-chloropropyltriethoxysilane, and 250 parts of N,N-dimethylformamide are mixed and reacted at 120°C for 2 hours. After the reaction is completed, the reaction solution is poured into petroleum ether to precipitate. The precipitate is separated by filtration to obtain the modifier precursor. S2. By mass, 50 parts of modifier precursor, 10 parts of vinylphosphoryl chloride, 15 parts of triethylamine and 300 parts of acetonitrile are mixed and reacted at 75°C for 1 hour. After the reaction is completed, the solid is separated by filtration and the remaining filtrate is poured into petroleum ether to precipitate. The precipitate is then separated by filtration to obtain the modifier. S3. By mass fraction, 360 parts of recycled rubber powder and 1800 parts of 10% sodium hydroxide aqueous solution are mixed and treated at room temperature for 30 minutes. After the alkali treatment is completed, the solid is filtered out and the obtained solid is washed with deionized water and dried to obtain the alkali-treated recycled rubber powder. S4. By mass, 350 parts of alkali-treated reclaimed rubber powder, 35 parts of modifier, 350 parts of toluene, and 1050 parts of N,N-dimethylformamide are mixed and placed in an irradiation grafting tube for electron beam irradiation grafting. The irradiation dose is 45 kGy. After the irradiation grafting is completed, the solid is filtered to separate it, and the obtained solid is washed with anhydrous ethanol and dried to obtain modified reclaimed rubber powder.

[0042] In this embodiment, the particle size of the recycled rubber powder is 20 mesh. Example 5

[0043] A glass fiber modified rubber mortar comprises the following raw materials in parts by weight: 3035 parts river sand, 1329 parts silicate cement, 303 parts modified recycled rubber powder, 24 parts alkali-resistant glass fiber, 74 parts fly ash, 14.4 parts water-reducing agent, and 703 parts water.

[0044] In this embodiment, the cement used is PSA32.5 slag silicate cement, the alkali-resistant glass fiber has a length of 6mm, the fly ash used is Grade I fly ash, the water-reducing agent used is a polycarboxylate water-reducing agent, and the modified recycled rubber powder used is prepared by the following steps: S1. By mass, 22.5 parts of 2-amino-2-methylpropane-1-sulfonic acid, 40.5 parts of 3-chloropropyltriethoxysilane, and 225 parts of N,N-dimethylformamide are mixed and reacted at 110°C for 4 hours. After the reaction is completed, the reaction solution is poured into petroleum ether to precipitate. The precipitate is separated by filtration to obtain the modifier precursor. S2. By mass, 45 parts of the modifier precursor, 9 parts of vinylphosphoryl chloride, 13.5 parts of triethylamine, and 270 parts of acetonitrile are mixed and reacted at 65°C for 2.5 hours. After the reaction is completed, the solid is separated by filtration and the remaining filtrate is poured into petroleum ether to precipitate. The precipitate is then separated by filtration to obtain the modifier. S3. By mass fraction, 330 parts of recycled rubber powder and 1650 parts of 7.5% sodium hydroxide aqueous solution are mixed and treated at room temperature for 45 minutes. After the alkali treatment is completed, the solid is filtered out and the obtained solid is washed with deionized water and dried to obtain the alkali-treated recycled rubber powder. S4. By mass, 315 parts of alkali-treated reclaimed rubber powder, 31.5 parts of modifier, 315 parts of toluene, and 945 parts of N,N-dimethylformamide are mixed and placed in an irradiation grafting tube for electron beam irradiation grafting. The irradiation dose is 35 kGy. After the irradiation grafting is completed, the solid is filtered to separate it, and the obtained solid is washed with anhydrous ethanol and dried to obtain modified reclaimed rubber powder.

[0045] In this embodiment, the particle size of the recycled rubber powder is 20 mesh.

[0046] Comparative Example 1 The difference between this comparative example and Example 5 is that no additional modified recycled rubber powder is prepared; instead, an equal mass of unmodified recycled rubber powder is used to replace it, while the mass proportions of the remaining raw materials remain unchanged.

[0047] Experimental Example 1 The raw materials from Examples 1-5 and Comparative Example 1 were prepared into glass fiber modified rubber mortar according to the following preparation method: Silicate cement, fly ash, and water are mixed in a container and stirred until homogeneous. Then, river sand, modified recycled rubber powder, alkali-resistant glass fiber, and water-reducing agent are added to the system and stirred until homogeneous to obtain glass fiber modified rubber mortar.

[0048] The flowability of each component of the glass fiber modified rubber mortar in Examples 1-5 and Comparative Example 1 was tested according to the national standard GB / T 2419 "Determination of Flowability of Cement Mortar". The test results are shown in Table 1: Table 1 project Flowability (mm) Example 1 253 Example 2 259 Example 3 268 Example 4 264 Example 5 258 Comparative Example 1 223 Example 2

[0049] Concrete specimens were prepared using the glass fiber modified rubber mortars obtained in Examples 1-5 and Comparative Example 1 according to the following preparation method: After the glass fiber modified rubber mortar is vibrated and compacted, it is cured at a temperature of 19-21℃ for 28 days to obtain glass fiber modified rubber mortar concrete specimens.

[0050] Performance tests were conducted on the specimens obtained after curing of the glass fiber modified rubber mortar components in Examples 1-5 and Comparative Example 1. The flexural and compressive strengths of each component were tested according to GB / T17671 "Test Method for Strength of Cement Mortar (ISO Method)", the impact strength was tested according to GB / T1843 "Impact Test Method for Plastic Cantilever Beams", and the thermal conductivity was tested according to GB / T 6342 "Determination of Linear Dimensions of Foamed Plastics and Rubber". The test structures are shown in Table 2. Table 2 project Flexural strength / MPa Compressive strength / MPa <![CDATA[Impact strength / kJ / m 2 > Thermal conductivity / W / (m·K) Example 1 11.3 55.4 17.6 0.2386 Example 2 12.4 52.1 18.4 0.2215 Example 3 13.6 49.2 19.4 0.2074 Example 4 12.8 50.1 19.1 0.2147 Example 5 11.9 52.6 18.2 0.2269 Comparative Example 1 10.3 45.4 15.7 0.3141 The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A glass fiber modified rubber mortar, characterized in that, It contains the following raw materials: river sand, silicate cement, modified recycled rubber powder, alkali-resistant glass fiber, fly ash, water-reducing agent, and water; The modified recycled rubber powder is prepared by the following steps: S1. A nucleophilic substitution reaction is carried out between 2-amino-2-methylpropane-1-sulfonic acid and 3-chloropropyltriethoxysilane to obtain a modifier precursor; S2. The modifier precursor is reacted with vinylphosphoryl chloride via a nucleophilic substitution reaction to obtain the modifier; S3. Modified reclaimed rubber powder is obtained by loading the modifier onto the surface of alkali-treated reclaimed rubber powder through irradiation grafting.

2. The glass fiber modified rubber mortar according to claim 1, characterized in that, The raw materials contain the following parts by weight: 2800-3500 parts river sand, 1300-1500 parts silicate cement, 280-350 parts modified recycled rubber powder, 15-35 parts alkali-resistant glass fiber, 50-100 parts fly ash, 12-15 parts water-reducing agent, and 700-720 parts water.

3. The glass fiber modified rubber mortar according to claim 1, characterized in that, The reaction conditions in S1 are: 2-Amino-2-methylpropane-1-sulfonic acid, 3-chloropropyltriethoxysilane, and N,N-dimethylformamide were mixed and reacted at 100–120 °C for 2–6 h. After the reaction was completed, the reaction solution was poured into petroleum ether to precipitate, and the precipitate was separated by filtration to obtain the modifier precursor.

4. The glass fiber modified rubber mortar according to claim 1, characterized in that, The reaction conditions in S2 are: The modifier precursor, vinylphosphoryl chloride, triethylamine, and acetonitrile are mixed and reacted at 55–75°C for 1–4 hours. After the reaction is completed, the solid is separated by filtration, and the remaining filtrate is poured into petroleum ether to precipitate. The precipitate is then separated by filtration to obtain the modifier.

5. The glass fiber modified rubber mortar according to claim 1, characterized in that, The reaction conditions in S3 are: Rubber powder is alkali-treated to obtain alkali-treated reclaimed rubber powder. The alkali-treated reclaimed rubber powder, modifier, toluene, and N,N-dimethylformamide are then mixed and placed in an irradiation grafting tube for electron beam irradiation grafting. The irradiation dose is 25-45 kGy. After the irradiation grafting is completed, the solid is filtered to separate it, and the obtained solid is washed with anhydrous ethanol and dried to obtain modified reclaimed rubber powder.

6. The glass fiber modified rubber mortar according to claim 3, characterized in that, The mass ratio of 2-amino-2-methylpropane-1-sulfonic acid to 3-chloropropyltriethoxysilane used in S1 is 20-25:36-45.

7. The glass fiber modified rubber mortar according to claim 4, characterized in that, The mass ratio of the modifier precursor used in S2 to vinylphosphoryl chloride is 40-50:8-10.

8. The glass fiber modified rubber mortar according to claim 5, characterized in that, The mass ratio of the modifier used in S3 to the alkali-treated reclaimed rubber powder is 28-35:280-350.

9. The glass fiber modified rubber mortar according to claim 5, characterized in that, The conditions for alkali treatment are: Reclaimed rubber powder and a 5-10% sodium hydroxide aqueous solution are mixed and treated at room temperature for 30-60 minutes. After the alkali treatment is completed, the solid is filtered out, washed with deionized water, and dried to obtain the alkali-treated reclaimed rubber powder.

10. The glass fiber modified rubber mortar according to claim 1, characterized in that, The mass ratio of the recycled rubber powder used in the alkali treatment step to the sodium hydroxide aqueous solution with a mass fraction of 5-10% is 300-360:1500-1800.