High-strength rubber mortar material and method for preparing the same

Abstract

The application provides a high-strength rubber mortar material and a preparation method thereof, and belongs to the technical field of rubber mortar. According to the weight parts, the raw materials include cement 80-120 parts, sand 240-350 parts, water 50-65 parts, water reducing agent 0.5-1 part, and alkaline microbeads 1-12 parts. The shell material of the alkaline microbeads includes chitosan 18-22 parts, polyvinylpyrrolidone 0.1-1 part, emulsifier 1-3 parts, water 18-22 parts, and acetic acid 18-22 parts. The core material includes initiator 0.1-1 part, rubber powder 1-3 parts, emulsifier 0.5-2 parts, water 18-22 parts, and acetic acid 18-22 parts. The rubber is wrapped in the shell of the microbead, so that the rubber powder can be prevented from agglomerating during the preparation of the mortar. The emulsion is prepared by using ultrasonic waves, the porosity of the mortar is effectively reduced, the problem that the rubber powder affects the hydration of cement is solved, the strength of the rubber mortar product is improved, and the recycling of waste rubber is realized.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of rubber mortar, and particularly relates to a high-strength rubber mortar material and a preparation method thereof. BACKGROUND

[0002] Waste tires are difficult to degrade in the natural environment, and long-term stacking not only causes land pollution, but also easily forms a fire hazard. The accumulation of waste tires easily accumulates water and becomes a breeding ground for mosquitoes and flies, increasing the risk of disease transmission. Not only should the development and utilization of clean energy be increased, but the recycling process of waste is also a key link in energy saving and emission reduction. It is considered an effective way to solve environmental pollution problems to crush waste tires as aggregate to prepare elastic concrete.

[0003] In the eastern coastal areas and the northwest regions of China, the underground soil and groundwater contain a large amount of erosive ions, which have great harm to the durability of cement-based materials. After being eroded by the erosive medium in the environment, the building components will produce peeling, swelling, cracking and other situations, which seriously affect the service life of the building components. The waste rubber particles have high toughness and elasticity, which can effectively improve the toughness of the concrete and absorb part of the strain energy when stressed, thereby improving the anti-cracking performance. The elasticity and softness of the waste rubber can freely shrink and swell when the temperature changes, thereby reducing the internal stress and the generation of microcracks. The hydrophobic property of the waste rubber can also significantly reduce the corrosion rate of the concrete in the acid, alkali and other chemical erosion environments. However, the strength of the rubber particles is lower than that of the natural aggregate, and the air entraining property of the rough surface of the rubber particles will form a large number of pores in the mortar, thereby reducing the strength of the mortar and making it difficult to meet the application conditions of the building mortar.

[0004] Therefore, it is necessary to provide an improved technical solution for the above-mentioned deficiencies of the prior art. SUMMARY

[0005] The application aims to provide a high-strength rubber mortar material and a preparation method thereof, so as to solve the problems of ordinary concrete mortar not being corrosion-resistant and rubber mortar being corrosion-resistant but having low strength.

[0006] In order to achieve the above-mentioned purpose, the application provides the following technical solution:

[0007] A high-strength rubber mortar material, according to weight parts, the raw materials include cement 80-120 parts, sand 240-350 parts, water 50-65 parts, water reducing agent 0.5-1 part, and alkaline microbeads 1-12 parts. The main component of the core material of the alkaline microbeads is rubber powder.

[0008] Preferably, according to weight parts, the shell material of the alkaline microbeads includes chitosan 18-22 parts, polyvinylpyrrolidone 0.1-1 part, emulsifier 1-3 parts, water 18-22 parts, and acetic acid 18-22 parts.

[0009] Preferably, the core material of the basic microbead comprises initiator 0.1-1 parts by weight, rubber powder 1-3 parts by weight, emulsifier 0.5-2 parts by weight, water 18-22 parts by weight, acetic acid 18-22 parts by weight.

[0010] Preferably, the cement is ordinary Portland cement, the sand is natural river sand, and the water reducing agent is a naphthalene series water reducing agent.

[0011] Preferably, the initiator is benzoyl peroxide.

[0012] Preferably, the emulsifier is AEO-20.

[0013] Preferably, the rubber powder is made of waste tires.

[0014] Preferably, the weight ratio of the shell material to the core material is not less than 1:1.

[0015] Preferably, the weight ratio of the shell material to the core material is (1-1.5):1.

[0016] The application also provides a preparation method of the high-strength rubber mortar material.

[0017] S1, mixing the core material of the basic microbead and using ultrasonic emulsification to obtain an emulsion;

[0018] S2, adding the shell material of the basic microbead to the emulsion prepared in step S1 to perform in-situ polymerization reaction, after the reaction is completed, performing suction filtration, drying the filter residue in an oven, and then grinding to obtain the basic microbead;

[0019] S4, adding the weighed basic microbead, cement, sand, water reducing agent, and part of water into a stirring device, stirring slowly for 1 min first, then adding the remaining water, and stirring quickly for 1 min to obtain the rubber mortar material.

[0020] Beneficial effects:

[0021] (1) The application uses ultrasonic to prepare the emulsion, so that the emulsion completely wets the surface of the rubber particles, drives the air adsorbed on the surface of the rubber particles, effectively reduces the porosity of the mortar, thereby reducing the influence on the cement hydration, improving the strength of the concrete, and solving the problem of low strength of the rubber mortar.

[0022] (2) the chitosan in the basic microbead shell contains amine group functional groups, which can accept protons, thus exhibiting basicity, and in an acidic erosion environment, the shell reacts with acidic substances and is destroyed, releasing the internal rubber powder, which significantly improves the erosion resistance by virtue of the hydrophobicity and capillary pore blocking of the rubber powder;

[0023] (3) the rubber powders have obvious agglomeration, and in the stirring process, part of the water is wrapped, which affects the strength development due to insufficient cement hydration water, the rubber is wrapped in the microbead shell, which avoids the agglomeration of the rubber powder in the preparation process of the mortar, thus solving the problem of the influence of the rubber powder on the cement hydration, and improving the strength of the rubber mortar product. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, and are incorporated herein for purposes of explanation and are not intended to limit the application. In the drawings:

[0025] Fig. 1 Variations of the porosity, water absorption and flexural strength of the rubber mortar test pieces provided for Examples 3-6 of the present application.

[0026] Fig. 2 Variations of the sulfate erosion resistance coefficient and compressive strength of the rubber mortar test pieces provided for Examples 3-6 of the present application.

[0027] Fig. 3 Variations of the porosity, water absorption and flexural strength of the rubber mortar test pieces provided for Comparative Examples 1-4.

[0028] Fig. 4 Variations of the sulfate erosion resistance coefficient and compressive strength of the rubber mortar test pieces provided for Comparative Examples 1-4.

[0029] Fig. 5 Variations of the sulfate erosion resistance coefficient and compressive strength of the rubber mortar test pieces provided for Comparative Examples 5 and 6.

[0030] Fig. 6 Variations of the porosity, water absorption and flexural strength of the rubber mortar test pieces provided for Comparative Examples 5 and 6. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0032] The application will be described in detail below with examples. It should be noted that the examples in the application and the features in the examples can be combined with each other without conflict.

[0033] The application provides a high-strength rubber mortar material to solve the problem of low strength of the rubber mortar. The raw materials include, by weight, cement 80-120 parts (for example, 81 parts, 85 parts, 90 parts, 95 parts, 100 parts, 105 parts, 110 parts, 115 parts, 119 parts), sand 240-350 parts (for example, 241 parts, 250 parts, 260 parts, 270 parts, 280 parts, 290 parts, 300 parts, 310 parts, 320 parts, 330 parts, 340 parts, 349 parts), water 50-65 parts (for example, 51 parts, 53 parts, 55 parts, 57 parts, 59 parts, 60 parts, 61 parts, 63 parts), water reducing agent 0.5-1 part (for example, 0.6 part, 0.7 part, 0.8 part, 0.9 part), alkaline microbeads 1-12 parts (for example, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts, 10 parts, 11 parts), and the main component of the core material of the alkaline microbeads is rubber powder.

[0034] The application uses alkaline materials to wrap rubber powder particles to obtain alkaline microbeads, which can be added into mortar to avoid agglomeration and air carrying of rubber powder during the preparation of mortar, thereby solving the problem that the strength of the rubber mortar product is significantly reduced relative to ordinary cement mortar. The shell of the alkaline microbead can be damaged in an acidic erosion environment to release the internal rubber powder, and the hydrophobicity and capillary pore blocking of the rubber powder can significantly improve the erosion resistance.

[0035] In the preferred embodiment of the application, by weight, the shell material of the alkaline microbead includes chitosan 18-22 parts (for example, 18.5 parts, 19 parts, 19.5 parts, 20 parts, 20.5 parts, 21 parts, 21.5 parts), polyvinylpyrrolidone 0.1-1 part (for example, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part), emulsifier 1-3 parts (for example, 1.5 parts, 2 parts, 2.5 parts), water 18-22 parts (for example, 18.5 parts, 19 parts, 19.5 parts, 20 parts, 20.5 parts, 21 parts, 21.5 parts), and acetic acid 18-22 parts (for example, 18.5 parts, 19 parts, 19.5 parts, 20 parts, 20.5 parts, 21 parts, 21.5 parts).

[0036] In a preferred embodiment of the present invention, the core material of the alkaline microspheres comprises, by weight, 0.1 to 1 part initiator (e.g., 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, or 0.9 parts), 1 to 3 parts rubber powder (e.g., 1.5, 2, or 2.5 parts), 0.5 to 2 parts emulsifier (e.g., 0.6, 1.0, 1.5, or 1.9 parts), 18 to 22 parts water (e.g., 18.5, 19, 19.5, 20, 20.5, 21, or 21.5 parts), and 18 to 22 parts acetic acid (e.g., 18.5, 19, 19.5, 20, 20.5, 21, or 21.5 parts).

[0037] In a preferred embodiment of the present invention, the cement is ordinary silicate cement, the sand is natural river sand, and the water-reducing agent is a naphthalene-based water-reducing agent.

[0038] In a preferred embodiment of the present invention, the initiator is benzoyl peroxide.

[0039] In a preferred embodiment of the present invention, the emulsifier is AEO-20. APEO series emulsifiers or sodium dodecyl sulfate can also be used, but the effect is slightly worse than that of AEO-20.

[0040] In a preferred embodiment of the present invention, the rubber powder is made from waste tires.

[0041] In a preferred embodiment of the present invention, the weight ratio of the shell material to the core material is not less than 1:1 (for example, the weight ratio is 1:1, 1.2:1, 1.5:1, or 2:1).

[0042] In a preferred embodiment of the present invention, the weight ratio of the shell material to the core material is (1 to 1.5):1, for example, a weight ratio of 1.1:1, 1.2:1, 1.3, or 1.4:1.

[0043] The present invention also provides a method for preparing any of the above-mentioned high-strength rubber mortar materials, comprising the following steps:

[0044] S1. Mix the core material of the alkaline microbeads and emulsify them using ultrasound to obtain an emulsion;

[0045] S2. Add the shell material of the alkaline microspheres to the emulsion prepared in step S1 and carry out in-situ polymerization reaction. After the reaction is completed, filter the mixture, put the filter residue into an oven to dry, and then grind it to obtain alkaline microspheres.

[0046] S4. Add the weighed alkaline microspheres, cement, sand, water-reducing agent, and some water to the mixing equipment. First, mix slowly for 1 minute, then add the remaining water and mix quickly for 1 minute to obtain the final product.

[0047] The following detailed description of a high-strength rubber mortar material and its preparation method according to the present invention is provided through specific embodiments.

[0048] In the following examples:

[0049] The emulsifier is AEO-20, content 99%, purchased from Shandong Yousuo Chemical Technology Co., Ltd.;

[0050] The initiator is benzoyl peroxide, analytical pure, purchased from Shanghai Maikelin Biochemical Technology Co., Ltd.;

[0051] The water reducing agent is naphthalene series water reducing agent, purchased from Henan Danait New Material Co., Ltd., with the brand of naphthalene series No. 1;

[0052] Chitosan, degree of deacetylation ≥95%, viscosity 100-200 mPa·s, purchased from Henan Danait New Material Co., Ltd.;

[0053] Acetic acid, analytical pure, purchased from Henan Danait New Material Co., Ltd.;

[0054] Polyvinylpyrrolidone, purchased from Tianjin Kemio Chemical Reagent Co., Ltd.;

[0055] Cement is ordinary Portland cement, purchased from Jiaozuo City Qianye Co., Ltd. in Henan Province;

[0056] Rubber powder is obtained by crushing waste tires to 200 mesh.

[0057] Example 1

[0058] Preparation of alkaline microbeads:

[0059] The alkaline microbeads provided in this embodiment are composed of a shell material and a core material wrapped inside the shell material. Specifically, the shell material includes chitosan 20 parts, polyvinylpyrrolidone 0.5 parts, emulsifier 2 parts, water 20 parts, and acetic acid 20 parts. The core material includes initiator 0.5 parts, rubber powder 2 parts, emulsifier 1 part, water 20 parts, and acetic acid 20 parts. The weight ratio of the shell material to the core material is 2:1.5.

[0060] The preparation method of the above alkaline microbeads is as follows:

[0061] S1, mix the core material of alkaline microbeads, and use ultrasonic emulsification, ultrasonic frequency 20-40 kHz, emulsification time 40 min, control the temperature of the raw materials during ultrasonic emulsification not more than 80℃, to obtain an emulsion;

[0062] S2, add the shell material of alkaline microbeads to the emulsion prepared in step S1, and carry out in-situ polymerization reaction. After the reaction is completed, the filter residue is placed in an oven at 100℃ and dried for 10 min, then ground to a 200 mesh sieve with a residue rate not more than 1%, to obtain the alkaline microbeads.

[0063] Example 2

[0064] Preparation of alkaline microbeads:

[0065] The basic microbead provided in this embodiment is composed of a shell material and a core material wrapped inside the shell material, wherein the raw material composition of the shell material and the core material is the same as in Embodiment 1, except that the weight ratio of the shell material to the core material is 1:1.

[0066] The preparation steps of the basic microbead provided in this embodiment are the same as in Embodiment 1.

[0067] Embodiment 3

[0068] Preparation of rubber mortar:

[0069] The rubber mortar provided in this embodiment has the following raw materials in parts by weight: natural cement 100 parts, natural river sand 300 parts, naphthalene-based water reducing agent 0.6 parts, water 50 parts, and basic microbead 1.5 parts. The basic microbead used in this embodiment is prepared according to Embodiment 1.

[0070] The preparation process of the rubber mortar is as follows: the basic microbead, natural river sand, cement, and naphthalene-based water reducing agent are added together into a stirring device and stirred at a slow speed of 30 rpm for 1 min; then 50 parts of water is added and stirred at a fast speed of 60 rpm for 1 min, to obtain the rubber mortar. The prepared rubber mortar is poured into a mold for shaping, demolded after standard curing for 24 h, and further cured until the 28d age.

[0071] Embodiment 4

[0072] Preparation of rubber mortar:

[0073] The rubber mortar provided in this embodiment has the following raw materials in parts by weight: natural cement 100 parts, natural river sand 300 parts, naphthalene-based water reducing agent 0.6 parts, water 55 parts, and basic microbead 6 parts. The basic microbead used in this embodiment is prepared according to Embodiment 2.

[0074] The preparation process of the rubber mortar is as follows: the basic microbead, natural river sand, cement, and naphthalene-based water reducing agent are added together into a stirring device and stirred at a slow speed of 30 rpm for 1 min; then 55 parts of water is added and stirred at a fast speed of 60 rpm for 1 min, to obtain the rubber mortar. The prepared rubber mortar is poured into a mold for shaping, demolded after standard curing for 24 h, and further cured until the 28d age.

[0075] Embodiment 5

[0076] Preparation of rubber mortar:

[0077] The rubber mortar provided in this embodiment has the following raw materials in parts by weight: natural cement 100 parts, natural river sand 300 parts, naphthalene-based water reducing agent 0.6 parts, water 60 parts, and basic microbead 9 parts. The basic microbead used in this embodiment is prepared according to Embodiment 2.

[0078] The preparation process of the rubber mortar is as follows: the alkaline microbeads, natural river sand, cement, and naphthalene series water reducing agent are added into a stirring device, stirred at 30 rpm for 1 min; then 60 parts of water are added, and stirred at 60 rpm for 1 min, to obtain the rubber mortar. The prepared rubber mortar is poured into a mold for molding, demolded after standard curing for 24 h, and continuously cured until the 28 d age.

[0079] Example 6

[0080] Preparation of the rubber mortar:

[0081] The rubber mortar provided in this example has the following raw materials in parts by weight: natural cement 100 parts, natural river sand 300 parts, naphthalene series water reducing agent 0.6 parts, water 60 parts, and alkaline microbeads 12 parts. The alkaline microbeads used in this example are prepared according to Example 2.

[0082] The preparation process of the rubber mortar is as follows: the alkaline microbeads, natural river sand, cement, and naphthalene series water reducing agent are added into a stirring device, stirred at 30 rpm for 1 min; then 60 parts of water are added, and stirred at 60 rpm for 1 min, to obtain the rubber mortar. The prepared rubber mortar is poured into a mold for molding, demolded after standard curing for 24 h, and continuously cured until the 28 d age.

[0083] Comparative Example 1

[0084] Preparation of the rubber mortar:

[0085] The rubber mortar provided in this example has the following raw materials in parts by weight: natural cement 100 parts, natural river sand 300 parts, naphthalene series water reducing agent 0.6 parts, water 50 parts, and rubber powder 1.5 parts.

[0086] The preparation method of the rubber mortar is according to Example 3.

[0087] Comparative Example 2

[0088] Preparation of the rubber mortar:

[0089] The rubber mortar provided in this example has the following raw materials in parts by weight: natural cement 100 parts, natural river sand 300 parts, naphthalene series water reducing agent 0.6 parts, water 50 parts, and rubber powder 3 parts.

[0090] The preparation method of the rubber mortar is according to Example 4.

[0091] Comparative Example 3

[0092] Preparation of the rubber mortar:

[0093] The rubber mortar provided by the embodiment comprises the following raw materials in parts by weight: 100 parts of natural cement, 300 parts of natural river sand, 0.6 parts of a naphthalene series water reducing agent, 60 parts of water, and 4.5 parts of rubber powder.

[0094] The rubber mortar is prepared according to the preparation method of the rubber mortar in Embodiment 5.

[0095] Comparative Example 4

[0096] Preparation of the rubber mortar:

[0097] The rubber mortar provided by the embodiment comprises the following raw materials in parts by weight: 100 parts of natural cement, 300 parts of natural river sand, 0.6 parts of a naphthalene series water reducing agent, 60 parts of water, and 4.5 parts of rubber powder.

[0098] The rubber mortar is prepared according to the preparation method of the rubber mortar in Embodiment 6.

[0099] Comparative Example 5

[0100] The emulsifier AEO-20 used in Embodiment 1 is replaced with an equal amount of sodium dodecyl sulfate produced by Shanghai Maikelin Biochemical Technology Co., Ltd., and the proportions of other components remain unchanged, to prepare alkaline microbeads and rubber mortar according to the proportions in Embodiment 3.

[0101] Comparative Example 6

[0102] The emulsifier AEO-20 used in Embodiment 1 is replaced with an equal amount of alkylphenol polyoxyethylene ether produced by Shandong Yousuo Chemical Technology Co., Ltd., and the proportions of other components remain unchanged, to prepare alkaline microbeads and rubber mortar according to the proportions in Embodiment 3.

[0103] The rubber mortar test pieces prepared in Embodiments 3-6 and Comparative Examples 1-6 are subjected to porosity testing by nuclear magnetic resonance method, and the formed rubber mortar test pieces are subjected to flexural strength and compressive strength testing according to GB / T 50081-2019 “Standard for Testing Methods for Physical and Mechanical Properties of Concrete”, and the formed rubber mortar test pieces are subjected to water absorption rate testing and sulphate attack resistance coefficient testing according to GB / T 749-2008 “Method for Testing Resistance of Cement to Sulphate Attack”, and the test results are shown in Table 1 and Figs. 1-6 .

[0104] Table 1 Test data of rubber mortar samples prepared in Embodiments 3-6 and Comparative Examples 1-6

[0105]

[0106]

[0107] As can be seen from Table 1, when the rubber powder in different weight fractions is incorporated, the prepared rubber mortar test pieces all have strong resistance to sulphate attack, the sulphate attack resistance coefficients of the rubber mortar test pieces provided by Examples 3-6 and Comparative Examples 1-4 are all above 1.1, which indicates that the incorporation of the rubber powder can obviously improve the sulphate attack resistance of the mortar.

[0108] As shown in Table 1, the rubber mortar test pieces provided by Examples 3-6 and Comparative Examples 1-4 are compared respectively, it can be seen that the higher the content of the rubber powder in the rubber mortar test piece, the greater the porosity and water absorption of the test piece, and the porosity and water absorption of Examples 3-6 are lower than those of Comparative Examples 1-4, which shows that when the rubber powder is wrapped inside the alkaline microbeads, the porosity and water absorption of the rubber mortar test piece are obviously reduced, the resistance to sulphate attack is obviously stronger than that of the rubber powder directly added, and the compressive strength and flexural strength of the rubber mortar test piece are improved to different degrees, and the compactness of the rubber mortar test piece is obviously improved. Figs. 1-4 As shown in Table 1, the rubber mortar test pieces provided by Examples 3-6 and Comparative Examples 1-4 are compared respectively, it can be seen that the higher the content of the rubber powder in the rubber mortar test piece, the greater the porosity and water absorption of the test piece, and the porosity and water absorption of Examples 3-6 are lower than those of Comparative Examples 1-4, which shows that when the rubber powder is wrapped inside the alkaline microbeads, the porosity and water absorption of the rubber mortar test piece are obviously reduced, the resistance to sulphate attack is obviously stronger than that of the rubber powder directly added, and the compressive strength and flexural strength of the rubber mortar test piece are improved to different degrees, and the compactness of the rubber mortar test piece is obviously improved.

[0109] As shown in Table 1, the rubber mortar test pieces provided by Examples 3-6 and Comparative Examples 1-4 are compared respectively, it can be seen that the higher the content of the rubber powder in the rubber mortar test piece, the greater the porosity and water absorption of the test piece, and the porosity and water absorption of Examples 3-6 are lower than those of Comparative Examples 1-4, which shows that when the rubber powder is wrapped inside the alkaline microbeads, the porosity and water absorption of the rubber mortar test piece are obviously reduced, the resistance to sulphate attack is obviously stronger than that of the rubber powder directly added, and the compressive strength and flexural strength of the rubber mortar test piece are improved to different degrees, and the compactness of the rubber mortar test piece is obviously improved.

[0110] Fig. 5 As shown in Table 1, the rubber mortar test pieces provided by Examples 3-6 and Comparative Examples 1-4 are compared respectively, it can be seen that the higher the content of the rubber powder in the rubber mortar test piece, the greater the porosity and water absorption of the test piece, and the porosity and water absorption of Examples 3-6 are lower than those of Comparative Examples 1-4, which shows that when the rubber powder is wrapped inside the alkaline microbeads, the porosity and water absorption of the rubber mortar test piece are obviously reduced, the resistance to sulphate attack is obviously stronger than that of the rubber powder directly added, and the compressive strength and flexural strength of the rubber mortar test piece are improved to different degrees, and the compactness of the rubber mortar test piece is obviously improved. 6 As shown in Table 1, the rubber mortar test pieces provided by Examples 3-6 and Comparative Examples 1-4 are compared respectively, it can be seen that the higher the content of the rubber powder in the rubber mortar test piece, the greater the porosity and water absorption of the test piece, and the porosity and water absorption of Examples 3-6 are lower than those of Comparative Examples 1-4, which shows that when the rubber powder is wrapped inside the alkaline microbeads, the porosity and water absorption of the rubber mortar test piece are obviously reduced, the resistance to sulphate attack is obviously stronger than that of the rubber powder directly added, and the compressive strength and flexural strength of the rubber mortar test piece are improved to different degrees, and the compactness of the rubber mortar test piece is obviously improved.

[0111] As shown in Table 1, the rubber mortar test pieces provided by Examples 3-6 and Comparative Examples 1-4 are compared respectively, it can be seen that the higher the content of the rubber powder in the rubber mortar test piece, the greater the porosity and water absorption of the test piece, and the porosity and water absorption of Examples 3-6 are lower than those of Comparative Examples 1-4, which shows that when the rubber powder is wrapped inside the alkaline microbeads, the porosity and water absorption of the rubber mortar test piece are obviously reduced, the resistance to sulphate attack is obviously stronger than that of the rubber powder directly added, and the compressive strength and flexural strength of the rubber mortar test piece are improved to different degrees, and the compactness of the rubber mortar test piece is obviously improved.

[0112] ​The above merely illustrates the preferred embodiments of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high-strength rubber mortar material, characterized in that, By weight, the raw materials include 80-120 parts cement, 240-350 parts sand, 50-65 parts water, 0.5-1 part water-reducing agent, and 1-12 parts alkaline microspheres, wherein the core material of the alkaline microspheres is mainly composed of rubber powder. By weight, the core material of the alkaline microspheres comprises 0.1-1 parts initiator, 1-3 parts rubber powder, 0.5-2 parts emulsifier, 18-22 parts water, and 18-22 parts acetic acid; by weight, the shell material of the alkaline microspheres comprises 18-22 parts chitosan, 0.1-1 parts polyvinylpyrrolidone, 1-3 parts emulsifier, 18-22 parts water, and 18-22 parts acetic acid. The alkaline microspheres are prepared by a method comprising the following steps: The core material of the alkaline microspheres is mixed and emulsified using ultrasound to obtain an emulsion. The shell material of the alkaline microspheres is added to the emulsion prepared above and an in-situ polymerization reaction is carried out. After the reaction is completed, the mixture is filtered, the filter residue is placed in an oven to dry, and then ground to obtain alkaline microspheres.

2. The high-strength rubber mortar material as described in claim 1, characterized in that, The cement is ordinary silicate cement, the sand is natural river sand, and the water-reducing agent is a naphthalene-based water-reducing agent.

3. The high-strength rubber mortar material as described in claim 1, characterized in that, The initiator is benzoyl peroxide.

4. The high-strength rubber mortar material as described in claim 1, characterized in that, The emulsifier is AEO-20.

5. The high-strength rubber mortar material as described in claim 1, characterized in that, The rubber powder is made from waste tires.

6. The high-strength rubber mortar material as described in claim 1, characterized in that, The weight ratio of the shell material to the core material is not less than 1:

1.

7. The high-strength rubber mortar material as described in claim 6, characterized in that, The weight ratio of the shell material to the core material is (1~1.5):

1.

8. A method for preparing a high-strength rubber mortar material as described in any one of claims 1 to 7, characterized in that, Includes the following steps: S1. Mix the core material of the alkaline microbeads and emulsify them using ultrasound to obtain an emulsion; S2. Add the shell material of the alkaline microspheres to the emulsion prepared in step S1 and carry out in-situ polymerization reaction. After the reaction is completed, filter the mixture, put the filter residue into an oven to dry, and then grind it to obtain alkaline microspheres. S4. Add the weighed alkaline microspheres, cement, sand, water-reducing agent, and some water to the mixing equipment. First, mix slowly for 1 minute, then add the remaining water and mix quickly for 1 minute to obtain the final product.

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