Recycled concrete containing light rubber and preparation method thereof

Abstract

The invention relates to the technical field of concrete materials, and particularly discloses recycled concrete containing light rubber and a preparation method of the recycled concrete. The recycled concrete containing the light rubber comprises the following components in parts by mass: 100 parts of water; 194 to 198 parts of cement; 34 to 36 parts of fly ash; 375 to 380 parts of fine aggregate; 595 to 600 parts of coarse aggregate; 160 to 170 parts of modified light rubber powder; 2.8 to 3.2 parts of an auxiliary agent; the preparation method of the modified light rubber powder comprises the following steps: 1) crushing and screening waste tires to obtain light rubber powder; 2) adding the light rubber powder into the modification liquid for modification, filtering out solids after modification is completed, and drying to obtain modified light rubber powder; the modified liquid is a compound of water, sodium dodecyl diphenyl ether disulfonate, sodium fatty acid methyl ester sulfonate and aminopropyltriethoxysilane. The method has the advantage that the strength and the crack resistance of the concrete doped with the rubber powder are further improved.

Description

Technical Field

[0001] The invention relates to the field of concrete materials, in particular to an alkali-activated lightweight rubber recycled concrete and a preparation method thereof. Background Art

[0002] With the development of society, the number of cars is increasing, resulting in a sharp increase in the number of waste tires. The problem of waste tire accumulation is particularly prominent. They not only occupy a large amount of land, but also have the potential risk of causing fire and serious environmental pollution, bringing a heavy burden to the environment. In order to achieve better sustainable development, using waste tires in concrete preparation to prepare recycled concrete is one of the good ways to consume waste tires.

[0003] Usually, waste tires need to be crushed and screened to obtain rubber powder. By adding some rubber powder during the concrete mixing process, the crack resistance of concrete can be improved. However, rubber materials and concrete materials are organic materials and inorganic materials respectively, and the compatibility between the two is poor, resulting in poor quality of the obtained concrete after directly adding rubber powder to concrete. Therefore, the prior art attempts to modify the rubber powder in order to improve the compatibility of the rubber material and the concrete material. Although certain results have been achieved in the prior art, the effect is still not ideal. The strength and crack resistance of the obtained concrete are still not high enough to meet the requirements of the project. Therefore, there is still room for improvement. Summary of the invention

[0004] In order to further improve the strength and crack resistance of concrete mixed with rubber powder, the present application provides a recycled concrete containing lightweight rubber and a preparation method thereof.

[0005] In a first aspect, the present application provides a recycled concrete containing lightweight rubber, which adopts the following technical solution: A recycled concrete containing lightweight rubber, comprising the following components in parts by weight: 100 parts water; Cement 194-198 parts; 34-36 parts of fly ash; 375-380 parts of fine aggregate; 595-600 parts of coarse aggregate; 160-170 parts of modified lightweight rubber powder; 2.8-3.2 parts of additives; The preparation method of the modified lightweight rubber powder is as follows: Step 1), crushing and sieving waste tires to obtain lightweight rubber powder; Step 2), adding the light rubber powder into a modifying liquid for modification, filtering out the solid after the modification is completed, and drying to obtain the modified light rubber powder; The modified liquid is a compound of water, sodium dodecyl diphenyl ether disulfonate, sodium fatty acid methyl ester sulfonate and aminopropyl triethoxysilane.

[0006] By adopting the above technical scheme, the lightweight rubber powder is modified by using a modifying liquid compounded with sodium dodecyl diphenyl ether disulfonate, sodium fatty acid methyl ester sulfonate, and aminopropyl triethoxysilane, so that the compatibility of the modified lightweight rubber powder with cement slurry is greatly improved, and the modified lightweight rubber powder can be well dispersed and evenly dispersed in concrete, and is not easy to agglomerate. After the modified lightweight rubber powder is added, the toughness of the concrete can be well improved, the crack resistance of the concrete is significantly improved, and the strength of the concrete is less affected, so that the strength of the concrete is maintained at a high level, which can well meet the needs of the project, and can realize the consumption of waste tires, reduce the accumulation of waste tires, and well achieve green environmental protection.

[0007] Preferably, in the modified liquid, the mass ratio of sodium dodecyl diphenyl ether disulfonate, sodium fatty acid methyl ester sulfonate, and aminopropyl triethoxysilane is 22-24:7-9:15-17.

[0008] By adopting the above technical scheme and specifically selecting the mass ratio of sodium dodecyl diphenyl ether disulfonate, sodium fatty acid methyl ester sulfonate and aminopropyl triethoxysilane, the modification effect of lightweight rubber powder is better. After the modified lightweight rubber powder is added to concrete, the concrete strength is higher and the crack resistance can be better improved, so that the quality of the concrete is better.

[0009] Preferably, in the modified liquid, the mass ratio of water, sodium dodecyl diphenyl ether disulfonate, sodium fatty acid methyl ester sulfonate, and aminopropyl triethoxysilane is 1000:22-24:7-9:15-17.

[0010] By adopting the above technical scheme and specifically selecting the mass ratio of water, sodium dodecyl diphenyl ether disulfonate, sodium fatty acid methyl ester sulfonate and aminopropyl triethoxysilane, the modification liquid has a better modification effect on lightweight rubber powder, and at the same time can well control the raw material consumption, which has a higher economic value.

[0011] Preferably, in step 1), the particle size of the lightweight rubber powder is 0.15-0.25 mm.

[0012] By adopting the above technical solution and specifically selecting the particle size of the lightweight rubber powder to be 0.15-0.25 mm, the modified lightweight rubber powder can be well filled into the gaps between fine aggregate and coarse aggregate, so that the obtained concrete has higher strength and better crack resistance.

[0013] Preferably, in step 2), the lightweight rubber powder is added to the modification liquid and stirred for 120-150 minutes to complete the modification.

[0014] By adopting the above technical solution, the modification effect is better, the compatibility of the modified lightweight rubber powder and cement slurry is better improved, and the performance of the concrete is better.

[0015] Preferably, in step 2), the lightweight rubber powder is added to the modification liquid, heated to a constant temperature of 45-55° C., and stirred for 120-150 minutes to complete the modification.

[0016] By adopting the above technical solution, the modification speed can be better accelerated through heating, so that the quality of the modified lightweight rubber powder is better and the effect of improving the crack resistance of concrete is better.

[0017] Preferably, the auxiliary agent is a compound of a water reducer and a retarder, and the mass ratio of the water reducer to the retarder is 2-2.2:0.8-1.

[0018] By adopting the above technical scheme, the fluidity of concrete can be improved by adding a water reducer, so that the process performance of concrete is better. By adding a retarder, the concrete has a longer mixing time, and the modified lightweight rubber powder is better dispersed in the concrete, so that the quality of the concrete is better.

[0019] In a second aspect, the present application provides a method for preparing recycled concrete containing lightweight rubber, using the following technical solution: A method for preparing the above-mentioned recycled concrete containing lightweight rubber comprises the following steps: Step 01), cement, fly ash, fine aggregate, coarse aggregate, modified lightweight rubber powder and additives are mixed uniformly to obtain a premix; Step 02), adding water to the premix and stirring evenly to obtain a concrete mixture; Step 03), injecting the concrete mixture into the mold, curing and demoulding, and obtaining recycled concrete containing lightweight rubber.

[0020] By adopting the above technical solution, the prepared concrete has higher strength and higher crack resistance, can well consume waste tires, reduce environmental pollution, well achieve green environmental protection, and has higher economic value.

[0021] In summary, this application has the following beneficial effects: 1. Since the present application uses a modifying liquid compounded with sodium dodecyl diphenyl ether disulfonate, sodium fatty acid methyl ester sulfonate, and aminopropyl triethoxysilane to modify the lightweight rubber powder, the compatibility of the modified lightweight rubber powder with cement slurry is greatly improved, and the modified lightweight rubber powder can be well dispersed and evenly dispersed in concrete, and is not easy to agglomerate. After the modified lightweight rubber powder is added, the toughness of the concrete can be well improved, and the crack resistance of the concrete is significantly improved. In addition, the strength of the concrete is less affected, so that the strength of the concrete is maintained at a high level, which can well meet the needs of the project, and can realize the consumption of waste tires, reduce the accumulation of waste tires, and well achieve green environmental protection.

[0022] 2. In the present application, it is preferred to specifically select the mass ratio of sodium dodecyl diphenyl ether disulfonate, sodium fatty acid methyl ester sulfonate, and aminopropyl triethoxysilane to achieve a better modification effect on the lightweight rubber powder. After the modified lightweight rubber powder is added to the concrete, the concrete strength is higher and the crack resistance can be better improved, so that the quality of the concrete is better.

[0023] 3. In the present application, it is preferred to specifically select the mass ratio of water, sodium dodecyl diphenyl ether disulfonate, sodium fatty acid methyl ester sulfonate, and aminopropyl triethoxysilane so that the modification liquid has a better modification effect on the lightweight rubber powder, and at the same time can well control the raw material consumption and has a higher economic value. DETAILED DESCRIPTION

[0024] The present application is further described in detail below with reference to the embodiments.

[0025] Example 1 A recycled concrete containing lightweight rubber, comprising the following components: Water, cement, fly ash, fine aggregate, coarse aggregate, modified lightweight rubber powder, additives.

[0026] The cement was purchased from Runfeng Cement, silicate cement, P.O42.5R.

[0027] The fly ash is sourced from commercially available, first-grade fly ash.

[0028] The fine aggregate is natural river sand, which is commercially available and has a particle size of 3-5 mm.

[0029] The coarse aggregate is basalt crushed stone, which is commercially available and has a particle size of 15-20 mm.

[0030] The additive is a compound of water reducer and retarder.

[0031] The water reducer is polycarboxylic acid water reducer, purchased from Wuhan Huaxuan High-tech Co., Ltd., model: PC-306.

[0032] The retarder is sodium gluconate, which was purchased from Hebei Laiqi Biotechnology Co., Ltd.

[0033] The preparation method of modified lightweight rubber powder is as follows: Step 1), crushing and sieving the waste tires to obtain lightweight rubber powder with a particle size of 0.15-0.25 mm.

[0034] Step 2), 400 kg of lightweight rubber powder is added into 1000 kg of modified liquid, heated to a constant temperature of 45° C., a rotation speed of 60 r / min, stirred for 120 min, solids are filtered out, and naturally air-dried to obtain modified lightweight rubber powder.

[0035] The modified liquid is a compound of water, sodium dodecyl diphenyl ether disulfonate, sodium fatty acid methyl ester sulfonate and aminopropyl triethoxysilane, and the mass ratio of water, sodium dodecyl diphenyl ether disulfonate, sodium fatty acid methyl ester sulfonate and aminopropyl triethoxysilane is 1000:22:7:15.

[0036] Sodium dodecyl diphenyl ether disulfonate is commercially available, CAS number: 7575-62-4.

[0037] Sodium fatty acid methyl ester sulfonate is commercially available, CAS number: 93348-22-2.

[0038] Aminopropyltriethoxysilane is commercially available, CAS number: 919-30-2.

[0039] The method for preparing recycled concrete containing lightweight rubber comprises the following steps: Step 01), put 194kg cement, 34kg fly ash, 375kg fine aggregate, 595kg coarse aggregate, 160kg modified lightweight rubber powder, 2kg water reducer, and 0.8kg retarder into a mixer, 60r / min, stir for 15min, and obtain a premix.

[0040] Step 02), add 100kg water to the premix, stir at 60r / min for 15min to obtain concrete mixture.

[0041] Step 03), inject the concrete mixture into the mold, sprinkle water for 3 days, demould, sprinkle water for 7 days, and let it stand for 28 days to obtain recycled concrete containing lightweight rubber.

[0042] Example 2 A recycled concrete containing lightweight rubber, comprising the following components: Water, cement, fly ash, fine aggregate, coarse aggregate, modified lightweight rubber powder, additives.

[0043] The cement was purchased from Runfeng Cement, silicate cement, P.O42.5R.

[0044] The fly ash is sourced from commercially available, first-grade fly ash.

[0045] The fine aggregate is natural river sand, which is commercially available and has a particle size of 3-5 mm.

[0046] The coarse aggregate is basalt crushed stone, which is commercially available and has a particle size of 15-20 mm.

[0047] The additive is a compound of water reducer and retarder.

[0048] The water reducer is polycarboxylic acid water reducer, purchased from Wuhan Huaxuan High-tech Co., Ltd., model: PC-306.

[0049] The retarder is sodium gluconate, which was purchased from Hebei Laiqi Biotechnology Co., Ltd.

[0050] The preparation method of modified lightweight rubber powder is as follows: Step 1), crushing and sieving the waste tires to obtain lightweight rubber powder with a particle size of 0.15-0.25 mm.

[0051] Step 2), 500 kg of lightweight rubber powder is added into 1000 kg of modified liquid, heated to a constant temperature of 50° C., a rotation speed of 60 r / min, stirred for 135 min, solids are filtered out, and naturally air-dried to obtain modified lightweight rubber powder.

[0052] The modified liquid is a compound of water, sodium dodecyl diphenyl ether disulfonate, sodium fatty acid methyl ester sulfonate and aminopropyl triethoxysilane, and the mass ratio of water, sodium dodecyl diphenyl ether disulfonate, sodium fatty acid methyl ester sulfonate and aminopropyl triethoxysilane is 1000:23:8:16.

[0053] Sodium dodecyl diphenyl ether disulfonate is commercially available, CAS number: 7575-62-4.

[0054] Sodium fatty acid methyl ester sulfonate is commercially available, CAS number: 93348-22-2.

[0055] Aminopropyltriethoxysilane is commercially available, CAS number: 919-30-2.

[0056] The method for preparing recycled concrete containing lightweight rubber comprises the following steps: Step 01), put 196kg cement, 35kg fly ash, 377.5kg fine aggregate, 597.5kg coarse aggregate, 165kg modified lightweight rubber powder, 2.1kg water reducer, and 0.9kg retarder into a mixer, 60r / min, stir for 15min, and obtain a premix.

[0057] Step 02), add 100kg water to the premix, stir at 60r / min for 15min to obtain concrete mixture.

[0058] Step 03), inject the concrete mixture into the mold, sprinkle water for 3 days, demould, sprinkle water for 7 days, and let it stand for 28 days to obtain recycled concrete containing lightweight rubber.

[0059] Example 3 A recycled concrete containing lightweight rubber, comprising the following components: Water, cement, fly ash, fine aggregate, coarse aggregate, modified lightweight rubber powder, additives.

[0060] The cement was purchased from Runfeng Cement, silicate cement, P.O42.5R.

[0061] The fly ash is sourced from commercially available, first-grade fly ash.

[0062] The fine aggregate is natural river sand, which is commercially available and has a particle size of 3-5 mm.

[0063] The coarse aggregate is basalt crushed stone, which is commercially available and has a particle size of 15-20 mm.

[0064] The additive is a compound of water reducer and retarder.

[0065] The water reducer is polycarboxylic acid water reducer, purchased from Wuhan Huaxuan High-tech Co., Ltd., model: PC-306.

[0066] The retarder is sodium gluconate, which was purchased from Hebei Laiqi Biotechnology Co., Ltd.

[0067] The preparation method of modified lightweight rubber powder is as follows: Step 1), crushing and sieving the waste tires to obtain lightweight rubber powder with a particle size of 0.15-0.25 mm.

[0068] Step 2), 600 kg of lightweight rubber powder is added into 1000 kg of modified liquid, heated to a constant temperature of 55° C., a rotation speed of 60 r / min, stirred for 150 min, the solid is filtered out, and naturally air-dried to obtain modified lightweight rubber powder.

[0069] The modified liquid is a compound of water, sodium dodecyl diphenyl ether disulfonate, sodium fatty acid methyl ester sulfonate and aminopropyl triethoxysilane, and the mass ratio of water, sodium dodecyl diphenyl ether disulfonate, sodium fatty acid methyl ester sulfonate and aminopropyl triethoxysilane is 1000:24:9:17.

[0070] Sodium dodecyl diphenyl ether disulfonate is commercially available, CAS number: 7575-62-4.

[0071] Sodium fatty acid methyl ester sulfonate is commercially available, CAS number: 93348-22-2.

[0072] Aminopropyltriethoxysilane is commercially available, CAS number: 919-30-2.

[0073] The method for preparing recycled concrete containing lightweight rubber comprises the following steps: Step 01), put 198kg cement, 36kg fly ash, 380kg fine aggregate, 600kg coarse aggregate, 170kg modified lightweight rubber powder, 2.2kg water reducer, and 1kg retarder into a mixer, 60r / min, stir for 15min, and obtain a premix.

[0074] Step 02), add 100kg water to the premix, stir at 60r / min for 15min to obtain concrete mixture.

[0075] Step 03), inject the concrete mixture into the mold, sprinkle water for 3 days, demould, sprinkle water for 7 days, and let it stand for 28 days to obtain recycled concrete containing lightweight rubber.

[0076] Comparative Example 1 A recycled concrete containing lightweight rubber, compared with Example 2, the only difference is: In the modified liquid, isotridecanol phosphate is used to replace sodium dodecyl diphenyl ether disulfonate in an equal amount.

[0077] Isotridecyl phosphate is commercially available, CAS number: 73038-25-2.

[0078] Comparative Example 2 A recycled concrete containing lightweight rubber, compared with Example 2, the only difference is: In the modified liquid, octadecylamine polyoxyethylene ether is used to replace the sodium fatty acid methyl ester sulfonate in an equal amount.

[0079] Octadecanamine polyoxyethylene ether is commercially available, CAS number: 26635-92-7.

[0080] Comparative Example 3 A recycled concrete containing lightweight rubber, compared with Example 2, the only difference is: In the modified solution, γ-glycidyloxypropyltrimethoxysilane was used to replace aminopropyltriethoxysilane in an equal amount.

[0081] γ-Glycidyloxypropyltrimethoxysilane is commercially available, CAS number: 2530-83-8.

[0082] Comparative Example 4 A recycled concrete containing lightweight rubber, compared with Example 2, the only difference is: In the modified liquid, isotridecanol phosphate was used to replace sodium dodecyl diphenyl ether disulfonate in equal amounts; octadecylamine polyoxyethylene ether was used to replace sodium fatty acid methyl ester sulfonate in equal amounts; and γ-glycidyloxypropyl trimethoxysilane was used to replace aminopropyl triethoxysilane in equal amounts.

[0083] Isotridecyl phosphate is commercially available, CAS number: 73038-25-2.

[0084] Octadecanamine polyoxyethylene ether is commercially available, CAS number: 26635-92-7.

[0085] γ-Glycidyloxypropyltrimethoxysilane is commercially available, CAS number: 2530-83-8.

[0086] Comparative Example 5 A recycled concrete containing lightweight rubber, comprising the following components: Water, cement, fly ash, fine aggregate, coarse aggregate, lightweight rubber powder, additives.

[0087] The cement was purchased from Runfeng Cement, silicate cement, P.O42.5R.

[0088] The fly ash is sourced from commercially available, first-grade fly ash.

[0089] The fine aggregate is natural river sand, which is commercially available and has a particle size of 3-5 mm.

[0090] The coarse aggregate is basalt crushed stone, which is commercially available and has a particle size of 15-20 mm.

[0091] The additive is a compound of water reducer and retarder.

[0092] The water reducer is polycarboxylic acid water reducer, purchased from Wuhan Huaxuan High-tech Co., Ltd., model: PC-306.

[0093] The retarder is sodium gluconate, which was purchased from Hebei Laiqi Biotechnology Co., Ltd.

[0094] The preparation method of lightweight rubber powder is as follows: The waste tires are crushed and sieved to obtain lightweight rubber powder with a particle size of 0.15-0.25mm.

[0095] The method for preparing recycled concrete containing lightweight rubber comprises the following steps: Step 01), put 196kg cement, 35kg fly ash, 377.5kg fine aggregate, 597.5kg coarse aggregate, 165kg lightweight rubber powder, 2.1kg water reducer, and 0.9kg retarder into a mixer, stir at 60r / min for 15min to obtain a premix.

[0096] Step 02), add 100kg water to the premix, stir at 60r / min for 15min to obtain concrete mixture.

[0097] Step 03), inject the concrete mixture into the mold, sprinkle water for 3 days, demould, sprinkle water for 7 days, and let it stand for 28 days to obtain recycled concrete containing lightweight rubber.

[0098] Comparative Example 6 A concrete comprising the following components: Water, cement, fly ash, fine aggregate, coarse aggregate, additives.

[0099] The cement was purchased from Runfeng Cement, silicate cement, P.O42.5R.

[0100] The fly ash is sourced from commercially available, first-grade fly ash.

[0101] The fine aggregate is natural river sand, which is commercially available and has a particle size of 3-5 mm.

[0102] The coarse aggregate is basalt crushed stone, which is commercially available and has a particle size of 15-20 mm.

[0103] The additive is a compound of water reducer and retarder.

[0104] The water reducer is polycarboxylic acid water reducer, purchased from Wuhan Huaxuan High-tech Co., Ltd., model: PC-306.

[0105] The retarder is sodium gluconate, which was purchased from Hebei Laiqi Biotechnology Co., Ltd.

[0106] The method for preparing concrete comprises the following steps: Step 01), put 196kg cement, 35kg fly ash, 443.5kg fine aggregate, 696.5kg coarse aggregate, 2.1kg water reducer and 0.9kg retarder into a mixer, stir at 60r / min for 15min to obtain a premix.

[0107] Step 02), add 100kg water to the premix, stir at 60r / min for 15min to obtain concrete mixture.

[0108] Step 03), inject the concrete mixture into the mold, sprinkle water and cure for 3 days, demould, sprinkle water and cure until the 7th day, and let it stand and cure until the 28th day to obtain concrete.

[0109] Experiment 1 According to GB / T50081-2019 "Standard for Test Methods for Physical and Mechanical Properties of Concrete", the 7-day compressive strength, 28-day compressive strength, and 28-day splitting tensile strength of the test samples made of concrete in each embodiment and comparative example were tested.

[0110] The specific test data of Experiment 1 are shown in Table 1.

[0111] Table 1 According to the data comparison of each embodiment and the comparative example in Table 1, it can be obtained that the splitting tensile strength of each embodiment is significantly higher than that of each comparative example, and the compressive strength is very close to that of comparative example 6, which proves that in each embodiment, after the lightweight rubber powder is modified by using a modifying liquid prepared by mixing water, sodium dodecyl diphenyl ether disulfonate, sodium fatty acid methyl ester sulfonate, and aminopropyl triethoxysilane, the modified lightweight rubber powder is used to partially replace the fine aggregate and the coarse aggregate. The crack resistance of the concrete can be significantly improved, and the compressive strength does not decrease significantly, so that the concrete has both high strength and crack resistance, so that the concrete can be better suitable for engineering needs, and can effectively consume waste tires and reduce environmental pollution.

[0112] Although comparative examples 1-4 also modified the lightweight rubber powder, the modification liquid destroyed the combination system of sodium dodecyl diphenyl ether disulfonate, sodium fatty acid methyl ester sulfonate, and aminopropyl triethoxysilane, resulting in poor modification effect. While the splitting tensile strength of comparative examples 1-4 was improved, the compressive strength decreased significantly, which was difficult to meet the engineering requirements.

[0113] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A recycled concrete containing lightweight rubber, characterized in that: The composition includes the following components in parts by weight: 100 parts water; Cement 194-198 parts; 34-36 parts of fly ash; 375-380 parts of fine aggregate; 595-600 parts of coarse aggregate; 160-170 parts of modified lightweight rubber powder; 2.8-3.2 parts of additives; The preparation method of the modified lightweight rubber powder is as follows: Step 1), crushing and screening the waste tires to obtain lightweight rubber powder; Step 2), adding the light rubber powder into the modifying liquid for modification, filtering out the solid after the modification is completed, and drying to obtain the modified light rubber powder; The modified liquid is a compound of water, sodium dodecyl diphenyl ether disulfonate, sodium fatty acid methyl ester sulfonate and aminopropyl triethoxysilane.

2. The recycled concrete containing lightweight rubber according to claim 1, characterized in that: In the modified liquid, the mass ratio of sodium dodecyl diphenyl ether disulfonate, sodium fatty acid methyl ester sulfonate and aminopropyl triethoxysilane is 22-24:7-9:15-17.

3. The recycled concrete containing lightweight rubber according to claim 2, characterized in that: In the modified liquid, the mass ratio of water, sodium dodecyl diphenyl ether disulfonate, sodium fatty acid methyl ester sulfonate and aminopropyl triethoxysilane is 1000:22-24:7-9:15-17.

4. The recycled concrete containing lightweight rubber according to claim 1, characterized in that: In the step 1), the particle size of the lightweight rubber powder is 0.15-0.25 mm.

5. The recycled concrete containing lightweight rubber according to claim 1, characterized in that: In the step 2), the lightweight rubber powder is added to the modification liquid and stirred for 120-150 minutes to complete the modification.

6. The recycled concrete containing lightweight rubber according to claim 5, characterized in that: In the step 2), the lightweight rubber powder is added to the modification liquid, heated to a constant temperature of 45-55° C., and stirred for 120-150 minutes to complete the modification.

7. The recycled concrete containing lightweight rubber according to claim 1, characterized in that: The auxiliary agent is a compound of a water reducer and a retarder, and the mass ratio of the water reducer to the retarder is 2-2.2:0.8-1.

8. A method for preparing recycled concrete containing lightweight rubber according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 01), cement, fly ash, fine aggregate, coarse aggregate, modified lightweight rubber powder and additives are mixed evenly to obtain a premix; Step 02), adding water to the premix and stirring evenly to obtain a concrete mixture; Step 03), injecting the concrete mixture into the mold, curing and demoulding, to obtain recycled concrete containing lightweight rubber.

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