Recycled self-compacting concrete and preparation method thereof

Abstract

The invention discloses recycled self-compacting concrete and a preparation method thereof. The recycled self-compacting concrete comprises the following components in parts by weight: 220 to 260 parts of cement, 160 to 190 parts of water, 780 to 800 parts of broken stone, 150 to 158 parts of a recycled material, 80 to 85 parts of mineral powder, 10 to 14 parts of an expanding agent, 720 to 750 parts of sand, 3 to 7 parts of a water reducer, 2 to 10 parts of a viscosity modifier and 110 to 117 parts of coal ash; and the recycled material comprises the following components in parts by weight: 20 to 40 parts of iron tailings, 10 to 20 parts of building waste and 20 to 30 parts of steel slag powder. The recycled self-compacting concrete disclosed by the invention has the advantages of high flowing property, filling property and segregation resistance, and the wastes of steel slag and iron tailings are utilized sufficiently.

Description

technical field

[0001] The invention relates to the technical field of concrete, more specifically, it relates to a recycled self-compacting concrete and a preparation method thereof. Background technique

[0002] Self-compacting concrete (Self-Consolidating Concrete referred to as SCC) refers to the concrete that can flow and compact under its own gravity, even if there are dense steel bars, it can completely fill the formwork, obtain good homogeneity, and do not require additional vibration. The preparation of self-compacting concrete is generally through the selection and matching of admixtures, cementing materials, coarse and fine aggregates, and a reasonable mix ratio design, so that the yield stress of the concrete is reduced enough to be overcome by the shear stress due to its own weight, and the fluidity of the concrete is increased. At the same time, it has enough plastic viscosity to suspend the aggregate in the cement slurry without segregation and bleeding proble...

Examples

preparation example 1-3

[0042] In the following preparation example, the polypropylene fiber is selected from the polypropylene fiber whose article number is JBX04 sold by Hebei Shenpeng Chemical Co., Ltd., and the epoxy resin is selected from the E-20 epoxy resin sold by Shenzhen Yoshida Chemical Co., Ltd., and the polyacrylamide is selected from Renqiu Shuoda Chemical Co., Ltd. sells polyacrylamide model SD-1200.

preparation example 1

[0043] Preparation Example 1: Heat 5kg of epoxy resin to 140°C, add 10kg of construction waste and 10kg of steel slag powder, mix thoroughly, place in an environment of 40°C for drying, and pulverize into powder, mix the powder with 20kg of iron tailings, 10kg of hollow Mix glass microspheres and 2kg polypropylene fiber evenly, add to 10kg polyacrylamide emulsion, stir evenly, and dry at 45°C; the particle size of iron tailings is 5mm, and the bulk density is 1500kg / m 3 , the apparent density is 2500kg / m 3 , the steel slag powder has an apparent density of 450m after iron removal, crushing, ball milling, and screening 2 / kg steel slag powder, polyacrylamide emulsion is made by mixing polyacrylamide and water with a mass ratio of 1:30, the particle size of hollow glass microspheres is 15μm, and the density is 0.1g / cm 3 , The average particle size of construction waste ≤ 2mm.

[0044] The raw material ratio of recycled material in table 1 preparation example 1-3

[0045]

preparation example 2

[0046] Preparation Example 2: According to the ratio in Table 1, heat 8kg of epoxy resin to 145°C, add 15kg of construction waste and 13kg of steel slag powder, mix thoroughly, place in an environment of 5°C for drying, and pulverize into powder, and mix the powder with 30kg of iron tailings, 13kg of hollow glass microspheres, and 4kg of polypropylene fibers were mixed evenly, added to 13kg of polyacrylamide emulsion, stirred evenly, and dried at 48°C; the particle size of the iron tailings was 8mm, and the bulk density was 1650kg / m 3 , the apparent density is 2800kg / m 3 , the steel slag powder has an apparent density of 500m after iron removal, crushing, ball milling, and screening 2 / kg steel slag powder, polyacrylamide emulsion is made by mixing polyacrylamide and water with a mass ratio of 1:40, the particle size of hollow glass microspheres is 23μm, and the density is 0.1g / cm 3 , The average particle size of construction waste ≤ 2mm.

technical field

[0001] The invention relates to the technical field of concrete, more specifically, it relates to a recycled self-compacting concrete and a preparation method thereof. Background technique

[0002] Self-compacting concrete (Self-Consolidating Concrete referred to as SCC) refers to the concrete that can flow and compact under its own gravity, even if there are dense steel bars, it can completely fill the formwork, obtain good homogeneity, and do not require additional vibration. The preparation of self-compacting concrete is generally through the selection and matching of admixtures, cementing materials, coarse and fine aggregates, and a reasonable mix ratio design, so that the yield stress of the concrete is reduced enough to be overcome by the shear stress due to its own weight, and the fluidity of the concrete is increased. At the same time, it has enough plastic viscosity to suspend the aggregate in the cement slurry without segregation and bleeding proble...

Examples

preparation example 1-3

[0042] In the following preparation example, the polypropylene fiber is selected from the polypropylene fiber whose article number is JBX04 sold by Hebei Shenpeng Chemical Co., Ltd., and the epoxy resin is selected from the E-20 epoxy resin sold by Shenzhen Yoshida Chemical Co., Ltd., and the polyacrylamide is selected from Renqiu Shuoda Chemical Co., Ltd. sells polyacrylamide model SD-1200.

preparation example 1

[0043] Preparation Example 1: Heat 5kg of epoxy resin to 140°C, add 10kg of construction waste and 10kg of steel slag powder, mix thoroughly, place in an environment of 40°C for drying, and pulverize into powder, mix the powder with 20kg of iron tailings, 10kg of hollow Mix glass microspheres and 2kg polypropylene fiber evenly, add to 10kg polyacrylamide emulsion, stir evenly, and dry at 45°C; the particle size of iron tailings is 5mm, and the bulk density is 1500kg / m 3 , the apparent density is 2500kg / m 3 , the steel slag powder has an apparent density of 450m after iron removal, crushing, ball milling, and screening 2 / kg steel slag powder, polyacrylamide emulsion is made by mixing polyacrylamide and water with a mass ratio of 1:30, the particle size of hollow glass microspheres is 15μm, and the density is 0.1g / cm 3 , The average particle size of construction waste ≤ 2mm.

[0044] The raw material ratio of recycled material in table 1 preparation example 1-3

[0045]

preparation example 2

[0046] Preparation Example 2: According to the ratio in Table 1, heat 8kg of epoxy resin to 145°C, add 15kg of construction waste and 13kg of steel slag powder, mix thoroughly, place in an environment of 5°C for drying, and pulverize into powder, and mix the powder with 30kg of iron tailings, 13kg of hollow glass microspheres, and 4kg of polypropylene fibers were mixed evenly, added to 13kg of polyacrylamide emulsion, stirred evenly, and dried at 48°C; the particle size of the iron tailings was 8mm, and the bulk density was 1650kg / m 3 , the apparent density is 2800kg / m 3 , the steel slag powder has an apparent density of 500m after iron removal, crushing, ball milling, and screening 2 / kg steel slag powder, polyacrylamide emulsion is made by mixing polyacrylamide and water with a mass ratio of 1:40, the particle size of hollow glass microspheres is 23μm, and the density is 0.1g / cm 3 , The average particle size of construction waste ≤ 2mm.

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