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C40-level high-volume solid waste concrete and preparation method thereof

A technology of waste concrete and large dosage, applied in the field of comprehensive utilization of solid waste and building materials, can solve the problems of many micro-cracks and low strength, and achieve the effect of alleviating extreme shortage, reducing production cost and improving the level of resource utilization.

Active Publication Date: 2019-03-08
SHANGHAI RES INST OF BUILDING SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with natural aggregate, recycled aggregate has more microcracks and lower strength, and the strength of the prepared recycled concrete is generally lower than that of ordinary concrete, so the strength of recycled concrete is mostly C20-C30

Method used

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  • C40-level high-volume solid waste concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～7

[0042] The raw materials for preparing C40 grade large-volume solid waste concrete in Examples 1 to 7 below include: cement, composite admixture, 341 to 367 parts of natural sand, reinforced recycled coarse aggregate, water, polycarboxylate water reducer or composite water reducer. Water agent, one or two mixtures of tailings machine-made sand and recycled fine aggregate; where:

[0043] The cement is P·O42.5 ordinary Portland cement.

[0044] The composite admixture is composed of steel slag, fly ash and mineral powder. According to the total weight of the composite admixture is 100 parts, the steel slag is 8-20 parts, the fly ash is 50-60 parts, and the mineral powder is 30 to 40 copies; of which:

[0045] Steel slag specific surface area > 500cm 2 / g, 28d strength activity index is not less than 85%, via specific surface area 2 / g of steel slag powder mixed with 10% desulfurized gypsum or semi-hydrated desulfurized gypsum for 30 minutes; the desulfurized gypsum is a desul...

Embodiment 1

[0056] per m 3 Concrete contains the following substances in parts by weight:

[0057] P·O4 2.5 cement 213kg, composite admixture (steel slag: fly ash: mineral powder = 1:5:4) 213kg, tailings machine-made sand 313kg, natural sand 364kg, reinforced recycled coarse aggregate (regenerated coarse aggregate After soaking in water glass with a mass concentration of 3% and a modulus of 3.2 for 10 minutes), 1105kg, 4.46kg of polycarboxylate superplasticizer, and 189kg of water.

Embodiment 2

[0059] per m 3 Concrete contains the following substances in parts by weight:

[0060] P·O4 2.5 cement 213kg, composite admixture (steel slag: fly ash: mineral powder = 1:5:4) 213kg, natural sand 364kg, recycled aggregate 313kg, reinforced recycled coarse aggregate (regenerated coarse aggregate Water glass with a mass concentration of 3% and a modulus of 3.2 (soaked for 10 minutes) 1105kg, composite water reducing agent 8.95kg, and water 195kg.

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Abstract

The invention discloses a C40-level high-volume solid waste concrete and a preparation method thereof. Each m<3> of concrete comprises the following components in parts by weight (kg): 213-258 parts of cement, 213-258 parts of a composite admixture, 341-367 parts of natural sand, 1048-1105 parts of strengthened recycled coarse aggregates, 170-195 parts of water, one of 0.01-5.68 parts of a polycarboxylic acid water reducing agent and 0.01-9.24 parts of a composite water reducing agent, and one or a mixture of two selected from 1-313 parts of tailings mechanism sand and 1-313 parts of recycledfine aggregates; and the concrete has a slump of 160-200 mm. The 28d strength of the above concrete is above 40 MPa or more, the durability is high, and the solid waste volume of solid waste such as construction waste is up to 70%, so that the resource utilization level of construction waste is greatly improved, the current shortage of natural sand and gravel aggregates is alleviated, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of solid waste comprehensive utilization and building materials, and in particular relates to a C40 grade large-volume solid waste concrete and a preparation method thereof. Background technique [0002] Since 2016, the supply of natural sand and gravel aggregates has been in short supply, and the price has continued to rise. Only in 2017, the price of natural sand and gravel rose by more than 40%. It can promote the level of resource utilization of construction waste, and at the same time, recycled aggregate has certain advantages in price, which can save construction project costs and have significant economic benefits. However, compared with natural aggregate, recycled aggregate has more microcracks and lower strength, and the strength of the prepared recycled concrete is generally lower than that of ordinary concrete, so the strength of recycled concrete is mostly C20-C30. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02C04B20/10C04B111/76C04B111/94
CPCC04B20/1022C04B28/02C04B2111/00293C04B2111/76C04B2111/94C04B2201/50C04B18/141C04B18/08C04B18/12C04B14/06C04B18/16C04B2103/302
Inventor 钱耀丽杨利香樊钧王琼欧阳瑞李阳韩云婷樊俊江朱盛胜
Owner SHANGHAI RES INST OF BUILDING SCI CO LTD
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