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C40-grade steel slag sand self-compacting concrete and preparation method and prefabricated component thereof

A technology of self-compacting concrete and steel slag sand, which is applied in the field of building materials, can solve the problems of no good utilization of waste steel slag, difficulty in recycling, and reduction of metal components, etc., and achieve excellent homogeneity, meet strength requirements, and good compactness.

Inactive Publication Date: 2017-10-27
JIANGSU UNIV OF SCI & TECH IND TECH RES INST OF ZHANGJIAGANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Steel slag is currently crushed, screened, and magnetically separated to recover the metals in it. After the metal is recovered, the metal components in the steel slag are greatly reduced. It is currently difficult to recycle and become waste steel slag
[0004] Waste steel slag does not have a good utilization method at present, so the present invention comes

Method used

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  • C40-grade steel slag sand self-compacting concrete and preparation method and prefabricated component thereof
  • C40-grade steel slag sand self-compacting concrete and preparation method and prefabricated component thereof
  • C40-grade steel slag sand self-compacting concrete and preparation method and prefabricated component thereof

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preparation example Construction

[0079] The present invention also relates to a method for preparing C40 grade self-compacting concrete, comprising the following steps:

[0080] (1) Sorting, crushing and screening the waste concrete in the construction waste, sieving out the particles smaller than 9.50mm and larger than 20mm, and processing the aggregate particle size in the range of 10mm to 20mm to make recycled coarse aggregate ;

[0081] (2) In order to prevent sticking to the pot, weigh an appropriate amount of each material, mix concrete, wait until the inner wall of the mixer is glued with cement mortar, take out the concrete, and weigh material A, recycled coarse aggregate, natural coarse aggregate, water, powder Coal ash, feed in the order of recycled coarse aggregate, natural coarse aggregate, material A, and fly ash, then start the mixer and dry mix for 1-10 minutes;

[0082] (3) Add the weighed water and additional water, and continue to stir for 1-10 minutes.

[0083] Glossary

[0084] The ceme...

Embodiment 1～16

[0096] (1) Prepare raw materials:

[0097] Cement: P O42.5 ordinary Portland cement, apparent density is 3.10g / cm 3 .

[0098] Fly ash: Class I fly ash, apparent density 2.04g / cm 3 .

[0099] Glass beads: purchased from outside, with a density of 0.1-0.25g / cm 3 .

[0100] Sand: medium sand with a fineness modulus of 2.36 and an apparent density of 2.65g / cm 3 , bulk density is 1.45g / cm 3 , The moisture content is 0.4%.

[0101] Natural coarse aggregate: crushed stone with a continuous particle size of 5-20mm, and an apparent density of 2.75g / cm 3 , bulk density is 1.35g / cm 3 , The water absorption rate is 0.45%.

[0102] Regenerated coarse aggregate: After sorting, crushing and screening waste concrete in construction waste, and sieving out particles smaller than 9.50mm and larger than 20mm, the aggregate particle size is processed into recycled coarse aggregate with a particle size of 10mm to 20mm Aggregate, the apparent density is 2.35g / cm 3 , bulk density is 1.23g...

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Abstract

The invention provides C40-grade steel slag sand self-compacting concrete, wherein the water-binder ratio is controlled between 0.3 and 0.7; the C40-grade steel slag sand self-compacting concrete is prepared from the following components in parts by weight: 2-10 parts of steel slag sand, 2-10 parts of glass beads, 2-10 parts of cement, 7-10 parts of natural coarse aggregates, 2-6 parts of recycled coarse aggregates, 2-10 parts of sand, 0.5-1.1 parts of coal ash and 2-10 parts of water. The obtained self-compacting concrete has good mobility, gap passing ability and segregation resistance, and meets the strength requirements. The production cost of the concrete is reduced while construction is facilitated, and the preparation method is simple and suitable for industrial production.

Description

technical field [0001] The application relates to the technical field of building materials, particularly the technical field of novel self-compacting concrete, and specifically relates to a preparation method and application of C40 grade steel slag sand self-compacting concrete and C40 grade steel slag sand self-compacting concrete. 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, and can completely fill the formwork even if there are dense steel bars, and at the same time 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 flu...

Claims

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Application Information

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IPC IPC(8): C04B38/08C04B28/04
CPCC04B28/04C04B2111/40C04B2201/50C04B18/08C04B18/142C04B18/167C04B14/02C04B14/06C04B14/24C04B2103/302C04B38/08
Inventor 王静芳江飞飞卞梁潘荣楠石辉蔡梦帆
Owner JIANGSU UNIV OF SCI & TECH IND TECH RES INST OF ZHANGJIAGANG
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