Self-compacting concrete prepared from industrial solid wastes and preparation method thereof

Abstract

The invention belongs to building materials and especially relates to self-compacting concrete prepared from industrial solid wastes and a preparation method thereof. Single unit of the concrete including: a powder material accounting for 16-23% by absolute volume, coarse aggregate accounting for 28-35% by absolute volume, fine aggregate accounting for 23-38% by absolute volume and water accounting for 15-19% by absolute volume, wherein the solid substances in a concrete additive agent accounts for 0.05-0.5% by the mass of the powder material. The powder material is composed of following raw materials, by mass: 30-65% of phosphogypsum, 30-55% of ore slag powder, 2-10% of steel slag powder, 0-5% of Portland cement, 0-25% of limestone powder and 0-30% of fly ash. In the invention, the preparation method includes following steps: preparing modified phosphogypsum slurry in a wet-grinding manner, and preparing clear slurry, a mortar and the self-compacting concrete, which can satisfy requirements of flowing property and segregation resistant performance, according to the sequence from the clear slurry, the mortar to the self-compacting concrete in a step-by-step manner. The self-compacting concrete is high in flowing property and segregation resistant performance. The self-compacting concrete is low-carbon and low-cost and can consume the industrial solid waste, phosphogypsum, so that the self-compacting concrete is beneficial to environmental protection.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a self-compacting concrete utilizing industrial solid waste and a preparation method thereof. Background technique [0002] Phosphogypsum is a by-product of phosphoric acid production in the phosphate fertilizer industry. At the current production level in China, 5 tons of phosphogypsum are produced for every ton of phosphoric acid produced. The main component of phosphogypsum is calcium sulfate dihydrate (CaSO 4 2H 2 O), containing soluble impurities such as phosphoric acid and fluoride, and phosphogypsum in some places of origin also contains radioactive elements such as radium. At present, the utilization rate of phosphogypsum in our country is low, and the economic benefit of reusing phosphogypsum is low. Most of the phosphogypsum is disposed of in the form of piles. During the stacking process, phosphogypsum not only occupies a large amount of land, but also pollutes soi...

AI Technical Summary

Problems solved by technology

[0006] The existing concrete using solid waste such as phosphogypsum cannot meet the requirements of self-compacting concrete performance. According to the "Technical Regulations for the Application of Self-compacting Concrete" CECS 203:2006, self-compacting concrete generally requires a slump expansion of 600mm to 700mm. V funnel passing time 5s~25s

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