C20-level self-compacting concrete with steel slag and recycled aggregates and preparation method of C20-level self-compacting concrete

Abstract

The invention discloses C20-level self-compacting concrete with steel slag and recycled aggregates and a preparation method of the C20-level self-compacting concrete. The C20-level self-compacting concrete with the steel slag and the recycled aggregates is prepared from raw materials in parts by mass as follows: 1 part of water, 3.089 parts of natural coarse aggregates, 1.322 parts of recycled coarse aggregates, 3.822 parts of fine aggregates, 0.970-1.213 parts of cement, 1.213-1.455 parts of the steel slag, 0.609 parts of fly ash, 0.064 parts of added water and 0.00495-0.0124 parts of an additive. The concrete has good liquidity, filling performance and segregation resistance, gradual loss and strength both meet related requirements of buildings, meanwhile, the preparation method is simple, the production cost of self-compacting concrete with the same strength on year-on-year basis is reduced, the problem about treatment of the steel slag and building waste is solved, pressure of resource exhaustion is relieved, and the C20-level self-compacting concrete is green, environment-friendly and suitable for industrial production.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a C20 grade self-compacting concrete mixed with steel slag recycled aggregate and a preparation method thereof. Background technique [0002] Self-compacting concrete (Self Compacting Concrete or Self-Consolidating Concrete referred to as SCC) refers to relying on self-gravity without additional mechanical vibration force, it can have sufficient flow and deformation capacity, even if there are dense steel bars, it can fill the formwork space and Form dense and uniform concrete. The preparation of self-compacting concrete generally reduces the yield stress of the concrete enough to be overcome by the shear stress generated by its own weight through the selection and matching of admixtures, cementitious materials, coarse and fine aggregates, and careful mix ratio design, so that the fluidity of the concrete increases. At the same time, it has enough plastic viscosity to...

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Problems solved by technology

Although the self-compacting concrete prepared at present meets the construction and strength requirements, the cost is relatively high. Therefore, the dual solid waste of steel slag and recycled coarse aggregate is used instead of cement and natural coarse aggregate to prepare self-compacting concrete, which can reduce the production of self-compacting concrete. cost, and self-compacting concrete is a kind of high-performance concrete different from ordinary concrete. It has high fluidity and does not segregate or bleed during the pouring process. It can be filled with formwork and wrapped steel bars without mechanical vibration force. Concrete, while the existing technologies for preparing recycled concrete and steel slag concrete cannot solve the current situation of labor shortage

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