C20-grade steel-slag-doped recycled aggregate self compact concrete and preparation method thereof

Abstract

The invention discloses C20-grade steel-slag-doped recycled aggregate self compact concrete and a preparation method thereof. The C20-grade steel-slag-doped recycled aggregate self compact concrete is prepared from the raw materials in mass fraction: 1 part of water, 3.089 parts of natural coarse aggregate, 1.322 parts of recycled coarse aggregate, 3.822 parts of fine aggregate, 0.970 to 1.213 parts of cement, 1.213 to 1.455 parts of steel slag, 0.609 part of coal ash, 0.064 part of added water and 0.00495 to 0.0124 part of additive. The concrete disclosed by the invention has good fluidity, filling property and segregation resistance; gradual loss and strength of the concrete both can meet relevant requirements of buildings; meanwhile, the preparation method is simple, production cost is reduced compared with self compact concrete with the same strength, the problem of processing steel slag and building rubbish is further solved, and resource exhaustion pressure is relieved; the 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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