A kind of self-compacting composite concrete and preparation method thereof

Abstract

The invention discloses a self-compacting composite concrete. The concrete is prepared from the following raw materials in parts by mass: 1 part of water, 3.74-8 parts of natural coarse aggregate, 1.606 parts of recycled coarse aggregate, 5.331 parts of fine aggregate, 2.460-2.768 parts of cement, 0.308-0.615 part of steel slag, 0.342 part of rice hull ash, 0.077 part of added water, and 0.0058-0.096 part of additive. The self-compacting composite concrete has high fluidity, filling property and segregation resistance, meets building requirements in gradual loss, endurance and strength, and iseasy to prepare. The production cost of self-compacting concrete of the same strength is lowered, the steel slag and building wastes are well treated, and the pressure under resource exhaustion is relieved. The self-compacting composite concrete is environment-friendly and is suitable for industrial production. The invention further discloses a preparation method for the self-compacting compositeconcrete.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a concrete material, more specifically, to a self-compacting composite concrete 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, steel slag, recycled coarse aggregate and rice husk ash solid waste are used instead of cement, natural coarse aggregate and silica fume to prepare self-compacting concrete. Reduce the production cost of self-compacting concrete, and high-strength self-compacting concrete is a kind of high-performance concrete different from ordinary concrete. It has high fluidity and mechanical strength and does not segregate or bleed during the pouring process, and can be used without mechanical vibration Concrete filled with templates and wrapped steel bars under the action of force, and the existing technology for preparing recycled concrete and steel slag concrete cannot solve the current situation of labor shortage

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