Concrete doped with multi-component admixture and preparation method of concrete

Abstract

The invention belongs to the field of preparation of building materials, and particularly relates to concrete doped with a multi-component admixture and a preparation method of the concrete. The concrete comprises cement, the multi-component admixture, an iron tailing sand fine aggregate, natural sand, broken stones, waste stones and a water reducing agent, wherein each cubic meter of the concrete comprises 215 kg to 230 kg of the cement, 200 kg to 215 kg of the multi-component admixture, 260 kg to 300 kg of the iron tailing sand, 260 kg to 300 kg of the natural sand, 320 kg to 360 kg of the broken stones and 840 kg to 880 kg of the iron tailing sand waste stones, the multi-component admixture comprises iron tailings, desulfurized fly ash, slag, fly ash and silica fume in a weight ratio of 5: 2: 1: 0.5: 0.2; The concrete is low in cost and friendly to environment; the structure of the concrete is compact through synergistic matching and defect complementation of multiple solid wastes and aggregate grading optimization; and it is guaranteed that the solid waste mixing amount is large, and meanwhile the early strength and the later strength of the concrete are improved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a concrete mixed with multiple admixtures and a preparation method thereof. Background technique [0002] "Green high-performance concrete" is a concept first proposed by academician Wu Zhongwei in 1998, which will represent the future direction of concrete development and the only inevitable choice for concrete development. The concept of green high-performance concrete mainly includes several meanings such as effectively saving resources and energy, not destroying the existing environment, and more conducive to the sustainable development of the environment, so as to meet the development needs of contemporary and future generations. Therefore, it will be an inevitable demand for the development of green high-performance and environmentally friendly concrete to develop a large amount of accumulated solid waste into concrete raw materials. [0003] From 20...

AI Technical Summary

Problems solved by technology

In the previous studies, the research on iron tailings in the preparation of concrete mainly focused on "applied to concrete as active powder", "applied to concrete as fine aggregate" or "applied to concrete as coarse aggregate". The mixing amount is low, as the active admixture, the large amount will cause the problem of early strength decline. When the mixing amount is greater than 40%, the later strength will decrease obviously. When it is used as fine aggregate, due to the poor natural gradation, it will cause concrete strength and The problem of poor durability