Cementing material, all-solid waste concrete and preparation method of all-solid waste concrete

Abstract

The invention provides a cementing material, all-solid waste concrete and a preparation method thereof. The cementing material comprises the following components in percentage by mass: 25-35% of steel slag powder, 45-55% of slag powder, 10-15% of desulfurized gypsum powder and 5-10% of alkaline residue powder. According to the cementing material prepared by the preparation method disclosed by the invention, the potential hydraulic activity and "double salt effect" of silica tetrahedrons and alumina tetrahedrons in the slag powder are fully exerted by utilizing the mutual excitation effect among the alkaline residue powder, the steel slag powder, the slag powder and the desulfurized gypsum, and the cementing material capable of being hydrated and hardened is prepared. The cementing material is used for replacing cement and is mixed with waste sand, waste rock, water and a water reducing agent to prepare the all-solid waste concrete. According to the technology, 25-35% of raw material cost can be saved, the prepared concrete engineering material is excellent in mechanical property, and the compressive strength of the concrete engineering material can reach 60 MPa or above after standard curing for 28 days.

Description

technical field [0001] The invention belongs to the technical field of concrete building materials, and in particular relates to a cementitious material, all-solid waste concrete and a preparation method thereof. Background technique [0002] In the period of rapid development of modern industry, the generation of a large amount of industrial solid waste not only caused the waste of resources, but also caused the pollution of the environment. A large number of research work and application practice of steel slag, slag, fly ash and other industrial solid wastes as concrete admixtures have shown that the compounding of various admixtures can play a very good role in improving the performance of concrete in all aspects. However, in terms of the utilization scale and level of various solid wastes, the utilization rate of steel slag is generally low due to its special properties; the utilization level of slag is slightly higher, but the potential hydraulic activity of its silicon...

AI Technical Summary

Problems solved by technology

Although this method improves the utilization rate of converter steel slag to a certain extent, the cementitious material still needs to use 75-90% of slag powder and 10-25% of industrial by-product gypsum, and the raw material of steel slag cannot be used in the preparation of cementitious material. used in the process

At the same time, although this preparation method also consumes a large amount of solid waste to prepare recycled concrete, the type of solid waste involved is relatively single, and it does not include the recycling of chemical waste residues.

Further, the mechanical strength of the recycled concrete prepared by it is still not ideal enough to meet the demand for high-strength concrete in the construction industry

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