Process for recycling waste concrete aggregate and cementing material

Abstract

The invention relates to a process for recycling waste concrete aggregate and a cementing material and belongs to the technical field of concrete waste. The process includes: 1), separating through anexternal-circulation vertical mill: adopting the external-circulation vertical mill to process waste concrete to realize separation of aggregate and cement hydrate; 2), performing combined separatingpowder selection: adopting a static powder selector and a dynamic powder selector for separating powder selection, using the static powder selector to separate coarse aggregate and powder after goingthrough the external-circulation vertical mill, and using the dynamic powder selector to separate coarse powder and fine powder; 3), using an eccentric vibromill to correct circularity of aggregate selected out by the static powder selection and to further remove the cementing material attacked on the surface of the aggregate; 4), grading and washing: grading and washing the aggregate after beingtreated by the eccentric vibromill through a grading sieve to obtain coarse aggregate and fine aggregate. By the process, the aggregate and the cement hydrate are recycled to maximum extent, and an environment-friendly idea of cyclic utilization is realized.

Description

Technical field [0001] The invention belongs to the technical field of concrete garbage, and particularly relates to a process for recycling waste concrete aggregates and cementitious materials. Background technique [0002] Construction solid waste refers to the waste generated in the process of building demolition, maintenance, and construction. It mainly includes waste concrete, broken bricks and tiles, waste steel bars, waste bamboo, waste glass, waste soil, waste asphalt, etc. Construction solid waste is the main component of urban waste, accounting for about 30-40% of urban waste; waste concrete accounts for 10%-60% of construction solid waste, and the amount to be treated is huge every year. [0003] Waste concrete treatment technology has three methods: low-grade utilization, medium-grade utilization and high-grade utilization. [0004] (1) Low-level use [0005] The low-grade waste concrete is used as landfill. After the waste concrete is crushed and screened, it can be dire...

AI Technical Summary

Problems solved by technology

However, there is still a certain gap between the durability and chloride ion penetration resistance of recycled concrete materials compared with ordinary concrete with the same raw materials and the same proportion, and the comprehensive application is still in the exploratory stage.

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