Concrete recycled aggregate and preparation process thereof

Abstract

The invention discloses a concrete recycled aggregate and a preparation process thereof. The preparation process of the concrete recycled aggregate comprises the following steps: S1, crushing and six-stage screening; S2, soaking in hydrochloric acid to prepare a pretreated recycled aggregate; S3, mixing silicon dioxide, expanded graphite, bentonite and talcum powder, and mixing an obtained mixturewith water-based BOPP resin and deionized water to prepare a thermal insulation filler; S4, preparing a reinforcing filler from glass beads, calcium ion powder, glass fiber powder and acrylate; S5, performing fermentation treatment on the pretreated recycled aggregate, bacillus, quick lime and the like to obtain a fermentation product; S6, mixing the fermentation product with the crushed straw and a trimethylmethoxysilane solution, and exposing an obtained recycled aggregate to the sun; and S7, mixing the recycled aggregate with the steel slag to prepare a mixed aggregate, and then mixing themixed aggregate with an epoxy resin modified waterborne polyurethane. The concrete recycled aggregate disclosed by the invention has the advantages of low water absorption rate and small void ratio,so that the prepared concrete has high compressive strength.

Description

technical field [0001] The invention relates to the technical field of building material preparation, more specifically, it relates to a concrete recycled aggregate and a preparation process thereof. Background technique [0002] Since the beginning of the 21st century, my country has entered a stage of rapid urbanization. With the demolition and reconstruction of original buildings, a large number of construction wastes have accumulated, and the ecological environment pollution has become more and more serious. The demolition of houses, roads, bridges and other concrete buildings, as well as the waste concrete produced in the process of concrete production and construction, undergo a series of processing such as crushing, cleaning and grading, and match them in proportion to obtain recycled aggregate with a particle size below 40mm. Compared with natural aggregates, recycled aggregates have problems such as high water absorption, many fine cracks, poor durability and bondin...

AI Technical Summary

Problems solved by technology

[0004] Although the above methods have improved the strength of recycled concrete to varying degrees, because the recycled aggregate produces cracks and voids during crushing or processing, the water absorption rate of the recycled aggregate is relatively high, resulting in a decrease in the strength of the concrete, which restricts the production and regeneration of recycled aggregate. development of concrete

Images