Abstract
The recycled aggregate obtained by simple crushing and screening of waste concrete has a rough surface and many protruding edges and corners, and most of the aggregate surface is attached with old mortar, when directly used as aggregate in concrete, the water demand is large, the concrete strength and elastic modulus are low, and the durability is poor. Therefore, proper treatment of recycled aggregate is required.This article summarizes the research status of the pretreatment methods of mechanical strengthening, heating grinding, solution impregnation, cement slurry impregnation, carbonization treatment, nano-modification, microbial modification and water cleaning etc., and simply analyzes the advantages and disadvantages of various treatment methods, which provide a reference for the research of recycled aggregate processing methods.
Highlights
With the continuous development of the construction industry and the frequent occurrence of natural disasters such as earthquakes, more and more construction waste has accumulated, occupying a large amount of land resources, and causing certain pollution to the environment
Recovering sand and gravel aggregates from construction waste is the current focus of the construction industry
The recycled aggregate particles prepared by simple crushing and screening processes have rough surface and prominent edges and corners[2], the surface of the aggregate is wrapped with much old hardened cement mortar, which is the main difference between the recycled aggregate and natural aggregate[3]
Summary
With the continuous development of the construction industry and the frequent occurrence of natural disasters such as earthquakes, more and more construction waste has accumulated, occupying a large amount of land resources, and causing certain pollution to the environment. The recycled aggregate particles prepared by simple crushing and screening processes have rough surface and prominent edges and corners[2], the surface of the aggregate is wrapped with much old hardened cement mortar, which is the main difference between the recycled aggregate and natural aggregate[3]. The quantity and quality of the attached hardened old cement mortar are the main factors affecting the physical properties of recycled aggregates[4], the old cement mortar has a porous micro-structure and many
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