Effect of Industrial Waste Slurry Coating on the Performance of Recycled Concrete Made with Waste Incineration Bottom Ash

Abstract

We examined the mechanical strength and microscopic property effects of bottom ash (BA) recycled concrete made by partially substituting natural aggregates made from three industrial wastes, fly ash (FA), silica fume (SF), furnace slag (FS), and cement after BA was treated with slurry to improve the properties of BA and increase its utilisation. The compressive, flexural, splitting tensile strengths, and drying shrinkage test of the recycled concrete from BA were tested at the macroscopic level, and the specimens were analyzed by scanning electron microscopy (SEM) at the microscopic level. The experimental results show that the slurry treatment of BA results in a corresponding improvement in the macroscopic and microscopic properties of the obtained slurry-bound BA aggregates. The synergistic effect of FA and SF can better fill the pores on the surface of BA, which in turn can better improve the properties of recycled concrete. This study provides a theoretical support for improving the properties of BA and promoting its utilisation as a resource.

Keywords

waste incineration bottom ash / slurry coating / mechanical properties / microstructure

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