DAMAGE MECHANISM OF CONCRETE WITH RECYCLED BRICK AGGREGATE

Abstract

WIt has great environmental potential to replace natural aggregates by recycled brick aggregates. To investigate the deterioration mechanism of recycled brick ag-gregate concrete, this paper designed eight groups of recycled brick aggregate sub-lightweight concrete with different water-cement ratios, maximum aggregate sizes and coarse aggregate type ratios, and carried out mechanical property test to analyze the aggregate interface characteristics and the damage mechanism of re-cycled brick aggregate concrete. The results show that the increase of replacement ratio and water-cement ratio leads to a significant decrease of compressive strength and splitting tensile strength of concrete, and the influence of the maxi-mum aggregate size on strength is small. Unlike the recycled concrete aggregate – mortar interface, the microstructure of recycled brick aggregate – mortar interface is dense and the interface performance is enhanced. Recycled brick aggregate con-crete is in non-interface damage mode, and the strength of brick aggregate is the main influence to determine the mechanical properties of concrete factor.