Large quantities of construction and demolition(C&D)building waste are being generated as a result of rapid urbanization and natural disasters in China.An increasing awareness of environmental protection is escalating C&D waste disposal concerns.This paper presents a brief introduction to current shaking table test research in China on structures built with recycled aggregate concrete(RAC).Test structures include a cast-in situ frame model,a precast frame model and a block masonry building.The test results prove that it is feasible to use RAC as a structural material in seismic areas,with recommended modifications and proper design,especially in low-rise structures.This paper also presents several successful applications of RAC in civil and structural engineering projects in China,which will serve to promote RAC as a global ecological structural material.
This study tries to reveal the carbonation behavior when recycled coarse aggregates(RCAs) are used to mix new concrete.Six series of tests including 22 groups of recycled aggregate concrete(RAC) specimens were carried out,in which the effects of the water/binder(w/b) ratios,the binder content,the types of mineral admixture,the quality of RCAs,the RCAs replacement and the loading levels on the carbonation behavior of RAC were evaluated,respectively.The results showed that the carbonation behavior of RAC was not only influenced by the quality of new mortar but also by the properties of RCAs.The admixture of mineral admixture influenced the carbonation,and the loading stress level might have a significant impact on the evolution of the carbonation.
