ON THE CARBONATION BEHAVIOUR OF RECYCLED AGGREGATE CONCRETE
Concrete exposure to atmosphere produces changes in its internal structure, for instance loss of alkalinity of the cover concrete and the corrosion of steel rebar due to carbonation, in extreme cases risking the service life of the structure. Carbonation is one of key environmental actions that cause structure damage. This study aims to introduce new information on carbonation resistance when recycled coarse aggregates are used to make new concrete. In this paper the concretes resistance to carbonation was determined by testing the carbonation depth of 100mm×100mm×300mm concrete prisms in according with GBJ 82-85. Two series of tests including 9 groups of recycled aggregate concrete specimens were carried out in which the effects of water/cement (w/c) ratios and loading levels on the carbonation behaviour of recycled concrete were evaluated respectively. The results show that there is a linear relationship between the carbonation depth of recycled concrete and the square root of carbonation time, the carbonation depth of recycled concrete increases with increases in the w/c, loading levels have a significant impact on the propagation of the carbonation.
Carbonation environmental actions recycled aggregate concrete loading levels
J. Z. Xiao B. Lei
College of Civil Engineering, Tongji University, Shanghai, China
国际会议
上海
英文
897-904
2007-11-28（万方平台首次上网日期，不代表论文的发表时间）