再生混凝土抗碳化性能试验研究及理论分析
Experimental research and theoretical analysis on carbonation resistancebehavior of recycled aggregate concrete

通过快速碳化试验，以再生骨料掺量、水灰比、水泥用量、原始混凝土强度和矿物掺合料为影响因素，对再生混凝土的碳化性能进行研究。试验结果表明：再生混凝土的碳化深度随水灰比、再生骨料掺量的增加而减小，随原始混凝土强度的增大和水泥用量的增加而增大，适量添加矿物掺和料能降低再生混凝土的碳化深度，提升其抗碳化性能。在已有的普通混凝土碳化模型研究基础上，结合本试验和中国其他学者的试验数据，建立了再生混凝土碳化深度预测模型，模型预测结果与试验值吻合较好。
An accelerated carbonation experimental analysis on carbonation resistance behavior of recycled concrete was carried out. The influence of recycled coarse aggregate replacement ratios, water cement ratios, cement content, the strength of natural concrete and the kinds of mineral admixture on the carbonation resistance of recycled concrete was studied. The results show that the carbonation depth decreases with the increase of water cement ratios and recycled coarse aggregate replacement ratios, while it increases with the growth of strength of natural concrete and cement content.Moreover, the addition of mineral admixture replacing cement partially can also decrease the carbonation depth of recycled concrete. Based on the current prediction models of natural concrete carbonation depth, the prediction model of recycled concrete carbonation depth wasestablished through regression analysis of experimental data from this paper and the results of the model agreed well with the experimental results from other researchers in China.