Abstract

In this study, it is aimed to investigate the influence of axial compressive stress on the carbonation resistance of recycled coarse aggregate concrete (RAC). The test variables are compressive stress ratios and carbonization ages. The compressive stress ratios of RAC are 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7 and the carbonization ages are 3, 7, 14, 28 days, respectively. The test results show that the carbonation depth of RAC decreases first and then increases with the increase of the compressive stress ratio, and the carbonation depth increases with the increase of the carbonization age. The prediction model of carbonation depth of RAC under axial compressive stress is established based on theoretical analysis and experimental results.

摘要

本研究旨在研究轴向压应力对再生粗骨料混凝土（RAC）抗碳化能力的影响。测试变量是压缩应力比和碳化年龄。RAC的压应力比分别为0、0.1、0.2、0.3、0.4、0.5、0.6、0.7，碳化年龄分别为3、7、14、28天。试验结果表明，随着压应力比的增大，RAC的碳化深度先减小后增大，并且随着碳化年龄的增加，碳化深度增大。在理论分析和实验结果的基础上，建立了RAC在轴向压应力作用下碳化深度的预测模型。