掺RAP再生水泥混凝土抗碳化性能研究

Study on Carbonization Resistance of Recycled Cement Concrete Mixed with RAP

配制了沥青路面铣刨料(RAP)掺量为20%、30%、40%、50%的RAP再生水泥混凝土,分析了R AP掺量对再生水泥混凝土抗压强度和碳化深度的影响,并与普通水泥混凝土进行了对比。结果表明:RAP的掺入会降低水泥混凝土的抗压强度,且掺量越大抗压强度降低越多;随着碳化时间的增加,R AP再生水泥混凝土的碳化深度随之增大,碳化速率随之减缓;R AP再生水泥混凝土的抗碳化性能随着RAP掺量的增大而降低;在现有碳化模型基础上,通过回归拟合得到了标准碳化条件下RAP再生水泥混凝土的碳化模型,可以较好地实现RAP再生水泥混凝土碳化发展趋势的预测。

The recycled cement concrete with RAP contents of 20%,30%,40%,and 50% is prepared to analyze the influence of RAP content on its compressive strength and carbonization depth,and to compare with the ordinary cement concrete.The results show that with the increasing content of RAP,the compressive strength of the cement concrete decreases.With the increase of the carbonization time,the carbonization depth of the RAP recycled cement concrete increases,and the carbonization rate slows down.The carbonization resistance of the RAP recycled cement concrete decreases with the increase of the RAP content.Based on the current carbonization model,the carbonization model of RAP recycled cement concrete under the standard carbonization condition is obtained by regression fitting,which can predict the carbonization developing trend of the RAP recycled cement concrete.