水泥粉煤灰再生基层混合料性能的研究

Study on Performance of Cement Fly Ash Recycled Base Mixture

为了提高再生稳定碎石基层的路用性能,向集料中掺入水泥与粉煤灰比例为1∶3的结合料,展开试验研究。根据水泥稳定碎石基层配合比设计方法确定集料配合比,试验中再生骨料(10~30mm)的掺配比例依次为0%、20%、40%、60%、80%、100%,由最大干密度试验确定其相应的最佳含水量。通过无侧限抗压强度试验、劈裂强度试验、冻融循环试验进行性能分析。结果表明:再生基层混合料的无侧限抗压强度、劈裂强度都随再生骨料掺配比例的增大而增大,当再生骨料掺量为80%时达到最大值;而混合料的抗冻系数BDR随再生骨料掺量的增加逐渐减小。

In order to improve the road performance of the regenerated stabilized macadam base,a binder with a ratio of cement to fly ash of 1:3 was blended into the aggregate to study the experiment.According to the cement stabilized macadam base mix design method to determine the aggregate mix ratio,the blending ratio of the recycled aggregate(10~30mm)in the experiment is 0%,20%,40%,60%,100%,and the maximum dry density experiments determine their corresponding optimum water content.The performance analysis was carried out by the unconfined strength test,the splitting strength test,and the freeze-thaw cycle experiment.The results show that the unconfined compressive strength and splitting strength of the regenerated base mix increase with the proportion of recycled aggregate,and reach the maximum when the recycled aggregate content is 80%.The anti-freezing coefficient BDR gradually decreases with the increase of the amount of recycled aggregate.