建筑固废再生料作为路基工程填料的性能研究与应用

Performance Study and Application of Filling Material for Roadbed Engineering of Construction Solid Waste Recycled Material

为了提高建筑固废再生料的利用率,缓解资源短缺的问题,对建筑固废再生料的空隙率、压碎值、轻质杂物含量等基本性质进行了试验;分别对粗细再生料进行分级,并通过击实试验、承载比试验、回弹模量试验、冻胀试验和冻融循环试验对建筑固废再生料的最大干密度、承载力、抗冻性等进行了综合评价。研究结果表明:随着细集料数量的增加,再生料的最大干密度和承载力增大,最佳含水量先增加后减少;粗∶细=3∶7时,再生料的回弹模量最小,粗∶细=5∶5时,再生料的回弹模量达到峰值;当含水率为15.7%、压实度为93%时再生料的冻胀率最大,当含水率为13.4%、压实度为90%时再生料的冻胀率最小;水中冻融循环的压碎值明显高于常温下冻融循环的压碎值。

In order to improve the utilization rate of construction solid waste recycled materials to solve the problem of environmental alleviation resource shortage,the basic properties of void ratio,crushing value and light debris content of construction solid waste recycled materials were tested in this paper.The coarse and fine recycled materials were classified respectively.The compaction test,California bearing ratio(CBR)test,resilience modulus test,frost heave test and freeze-thaw cycle test were made to conduct a comprehensive evaluation of the maximum dry density,bearing capacity and frost resistance,etc.The research results show that the maximum dry density and bearing capacity of the recycled material increase,and the optimal moisture content first increases and then decreases with the increase of fine aggregate;When the ratio of coarse to fine aggregates is 3:7,the resilience modulus of the recycled material is the smallest.When the ratio of coarse to fine aggregates is 5:5,the resilience modulus reaches the peak;When the moisture content of the recycled material is 15.7%and the compaction degree is 93%,the frost heave rate is the largest.When the moisture content is 13.4%and the compaction degree is 90%,the frost heave rate is the smallest;The crushing value of the freeze-thaw cycle in water is significantly higher than that at normal temperature.