团聚体级配对固废改良膨胀土耐久性的影响  

Effect of Aggregate Grading on Durability of Expansive Soil Modified by Solid Waste

作　　者：储诚富[1] 王雨航 宗文强 CHU Chengfu;WANG Yuhang;ZONG Wenqiang(School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009

出　　处：《建筑材料学报》2024年第3期237-244,共8页Journal of Building Materials

基　　金：国家自然科学基金资助项目(42172307);安徽省自然科学基金资助项目(2008085MD118)。

摘　　要：通过工业固废改良膨胀土团聚体的搅拌破碎试验以及破碎土的耐久性试验,揭示了团聚体尺寸效应对改良效果的影响,并分析了其影响机理.结果表明:掺入铁尾矿砂和电石渣能加速土团聚体在搅拌过程中的破碎;大粒径团聚体内部膨胀土的改良效果较差,容易产生裂隙;粒径大于15 mm的团聚体含量越高,试样的耐久性越差;相对于电石渣改良土,复合改良土的耐久性更好;对于应用于底基层的电石渣改良土和复合改良土,建议控制粒径大于15 mm土团聚体的含量分别小于2.5%和21.8%.The influence of aggregate size effect on the improvement effect was revealed through the stirring and crushing test of expansive soil aggregates improved by industrial waste slag and the durability test of crushed soil,and the influence mechanism was analyzed.The results show that adding iron tailings sand and calcium carbide slag can accelerate the crushing of aggregates in the agitation process.The improvement effect of soil inside large particle size aggregates is poor,and cracks are prone to occur.The higher the content of aggregates larger than 15 mm,the poorer the durability of the samples.Compared with soil modified by calcium carbide slag,composite modified soil has better durability.For soil improved by calcium carbide slag and composite improved soil applied to the subbase layer,it is recommended to control the content of soil aggregates larger than 15 mm to be less than 2.5%and 21.8%respectively.

关 键 词：膨胀土改良 团聚体 尺寸效应 工业固废 干湿循环 

分 类 号：TU443[建筑科学—岩土工程]