炉渣-矿渣-电石渣复配稳定特殊土在路基中的应用研究

Research on Application of Cinder-Slag-Carbide Dreg Composite Stabilized Special Soil in Highway Subgrade

为验证工业废渣复配后用于公路特殊土路基中的可行性,以新疆S21线阿勒泰至乌鲁木齐高速公路项目为依托,在分析工业废渣特性基础上,确定各渣体(矿渣、炉渣、电石渣)最优组成比例,并对三渣稳定特殊土的配伍性和强度进行验证。试验结果表明:矿渣和电石渣中化学成分以CaO、SiO_(2)为主,占比约为70%,而炉渣中各化学成分含量基本相当,占比在10%~30%之间;矿渣∶炉渣∶电石渣配比为8∶3∶4时,三渣稳定粉粘土抗压强度最佳;在其最佳含水率为14.1%、最大干密度为1.89 g/cm^(3)时,测得三渣稳定粉粘土试件的CBR值均大于30%、回弹模量均大于200 MPa,远超规范要求,满足公路路基填筑要求,证明其可用于路基施工。

In order to verify the possibility of industrial waste compound applied in highway special soil subgrade,the optimal composition of each slag body(cinder dreg,slag dreg and carbide dreg)is determined,based on the analysis of the characteristics of industrial waste slag on the project of Xinjiang S21 Altay Urumqi Expressway.The compatibility and strength of three dreg stabilized special soil are verified.The test results show that CaO and SiO_(2) are the main chemical components in slag and carbide slag,accounting for about 70%,while the chemical components in slag are basically the same,accounting for 10%~30%.When mineral slag∶slag∶carbide slag is 8∶3∶4,the compressive strength of three-slag-stabilized silty clay is the best.When the optimum moisture content is 14.1%and the maximum dry density is 1.89 g/cm^(3),the measured CBR values and Modulus Resilience of the three-slag-stabilized silty clay samples are more than 30%and 200 MPa,which is far exceeding the requirements of specification and meeting the requirements of subgrade filling.It proves to be used for subgrade construction.