固废材料固化路基土的强度与耐久性研究

Research on Strength and Durability of Roadbed Soil Solidified by Solid Waste Materials

为开发一种新的水泥替代品,实现降低施工成本、发展绿色经济的作用,以省道S308项目为依托,设计了无侧限抗压强度试验与干湿循环试验,探究了电石渣与粉煤灰两种工业固体废弃物对线路粉质黏土固化后的强度发育与耐久性,得到主要结论如下:①随着养护时间提升,电石渣固化土无侧限抗压强度提升,电石渣最优掺量为干土质量的10%;②10%与15%掺量电石渣固化土具有一定抵抗干湿循环的能力,而5%掺量电石渣固化土在6次干湿循环后强度已基本丧失;③随着粉煤灰的掺入,电石渣固化土体系强度明显增高,粉煤灰掺量在20%附近时达到最优,这是由于粉煤灰的加入使得体系变得密实,且形成了一定的胶凝材料。

In order to develop a new alternative to cement,reduce construction costs and develop a green economy,based on the provincial highway S308 project,an unconfined compressive strength test and a dry and wet cycle test were designed to investigate the strength development and durability of two industrial solid wastes,calcium carbide slag and fly ash,on the cured pulverized clay soil of the line,and the main conclusions were as follows:①with the increase in maintenance time,the unconfined compressive strength of calcium carbide slag;②the 10%and 15%dosing of calcium carbide slag cured soil has a certain resistance to wet and dry cycles,while the 5%dosing of calcium carbide slag cured soil has basically lost its strength after six wet and dry cycles;③with the incorporation of fly ash,the strength of calcium carbide slag cured soil system increased significantly,with the fly ash dosing near 20%reaching This is due to the fact that the addition of fly ash makes the system dense and forms a certain amount of cementing material.