矿渣胶凝材料固化软土的力学性状及机制  

Mechanical behavior and mechanism of stabilizing soft soil by slag cementitious material

作　　者：张大捷[1] 田晓峰[1] 侯浩波[1] 刘浩[2] 谭石康 

机构地区：[1]武汉大学资源与环境学院,武汉430079 [2]湖北交通规划设计院,武汉430020 [3]湖北随岳中高速公路指挥部,湖北天门431700

出　　处：《岩土力学》2007年第9期1987-1991,共5页Rock and Soil Mechanics

基　　金：湖北省交通厅重点科技项目(鄂交通科教2003(570))

摘　　要：利用矿渣胶凝材料固化软土,既可利用工业废渣,又能减少水泥的用量。以矿渣胶凝材料固化黏土、砂土二种软土。发现矿渣胶凝材料加固软土的效果远好于水泥、石灰,其9%掺量的固化土28 d的无侧限强度达到2.0 MPa以上,普遍高于15%掺量的水泥固化土,且其28 d固化土的软化系数普遍高于90%以上,固化黏土后CBR值远高于同掺量的石灰固化土。X衍射结构分析表明,矿渣胶凝材料水化时产生的高强难溶的矿物晶体是其固化软土效果好的主要原因。因此,矿渣胶凝材料是一种性能优异的软土加固材料。soft soil is stabilized by slag cementitious materials,which can not only reuse industrial wastes,but also reduce amount of cement.Sandy soil and clay soil are stabilized by slag cementitious materials.Result shows that the stabilization effect of alkali-slag cementitious materials is better than cement and lime.The unconfined compressive strength of soils added 9 % slag cementitious materials after curing 28 days reaches 2.0 MPa,which are higher than soils added 15 % cement;softening coefficient of stabilized soils after curing 28 days are almost higher than 90 %;the CBR of stabilized clay soil outclasses that of the lime-clay soil with the same mixing ratio.XRD analysis shows that the high-strength,insoluble mineral produced due to hydration of slag cementitous materials is the main cause for better effect of soil.All those show that alkali-slag cementitious material is an ideal solidifying agent for soil stabilization.

关 键 词：矿渣胶凝材料 固化 软土 无侧限抗压强度 水稳定性 加洲承载比 

分 类 号：TQ172.72[化学工程—水泥工业]