水泥改良察尔汗超氯盐渍土强度试验研究  

Experimental Research on Strength of the Cement Stabilized Qarhan Over-chlorine Saline Soil

作　　者：王运周 李植淮 李连友 杨建国[3] 

机构地区：[1]甘肃交通职业技术学院,兰州市730070 [2]中国路桥工程有限责任公司,北京市100011 [3]交通运输部科学研究院,北京市100029

出　　处：《公路》2016年第4期14-18,共5页Highway

基　　金：交通运输部科技项目;项目编号2013318J01100

摘　　要：采用水泥作为改良剂对含盐量、含氯量很高的察尔汗超氯盐渍土进行改良试验,对改良土进行无侧限抗压强度、耐久性和扫描电子显微镜(SEM)测试,通过强度、耐久性及微观结构对比分析,探讨水泥改良超氯盐渍土的可行性及最优掺入比。试验结果表明:28d龄期下,随着水泥掺入量的增加,水泥改良超氯盐渍土的强度增强,水泥掺量15%是较优的改良掺入比;随着水泥掺量的增加,水泥改良超氯盐渍土的耐卤水腐蚀性能增强,耐久性提高。从微观结构分析可知,水泥改良的超氯盐渍土颗粒被水泥水化生成的水化物黏结联合而产生强度;水泥改良土长期浸泡于卤水后,卤水中的大量盐离子渗透进入改良土微结构内结晶并产生结晶应力使改良土已黏结结构发生破坏,最终导致改良土强度的降低,且浸泡时间越长强度下降越多。Based on the unconfined compressive strength,durability and scanning electron microscopy（SEM）test of high salinity and high chlorinity of the Qarhan over-chlorine saline soil stabilized by cement,the feasibility and optimal mixing ratio of cement stabilized soil are studied.The test results show that along with the increase of mixing ratio of cement,the 28 dstrength of cement stabilized saline soil is increasing,and the optimal mixing ratio of cement is 15%;and along with the increase of mixing ratio of cement,the stabilized soil′s durability and performance of resistance to brine corrosion are also enhancing.The microstructure of cement stabilized over-chlorine saline soil shows that the strength of stabilized soil is produced by the hydration hydrate of cement which could bond the soil particles;and the stabilized soil which is long-term soaked in brine,there have a lot of salt ions infiltrating into the soil microstructure and forming crystals which could damage the bonding structure,eventually reducing the soil′s strength,and when the soaking time is longer,the strength of stabilized soil is decreasing more.

关 键 词：水泥 超氯盐渍土 改良土 强度 

分 类 号：U419.5[交通运输工程—道路与铁道工程]