Stabilization Mechanism of Calcium Lignosulphonate Used in Expansion Sensitive Soil  

作　　者：WU Dajiang SHE Weil WEI Luansu ZUO Wenqiang' HU Xiangyu HONG Jinxiang MIAO Changwen 吴大江;佘伟;WEI Luansu;ZUO Wenqiang;HU Xiangyu;HONG Jinxiang;MIAO Changwen(Jiangsu Key Laboratory fo r Construction Materials,Southeast University,Nanjing 211189,China;Sobute New Materials Co.Ltd,Nanjing 211103,China)

机构地区：[1]Jiangsu Key Laboratory for Construction Materials,Southeast University,Nanjing 211189,China [2]Sobute New Materials Co.Lld,Nanjing 211103.China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2020年第5期847-855,共9页武汉理工大学学报（材料科学英文版）

基　　金：Funded by National Natural Science Foundation of China(Nos.51890904 and 51508090);National Key Technology R&D Program of China(No.2017YFB0309904);the National Basic Research Program of China(973 Program)(No.2015CB655100)。

摘　　要：A series of tests were performed to investigate the macroscopic properties and the stabilization mechanism of calcium lignosulphonate modified expansive soil.Compared with natural soil,soil modified by 4%calcium lignosulphonate showed 56.5%increased 28 days unconfined compressive strength and 23.8%decreased free expansion rate.The X-ray diffraction analysis results indicate the existence of cation exchange and the reduction of montmorillonite interplanar spacing.The X-computed tomography results demonstrate that calcium lignosulphonate decreased the porosity and optimized the pore distribution.The calcium lignosulphonate also increased the stability of the suspension system according to the Zeta potential results.Moreover,the results of rheological tests show that the moderate amount of calcium lignosulphonate enhanced the yield stress and the plastic viscosity,proving the formation of a strong connection between soil particles.

关 键 词：calcium lignosulphonate expansive soil mechanical characteristic stabilization mechanism 

分 类 号：TU443[建筑科学—岩土工程] S152[建筑科学—土工工程]