大连理工大学学报Issue(6)：604-611,8.DOI:10.7511/dllgxb201406002
水泥改性强膨胀土理化试验研究
Physical-chemical experimental investigation on cement-treated highly expansive soil
摘要
Abstract
The expansive soil is a special type of clay with the engineering properties of swelling, disintegrating and softening when absorbing water and shrinkaging,desiccating and hardening when losing water.The engineering properties of expansive soil can be improved when treated with cement. The highly expansive soil in South-to-North Water Diversion Project was selected from Handan region,Hebei Province.A series of tests on the cement-treated Handan clay were carried out,mainly including the basic physical-chemical properties test,free swelling ratio test,mineralogy analysis and microstructure test by XRD,SEM test and cation exchange capacity test at different curing time over a long curing time.From different aspects,the variations of physical-chemical properties,mineralogy composite and microstructure were analyzed,and the mechanisms of cement treatment on highly expansive soil were discussed.Experimental results show that it is not reasonable to use cation exchange capacity to evaluate the swelling potential of cement-treated expansive soil.These results provide a scientific and valuable basis for design and construction of cement treatment on highly expansive soil.关键词
强膨胀土/水泥改性/自由膨胀率/一维无荷膨胀率/XRD/SEM/阳离子交换量Key words
highly expansive soil/cement treatment/free swelling ratio/one-dimensional non-load swelling ratio/XRD/SEM/cation exchange capacity分类
建筑与水利引用本文复制引用
赵春吉,赵红华,常艳,龚壁卫..水泥改性强膨胀土理化试验研究[J].大连理工大学学报,2014,(6):604-611,8.基金项目
“十二五”国家科技支撑计划资助项目(2011BAB10B05) （2011BAB10B05）
国家自然科学基金资助项目(51308091) （51308091）
归国留学人员科研启动基金资助项目 （）
