Abstract：The expansive soils have the tendency to expand in wetting and to shrink in drying. The addition of cement is one of the methods to enhance the engineering properties of such soils. The effects of varying cement contents and curing time on the engineering properties of the expansive soils are investigated through the measurements of free swelling index, Atterberg limits and unconfined compressive strength of weak expansive soils along a section of water diversion project from Yangtze River to Huaihe River. The test results show that increasing the amount of cement decreases the free swelling index, liquid limit and plasticity index, whilst the unconfined compressive strength increases. Also, increasing the curing time leads to a reduction in the free swelling index, liquid limit and plasticity index, but an increase in the unconfined compressive strength. After seven days of curing the measured soil properties begin to be stable. Thus, the improvement of the expansive soils by cement takes long time.
吴建涛,姚开想,杨帅,施赛杰. 引江济淮工程膨胀土水泥改性剂量研究[J]. 岩土工程学报, 2017, 39(s1): 232-235.
WU Jian-tao, YAO Kai-xiang, YANG Shuai, SHI Sai-jie. Cement amount of modified expansive soils in water diversion project from Yangtze River to Huaihe River. Chinese J. Geot. Eng., 2017, 39(s1): 232-235.
 廖世文. 膨胀土与铁路工程[M]. 北京: 中国铁道出版社, 1984. (LIAO Shi-wen. Expansive soil and railway engineering[M]. Beijing: China Railway Press, 1984. (in Chinese))  王保田. 膨胀土的改良技术与工程应用[M]. 北京: 科学出版社, 2008. (WANG Bao-tian. Improvement technology and engineering application of expansive soil[M]. Beijing: Science Press, 2008. (in Chinese))  GBJ112—87膨胀土地区建筑技术规范[S]. 北京: 中国计划出版社, 1989. (GBJ112—87 Building technical specifications in expansive soil area[S]. Beijing: China Planning Press, 1989. (in Chinese))  SL237—1999土工试验规程[S]. 北京: 中国水利水电出版社, 1999. (SL237—1999 Soil test rules[S]. Beijing: China Water Power Press, 1999. (in Chinese))  JTD—051—93 公路土工试验规程[S]. 交通部公路科学研究所, 人民交通出版社, 1993. (JTD—051—93 Road soil test rules[S]. Research Institute of Highway Ministry of Communications, China Communications Press, 1993. (in Chinese))  陈善雄, 余 善. 膨胀土判别与分类方法探讨[J]. 岩土力学, 2005, 26(12): 1895-1900. (CHEN Shan-xiong, YU Shan. Discussion on the methods of discrimination and classification of expansive soil[J]. Rock and soil mechanics. 2005, 26(12): 1895-1900. (in Chinese))  吴新明, 巫锡勇. 水泥改性膨胀土试验研究[J]. 路基工程, 2007(2): 30-34. (WU Xin-ming, WU Xi-yong. Study of cement modified expansive soil[J]. Subgrade engineering, 2007(2): 30-34. (in Chinese))