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| Research on the Identification of Expansive Soil by Moisture Absorption Water Content |
| CHEN Yong-ai , wu Qing-lin |
| China Railway Siyuan Survey and Designing Group Co. Ltd, Wuhan, Hubei 430063，China |
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Abstract Research purposes: At present, there are not unified criteria and methods in China to distinguish between expansive soil and non-expansive soil. The research studies moisture absorption water content of expansive soil of different grades from different regions by testing on the same oven-fried soil samples used in free swelling ratio experiments, and the corresponding testing methods are provided. The paper suggests determining the expansive properties of soil by moisture absorption water content of oven-fried soil, which overcomes the discreteness of free swelling ratio experiment results, and it also tries to probe for the boundary value for the identification of expansive and non-expansive soil.
Research conclusions: The given methods of testing moisture absorption water content of oven-fried soil are easy to operate and practicable to be extensively adopted in construction surveying. The results of the test indicate that there is good linear relationship between moisture absorption water content of soil and montmorillonite content, canon exchange capacity or free swelling ratio. Therefore, it can be adopted as a direction of research on ways of identifying expansive soil, and it also has great value for research on determining the expansive potential of expansive soil.
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Received: 12 March 2008
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2008, Vol. 25 
