Abstract: In order to solve problems in the cement-improved treatment for expansive soil, we conducted a field test of the construction techniques according to summary of relevant literatures and construction method of expansive soil improved by lime. Furthermore, three key methods in construction were studied, including reduction of high water content in the excavated soil, breakage of oversize soil aggregate, and time effect of filling construction of cement-improved expansive soil. Then, uniformity of blending cement and the applicability and feasibility of construction process using crusher, rotavator, strip sieve, machine combination ,etc were systematically analyzed.Finally, a construction method for improving expansive soil by cement was put forward. The results can provide references for the construction techniques of improving expansive soil.

Key words: cement-improved expansive soil, construction technology, reduction rate of moisture content, breakage of soil aggregate, EDTA titration