Abstract：In order to know expansive soil properties improved by steel slag powder admixture,steel slag powder with different proportions was added into expansive soil and then its unloaded swell ratio and unconfined compression strength were tested. The test results showed that with the increase of steel slag powder content,the improvement effect to expansive soil became more and more obvious,which was reflected by that its swell ratio significantly decreased and its strength increased with the increment of steel slag powder content. It is indicated that the steel slag powder exerts obvious improvement effect to expansive soil. In combination with the test data,the functional mechanism of steel slag powder improvement effect on expansive soil is analyzed theoretically,and it provides an experimental and theoretical basis for the application of steel slag powder in expansive soil.

Keyword：steel slag power;expansive soil;unloaded swell ratio;unconfined compression strength;