Experimental study of ionic soil stabilizer-improves expansive soil

The chemical improving expansive soil of Anyang in Henan province by experiment with ionic soil stabilizer is studied. Through free swelling ratio test results combined with construction cost, the optimal ratio of ISS solution is identified as 1: 350. The soil test was carried out after the soil is chemical treated in optimal ratio of ISS solution. The soil tests include the shrinkage test, swelling index tests, consolidated quick shear test, high-pressure consolidation test and water immersion test. The soil test results show that the linear shrinkage ratio and swelling index decrease, shear strength Increase; and the improved soil has been changed from hydrophilicity to hydrophobicity and has good water stability; videlicet, the expansive soil become non-expansive after chemical treatment. It appears that the mechanism of action of ionic soil stabilizer on expansive clay can be explained through cation exchange with the surface and interlayer cations. This reduces the density of the electrical charge around the clay particles which leads to them being attracted closer to each other to form flocs; it is an irreversible process which leads to reduction of expansion and modification of the engineering properties of the expansive soil.