2020 Volume 76 Issue 2 Pages I_618-I_623
Cement or lime are widely used for ground improvement. However, on exposure to seawater, it deteriorates due to elution of calcium. Previous studies have proposed the countermeasure using Microbial Induced Carbonate Precipitation (MICP); however, most MICP studies have been laboratory based and for sand, not clay. Therefore, this study involves the preparation of samples of cement-treated clay. And seawater exposure tests were conducted in both the laboratory and actual environments. As a result, 1) the eluted calcium ions are re-fixed, 2) the crystals fill the gaps associated with deterioration, 3) the deterioration mitigation method can be applied to cement treated clay, 4) possibility of long-term preservation of strength of cement treated soil in seawater environment, were be clear.
