Paper (In Japanese)
EVALUATION FOR THE DEPOSITION OF MAGNESIUM HYDROXIDE LAYER ON THE SURFACE OF CEMENT-TREATED SOIL BY MAGNESIUM CONCENTRATION AND PH
2022 Volume 78 Issue 2 Pages 72-82
Details
2022 Volume 78 Issue 2 Pages 72-82
A white layer, containing magnesium hydroxide (Mg(OH)2) as the main component may be deposited on the surface of cement treated soil under saline condition. This layer has the function of protecting cement-treated soil from deterioration due to seawater. In this study, in order to clarify the conditions for the deposit of Mg(OH)2 layer, the effects of magnesium concentration in seawater and the pH of cement-treated soil were investigated in laboratory tests. It was observed that the Mg(OH)2 layer was deposited when the pH of the cement-treated soil was above a certain value, regardless of the soil type. In addition, pH value of the treated soil which the Mg(OH)2 layer was deposited varied depending on the magnesium concentration in the contacting seawater. The deposition of Mg(OH)2 layer depends on the range of pH (12.29-12.81) and the concentration of magnesium (50-1750mg/L).
