The effect of chemical admixtures on the geotechnical parameters of organic soil: a new statistical model

This study illustrates the geotechnical parameters of stabilized soil prepared in the laboratory by mixing cement, lime and bentonite at varying content of 5, 10, 15, 20 and 25% of dry mass of organic soil. The effect of admixtures content on compressive strength (q_u), changes of liquid limit (w_L) with mixing water, variation of compaction parameters with admixture and organic content as well as develop a linear regression model using SPSS were highlighted by the author. To these attempts, organic soil samples were collected from four selected locations at Khulna region. In the laboratory, required ASTM (2004) methods were followed to measure the relevant parameters of stabilized soil. Result reveals that q_u of stabilized soil increases with the increase of admixtures content and curing period. However, w_L of all the stabilized soils decreases with the increasing of admixture content and curing period. In contrast, dry density increases, while, optimum moisture content decreases with the increasing of admixture content. To depict the reliability and accuracy of the predicted q_u from developed regression model were compared with the laboratory measured values. Result depicts that regression coefficient (R²) was ranging from 0.909–0.984, 0.536–0.930, 0.726–0.965 for cement, lime and bentonite stabilized soil.