Engineering properties of pozzolanic cement-stabilised organic soil

Abstract

In this study, the engineering properties of organic soil (OS) stabilised with pozzolanic cement (PC) were investigated. In tests, 10%, 15% and 20% proportions of PC were added to organic soil. Consistency limits, Proctor, unconfined compressive strength (UCS), triaxial (UU), swelling and compressibility tests were performed for OS stabilised with PC. The addition of PC to OS increased the minimum dry density (MDD) and optimum moisture content (OMC) values. The UCS values for OS stabilised with PC increased up to the 56 th day and then there was a reduction in unconfined compressive strength after the 56 th day. The internal friction angle value increased by 26% and the cohesion intercept value increased by 86% for OS stabilised with PC. With the increase in cement content in OS stabilised with PC, the UCS, internal friction angle and cohesion intercept values increased. Swelling of OS stabilised with PC rapidly reduced up to the 10th day and this reduction slowed after the 10th day. The compressibility of OS stabilised with PC increased until the 10 th day and this increase slowed after the 10th day. With the increase in cement content in OS stabilised with PC, swelling and compressibility values reduced. As a result of the study, it appears that pozzolanic cement is an effective stabiliser for organic soil.