Research on influence of cement content on bearing capacity of soil-cement piles to treat soft clay in Ha Thanh River urban area, Quy Nhon City, Binh Dinh province, Vietnam

Abstract

In the current practice of building foundations placed on soft soil in Vietnam, cement-soil pile technology is increasingly widely used because of its outstanding advantages. Cement-soil pile is made from local soil mixed with a certain amount of cement and additives decided by the geotechnical characterization of the soil in the project area. The main purpose of this study is to propose the optimal cement content for cement-soil piles. Many factors affect the compressive strength of cement-soil piles, in which the cement content used holds an important role and needs to be calculated. This study aims to provide appropriate cement gradation content parameters for cement-soil piles applied to construction projects in the soft soil area of Ha Thanh River, Quy Nhon City. In the paper, the samples were created by mixing soil with cement content varying from 5% to 25%. The authors determined the axial stress of soil-cement pile samples at 7 days old and 28 days old using the unconfined compressive test. The results show that the optimal cement content for cement-soil piles ranges from 12% to 15% for soft clay in the Ha Thanh urban area, Quy Nhon City, Binh Dinh province.