High-Strength Ground-Improvement Using Low Water–Cement Ratio Slurry

Ground-improvement techniques can increase the strength of the ground. They can be used with the existing soils; therefore, the impact upon the environment is very small. If the compressive strengths of the ground improvements are increased, the amount of the ground improvements being used can be reduced, thus proving effective in reducing the impact on the environment. Therefore, these techniques have been increasingly utilized in recent years. In this study, to increase the compressive strength, ground improvements using a slurry with low water–cement ratio (approximately 40%) has been developed. The laboratory test results for developing a dispersing agent suitable for low water–cement ratio slurry are presented and the properties of this slurry and the slurry mixed soil are described. Furthermore, in-situ construction experiment using a low water–cement ratio slurry are carried out, and the quality survey results of constructed ground improvements are also presented.