Modified Dry Mixing (MDM) – A New Possibility in Deep Mixing

A Modified Dry Mixing (MDM) method has been developed. By an innovative modification to the existing dry mixing process and equipment, water can be injected into the soil during the installation process. By adjusting the water content of the soil, columns of significant strength can be produced even in various soils of very low water content, where the regular dry method normally could not be used. The MDM process also yields improvements in mixing efficiency resulting in more homogenous columns of high quality. During the development, a feasibility full-scale field test was performed showing promising results and improvements compared to the regular dry mixing method. This paper presents the possibilities of the MDM method and the field test results.