Proceedings of the Deep Mixing 2015 Conference, (DFI)
Cement Deep Mixing in Lach Huyen Port Infrastructure Construction Project in Northern Vietnam
Masakazu Takano, Penta-Ocean Construction Co., Ltd., Japan; Koji Suzuki, Toa Corporation, Japan; Naotoshi Shinkawa, Fudo-Tetra Corporation, Japan
Cement deep mixing (CDM) method successfully applied to a marine construction project in northern Vietnam is reported. The method is classified as wet method, in which cement slurry is injected into the ground. Thickness of clayey deposit subjected to improvement is from 20 m to 28 m, and the total volume of CDM improvement exceeds 460,000 m3. This is the first massive application of CDM method in the region. Three CDM barges, each equipped with four mixing shafts, were brought to the site in order to finish CDM work within a period of seven months. Cement content used in the work was 180 kg/m3 and water-cement ratio of slurry was 100%. Unconfined compression strength of stabilized soil was 1,200 kPa to 1,600 kPa in average with coefficient of variation from 0.3 to 0.4. Statistics analysis of the strength with these values gave percentage of lower strength less than 10%. Trial use of needle penetration test performed to study strength profile of a CDM column is also reported.
|article #2052; publication #1013 (DM-2015)|