TY - JOUR AU - Soon Hoe Chew, AU - Hor Mun Audrey Yim, AU - Juan Wei Koh, AU - Kok Eng Chua, AU - Zi Xiang Gng, PY - 2020/10/30 Y2 - 2024/03/29 TI - QA/QC PLAN AND EVALUATION OF FIELD STRENGTH AND PERMEABILITY VALUE FOR DEEP CEMENT MIXING JF - GEOMATE Journal JA - INTERNATIONAL JOURNAL OF GEOMATE VL - 19 IS - 74 SE - Articles DO - UR - https://geomatejournal.com/geomate/article/view/1826 SP - 52-58 AB - <p>Deep Cement Mixing (DCM) is widely used to improve the strength and stiffness of soil by <br>mixing it with cement. When DCM is used as a low permeability barrier for water cut off, permeability must <br>be tested in addition to the usual strength values. One concern in DCM construction is the quality assurance <br>and quality control (QA/QC) of this technique to ensure uniformity along the DCM column. It is even more <br>crucial when low permeability is required for the DCM column to be used as a seepage cut-off in an earth bund, <br>in addition to its strength requirement. In this application, the DCM columns require low permeability and <br>adequate strength. In this paper, two QA/QC aspects will be evaluated: the operational control and the <br>evaluation of the treated DCM column. The operational control in terms of mixing time, cement content, <br>rotation speed and mixing energy will be studied to gain an understanding of how strength and permeability <br>changes with the variability of the soil with depth. A rational QA/QC plan will be briefly proposed to ensure a <br>consistent and rational method is developed for the evaluation of the strength and permeability variation of the <br>treated soils over the area and the depth. These will help in the development of acceptable characteristic value <br>for the geotechnical parameters of soils treated with DCM (in line with Eurocode 7).</p> ER -