Abstract. In present time, dredged marine soils (DMS) are generally considered as geo-waste in Malaysia. It is also known to contain high value of water and low shear strength. Lightly solidified soils such as soilcement slurry and flowable fill are known as controlled low strength materials (CLSM). On site, the CLSM was tested for its consistency by using an open-ended cylinder pipe. The vertical and lateral displacement from the test would determine the quality and workability of the CLSM. In this study, manufactured kaolin powder was mixed with different percentages of water. Cement was also added to compare the natural soil with solidified soil samples. There are two methods of flowability test used, namely the conventional lift method and innovative drop method. The lateral displacement or soil spread diameter values were recorded and averaged. Tests showed that the soil spread diameter corresponded almost linear with the increasing amount of water. The binder-added samples show no significant difference with non-binder sample. Also, the mixing water content and percentage of fines had influenced the soil spread diameter.
The extraction of DMS from seabed along the Malaysian coastal generate millions cubic meters every year. Dredge-transport-dump the DMS at the specified open waters are unfavourable in context of environmental and geotechnical engineering. This paper describes consolidation behaviour of DMS using a modified large- oedometer with a layer of recycled granular materials such as palm oil clinker and recycled pavement materials. DMS were obtained to have high ratio of Wc with 3.27LL and considered as silty clay. A layer of drainage materials accelerates the rate of consolidation and changes in hydraulic conductivity, k of DMS. At the end of consolidation, both RPM and POC layer expediate the water from DMS and it becomes stiffer and structured.
This study conducted to investigate the improved consolidation rate of dredged marine soils used as backfills in land reclamation, with the aim of making the material’s reuse more favourable on site compared to disposal as in the normal practice. In order to quicken the dissipation of excess pore water under loading, efficiency of the drainage layers sandwiching the dredged marine soil plays an important role. With modification of a large oedometer, the present study examines the efficiency of three granular materials, i.e. sand (S), palm oil clinker (POC) and pavement milling waste (PMW) in two different drainage thicknesses for the effective discharge of pore water during consolidation of the dredged marine soils. With sand adopted as Control, it observed that thicker layers (100%) of the granular materials produced higher consolidation rates by 10% compared to 50% of thickness. Settlement reduction also found at POC and PMW as the drainage layers, i.e. 0.6% and 0.5% respectively in comparison with sand. Obviously, the improvement of DMS consolidation about 2% when implantation of granular layer.
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