Induced cementation of dredged marine soils for civil engineering reuse
Ports and harbour facilities require regular dredging to maintain trafficability and safety of the vessels. The material removed from the seabed, i.e. dredged marine soils, is generally considered a waste material for disposal, either in designated offshore locations or inland containment facilities...
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| Format: | Conference or Workshop Item |
| Published: |
2014
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| Online Access: | http://eprints.uthm.edu.my/6197/ http://eprints.uthm.edu.my/6197/1/Induced_Cementation_of_Dredged_Marine.pdf |
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| Summary: | Ports and harbour facilities require regular dredging to maintain trafficability and safety of the vessels.
The material removed from the seabed, i.e. dredged marine soils, is generally considered a waste
material for disposal, either in designated offshore locations or inland containment facilities. Either
measure incurs costs, time and labour, not to mention the obvious lack of sustainable values.
Besides, there is always the risk of transferring undesirable contaminants in the dredged materials to
the disposal sites, as well as along the transportation routes. It is however, possible to reuse this
otherwise waste, with suitable and adequate pre-treatment. Considering that the material is
essentially soil-based, primarily consisting sand, silt and clay with some larger marine debris, it is
perhaps most apt to harness its inherent properties as a ‘soil’ and reuse it as a geomaterial. In civil
engineering and construction terms, this would mean reusing the soils as a backfill material, for
creating new land bases or restoring eroded ones in near-shore areas. However the inherent poor
physico-mechanical properties of dredged soils, such as high saturation with water, low strength and
high compressibility, make the material unsuitable to be reused as it is. An expedient approach is
induced cementation, where additives are mixed with the soil to improve the necessary properties
prior to reuse. This paper examines the induced cementation of some dredged marine soil samples
from the Malaysian waters with cement and/or other binders. The common factors, such as binder
dosage, curing period and water/binder ratios, were monitored to ascertain the mechanisms involved
to enhance the material’s performance. |
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