Some insights to the reuse of dredged marine soils by admixing with activated steel slag
Regular dredging is necessary for the development of coastal regions and the maintenance of shipping channels. The dredging process dislodges sediments from the seabed, and the removed materials, termed dredged marine soils, are generally considered a geowaste for dumping. However, disposal of the d...
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| Format: | Article |
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Hidwani Publishing Corporation
2014
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| Online Access: | http://www.hindawi.com/journals/ace http://www.hindawi.com/journals/ace http://eprints.uthm.edu.my/7423/1/chan_chee_ming_7_U.pdf |
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| Summary: | Regular dredging is necessary for the development of coastal regions and the maintenance of shipping channels. The dredging
process dislodges sediments from the seabed, and the removed materials, termed dredged marine soils, are generally considered a
geowaste for dumping. However, disposal of the dredged soils offshores can lead to severe and irreversible impact on the marine
ecosystem, while disposal on land often incurs exorbitant costs with no guarantee of zero-contamination. It is therefore desirable
to reuse the material, and one option is solidification with another industrial waste, that is, steel slag. This paper describes the
exploratory work of admixing dredged marine soil with activated steel slag for improvement of the mechanical properties. An
optimumactivation concentration ofNaOHwas introduced to the soil-slag mixture for uniformblending. Specimenswere prepared
at different mix ratios then left to cure for up to 4 weeks.The unconfined compressive strength test was conducted to monitor the
changes in strength at predetermined intervals. It was found that the strength does not necessarily increase with higher steel slag
content, indicating an optimum slag content required for the maximumsolidification effect to take place. Also, regardless of the slag
content, longer curing time produces greater strength gain. In conclusion, steel slag addition to dredged sediments can effectively
strengthen the originally weak soil structure by both the “cementation” and “filler” effects, though the combined effects were not
distinguished in the present study. |
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