Land reclamation & soil improvement using dredged slurry as fill

Stabilization of dredged clay slurry with carbide sludge (CS)-ground granulated blastfurnace slag (GGBS) for land reclamation

“…With the activity in the range of 0.5-1.3, Singapore marine clay is regarded as inactive to active clay, but mostly inactive (Bo et al, 2015). Generally, the water content of dredged clay varies in a range of 80-220% (Bo et al, 2005a;Lee et al, 1987;Pang, 2017;Santoso et al, 2013), and the particle results…”

“…The frequent rainfall in Singapore makes sun-drying method inapplicable. Moreover, the clay slurry under the sundried crust layer would remain in the slurry form with negligible strength (Pang, 2017), and when sand-capping is used, the sand placed on the top layer of slurry would directly sink into it. In this context, geotextile can be used to cover the surface of soil slurry, and then the hydraulic placed sand will be able to form a working platform (Terashi and Katagiri, 2005).…”

“…Due to the large volume loss during drainage, more filling materials are required in land reclamation. Taking the vacuum preloading application in Jurong, Singapore as an example, the volume reduction was estimated to be 30% of the initial volume (Pang, 2017). In Changi East Reclamation Project, prefabricated vertical drains (PVDs) with fill surcharge were used (Bo et al, 2005a;Chu et al, 2009), and generally 12-36 months were required to achieve the 90% degree of consolidation.…”