Untitled - Teknik Kelautan / ITB

Pipe Coating and Concrete Mattress for Weighting Offshore Gas
Pipes Using Nickel Slag as Concrete Aggregate
Saptahari Sugiri 1) , Ivindra Pane 1) , Ediansjah Zulkifli 1)
1 Structure Research Group,
Faculty of Civil and Environmental Engineering,
Institute of Technology Bandung
saptahari@si.itb.ac.id
Abstract. Indonesia is one of the producers of nickel in significant amounts, where
one of the nickel industry can be found in Soroako and Pomala, Sulawesi. The waste
from the nickel industry is called nickel slag. Nickel slag has a very heavy weight
thus making it suitable for use as aggregate material in concrete for weighted pipes,
such a concrete layers for steel pipes or in the form of concrete mattresses. The rapid
expansion of offshore gas explorations has given rise to the need for weighted
concrete for gas pipes in the form of concrete layers or mattresses, and therefore
nickel slag is very potential for use as aggregate in concrete for weighted pipes due
to its heavy weight and abundance as by-product. Research studies on concrete for
weighted pipes using nickel slag aggregate using ACI method results in a
compression strength of 50,77 MPa. Furthermore the mixture complies with the
requirement for concrete absorption to be lower then 5 % which is 0,69 %, and the
specific gravity is 3267 kg/m3.
Keywords : Nickel Slag, aggregate, concrete for weighted pipes, concrete mattress.
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