Interest in using recycled concrete aggregates (RCA) from
demolished old concrete structures in new construction is growing
fast recently [1]. Such interest derives from two problems associated
with sustainability, i.e. lack of land for disposing demolished
concrete debris and depletion of quality primary natural aggregates
for concrete production. This is of particular importance to
small country like Singapore. As an island city-state with limited
land space and nature resource, it is crucial for Singapore to develop
strategies to prolong the lifespan of landfills and to recover
waste into resources. Recent aggregate crises in Singapore highlight
the need of identifying alternative aggregate resources [2].
The heavy dependency on import of aggregates from neighboring
countries and soaring prices make the use of RCA an attractive
solution.