The study of leaching of heavy metals contaminant in cement pastes containing bagasse ashes

Abstract

This research investigated the properties of solidified wastes using bagasse ash and ordinary Portland
cement as binder. Bagasse ash were used to partially replace the ordinary Portland cement at the rate of 0%,
10 %, 20% and 30% by weight respectively. The plating sludge was used at the rate of 0, 10, 20 and 30% by
weight of binder. A constant normal consistency was used for all of the mixtures. XRF and SEM were performed to investigate the chemical proportion and the particle shape of materials. Compressive strength
of solidified wastes leachability of heavy metals was investigated by TCLP. Test results indicated that the
compressive strength of all solidified wastes made with 10, 30 and 50 wt.% of plating sludge were
dramatically decreased as compared to that without the waste. In addition, the compressive strength of
blended cement pastes from 20 wt.% of bagasse ash replacement showed higher strength more than 10
wt.% and 30 wt.% of bagasse ash replacement while concentrations of heavy metals in the leachates after
contacting with all cement-based solid wastes did not exceed the limit specified by US.EPA.