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

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