Investigation on leaching behaviour of fly ash and bottom ash replacement in self-compacting concrete
Fly ash and bottom ash are some of the waste generated by coal-fired power plants, which contains large quantities of toxic and heavy metals. In recent years, many researchers have been interested in studying on the properties of self-compacting concrete incorporated with fly ash and bottom ash but...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Conference or Workshop Item |
| Published: |
2016
|
| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/8466/ |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Fly ash and bottom ash are some of the waste generated by coal-fired power plants,
which contains large quantities of toxic and heavy metals. In recent years, many researchers
have been interested in studying on the properties of self-compacting concrete incorporated
with fly ash and bottom ash but there was very limited research from the combination of fly
ash and bottom ash towards the environmental needs. Therefore, this research was focused on
investigating the leachability of heavy metals of SCC incorporated with fly ash and bottom ash
by using Toxicity Characteristic Leaching Procedure, Synthetic Precipitation Leaching
Procedure and Static Leaching Test. The samples obtained from the coal-fired power plant
located at Peninsula, Malaysia. In this study, the potential heavy metals leached out from SCC
that is produced with fly ash as a replacement for Ordinary Portland Cement and bottom ash as
a substitute for sand with the ratios from 10% to 30% respectively were designated and cast.
There are eight heavy metals of concern such as As, Cr, Pb, Zn, Cu, Ni, Mn and Fe. The results
indicated that most of the heavy metals leached below the permissible limits from the United
States Environmental Protection Agency and World Health Organization limit for drinking
water. As a conclusion, the minimum leaching of the heavy metals from the incorporation of
fly ash and bottom ash in self-compacting concrete was found in 20% of fly ash and 20% of
bottom ash replacement. The results also indicate that this incorporation could minimize the
potential of environmental problems. |
|---|