Investigation on Leaching Behaviour of Fly Ash and Bottom Ash Replacement in Self-Compacting Concrete

International Conference on Innovative Research - ICIR Euroinvent 2016

Kadir, Aeslina Abdul^1,2 ; Hassan, Mohd Ikhmal Haqeem^1 ; Abdullah, Mohd Mustafa Al Bakri^2,3

Faculty of Civil and Environmental Engineering, Universiti Tun Hussein Onn Malaysia, Parit Raja, Batu Pahat Johor

86400, Malaysia^1

Center of Excellence Geopolymer and Green Technology (CeGeoGTech), School of Material Engineering, Universiti Malaysia Perlis (UniMAP), Perlis, Malaysia^2

Faculty of Engineering Technology, Universiti Malaysia Perlis (UniMAP), Perlis, Malaysia^3

关键词: Coal-fired power plant;    Environmental problems;    Leachability of heavy metals;    Ordinary Portland cement;    Synthetic precipitation leaching procedures;    Toxicity characteristic leaching procedures;    United States environmental protection agency;    World Health Organization;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/133/1/012036/pdf
DOI  :  10.1088/1757-899X/133/1/012036

来源: IOP

【 摘 要 】

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.