Skip to main content
Article thumbnail
Location of Repository

EXECUTIVE SUMMARY

By Md Sazzad Bin-shafique, Craig H. Benson and Tuncer B. Edil

Abstract

This study was conducted to evaluate the potential for leaching of metals from fly ash stabilized subgrade soils used in highway construction. Four different tasks were undertaken: (1) water leach testing (WLT), (2) laboratory column testing, (3) field lysimeter testing, and (4) numerical modeling. Testing was conducted on soil-fly ash mixtures that were prepared with three locally available fly ashes and four subgrade soils representing a range of subgrade soil conditions that might be encountered in Wisconsin. The WLTS showed that concentrations of metals in the leachate from soil-fly ash mixtures tend to be lower (1.5 to 2.5 times) than those from fly ash alone. The concentration increases non-linearly with increasing fly ash content, and cannot be estimated from a simple dilution calculation. The partitioning of metals between the solid and liquid phases is non-linear because the pH of the leachate increases nonlinearly with increasing fly ash content. Column leaching tests conducted in the laboratory showed that the pH of the effluent and initial effluent concentration from soil-fly ash mixtures increases wit

Year: 2011
OAI identifier: oai:CiteSeerX.psu:10.1.1.187.5343
Provided by: CiteSeerX
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • http://citeseerx.ist.psu.edu/v... (external link)
  • http://wvwri.nrcce.wvu.edu/pro... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.