Relating monolithic and granular leaching from contaminated soil treated with different cementitious binders

Reginald Kogbara, Abir Al-Tabbaa, Julia A. Stegemann

Research output: Contribution to journalArticle

Abstract

This work employed a clayey, silty, sandy gravel contaminated with a mixture of metals (Cd, Cu, Pb, Ni and Zn) and diesel. The contaminated soil was treated with 5 and 10% dosages of different cementitious binders. The binders include Portland cement, cement-fly ash, cement-slag and lime-slag mixtures. Monolithic leaching from the treated soils was evaluated over a 64-day period alongside granular leachability of 49- and 84-day old samples. Surface wash-off was the predominant leaching mechanism for monolithic samples. In this condition, with data from different binders and curing ages combined, granular leachability as a function of monolithic leaching generally followed degrees 4 and 6 polynomial functions. The only exception was for Cu, which followed the multistage dose-response model. The relationship between both leaching tests varied with the type of metal, curing age/residence time of monolithic samples in the leachant, and binder formulation. The results provide useful design information on the relationship between leachability of metals from monolithic forms of S/S treated soils and the ultimate leachability in the eventual breakdown of the stabilized/solidified soil.

Original languageEnglish
Pages (from-to)1502-1515
Number of pages14
JournalJournal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering
Volume48
Issue number12
DOIs
Publication statusPublished - 15 Oct 2013
Externally publishedYes

Fingerprint

Leaching
Binders
Soils
Curing
Metals
Slag cement
Gravel
Portland cement
Fly ash
Lime
Slags
Cements
Polynomials

Keywords

  • Blast furnace slag
  • fly ash
  • granular leaching
  • lime
  • monolithic leaching
  • Portland cement

ASJC Scopus subject areas

  • Environmental Engineering

Cite this

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