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

Authors
  • Kogbara, Reginald B
  • Al-Tabbaa, Abir
  • Stegemann, Julia A
Type
Published Article
Journal
Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering
Publication Date
Jan 01, 2013
Volume
48
Issue
12
Pages
1502–1515
Identifiers
DOI: 10.1080/10934529.2013.796824
PMID: 23802159
Source
Medline
License
Unknown

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.

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