Three-year performance of in-situ mass stabilised contaminated site soils using MgO-bearing binders

Wang, F., Jin, F. , Shen, Z. and Al-Tabbaa, A. (2016) Three-year performance of in-situ mass stabilised contaminated site soils using MgO-bearing binders. Journal of Hazardous Materials, 318, pp. 302-307. (doi:10.1016/j.jhazmat.2016.07.018) (PMID:27427896)

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Abstract

This paper provides physical and chemical performances of mass stabilised organic and inorganic contaminated site soils using a new group of MgO-bearing binders over 3 years and evaluated the time-dependent performance during the 3 years. This study took place at a contaminated site in Castleford, UK in 2011, where MgO, ground granulated blastfurnace slag (GGBS) and Portland cement (PC) were mixed with the contaminated soils in a dry form using the ALLU mass mixing equipment. Soil cores were retrieved 40-day, 1-year and 3-year after the treatment. The core quality, strength, and the leaching properties were determined via physical observation, unconfined compressive strength (UCS) and batch leaching tests. After 3-year treatment, the UCS values of ALLU mixes were in the range of 50–250 kPa; the leachate concentrations of Cd, Pb, Cu and Zn (except Ni) in all mixes were lower than their drinking water standards; and the leachability of total organics was in the range of 10–105 mg/L. No apparent degradation of the mass stabilised materials after 3 years’ exposure to the field conditions was found. MgO-GGBS blends were found able to provide higher strength and less leachability of contaminants compared to PC and MgO-only mixes in mass stabilised soils.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Jin, Dr Fei
Authors: Wang, F., Jin, F., Shen, Z., and Al-Tabbaa, A.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
Journal Name:Journal of Hazardous Materials
Publisher:Elsevier
ISSN:0304-3894
ISSN (Online):1873-3336
Published Online:07 July 2016
Copyright Holders:Copyright © 2016 The Authors
First Published:First published in Journal of Hazardous Materials 318:302-307
Publisher Policy:Reproduced under a Creative Commons License

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