Repository logo

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

Published version

Change log


Wang, Fei 
Al-Tabbaa, Abir 


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 50-250kPa; 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 10-105mg/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.



GGBS, In-situ mass stabilisation, Leachability, MgO, Strength

Journal Title

J Hazard Mater

Conference Name

Journal ISSN


Volume Title



Elsevier BV
Engineering and Physical Sciences Research Council (EP/K503757/1)
The authors are grateful to the funding from EPSRC IAA follow-on fund to support this research. The samples were all retrieved from a field trial sponsored by EPSRC/TSB (Grant No.: TP/5/CON/6/I/H0304E).
Is supplemented by: