CUED Publications database

Three-year performance of in-situ solidified/stabilised soil using novel MgO-bearing binders.

Jin, F and Wang, F and Al-Tabbaa, A (2015) Three-year performance of in-situ solidified/stabilised soil using novel MgO-bearing binders. Chemosphere, 144. pp. 681-688.

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Abstract

A new group of MgO-bearing binders has been developed recently which showed improved sustainability and technical performance compared to Portland cement (PC). However, the application of these MgO-bearing binders in the Solidification/Stabilisation (S/S) techniques is very limited. This study investigates the three-year performance of a highly contaminated soil treated by in-situ S/S using MgO-bearing binders and PC. The core quality, strength, permeability and the leaching properties of the S/S materials were evaluated. The effects of binder composition, addition of inorgano-organo-clay (IOC) and the grout content on the properties of the 3-y S/S materials are discussed. It is found that although MgO alone provided negligible strength to the soil, it is superior in immobilising both inorganic and organic contaminants. Replacing MgO by ground granulated blast-furnace slag (GGBS) significantly enhanced the strength while also performed well in immobilising the contaminants. The improved pH buffering capacity was attributed to the low solubilities of brucite and hydrotalcite-like phases formed in the MgO-bearing binders, and was also the reason for the improved performance in stabilising contaminants. The addition of IOC slightly decreased the strength and the permeability of the S/S materials but inconsistent effect on the contaminant immobilisation was found depending on the binder composition. This study showed no degradation of the S/S materials after 3 y exposure to field conditions and has proved the applicability and the advantages of MgO-bearing binders over PC in S/S.

Item Type: Article
Uncontrolled Keywords: GGBS In-situ stabilisation/solidification Leaching MgO Permeability Strength Aluminum Hydroxide Aluminum Silicates Magnesium Hydroxide Magnesium Oxide Soil Soil Pollutants
Subjects: UNSPECIFIED
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 18:59
Last Modified: 21 Sep 2017 01:35
DOI: