Repository logo
 

The performance of blended conventional and novel binders in the in-situ stabilisation/solidification of a contaminated site soil.


Type

Article

Change log

Authors

Wang, Fei 
Wang, Hailing 
Al-Tabbaa, Abir 

Abstract

This paper presents an investigation of the effects of novel binders and pH values on the effectiveness of the in-situ stabilisation/solidification technique in treating heavy metals and organic contaminated soils after 1.5-year treatment. To evaluate the performance of different binders, made ground soils of SMiRT site, upto 5 m depth, were stabilised/solidified with the triple auger system and cores were taken for laboratory testing after treatment. Twenty four different binders were used including Portland cement (PC), ground granulated blastfurnace slag (GGBS), pulverised fuel ash (PFA), MgO and zeolite. Unconfined compressive strength (UCS), leachate pH and the leachability of heavy metals and total organics were applied to study the behaviours of binders in treating site soils. Under various contaminant level and binder level, the results show that UCS values were 22-3476 kPa, the leachability of the total organics was in the range of 22-241 mg/l and the heavy metals was in the range of 0.002-0.225 mg/l. In addition, the combination of GGBS and MgO at a ratio of 9:1 shows better immobilisation efficiency in treating heavy metals and organic contaminated soils after 1.5-year treatment, and the binding mechanisms under different binders were also discussed in this paper.

Description

Keywords

Field trials, Laboratory testing, Novel binders, Soil stabilisation, Arsenic, Compressive Strength, Construction Materials, Environmental Restoration and Remediation, Incineration, Industrial Waste, Magnesium Oxide, Metals, Heavy, Organic Chemicals, Soil Pollutants, Zeolites

Journal Title

J Hazard Mater

Conference Name

Journal ISSN

0304-3894
1873-3336

Volume Title

285

Publisher

Elsevier BV
Sponsorship
This work was supported by the UK Technology Strategy Board (Project TP/5/CON/6/I/H0304E) and the Schlumberger Foundation.