title: The performance of blended conventional and novel binders in the in-situ stabilisation/solidification of a contaminated site soil.
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.
authors.affiliation: Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK. Electronic address: fw281@cam.ac.uk.
authors.forename: Fei
authors.initials: F
authors.lastname: Wang
authors.affiliation: College of Environment, Nanjing Tech University, Nanjing 210009, China. Electronic address: wanghailing@njtech.edu.cn.
authors.forename: Hailing
authors.initials: H
authors.lastname: Wang
authors.affiliation: Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK. Electronic address: fj232@cam.ac.uk.
authors.forename: Fei
authors.initials: F
authors.lastname: Jin
authors.affiliation: Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, UK. Electronic address: aa22@cam.ac.uk.
authors.forename: Abir
authors.initials: A
authors.lastname: Al-Tabbaa
mesh_terms: D001151:Arsenic / Q000737:chemistry; D019245:Compressive Strength; D003252:Construction Materials; D052918:Environmental Restoration and Remediation / Q000379:methods*; D017745:Incineration; D007220:Industrial Waste; D008277:Magnesium Oxide / Q000737:chemistry; D019216:Metals, Heavy / Q000737:chemistry*; D009930:Organic Chemicals / Q000737:chemistry*; D012989:Soil Pollutants / Q000737:chemistry*; D017641:Zeolites
chemical_list: D007220:Industrial Waste; D019216:Metals, Heavy; D009930:Organic Chemicals; D012989:Soil Pollutants; D017641:Zeolites; D008277:Magnesium Oxide; D001151:Arsenic
keywords: Field trials; Laboratory testing; Novel binders; Soil stabilisation