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A platform for research: civil engineering, architecture and urbanism
Leaching evaluation of cement stabilisation / solidification treated kaolin clay
Abstract Sustainable land management often requires redevelopment of existing and often contaminated Brownfield sites over use of Greenfield or agricultural land. Stabilisation / solidification (S/S) offer a viable remediation option with particular suitability in treating heavy metal contaminants. However, uncertainties over long-term durability and previously cheap landfill disposal costs resulted in limited use in many countries. There is a need to characterise treated material and assess components containment and release, to improve S/S confidence and inform remedial design, using the evaluation of the leaching controlling mechanisms. To improve understanding of key features that will enable improvements to such designs, this paper presents an evaluation of leaching for CEM II stabilised kaolin, using the leaching behaviour of 4 main components—aluminium, silicon, calcium and sulphur. Results show no detrimental implications on chemical durability due to kaolin degradation with hydration under induced alkalinity, with increased formation of stable cementitious minerals. Availabilities for components show that aluminium and silicon had minimal leachability compared to total content, whilst calcium and sulphur show almost total leaching availability. Decreasing calcium and silicon leachability under natural chemical conditions with increased hydration duration supports the increased formation of stable cementitious products with time, using the products of kaolin dissociation.
Highlights ► Details of chemical release from cement stabilised kaolin soils up to 300days. ► No detrimental degradation of kaolin with hydration under increase alkalinity. ► Aluminium, silicon and iron show minimal leachability. ► Cementitious product demonstrated stability with time.
Leaching evaluation of cement stabilisation / solidification treated kaolin clay
Abstract Sustainable land management often requires redevelopment of existing and often contaminated Brownfield sites over use of Greenfield or agricultural land. Stabilisation / solidification (S/S) offer a viable remediation option with particular suitability in treating heavy metal contaminants. However, uncertainties over long-term durability and previously cheap landfill disposal costs resulted in limited use in many countries. There is a need to characterise treated material and assess components containment and release, to improve S/S confidence and inform remedial design, using the evaluation of the leaching controlling mechanisms. To improve understanding of key features that will enable improvements to such designs, this paper presents an evaluation of leaching for CEM II stabilised kaolin, using the leaching behaviour of 4 main components—aluminium, silicon, calcium and sulphur. Results show no detrimental implications on chemical durability due to kaolin degradation with hydration under induced alkalinity, with increased formation of stable cementitious minerals. Availabilities for components show that aluminium and silicon had minimal leachability compared to total content, whilst calcium and sulphur show almost total leaching availability. Decreasing calcium and silicon leachability under natural chemical conditions with increased hydration duration supports the increased formation of stable cementitious products with time, using the products of kaolin dissociation.
Highlights ► Details of chemical release from cement stabilised kaolin soils up to 300days. ► No detrimental degradation of kaolin with hydration under increase alkalinity. ► Aluminium, silicon and iron show minimal leachability. ► Cementitious product demonstrated stability with time.
Leaching evaluation of cement stabilisation / solidification treated kaolin clay
John, U.E. (author) / Jefferson, I. (author) / Boardman, D.I. (author) / Ghataora, G.S. (author) / Hills, C.D. (author)
Engineering Geology ; 123 ; 315-323
2011-09-04
9 pages
Article (Journal)
Electronic Resource
English
S/S , Stabilisation / Solidification , pH , Measure of Acidity / Alkalinity , Eh , Redox (oxidation reduction) Potential , L/S , Liquid to Solid Ratio , L/A , Liquid to Specific Surface Area Ratio , rpm , Revolutions Per Minute , ECC , Kaolin Clay , EO , CEM II Portland Limestone Cement Stabilised Kaolin Clay , DOC , Dissolved Organic Carbon , Stabilisation / solidification , Leaching , Chemical durability , Remediation
Leaching evaluation of cement stabilisation / solidification treated kaolin clay
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