Leaching evaluation of cement stabilisation / solidification treated kaolin clay
John, U.E., Jefferson, I., Boardman, D.I., Ghataora, G.S. and Hills, C.D. (2011) Leaching evaluation of cement stabilisation / solidification treated kaolin clay. Engineering Geology, 123 (4). pp. 315-323. ISSN 0013-7952 (online)Full text not available from this repository.
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 longterm 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.
|Uncontrolled Keywords:||stabilisation / solidiﬁcation, leaching, chemical durability, remediation|
|Subjects:||T Technology > TA Engineering (General). Civil engineering (General)|
T Technology > TP Chemical technology
|School / Department / Research Groups:||School of Science|
School of Science > Department of Pharmaceutical, Chemical & Environmental Sciences
|Last Modified:||10 Feb 2012 09:17|
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