Alkali activation of milled slag and its implications for the use of unmilled slag as a road stabiliser
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Lieuw Kie Song, M.R.
Emery, S.
Benn, M.
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SATC
Abstract
Paper presented at the 20th Annual South African Transport Conference 16 - 20 July 2001 "Meeting the transport challenges in Southern Africa", CSIR International Convention Centre, Pretoria, South Africa.
Un-milled GBS is widely used in France for stabilising gravels and sands and this stabilisation method is referred to as Grave-Laitier (GL) meaning gravel-slag. If sand is stabilised it is called Sable Laitier (sand-slag). In this process the GBS is mixed with the gravel or sand in a mixing installation (much like a concrete mixer). Because GBS will not hydrate in its own, but needs to be activated, lime and gypsum are added during the mixing process. Because un-milled slag has a gradation like sand and is used in relatively high percentages as a stabiliser (10 to 20%), the GBS not only provides chemical, but also a mechanical stabilisation. This stabilisation method has a number of advantages over conventional stabilisation using Ordinary Portland Cement (OPC) or bitumen.
Un-milled GBS is widely used in France for stabilising gravels and sands and this stabilisation method is referred to as Grave-Laitier (GL) meaning gravel-slag. If sand is stabilised it is called Sable Laitier (sand-slag). In this process the GBS is mixed with the gravel or sand in a mixing installation (much like a concrete mixer). Because GBS will not hydrate in its own, but needs to be activated, lime and gypsum are added during the mixing process. Because un-milled slag has a gradation like sand and is used in relatively high percentages as a stabiliser (10 to 20%), the GBS not only provides chemical, but also a mechanical stabilisation. This stabilisation method has a number of advantages over conventional stabilisation using Ordinary Portland Cement (OPC) or bitumen.
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This paper was transferred from the original CD ROM created for this conference. The material on the CD ROM was published using Adobe Acrobat technology. The original CD ROM was produced by Document Transformation Technologies Postal Address: PO Box 560 Irene 0062 South Africa. Tel.: +27 12 667 2074 Fax: +27 12 667 2766 E-mail: doctech@doctech.co.za URL: http://www.doctech.co.za
Keywords
Grave-Laitier (GL) method, Sable Laitier (sand-slag), Ordinary Portland Cement (OPC), Alkali activation, Milled slag, Unmilled slag, Road stabiliser
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Citation
Lieuw Kie Song, MR, Emery, S & Benn, M 2001, 'Alkali activation of milled slag and its implications for the use of unmilled slag as a road stabiliser', Paper presented to the 20th Annual South African Transport Conference, South Africa, 16 - 20 July.