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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/3598

Title: A philosophy for a performance specification for road foundations
Authors: Rogers, C.D.F.
Fleming, Paul R.
Frost, Matthew W.
Issue Date: 2004
Publisher: © Thomas Telford
Citation: ROGERS, C.D.F., FLEMING, P.R. and Frost, M.W., 2004. A philosophy for a performance specification for road foundations. Proceedings of ICE, Transport, 157 (3), pp. 143-151 [DOI:10.1680/tran.157.3.143.41181]
Abstract: The road foundation layers perform several functions both during construction and when the road is in service, for example load-spreading, temporary haul routes, and a base for the overlying construction layers. The critical loading condition is usually directing trafficking where the applied stresses are greatest. The capping and subbase layers during construction require adequate stiffness and strength to resist these stresses. The current UK specification for road foundations is based on a recipe approach, and, unless permission is granted to use an analytical design, the pavement foundation designs are based entirely on the California Bearing Ratio (CBR) to characterise the subgrade, capping and sub-base materials. Here CBR is used as an index of both material strength and stiffness, although it measures neither directly. Such an approach is potentially inefficient and does not readily facilitate the use of new and marginal materials or alternative design procedures. Recent technical advances in laboratory and in situ testing of pavement foundation materials now allow the performance parameters of stiffness, strength and resistance to permanent deformation to be measured both for design and during construction. This in turn enables a performance-based specification for road foundation layers to be introduced to provide some assurance of the as-constructed quality, and by permitting the use of secondary or recycled aggregates, to contribute to the parallel goal of sustainable construction. This paper sets out an idealised philosophy for a performance-based specification for road foundations, examines the individual elements of the specification in relation to current knowledge and makes recommendations for a phased introduction alongside CBR-based methods.
Description: This is a journal article. It was published in the journal, Proceedings of ICE, Transport [© Thomas Telford] and is also available at: http://www.thomastelford.com/journals/
URI: https://dspace.lboro.ac.uk/2134/3598
ISSN: 0965-092X
Appears in Collections:Published Articles (Civil and Building Engineering)

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