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Title: Examining k-E relationship of pavement subgrade based on load-deflection consideration
Authors: Setiadji, B.H.
Fwa, T.F. 
Keywords: Concrete pavements
Issue Date: 2009
Citation: Setiadji, B.H., Fwa, T.F. (2009). Examining k-E relationship of pavement subgrade based on load-deflection consideration. Journal of Transportation Engineering 135 (3) : 140-148. ScholarBank@NUS Repository.
Abstract: Most rigid-pavement design methods in use today adopt the Westergaard's approach that characterizes pavement foundation by k, the modulus of subgrade reaction. k is measured by a standard plate loading test conducted in the field. However, since this test is elaborate, expensive, and time consuming, the k value of a subgrade soil is usually estimated from other soil properties. In this regard, the relationship between k and the modulus of elasticity E of the soil is of special interest. This is because E is a fundamental engineering property and that there exists various test methods for determining E either in the field or in the laboratory. This paper proposes a procedure to estimate k from E by establishing an equivalency between two theoretical pavement models, a model of pavement slab supported by an elastic solid foundation (termed the E model) and a model of pavement slab supported by a dense liquid foundation (termed the k model). Instead of matching the k and E models directly as is done in currently available k-E relationship models, this study proposes to define an equivalent k model and an equivalent E model, separately, with respect to actual rigid pavements. The equivalency is established using back-calculation analysis based on load-deflection considerations. Using the deflection test data of the long-term pavement performance database, it is found that there exists a relationship between the radii of relative stiffness of the two theoretical systems, and this relationship can be used to estimate k from a given E value. © 2009 ASCE.
Source Title: Journal of Transportation Engineering
ISSN: 0733947X
DOI: 10.1061/(ASCE)0733-947X(2009)135:3(140)
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