Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/65963
Title: Parameters back-calculation for concrete pavement with two slab layers
Authors: Shuo, L.
Fwa, T.F. 
Tan, K.-H. 
Issue Date: Nov-1998
Source: Shuo, L.,Fwa, T.F.,Tan, K.-H. (1998-11). Parameters back-calculation for concrete pavement with two slab layers. Journal of Transportation Engineering 124 (6) : 567-571. ScholarBank@NUS Repository.
Abstract: This paper presents a new procedure for back-calculating the properties of a concrete pavement with two slab layers using deflection measurements from nondestructive deflection testing. The two slab layers are first represented by an equivalent single slab layer based on the principle of equivalent flexural rigidity. In the back-calculation analysis, the pavement deflection response under load is evaluated using an analytical model for a slab supported on an elastic foundation. Employing a closed-form back-calculation algorithm, it is shown that the back-calculated equivalent radius of relative stiffness and subgrade modulus are unique and independent of the characteristics of the two slab layers. It follows that the equivalent flexural rigidity for the two slab layers is also unique. The next step employs a trial-and-error algorithm to back-derive the moduli of the two slab layers by matching the equivalent flexural rigidity. An upper bound and a lower bound to the modulus can be established for the slab layer with the higher modulus. Similarly, an upper bound to the modulus can be found for the slab layer with the lower modulus. Four numerical examples are presented to demonstrate the use of the proposed back-calculation method.
Source Title: Journal of Transportation Engineering
URI: http://scholarbank.nus.edu.sg/handle/10635/65963
ISSN: 0733947X
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