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Title: Closed-form backcalculation algorithms for pavement analysis
Keywords: closed-form backcalculation algorithm, rigid pavement system, multi-layer flexible pavement system
Issue Date: 17-Jul-2009
Citation: BAGUS HARIO SETIADJI (2009-07-17). Closed-form backcalculation algorithms for pavement analysis. ScholarBank@NUS Repository.
Abstract: Many backcalculation algorithms based on multi-layer elastic theory and plate theory were developed to backcalculate the layer moduli of a flexible and rigid pavement system, respectively. Unfortunately, they do not always give the unique answer due to the use of iterative trial and error approach in developing the algorithms. In this study, a development and evaluation of closed-form backcalculation algorithms was proposed. The aims of this research were to examine the merits of currently available closed-form backcalculation algorithms, and develop a procedure to derive the composite modulus of subgrade reaction (composite k value) for a rigid pavement with a subbase layer using a suitable closed-form backcalculation algorithm; and to develop a closed-form backcalculation algorithm for multi-layer flexible pavement system. The results showed that the closed-form backcalculation algorithm, NUS-BACK, was suitable to evaluate the layer moduli of an infinite- and finite-slab rigid pavement system. The next result produced was the relationship of two radius of relative stiffness of different foundation model, namely lk-lEs and lk-lEs/sb relationship, was suitable to determine k and composite k values from their respective layer moduli Es; and Es and Esb. Another important achievement was the proposed closed-form backcalculation algorithms for three- and four-layer flexible pavement developed in this study, 3L-BACK and 4L-BACK, could produce slightly more accurate backcalculated moduli than those of other iterative-based backcalculation programs.
Appears in Collections:Ph.D Theses (Open)

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