Pavement performance is evaluated based on the "New Investigation on National Highways" concerning pavement structures and surface conditions, conducted by the Japanese Ministry of Construction since 1989. Combining performance curves and measured FWD deflections, a new performance model is proposed, taking structural adequacy of pavement into consideration. The proposed model is applied to National Route No.12, and an attempt is made to optimize pavement rehabilitation (overlay) strategy using Genetic Algorithm (GA) through FWD deflection measurements and performance prediction terms of Maintenance Control Index (MCI).
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