A study on dynamic backcalculation and overlay design based on falling weight deflectometer (FWD) data is presented. Dynamic slab-ground theory (DSGT) was used for dynamic backcalculation of a pavement structure. A computer program based on DSGT generated theoretical dynamic deflections of the pavement. For the backcalculation of equivalent full-depth asphalt concrete (AC) thickness and subgrad…
Compaction is one of the most important factors affecting the future performance of asphalt pavement. Hot mixture asphalt materials exhibit significant time-dependent response under mechanical and thermal loadings, which can involve elastic, creep and plastic permanent deformation. The irreversible permanent deformation part will generate compaction. Foam-type model has been considered an effic…
This paper presents a numerical study of damage behavior of asphalt mixtures by using a three-dimensional (3D) micro-frame element network (MFEN) model and damage mechanics principles. Asphalt mixtures are composed of aggregates, mastic cement and air voids. The load carrying behavior is strongly related to the local microstructural load transfer between neighboring aggregate particles. The 3D …
Prediction models for pavement deterioration of major roads in Miyazaki Pre-fecture, Japan, using falling weight deflectometer (FWD) data are presented. The models would be incorporated in a pavement management system (PMS), for the prefecture, which is under development. At first, a relation between Japanese maintenance control index (MCI) and cumulative equivalent single axle loads (CESAL) wa…
This paper presents a comparison of pavement layer moduli determined from backcalculation with those measured in the laboratory on asphalt concrete (AC) and granular base materials. Deflection data and pavement materials obtained from two conventional flexible pavement structures were used. Pavement surface deflections were measured with a Falling Weight Deflectometer and were used in backcalcu…