Identification of Elastic Response of Asphalt Pavements Layers Using Deflectometric Tests With Different Load Levels

It is a unusual practice in national new pavement designs and rehabilitations to consider the nonlinear elastic behavior of materials that constitute or will layers. However, linear response simplification actual layers behavior, since used structure have stiffness dependent on stress state (granular subgrade) temperature time load application (asphalt concrete). In view this, this paper aims study structures two monitored sites city Santa Maria/RS, through tests with FWD equipment, applying four different levels loading full extension these sites. structures, pavements showed tendency stiffening increasing acting at initial measuring distances (near point), which represent compression all make up pavement. The farther from point, referring subgrade, indicated, most cases, load-deflection relationship both backcalculated resilience modulus confirmed impressions drawn relationships, indicating granular (base sub-base) analyzed sites, directly proportional increase confining stress. subgrade experimental exhibited varied could be simplified by elasticity, without considerable loss. same fact happened for asphalt concrete material site 1. For 2, indicated vertical surface increment center plate.