Nondestructive testing of asphalt pavements for structural condition evaluation: a state of the art

Nondestructive testing provides ideal means to test pavement structure in a rapid and convenient manner. In last few years, significant development has taken place in this field. This paper, presents some of the major conventional as well as emerging nondestructive evaluation methods for in situ structural assessment of asphalt pavements. Discussion of methods is primarily directed towards the estimation of layer moduli and thickness values which are direct indicators of the structural strength of pavement. Estimation of density, moisture content, etc. has not been emphasised in this paper.