ASTM D4695-03 (R2020) PDF Download

ASTM D4695-03 (R2020) is a standard guide that provides procedural information for measuring pavement surface deflections. The purpose of this measurement is to obtain information that can be used for the structural evaluation of new or in-service pavements. The standard outlines the various pavement characteristics that can be determined through deflection measurements, including the modulus of each layer, overall stiffness of the pavement system, load transfer efficiency of PCC pavement joints, modulus of subgrade reaction, effective thickness/structural number/soil support value, and bearing capacity/load carrying capacity of a pavement.

These measurements can be used for various purposes such as the analysis and design of reconstructed and rehabilitated flexible and rigid pavements, pavement structural adequacy assessment, void detection in PCC pavement, and network structural inventory purposes. The guide describes the procedures for measuring deflections using different testing devices and provides general information that should be obtained regardless of the type of testing device used. It is applicable for deflection measurements performed on flexible asphalt concrete (AC), rigid portland cement concrete (PCC), or composite (AC/PCC) pavements.