Synthesis Study of Nondestructive Testing Devices for Use in Overlay Thickness Design of Flexible Pavements

摘要

This report is prepared to provide a ready reference for highway engineers who are interested in purchasing nondestructive testing (NDT) equipment for use in designing overlays for flexible pavements. All commercially available equipment is described in the report. Information includes basic descriptions plus current prices quoted by the manufacturers/distributors. To determine user comments, a questionnaire was sent to nine State agencies, and one Federal agency. The responses to these questionnaires are summarized. Overlay thickness design procedures for flexible pavements are reviewed. Important components related to the use of NDT deflection measurements in overlay design are identified and addressed. Summary tables of equipment characteristics and overlay design procedures are presented.