Accession Number : ADA131851

Title :   Detection of Cavities under Concrete Pavement,

Corporate Author : COLD REGIONS RESEARCH AND ENGINEERING LAB HANOVER NH

Personal Author(s) : Kovacs,Austin ; Morey,Rexford M

PDF Url : ADA131851

Report Date : Jul 1983

Pagination or Media Count : 50

Abstract : An evaluation of an impulse radar system for detecting cavities under concrete pavement is discussed, and field results are presented. It was found that a dual antenna mode of surveying was ideal for void detection. In this mode one antenna operated in a transceive mode and a second, offset from the first, operated in a receive-only mode. This arrangement allowed a refraction-type profile survey to be performed, which enabled subpavement voids to be easily detected. Field trails were held at Plattsburgh Air Force Base, where 28 cavities were detected and mapped. Drilling of holes verified that a cavity existed and allowed cavity depth to be measured. The cavities varied from 1.5 in. to 23 in, depth and were up to 20 ft. long. (Author)

Descriptors :   *Radar scanning, *Cavities, *Pavements, Detection, Subsurface, Foundations(Structures), Voids, Radar pulses, Transmitter receivers, Refraction, Radar antennas, Profiles, Holes(Openings), Radar signatures, Mapping, Air force facilities, Aprons, Runways

Subject Categories : Terminal Flight Facilities
      Civil Engineering
      Active & Passive Radar Detection & Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE