DEVELOPMENT OF A GROUND-PENETRATING RADAR TO DETECT EXCESS MOISTURE IN PAVEMENT SUBGRADE. FINAL REPORT

The objective of this study was to design, fabricate, test and evaluate the use of a ground-penetrating radar to detect excess moisture in the pavement subgrade. The radar transmit antenna emits electromagnetic waves some of which penetrate the pavement surface and reflect from the subgrade soil. The strength of the return wave, captured by the receiving antenna, is partially determined by the moisture content of the subgrade. Existing test methods involved core drilling a hole in the pavement and extracting a sample from the subgrade. The act of drilling a hole damaged the pavement, was very time consuming, introduced moisture into the subgrade and at best only gave information about soil conditions at the spot where the sample was obtained. The use of the ground-penetrating radar provides a non-destructive means to evaluate highway pavement subgrade for excess moisture from a moving platform. Thus data are provided for a longitudinal strip of subgrade rather than individual core hole locations. The radar in general does not yield quantified moisture levels but shows changes in moisture levels as it moves along the highway. With further evaluation and more advanced signal processing, the radar has the potential to become a valuable instrument for highway subgrade moisture analysis.

Language

  • English

Media Info

  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: 92 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00669052
  • Record Type: Publication
  • Report/Paper Numbers: K-TRAN: KU-91-1
  • Contract Numbers: KU-91-1 (108)
  • Files: TRIS, STATEDOT
  • Created Date: Nov 29 1994 12:00AM