NONCONTACT MEASUREMENTS OF FOUNDATIONS AND PAVEMENTS WITH SWEPT-FREQUENCY RADAR
RADAR WAVES WILL BE PARTIALLY REFLECTED WHENEVER THEY ENCOUNTER A CHANGE IN ELECTRICAL PROPERTIES OF THE MATERIAL IN WHICH THEY ARE TRAVELING. BECAUSE HIGHWAY PROFILES ARE FORMED OF LAYERED MATERIALS WHOSE ELECTRICAL PROPERTIES DIFFER, REFLECTANCE CURVES, AS MEASURED WITH A SWEPT-FREQUENCY RADAR SYSTEM, WILL CONTAIN INFORMATION RELATING TO THE PHYSICAL PROPERTIES AND THE THICKNESSES OF THESE LAYERS. ANALYTICAL METHODS WERE DEVELOPED TO EXTRACT VALUES FOR THE ELECTRICAL PROPERTIES AND LAYER THICKNESSES FROM THE REFLECTANCE CURVES. THOSE METHODS ARE DEMONSTRATED ON THEORETICAL REFLECTANCE CURVES FROM TYPICAL PROFILES OF AN ASPHALT HIGHWAY AND A CONCRETE HIGHWAY. SWEPT-FREQUENCY RADAR MEASUREMENTS FROM EITHER AN AIR PLATFORM OR A LAND VEHICLE SHOW MUCH PROMISE FOR REDUCING BOTH COSTS AND TIME IN THE TESTING OF OLD CONSTRUCTION FOUNDATIONS AND IN THE CONTROL OF NEW CONSTRUCTION. /AUTHOR/
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Supplemental Notes:
- Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
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Authors:
- LUNDIEN, J R
- Publication Date: 1972
Media Info
- Media Type: Digital/other
- Features: Figures; References; Tables;
- Pagination: p. 40-49
- Monograph Title: Nondestructive testing of concrete
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Serial:
- Highway Research Record
- Issue Number: 378
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Concrete tests; Nondestructive tests; Pavement layers; Radar; Thickness
- Old TRIS Terms: Radar applications
- Subject Areas: Highways; Materials;
Filing Info
- Accession Number: 00214128
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Jun 5 1972 12:00AM