EXPERIMENTS USING INFRA-RED PHOTOGRAPHY FOR NON-DESTRUCTIVE TESTING
THE USE OF INFRARED PHOTOGRAPHIC TECHNIQUES FOR NON- DESTRUCTIVE TESTING DURING HIGHWAY CONSTRUCTION AS A SUPPLEMENT TO EXISTING METHODS IS ADVOCATED AND SUPPORTED BY EVIDENCE FROM LABORATORY TESTS WHOSE METHODOLOGY AND CONDUCT ARE DESCRIBED. THE PORTION OF THE IR SPECTRUM TO WHICH COLOR AND B/W FILMS ARE SENSITIVE LIES IN A NARROW BAND JUST OUTSIDE THE VISIBLE RANGE. WITHIN THIS BAND FOUR KINDS OF IR RADIATION CAN BE RECORDED: FROM THE OBJECT ITSELF, FROM AN OBJECT BENEATH OR WITHIN THE FIRST OBJECT (TRANSMITTED RADIATION), SURFACE REFLECTANCE, AND PHOSPHORESCENCE. TWO HYPOTHESES WERE TESTED: (1) FOR A GIVEN MATERIAL, THE AMOUNT OF IR RADIATION IS A FUNCTION OF THE DENSITY OF THE MATERIAL AND (2) SIMILAR BUT UNLIKE MATERIAL WILL TRANSMIT DIFFERENT AMOUNTS OF IR RADIATION. ("MATERIAL" MEANS A HOMOGENEOUS MIXTURE OF SEVERAL CHEMICALLY DIFFERENT SUBSTANCES, SUCH AS PCC, ASPHALTIC CONCRETE, AND SOILS.) THE FIRST SET OF TESTS WAS MADE WITH SOIL SAMPLES TAKEN FROM NEW MEXICO SITES THAT WERE SUBSEQUENTLY PHOTOGRAPHED IN AERIAL OVERFLIGHTS. A SECOND SET OF SOILS TESTS EMPLOYED MODIFIED "PROCTOR" (T-180) MOLDS. ADDITIONAL SETS OF TESTS WERE RUN WITH ASPHALT AND CONCRETE. RESULTS AND CONCLUSIONS ARE PRESENTED. THE HYPOTHESES SEEM SUFFICIENTLY DEMONSTRATED TO JUSTIFY CONTINUED RESEARCH, INCLUDING IMMEDIATE USE OF SUCH EQUIPMENT AS A BOOM TRUCK AND CAMERA ON A CURRENT HIGHWAY PROJECT.
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Corporate Authors:
University of New Mexico, Albuquerque
Eighth Paving Conference Proceedings
Albuquerque, NM United States 87131 -
Authors:
- Goodman, A F
- Publication Date: 1970
Subject/Index Terms
- TRT Terms: Asphalt; Concrete; Density; Electromagnetic radiation; Infrared photography; Infrared radiation; Laboratory tests; Nondestructive tests; Quality control; Road construction; Soils
- Old TRIS Terms: Quality control testing
- Subject Areas: Geotechnology; Highways; Materials;
Filing Info
- Accession Number: 00217149
- Record Type: Publication
- Report/Paper Numbers: pp 40-49
- Files: TRIS
- Created Date: Sep 13 1971 12:00AM