DETERMINATION OF ASPHALT CONTENT OF BITUMINOUS MIXTURES BY MEANS OF RADIOACTIVE ISOTOPES
WITH A PROPER COMBINATION OF RADIOATIVE ISOTOPES AND ELECTRONIC EQUIPMENT, IT IS POSSIBLE TO DETERMINE THE RELATIVE CONCENTRATION OF HYDROGEN IONS IN A BITUMINOUS MIXTURE. THE ONLY SOURCE OF HYDROGEN IONS IN A DRY BITUMINOUS MATERIAL IS THE BITUMEN ITSELF. THUS, IT IS POSSIBLE TO DETERMINE THE PERCENT OF BITUMEN IN A MIX FROM CURVES WHICH ARE BASED ON TESTS OF STANDARD SAMPLES. FROM DATA ACCUMULATED BY A 25-MILLICURIE SOURCE OF RADIUM-D BERYLLIUM AND AN ENRICHED BORON-FLUORID 10 COUNTING TUBE, A CURVE OF COUNTS OF SLOW NEUTRONS VS. ASPHALT CONTENT, IN POUNDS PER CUBIC INCH, IS PRESENTED FOR THE SAMPLES TESTED. ALSO SHOWN IS A FAMILY OF CURVES RELATING COUNTS OF SLOW NEUTRONS TO PERCENT OF ASPHALT BY WEIGHT FOR VARIOUS TOTAL UNIT WEIGHTS OF SAMPLES. A TABLE IS PRESENTED GIVING MIX DATA AND TEST RESULTS FOR ALL SAMPLES TESTED. IT IS CONCLUDED THAT A QUICK AND REASONABLY ACCURATE TECHNIQUE FOR DETERMINING ASPHALT CONTENT BY RADIOACTIVE ISOTOPES HAS BEEN FOUND. /AUTHOR/
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Supplemental Notes:
- Vol 35, pp 322-326, 2 FIG, 1 TAB, 3 PHOT, 1 REF. 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:
- Lamb, D R
- Zoller, J H
- Publication Date: 1956
Media Info
- Media Type: Digital/other
- Monograph Title: Proceedings of the Thirty-Fifth Annual Meeting of the Highway Research Board, Washington, D.C., January 17-20, 1956
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Serial:
- Highway Research Board Proceedings
- Volume: 35
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Asphalt content; Bituminous mixtures; Curves (Geometry); Electronic equipment; Hydrogen; Ions; Mix design; Neutrons; Radioisotopes; Tables (Data)
- Old TRIS Terms: Electronic devices
- Subject Areas: Highways; Materials;
Filing Info
- Accession Number: 00211634
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Aug 15 1971 12:00AM