THE EFFECTS OF EXPOSURE ON SOME FLUID BITUMENS
SEVEN LIQUID BITUMINOUS MATERIALS, SIX ASPHALTIC MATERIALS AND ONE WATER-GAS TAR WERE EXPOSED FOR ONE YEAR, BEGINNING IN JANUARY, IN THIN LAYERS TO THE ACTION OF AIR, LIGHT AND SOLAR HEAT IN GLASS-COVERED BOXES. THE REPORT SHOWS THE ROUTINE TESTS ON THE ORIGINAL MATERIALS, THE CHANGES IN WEIGHT AT THE END OF EACH 2 MONTH-EXPOSURE PERIOD, AND THE RESULTS OF CONSISTENCY, SOLUBILITY AND FIXED CARBON TESTS (ON ASPHALTIC MATERIALS ONLY) ON THE RESIDUES AFTER EACH EXPOSURE PERIOD. THE ORIGINAL MATERIALS WERE ALSO SUBJECTED TO THE STANDARD OVEN TEST FOR 5, 10 AND 15 HOURS AND THE RESIDUES WERE TESTED IN THE SAME MANNER AS THE RESIDUES FROM EXPOSURE. THE DATA OBTAINED, CORROBORATED AND AMPLIFIED ALL PREVIOUS DATA THAT BITUMINOUS MATERIALS UPON EXPOSURE UNDERGO CHANGES THAT ARE DUE TO SOMETHING MORE THAN MERE LOSS OF VOLATILE MATTER. IT WAS SHOWN THAT SIMILAR CHANGES OCCUR IN SAMPLES WHEN SUBJECTED TO THE STANDARD VOLATILIZATION TEST, ALTHOUGH CHANGES ARE GREATER WHEN THE EXPOSURES ARE MADE UNDER ATMOSPHERE INFLUENCES. AUTHORS CONCLUDE THAT WHILE OXYGEN PLAYS ITS PART IN THE CHANGES WHICH OCCUR, POLYMERIZATION AND INTERMOLECULAR REACTIONS INDUCED BY HEAT AND POSSIBLY INCREASED BY THE ACTION OF LIGHT ARE ALSO VERY LARGELY RESPONSIBLE FOR SUCH CHANGES IN ADDITION TO THOSE WHICH ARE ACCOUNTED FOR BY SIMPLE EVAPORATION.
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Supplemental Notes:
- Vol 9, P 743
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Authors:
- Reeve, C S
- Lewis, R H
- Publication Date: 1917
Media Info
Subject/Index Terms
- TRT Terms: Asphalt; Asphalt tests; Bituminous materials; Carbon; Chemical bond; Crash exposure; Fluids; Molecular structure; Ovens; Oxidation; Polymerization; Tar; Volatilization
- Uncontrolled Terms: Exposure
- Old TRIS Terms: Molecular attraction; Vaporizing
- Subject Areas: Highways; Materials; Safety and Human Factors;
Filing Info
- Accession Number: 00210934
- Record Type: Publication
- Source Agency: Highway Research Board Bibliography
- Files: TRIS
- Created Date: Jun 10 1994 12:00AM