EFFECT OF COMPOSITION OF ASPHALT ON ITS RHEOLOGICAL PROPERTIES
A 60-70 PENETRATION ASPHALT FROM VENEZUELAN CRUDE WAS SEPARATED INTO ASPHALTENE AND MALTENE. FOUR SYNTHETIC ASPHALTS WITH DIFFERENT PERCENTAGES OF ASPHALT WERE PREPARED BY COMBINING MALTENE WITH ORIGINAL ASPHALT. STRESS- STRAIN RELATIONSHIP OF THE SYNTHETIC ASPHALTS WAS DETERMINED, AT VARIOUS TEMPERATURES, BY USING A SLIDING PLATE MICROVISCOMETER. THE RESULTS OF THIS STUDY INDICATED THAT THERE IS A NEED TO CLEARLY DEFINE THE TERM VISCOSITY. IT WAS FOUND THAT AT HIGH TEMPERATURES AND HIGH RATES OF SHEAR THE THREE COMMONLY USED VALUES OF VISCOSITY-- PLASTIC VISCOSITY, APPARENT VISCOSITY AND VISCOSITY-- CANNOT BE DISTINGUISHED. HOWEVER, AT LOW TEMPERATURES AND SMALL RATES OF SHEAR, THE THREE VALUES DIFFER FROM EACH OTHER AND AN EASY CORRELATION OR INTERPRETATION OF THE RHEOLOGICAL BEHAVIOR OF DIFFERENT ASPHALTS WOULD NOT BE POSSIBLE UNLESS THE SHAPES OF STRESS-RATE OR STRAIN CURVES ARE KNOWN. FOR THE PARTICULAR ASPHALT USED, AN EQUATION WAS DEVELOPED TO CORRELATE THE PLASTIC VISCOSITY WITH THE ASPHALTENE CONTENT AND TEMPERATURES OF THE SYNTHETIC ASPHALTS. /NAPA/
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Supplemental Notes:
- Vol33, Pp320-340
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Authors:
- Moavenzadeh, F
- Brady, P F
- Conference:
- Publication Date: 1964-2
Subject/Index Terms
- TRT Terms: Asphalt; Asphaltene; Deformation curve; Rheological properties; Temperature; Viscometers; Viscosity
- Uncontrolled Terms: Separation
- Geographic Terms: Venezuela
- Old TRIS Terms: Maltene
- Subject Areas: Highways; Materials;
Filing Info
- Accession Number: 00210288
- Record Type: Publication
- Source Agency: National Asphalt Pavement Association (NAPA)
- Files: TRIS
- Created Date: Aug 4 1994 12:00AM