EFFECT OF SEGREGATION OF AN ASPHALTIC CONCRETE MIXTURE ON EXTRACTED ASPHALT PERCENTAGE
A LABORATORY EXPERIMENT WAS PERFORMED TO DETERMINE THE VARIATION IN EXTRACTED ASPHALT PERCENTAGES DUE TO SEGREGATION IN AN ASPHALTIC CONCRETE MIXTURE. FOUR PER CENT OF 85-100 PENETRATION ASPHALT WAS ADDED TO A COMBINED AGGREGATE CONSISTING OF PLATTE RIVER GRAVEL, FINE SAND, AND LIMESTONE DUST MINERAL FILLER. EXTRACTION TESTS WERE RUN ON A PORTION OF THE SAMPLE AND THE GRADATION OF THE EXTRACTED AGGREGATE WAS DETERMINED. THE REMAINING MIXTURE WAS THEN SCREENED OVER A NO. 4 SIEVE. THE SCREENING WAS VERY INEFFECTIVE SINCE MUCH OF THE -4 MATERIAL ADHERED TO THE LARGER PARTICLES. IN ORDER TO SIMULATE VARIOUS DEGREES OF SEGREGATION OF THE COARSE AND FINE FRACTIONS OF THE MIX, EXTRACTION AND GRADATION TESTS WERE ALSO PERFORMED ON THE MATERIAL RETAINED ON THE NO. 4 SIEVE, ON A MIXTURE OF 83 PER CENT RETAINED AND 17 PERCENT PASSING THE NO. 4, ON A MIXTURE OF 32 PERCENT RETAINED AND 68 PERCENT PASSING THE NO. 4 AND ON THE MATERIAL PASSING THE NO. 4 SIEVE. A REMARKABLY GOOD CORRELATION BETWEEN EXTRACTED ASPHALT PERCENTAGE AND GRADATION OF EXTRACTED AGGREGATE WAS OBTAINED. FROM THE RESULTS, IT APPEARS REASONABLE TO CONCLUDE THAT A SUBSTANTIAL PORTION OF VARIATION IN EXTRACTED ASPHALT PERCENTAGES MAY BE ATTRIBUTED TO SEGREGATION OF THE MIXTURE AFTER THE ASPHALT IS APPLIED. /AUTHOR/
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Supplemental Notes:
- Vol 36, pp 206-218, 5 FIG, 3 TAB
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Authors:
- Bryant, L J
- Conference:
- Publication Date: 1967-2
Subject/Index Terms
- TRT Terms: Aggregate gradation; Asphalt; Asphalt concrete; Chemical analysis; Correlation analysis; Gravel; Limestone dust; Mineral fillers; Mixtures; Percent; Resource extraction; Sand; Testing
- Uncontrolled Terms: Extraction (Chemistry); Segregation
- Old TRIS Terms: Gradation analysis
- Subject Areas: Data and Information Technology; Highways; Materials;
Filing Info
- Accession Number: 00210715
- Record Type: Publication
- Files: TRIS
- Created Date: Apr 2 1994 12:00AM