STATISTICAL ACCEPTANCE OF DENSE-GRADED BITUMINOUS MIXES BASED ON THE EXTRACTION OF PAVEMENT CORES
IN 1970 THE ILLINOIS DIVISION OF HIGHWAYS INITIATED ITS FRIST PRACTICAL APPLICATION OF AN "END RESULT" TYPE OF SPECIFICATION ON A BITUMINOUS RESURFACING PROJECT. NEARLY ALL RESPONSIBILITY FOR THE DESIGN, CONTROL, AND PLACEMENT OF MIX WAS PLACED ON THE CONTRACTOR. PAYMENT FOR THE COMPLETED PAVEMENT WAS BASED ON DATA OBTAINED FROM THE EXTRACTION OF THE UNCOMPACTED MIX AND FROM THE DENSITY AND THICKNESS OF THE COMPACTED PAVEMENT. FINDINGS INDICATE THAT THERE IS A MEAN SHIFT OF THE CORE DATA, ESPECIALLY FOR THE TOP SIZE OF AGGREGATE. ADJUSTING TARGET VALUES (MIX FORMULA) BY THESE DIFFERENCES INDICATES A VERY CLOSE CORRELATION BETWEEN THE MIX AND THE CORE EXTRACTIONS. IN A FEW CASES WHERE THERE WAS CONSIDERABLE DIFFERENCE BETWEEN THE MIX AND THE CORE EXTRACTIONS, THERE WAS USUALLY AS MUCH DIFFERENCES BETWEEN THE TESTING OF IDENTICAL MIX SAMPLES. THE STANDARD DEVIATION FOR THE CORE EXTRACTIONS, IN MOST CASES, WAS ABOUT THE SAME AS OR LESS THAN THAT FOR THE MIX EXTRACTIONS. BASED ON THE FINDINGS, CORE EXTRACTION TESTS COULD BE USED FOR THE ACCEPTANCE OF BITUMINOUS MIXTURES PROVIDED JUDGMENT IS USED IN ADJUSTING MIX FORMULA VALUES TO COINCIDE WITH THE MEAN DATA SHIFT DUE PRIMARILY TO THE CUTTING OF LARGER SIZED AGGREGATE DURING THE CORING OPERATION. /AUTHOR/
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Supplemental Notes:
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Authors:
- Gorman, R F
- Tunnicliff, D G
- Publication Date: 1972
Media Info
- Media Type: Digital/other
- Features: Figures; References; Tables;
- Pagination: p. 19-25
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Serial:
- Highway Research Record
- Issue Number: 385
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Acceptance tests; Asphalt pavements; Bituminous mixtures; Core samples; Dense graded aggregates; Mix design; Statistical analysis; Statistical quality control
- Old TRIS Terms: Cores
- Subject Areas: Construction; Data and Information Technology; Highways;
Filing Info
- Accession Number: 00215555
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Sep 30 1972 12:00AM