CONTROL BITUMINOUS ANALYSIS BY PROCESS

A STATISTICALLY BASED PLAN IS EVALUATED FOR THE ACCEPTANCE OF BITUMINOUS HOT MIX USING CONTROL TEST EXTRACTION DATA FROM PAST CONSTRUCTION ON NINE PROJECTS. PARAMETER DATA OBTAINED FROM PREVIOUS RESEARCH WAS USED TO ESTABLISH LIMITS FROM THE JOB MIX AIM (TARGET) FOR AC CONTENT AND GRADATION. MIX WAS CONSIDERED ACCEPTABLE AT FULL PRICE WHEN FAILURES TOTALLED TWO OR LESS PER LOT FOR ANY OF THE ESTABLISHED 30 DEGREE LIMITS FOR (1) INDIVIDUALS, (2) MEANS OF 5, AND (3) RANGE OF 5. REDUCED PAYMENT WAS PROVIDED FOR LOTS HAVING 3 OR MORE FAILURES. PREMIUM PRICE ADJUSTMENT WAS PROVIDED FOR LOTS HAVING SUPERIOR CONTROL AND HAVING NO FAILURES WHEN STANDARD DEVIATION WAS ARBITARILY REDUCED BY UP TO 1/2 OF THAT USED IN ESTABLISHING ACCEPTANCE LIMITS. ABOUT 90 PERCENT OF THE 200 PLUS LOTS EXAMINED WOULD HAVE BEEN ACCEPTED AT FULL PRICE. FIFTY SIX LOTS WOULD HAVE QUALIFIED FOR PREMIUM PAY HAD THE STANDARD DEVIATION BEEN REDUCED BY 1/4; HOWEVER, ONLY 4 LOTS WOULD HAVE QUALIFIED HAD THE STANDARD DEVIATION BEEN HALVED. /BPR/

• Supplemental Notes:
  • No 471, No 4601-072
• Corporate Authors:

  Maine State Highway Commission

  Materials and Research Division, Bureau of Highways
  Augusta, ME  United States  04330

  Bureau of Public Roads /US

  400 7th Street, SW
  Washington, DC  United States  20590
• Authors:
  • Day, P B
• Publication Date: 0

Subject/Index Terms

• TRT Terms: Acceptance sampling; Acceptance tests; Adjustment factors; Aggregate gradation; Asphalt concrete; Bituminous mixtures; Equipment maintenance; Hot mix asphalt; Prices; Process control
• Uncontrolled Terms: Equipment adjustment
• Old TRIS Terms: Gradation
• Subject Areas: Construction; Highways; Maintenance and Preservation; Materials;

Filing Info

• Accession Number: 00210439
• Record Type: Publication
• Source Agency: Bureau of Public Roads /US
• Files: TRIS
• Created Date: Jul 6 1970 12:00AM