GAP-GRADED VERSUS CONTINUOUSLY-GRADED AIR-ENTRAINED CONCRETE FOR HIGHWAY FACILITIES /TECH RPT NO 4/

THE OPTIMUM PROPORTION OF MATERIALS USED IN A MIX DESIGN ARE BEING DETERMINED TO ACHIEVE A SPECIFIED QUALITY WITH LEAST COST IS THE MOST IMPORTANT ASPECT IN THE PRODUCTION OF CONCRETE. PRESENTLY AVAILABLE METHODS FOR PROPORTIONING CONCRETE ARE BASED MOSTLY ON PREVIOUS EXPERIENCE. EVEN THEIR APPLICATION TO THE CONVENTIONAL CONTINUOUSLY-GRADED CONCRETE IS SHORT OF BEING OPTIMUM. IT HAS BECOME ESSENTIAL TO SEEK QUANTITATIVE INFORMATION FOR THE OPTIMUM PROPORTIONING OF GAP-GRADED AND CONTINUOUSLY-GRADED CONCRETES FOR VARIOUS SIGNIFICANT MIX PARAMETERS. IN THE PRESENT WORK INVOLVING 200 MIXES WITH TESTS CARRIED OUT ACCORDING TO ASTM STANDARD METHODS, THE RESULTS HAVE BEEN ANALYZED WITH AN OBJECTIVE TO REVEAL OPTIMUM MIX PROPORTIONS WITH RESPECT TO SUCH SIGNIFICANT MIX PARAMETERS AS CEMENT CONTENT, WATER-CEMENT RATIO, SIZE AND QUANTITY OF COARSE AGGREGATE, SIZE AND QUANTITY OF FINE AGGREGATE, AT PRACTICALLY THE SAME AIR CONTENT FOR BOTH GAP-GRADED AND CONTINUOUSLY-GRADED CONCRETES. THE OPTIMUM CEMENT CONTENTS FOR BOTH CONCRETES ARE ON THE BASIS OF EQUAL MAXIMUM SIZE OF COARSE AGGREGATE AND EQUAL COMPRESSIVE STRENGTH. THE COMPARISON HAS INVARIABLY SHOWN THAT MUCH LESS CEMENT IS REQUIRED FOR GAP-GRADED CONCRETE THAN ITS CONTINUOUSLY-GRADED COUNTERPART WITH APPROXIMATELY THE SAME WORKABILITY./AUTHOR/

  • Supplemental Notes:
    • Tech Rpt No 4, 642(68)
  • Corporate Authors:

    South Dakota School of Mines and Technology, Rapid City

    501 East St Joseph Street
    Rapid City, SD  United States  57701

    South Dakota Department of Transportation

    700 East Broadway Avenue
    Pierre, SD  United States  57501

    Bureau of Public Roads /US

    400 7th Street, SW
    Washington, DC  United States  20590
  • Authors:
    • Li, Shengbo Eben
    • Ramakrishnan, V
    • Rangan, B V
  • Publication Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 00212072
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS, STATEDOT
  • Created Date: Jul 14 1970 12:00AM