CONCRETE RESEARCH ON CONCRETE PRODUCING PROPERTIES OF NORTH DAKOTA PIT-RUN AGGREGATES

NORTH DAKOTA HAS NUMEROUS DEPOSITS OF AGGREGATES THAT ARE UNSUITABLE FOR HIGH QUALITY CONCRETE PRODUCTION IN THIER ORIGINAL COMPOSITION AND CONDITION. SINCE UPGRADING OF THE AGGREGATES PROVED TOO COSTLY, UTILIZATION OF THIS ABUNDANT MATERIAL IN ITS ORIGINAL CONDITION WAS INVESTIGATED. SELECTED AGGREGATES REPRESENTATIVE OF MATERIAL TAKEN FROM TEN GRAVEL PITS LOCATED WITHIN VARIOUS HIGHWAY DISTRICTS OF THE STATE WERE USED TO PREPARE 16 CONCRETE MIXES OF VARYING CEMENT AND AIR CONTENT. FOR COMPARISON, SIMILAR MIXES WERE ALSO MADE USING STANDARD AGGREGATE. THE RESULTS SOUGHT WERE A MINIMUM COMPRESSIVE STRENGTH OF 2000 PSI FOR 28-DAY MOIST- CURED CEMENT AND NONFAILURE DURING THE 300 CYCLE FREEZE-THAW DURABILITY TEST (ASTM METHOD C-291). RESULTS ARE TABULATED ACCORDING TO MIX COMPOSITION, COMPRESSIVE STRENGTH, AND PERFORMANCE DURING DURABILITY TESTS. WITH SOME EXCEPTIONS, GOOD RESULTS WERE OBTAINED FOR AGGREGATES USING 6-8% AIR CONTENT AND 4-1/2 OR 6 SACKS OF CEMENT PER CUBIC YARD.

  • Supplemental Notes:
    • 215 Pp, 23 TAB, 136 FIG, 1 APP
  • Corporate Authors:

    University of North Dakota, Grand Forks

    Engineering Experiment Station
    Grand Forks, ND  United States  58202
  • Authors:
    • Dahlgren, C E
  • Publication Date: 1968

Subject/Index Terms

Filing Info

  • Accession Number: 00213438
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 16 1970 12:00AM