EFFECTS OF ANGULAR SANDS ON PORTLAND CEMENT CONCRETE

THE COURSE OF THE LOW COMPRESSIVE STRENGTH OF CONCRETE COVES (REVEALED IN ROUTINE TEST RESULTS FROM A HIGHWAY PROJECT) WAS STUDIED. THREE DIFFERENT SANDS (WELL ROUNDED OTTOWA SAND; SEMI-ROUNDED OHIO RIVER SAND; AND ANGULAR JAMES RIVER SAND) WERE STUDIED TO DETERMINE THE EFFECTS OF THE PROPERTY OF ANGULARITY OF FINE AGGREGATES ON PORTLAND CEMENT CONCRETE. TWO-INCH MOTAR CUBES WERE USED INSTEAD OF CONCRETE CYLINDERS. SIEVE ANALYSIS, SPECIFIC GRAVITY, DELETERIOUS MATERIAL, AND SODIUM SULFATE SOUNDNESS DETERMINATIONS WERE MADE IN REPLICATE FOR EACH OF THE THREE SANDS. THE "FIXED FLOW" TEST AND THE VARIABLE FLOW TEST (IN BOTH OF WHICH THE AIR CONTENT AND DIFFERENCES IN THE MIXES WERE NOTED) ARE DETAILED. COMPRESSIVE STRENGTH TESTS WERE CONDUCTED AND RESULTS ARE PRESENTED. SIEVE ANALYSIS RESULTS SPHERICITY AND ROUNDNESS VALUES, MIX CHARACTERISTICS AND STRENGTH VALUES ARE TABULATED AND DISCUSSED. TESTS REVEAL THAT ANGULARITY OF THE GRAINS AFFECTS THE AIR CONTENT OF THE PLASTIC MIX. THE GRADATION OF THE SAND AFFECTS THE AIR CONTENT TO SOME DEGREE, BUT NOT SUFICIENT TO ENTIRELY EXPLAIN THE HIGHER AIR CONTENTS. THE AIR CONTENT HAS A DIRECT RELATIONSHIP WITH THE COMPRESSIVE STRENGTH OF A SPECIMEN. THE FLUIDITY INDEX INDICATE THAT THE ANGULARITY OF THE GRAINS AFFECTS THE WORKABILITY OF A MIX. EFFECTS CAUSED BY THE DEGREE OF ANGULARITY OF THE SANDS ARE REVIEWED AND IRREGULARITIES IN PREDICTABLE RELATIONSHIPS ARE DISCUSSED.

  • Corporate Authors:

    Hwy Geology Symposium Proc, 1972

    ,    
  • Authors:
    • Baldwin, J S
    • Dawson, J W
  • Conference:
  • Publication Date: 1972-4

Media Info

  • Features: Figures; Tables;
  • Pagination: p. 109-23

Subject/Index Terms

Filing Info

  • Accession Number: 00230223
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 24 1973 12:00AM