USE OF NEUTRON ACTIVATION TO DETERMINE CEMENT CONTENT OF PORTLAND CEMENT CONCRETE

MANY MILLIONS OF DOLLARS ARE SPENT EACH YEAR BY THE CONSTRUCTION INDUSTRY FOR PORTLAND CEMENT CONCRETE. THIS CONCRETE, PRODUCED BY A VARIETY OF CONCRETE MIXER DESIGNS, VARIES IN SPECIFIED QUALITY FROM LOW-STRENGTH CONCRETE USED IN UNSTRESSED MEMBERS TO HIGH-STRENGTH CONCRETE USED IN PRESTRESSED AND REINFORCED CONCRETE CONSTRUCTION. UNIFORMITY OF MIXING IS A GOOD CRITERION BY WHICH TO JUDGE THE QUALITY OF THE CONCRETE MIX AND MIXING ADEQUACY. IN THIS RESEARCH, CEMENT CONTENT OF MORTAR, FINENESS MODULUS OF THE AGGREGATE, ULTIMATE COMPRESSIVE STRENGTH, AND USUAL INSPECTION OF MIXING QUALITY WERE USED TO INDICATE THE UNIFORMITY OF THE MIXED CONCRETE. WITH THE EXCEPTION OF CEMENT CONTENT, ALL TESTS TO DETERMINE THE PHYSICAL CHARACTERISTICS OF THE CONCRETE WERE MADE BY CONVENTIONAL ASTM METHODS. CEMENT CONTENT OF THE CONCRETE MORTAR WAS DETERMINED BY NEUTRON ACTIVATION AND ANALYSIS OF CA49 PRODUCED IN THE CALCIUM IN THE PORTLAND CEMENT. THE METHOD OF CEMENT CONTENT DETERMINATION PROVED TO BE FEASIBLE AND COULD BE USED TO PREDICT THE CEMENT CONTENT WITHIN APPROXIMATELY PLUS OR MINUS 0.007 G 95 PERCENT OF THE TIME. ANALYSIS OF VARIANCE GENERALLY INDICATED THAT NO SIGNIFICANT EFFECT WAS OBSERVED FOR FINENESS MODULUS, ULTIMATE COMPRESSIVE STRENGTH, AND CEMENT CONTENT FOR THE MAIN EFFECTS OF MIXING TIME, REPLICATION, AND POSITION IN A CONCRETE MIXER FOR THE EXPERIMENT USED IN THIS RESEARCH. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Appendices; Figures; References; Tables;
  • Pagination: pp 1-29
  • Monograph Title: Construction of concrete pavement: methods, economics and tests
  • Serial:

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Filing Info

  • Accession Number: 00212650
  • Record Type: Publication
  • Files: TRIS, TRB, ATRI
  • Created Date: Jul 29 1994 12:00AM