INTERRELATIONS BETWEEN CEMENT AND CONCRETE PROPERTIES PART 2

THE RELATIONSHIPS BETWEEN THE CHEMICAL CHARACTERISTICS OF 183 PORTLAND CEMENTS AND THE EXPANSION OF MORTAR BARS MADE OF ONE PART CEMENT WITH 7.0 PERCENT SULFATE AND 2.75 PARTS GRADED OTTAWA SAND WERE STUDIED BY COMPUTING MULTIVARIABLE REGRESSION EQUATIONS WITH THE AID OF A DIGITAL COMPUTER AND DETERMINING WHICH OF THE INDEPENDENT VARIABLES HAD A SIGNIFICANT EFFECT ON THE EXPANSION VALUES. FOR CEMENTS CONTAINING 0 TO 9 PERCENT TRICALCIUM ALUMINATE A LINEAR RELATIONSHIP APPEARED ADEQUATE WHEREAS A HIGHER POWER OF THE TRICALCIUM CONTENT WAS REQUIRED WITH CEMENTS HAVING 7 TO 15 PERCENT TRICALCIUM ALUMINATE. THE PRINCIPAL VARIABLES OTHER THAN THE POTENTIAL TRICALCIUM ALUMINATE CONTENT ASSOCIATED WITH THE EXPANSION WERE THE FERRIC OXIDE CONTENT AND THE CALCIUM OXIDE/SILICON OXIDE RATIO. OF THE OTHER COMMONLY DETERMINED VARIABLES, THE LOSS ON IGNITION, INSOLUBLE RESIDUE AND POTASSIUM OXIDE CONTENT WERE ASSOCIATED WITH HIGH EXPANSION VALUES OF THE LOW TRICALCIUM ALUMINATE CEMENTS. CERTAIN MINOR CONSTITUENTS OR TRACE ELEMENTS SUCH AS STONTIUM OXIDE, COPPER, CHROMIUM, NICKEL, PHOSPHORUS, VANADIUM, AND ZINC ALSO APPEARED TO BE ASSOCIATED WITH THE EXPANSION VALUES OF THE CEMENTS. THE USE OF THE POTENTIAL TRICALCIUM SULFATE CONTENT OR THE COMPRESSIVE STRENGTH OF MORTAR CUBES AS VARIABLES INDICATED THAT HIGH SULFATE WAS ASSOCIATED WITH CEMENTS HAVING LOW EXPANSION VALUES AS DETERMINED BY THIS TEST. /AUTHOR/

  • Supplemental Notes:
    • No 5, 44 Pp, 9 FIG, 39 TAB, 4 REF
  • Corporate Authors:

    National Bureau of Standards /US

    ,    
  • Authors:
    • Blaine, R L
    • Arni, H T
    • Evans, D N
  • Publication Date: 1966-7

Subject/Index Terms

Filing Info

  • Accession Number: 00213686
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 3 1970 12:00AM