INTERRELATIONS BETWEEN CEMENT & CONCRETE PROPERTIES - PART III, SECTION 8, COMPRESSIVE STRENGTH OF STEAM-CURED PORTLAND CEMENT MORTARS

THE RELATIONSHIPS BETWEEN THE CHEMICAL AND PHYSICAL CHARACTERISTICS OF 161 PORTLAND CEMENTS AND THE COMPRESSIVE STRENGTHS OF 2-INCH MORTAR CUBES MADE FROM THOSE CEMENTS AFTER BOTH LOW-AND HIGH-PRESSURE STEAM, AS WELL AS MOIST- AIR CURING, WERE STUDIED BY COMPUTING MULTIVARIABLE REGRESSION EQUATIONS WITH THE AID OF A DIGITAL COMPUTER, AND DETERMINING WHICH OF THE INDEPENDENT VARIABLES APPEARED TO HAVE A SIGNIFICANT RELATIONSHIP TO THE COMPRESSIVE-STRENGTH VALUES. AN INCREASE IN TRICALCIUM ALUMINATE, SULFUROUS OXIDE, AND POTASSIUM OXIDE EACH APPEARED ASSOCIATED WITH HIGHER COMPRESSIVE STRENGTHS WITH THE LOW-PRESSURE-STEAM- CURED SPECIMENS BUT NOT WITH 28-DAY STRENGTHS OF THE 23 C MOIST-AIR-CURED SPECIMENS. INCREASES OF TRICALCIUM ALUMINATE, TRICALCIUM SULFATE, DICALCIUM SULFATE, SULFUROUS OXIDE AND FINENESS WERE ALL ASSOCIATED WITH HIGHER STRENGTH VALUES WHEN AUTOCLAVE CURING WAS STARTED AFTER 5 HOURS, BUT WHEN STARTED AFTER 24 HOURS, VARIATIONS OF NEITHER TRICALCIUM ALUMINATE NOR TRICALCIUM SULFATE APPEAR TO HAVE ANY EFFECT. THE USE OF CERTAIN OF THE TRACE ELEMENTS IN THE EQUATIONS TOGETHER WITH COMMONLY DETERMINED VARIABLES RESULTED IN A REDUCTION IN VARIANCE ALTHOUGH THE COEFFICIENTS OF THE INDIVIDUAL TRACE ELEMENTS WERE, IN MOST INSTANCES, NOT HIGHLY SIGNIFICANT. /AUTHOR/

  • Supplemental Notes:
    • No 8, pp 67-98, 8 FIG, 35 TAB, 23 REF
  • Corporate Authors:

    National Bureau of Standards /US

    /Building Science Series
    ,   United States 
  • Authors:
    • Blaine, R L
    • Arni, H T
    • Defore, M R
  • Publication Date: 1968-4

Subject/Index Terms

Filing Info

  • Accession Number: 00213274
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Nov 15 1994 12:00AM