INTERRELATIONS BETWEEN CEMENT AND CONCRETE PRODUCTS PART 4

THE RELATIONSHIP BETWEEN CEMENT PROPERTIES AND DRYING SHRINKAGE OF PARTIALLY HYDRATED NEAT CEMENT PASTES OF NORMAL CONSISTENCY MADE OF A LARGE NUMBER OF PORTLAND CEMENTS OF DIFFERENT TYPES AND COMPOSITION WERE STUDIED BY FITTING MULTIVARIABLE REGRESSION EQUATIONS WITH THE AID OF A DIGITAL COMPUTER. THE TIME OF CRACKING OF ANNULAR SPECIMENS RESTRAINED FROM SHRINGKING BY A STEEL CORE VARIED FROM 0.1 TO MORE THAN 40 HOURS. THE PRINCIPAL VARIABLES WHICH APPEARED TO HAVE THE GREATEST EFFECT WERE THE FINENESS AND POTASSIUM OXIDE AND TRICALCIUM ALUMINATE FERRITE CONTENTS OF THE CEMENTS. THE FINENESS AND POTASSIUM OXIDE CONTENTS OF THE CEMENTS APPEARED TO HAVE GREATEST EFFECT ON THE NON-RESTRAINED SHRINKAGE OF PRISMS AT THE TIME OF CRACKING OF THE ANNULAR SPECIMENS. THE SHRINKAGE OF NEAT CEMENT BARS AFTER 1, 6, 27 DAYS, AND 6 MONTHS IN LABORATORY AIR DIFFERED GREATLY WITH DIFFERENT CEMENTS. THE PRINCIPAL VARIABLES APPEARED TO BE THE TRICALCIUM ALUMINATE, SULFATE AND TRICALCIUM ALUMINATE/SULFATE RATIOS. OTHER COMMONLY DETERMINED VARIABLES WERE ASSOCIATED WITH EACH OF THE ABOVE TEST VALUES. THE TRACE ELEMENTS. OTHER THAN SODIUM OXIDE AND POTASSIUM OXIDE WERE NOT GENERALLY ASSOCIATED WITH THE SHRINKAGE OR CRACKING CHARACTERISTICS. /AUTHOR/

  • Supplemental Notes:
    • 77 Pp, 8 FiG, 114 TAB, 6 REF
  • Corporate Authors:

    National Bureau of Standards /US

    ,    
  • Authors:
    • Blaine, R L
    • Arni, H T
    • Evans, D N
  • Publication Date: 1969-3

Subject/Index Terms

Filing Info

  • Accession Number: 00213685
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 3 1970 12:00AM