SURFACE CRACKING OF MASS CONCRETE STRUCTURES AT EARLY FORM REMOVAL

BASED ON A RHEOLOGICAL MODEL, WITH A DEFORMATIONAL BEHAVIOR SIMILAR TO THAT OF CONCRETE, AN EQUATION HAS BEEN DERIVED WHICH RELATES CRACKING OF CONCRETE TO RATE OF DEFORMATION, TENSILE STRENGTH OF CONCRETE, DEFORMATIONAL PROPERTIES OF CONCRETE, AND TIME. AN APPROXIMATIVE CALCULATION REVEALED A SERIOUS RISK OF SURFACE CRACKS DUE TO TEMPERATURE GRADIENTS IF FORMS ARE REMOVED TOO EARLY AT LOW TEMPERATURES FROM NEWLY CAST MASS CONCRETE STRUCTURES. HOWEVER, RESULTS OF FIELD TESTS SHOWED THAT THESE SURFACE CRACKS ARE SO SHALLOW THAT THEY ARE OF NO PRACTICAL IMPORTANCE. IT IS CONCLUDED THAT INSULATION OF FORMS FOR MASS CONCRETE STRUCTURES AND LATE FORM REMOVAL AT LOW TEMPERATURES ARE UNNECESSARY PRECAUTIONS FOR WHAT CONCERNS SURFACE CRACKING. IN SOME CASES IT MAY BE NECESSARY TO TAKE SUCH PRECAUTIONS IN ORDER TO AVOID STRUCTURAL CRACKING. /AUTHOR/

  • Supplemental Notes:
    • No 28, pp 145-153
  • Authors:
    • Hansen, T C
  • Publication Date: 1965-9

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  • Accession Number: 00212446
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 18 1994 12:00AM