DETERMINATION OF DIFFERENCES IN TEMPERATURE IN CONCRETE ELEMENTS DURING HEAT CURING AND COOLING /IN GERMAN/

TEST RESULTS ARE PRESENTED AND THE FOLLOWING CONCLUSIONS DRAWN: (1) STRESSES WHICH OCCUR DURING THE HEATING PHASE REACH THEIR MAXIMUM VALUE AFTER APPROXIMATELY ONE HOUR; THEY RETAIN THIS VALUE FOR ABOUT ONE HOUR, THEN SLOWLY DIMINISH AND DISAPPEAR. WHETHER THOSE STRESSES ARE DANGEROUS FOR THE CONCRETE IS NOT KNOWN, AND FURTHER RESEARCH IS NEEDED ON THE SUBJECT. (2) DURING COOLING, THE LARGEST DIFFERENCES IN TEMPERATURE MUST BE EXPECTED IMMEDIATELY AFTER THE REMOVAL OF THE FORMWORK APPROXIMATELY THIRTY MINUTES AFTER THE END OF STEAM CURING. AFTER TWO TO TWO AND A HALF HOURS, THESE DIFFERENCES IN TEMPERATURE HAVE DECREASED BY 50 PERCENT OF THEIR MAXIMUM VALUE. IF THE CONCRETE ELEMENT REMAINS IN THE FORMWORK FOR A LONGER TIME, THE TWO TO TWO AND A HALF HOURS QUOTED CAN BE LENGTHENED. (3) ATMOSPHERIC CONDITIONS (WIND AND RAIN) HAVE A VERY GREAT INFLUENCE ON THE ORDER OF MAGNITUDE OF THE STRESSES CAUSED BY THE TEMPERATURE. IT IS ADVISABLE TO PROTECT FRESH CONCRETE AGAINST THESE EFFECTS 2 TO 3 HOURS AFTER THE END OF STEAM CURING. (4) FAIRLY LOW AIR TEMPERATURES HAVE NO GREAT EFFECT DURING THE COOLING PHASE ON THE MAGNITUDE OF DIFFERENCES IN TEMPERATURE. BUT, IF COMBINED WITH WIND AND RAIN, IT CAN RESULT IN HIGHER VALUES STILL. /LCPC/RRL/

  • Supplemental Notes:
    • Vol 1-2, pp 95-102, 6 FIG, 1 TAB, 4 REF
  • Corporate Authors:

    Wiss Z Hochschule Verkehrwesen /Ger

    ,    
  • Authors:
    • Wagner, K
  • Publication Date: 1967

Subject/Index Terms

Filing Info

  • Accession Number: 00212907
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: May 10 1971 12:00AM