EFFECT OF TEMPERATURE ON AIR-ENTRAINING ADMIXTURES DEMAND OF CONCRETE WITH AND WITHOUT POZZOLANS

MIXTURES WERE MADE WITH PORTLAND CEMENT, BLENDS OF PORTLAND CEMENT AND POZZOLAN, AND POZZOLAN ALONE, AT TEMPERATURE RANGES OF 40-45, 70-80, AND 90-100 F TO DETERMINE WHETHER INCREASING THE TEMPERATURE OF FRESHLY MIXED CONCRETE RESULTS IN AN INCREASED REQUIREMENT FOR AIR- ENTRAINING ADMIXTURE IN ORDER TO MAINTAIN A GIVEN LEVEL OF AIR CONTENT IN THE CONCRETE. THE RESULTS INDICATED THAT THE AMOUNT OF AIR-ENTRAINING ADMIXTURE (AEA) REQUIRED IN THE MIXTURE CONTAINING A LOW-CARBON FLY ASH AND NO CEMENT WAS AFFECTED VERY LITTLE IF AT ALL BY TEMPERATURE. IN ALL OTHER MIXTURES, THE AEA DEMAND WAS INCREASED WITH INCREASING TEMPERATURE. THE TEMPERATURE EFFECT WAS CONSIDERABLE IN THE MIXTURE CONTAINING THE POZZOLAN,' CALCINED SHALE, BETWEEN THE TEMPERATURE RANGES OF 40-45 AND 70-80 F. THE DATA ALSO SHOW THAT THE CARBON CONTENT OF FLY ASH AND TEMPERATURE EFFECTS ARE INTERRELATED. IT IS BELIEVED THAT THE EFFECT OF CARBON IS PRIMARILY PHYSICAL. /AUTHOR/

  • Supplemental Notes:
    • No C-68-1, 24 PP
  • Authors:
    • Tynes, W O
  • Publication Date: 1968-7

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  • Accession Number: 00213266
  • Record Type: Publication
  • Files: TRIS
  • Created Date: May 19 1994 12:00AM