A MERCURY POROSIMETRY STUDY OF THE EVOLUTION OF POROSITY IN PORTLAND CEMENT

THE PORE-SIZE DISTRIBUTION OF TWO HYDRATION SERIES OF CEMENT PASTES PREPARED AT WATER:CEMENT RATIOS OF 0.4 AND 0.6 WAS DETERMINED AS A FUNCTION OF AGE USING MERCURY POROSIMETRY. THE CONTACT ANGLE OF MERCURY ON THOROUGHLY DRIED PASTE WAS MEASURED AS 117 DEGREES; FOR "P"-DRIED PASTE IT WAS FOUND TO BE 130 DEGREES. IT WAS FOUND THAT MUCH OF THE PORE SPACE PRESENT AT ALL AGES OCCURRED IN PORES BETWEEN 0.1 AND 0.01; THAT IS, IN BETWEEN THE CONVENTIONAL NOTIONS OF "CAPILLARY" AND "GEL" PORE DIAMETERS. IT WAS FURTHER OBSERVED THAT PORE VOLUME LEFT UNINTRUDED BY MERCURY AT 15,000 PSI WAS SIGNIFICANTLY LESS THAN THE 28 PERCENT BY VOLUME THAT SHOULD BE PRESENT IN MATURE PASTES ACCORDING TO CURRENT NOTIONS OF THE NATURE OF CEMENT GEL. ON THE BASIS OF THESE OBSERVATIONS AND DIRECT EXAMINATION OF FRACTURE SURFACES OF CEMENT PASTE IT WAS CONCLUDED THAT MOST OF THE SPACE PRESENT IS NEITHER CONVENTIONAL "CAPILLARY" NOR CONVENTIONAL "GEL" SPACE BUT MERELY SPACE BETWEEN FINE INDIVIDUAL PARTICLES OF CEMENT HYDRATION PRODUCTS. /AUTHOR/

  • Supplemental Notes:
    • No 31, 24 PP, 11 FIG
  • Corporate Authors:

    Purdue University/Indiana Department of Transportation JHRP

    Purdue University, School of Civil Engineering
    West Lafayette, IN  USA  47907-1284
  • Authors:
    • WINSLOW, D N
    • Diamond, S
  • Publication Date: 1969-11

Subject/Index Terms

Filing Info

  • Accession Number: 00213677
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jun 15 1970 12:00AM