HARDENED CEMENT PASTES OF LOW POROSITY: DIMENSIONAL CHANGES

LENGTH CHANGES WERE MEASURED FOR LOW-POROSITY HARDENED PORTLAND CEMENT PASTES OBTAINED FROM A TYPE I CLINKER USING TWO DIFFERENT GRINDING AIDS, AND FROM A TYPE II LINKER USING FOUR. THE WATER-CEMENT RATIO WAS 0.2. CURING TIMES FOR MOST PASTES WERE 1 AND 28 DAYS. THE PASTES WERE EXPOSED TO A RELATIVE HUMIDITY OF 42.7 PERCENT, AND FOR 30 DAYS LENGTH WAS MEASURED AT INTERVALS OF 1 DAY OR MORE. THE RESULTS SHOWED THAT THE TYPE II PASTES EXHIBITED CONSIDERABLY LESS SHRINKAGE THAN THE TYPE I PASTES AFTER 1 DAY OF CURING, BUT THAT AFTER 28 DAYS DIFFERENCES IN SHRINKAGE WERE SLIGHT, THAT SHRINKAGE DIFFERENCES DUE TO DIFFERENT GRINDING AIDS WERE SLIGHT, THAT PASTES OF CLINKERS GROUND TO SPECIFIC SURFACES OF ABOUT 6500 CM SQUARED/G SHOWED LESS SHRINKAGE THAN THOSE OF CLINKERS GROUND TO HIGHER SURFACES, AND THAT THE LOW-POROSITY PASTES SHOWED ONE-THIRD TO ONE-HALF AS LARGE LENGTH CHANGES AS PASTES MADE FROM THE SAME CEMENT WITH A WATER-CEMENT RATIO OF 0.4, AND ONE-FOURTH TO ONE- THIRD AS LARGE AS THOSE MADE WITH A WATER-CEMENT RATIO OF 0.6. THE MAIN CONCLUSION IS THAT VOLUME CHANGES CAN BE GREATLY REDUCED BY USING LOW-POROSITY CEMENT PASTES. /AUTHOR/

  • Supplemental Notes:
    • Res Rept 69-8, 12 PP
  • Corporate Authors:

    New York State Department of Transportation

    Engineering Research and Development Bureau, 1220 Washington Avenue
    Albany, NY  United States  12232
  • Authors:
    • Brunauer, S
    • Skalny, J
    • Yudenfreund, M
  • Publication Date: 1969-11

Subject/Index Terms

Filing Info

  • Accession Number: 00213680
  • Record Type: Publication
  • Files: TRIS, STATEDOT
  • Created Date: Jun 22 1970 12:00AM