CEMENT TREATED BASE CURING TEMPERATURE

A LABORATORY INVESTIGATION WAS CONDUCTED TO DETERMINE THE EFFECT OF FREEZING TEMPERATURES, DURING THE FIRST DAYS OF CURING, ON THE UNCONFINED COMPRESSIVE STRENGTH OF CEMENT TREATED BASE. AGGREGATES FROM FOUR SOURCES WERE SELECTED FOR TESTING ON THE BASIS OF VARYING CHARACTERISTICS. COMPRESSIVE STRENGTH DETERMINATIONS WERE USED TO COMPARE THE QUALITY OF SPECIMENS SUBJECTED TO FREEZING CONDITIONS AND SPECIMENS PREPARED AND CURED AT ROOM TEMPERATURE. TEST RESULTS SHOW THAT: (1) STRENGTH GAIN OF LABORATORY PREPARED CEMENT TREATED BASE (CTB) SPECIMENS IS DELAYED BY FREEZING TEMPERATURES DURING THE FIRST FEW DAYS FOLLOWING MIXING AND COMPACTION, (2) FREEZING TEMPERATURES DO NOT CAUSE A PERMENANT REDUCTION OF STRENGTH OF LABORATORY PREPARED CTB SPECIMENS, AND (3) THE ULTIMATE STRENGTH OF CTB MAY BE INCREASED BY THE USE OF COLD AGGREGATES AND WATER AT THE TIME OF MIXING. THESE CONCLUSIONS ARE VALID IF THE CTB IS WELL COMPACTED AND THE SURFACE OF THE CTB WAS NOT DAMAGED DURING THE TRIMMING OPERATION. THE CONCLUSIONS APPLY ONLY TO CEMENT TREATED MATERIALS WITH RELATIVELY LOW WATER AND CEMENT CONTENTS SUCH AS THOSE NORMALLY USED FOR CTB. RECOMMENDATIONS ARE MADE FOR CHANGING THE REQUIREMENTS FOR PROTECTING THE CTB DURING FREEZING WEATHER IN THE SPECIFICATIONS.

  • Supplemental Notes:
    • M&r No 643481, 18 PP, 9 FIG, 4 TAB, 4 REF
  • Corporate Authors:

    California Department of Transportation

    1120 N Street
    Sacramento, CA  USA  95814
  • Authors:
    • Sherman, G B
    • Gates, C G
  • Publication Date: 1970-4

Subject/Index Terms

Filing Info

  • Accession Number: 00232853
  • Record Type: Publication
  • Files: TRIS, STATEDOT
  • Created Date: Aug 3 1970 12:00AM