TWENTY-YEAR REPORT ON THE LONG-TIME STUDY OF CEMENT PERFORMANCE IN CONCRETE.

THE LONG-TIME STUDY OF CEMENT PERFORMANCE IN CONCRETE WAS UNDERTAKEN TO DETERMINE WHETHER ANY RELATIONSHIP EXISTS BETWEEN THE COMPOSITION, FINENESS, AND CONDITIONS OF MANUFACTURE OF THE TEST CEMENTS AND THE ABILITY OF THE CONCRETE IN WHICH THEY WERE USED TO RESIST DETERIORATION WHEN SUBJECTED TO EXTERNAL INFLUENCES SUCH AS WATER, SULFATE SOLUTIONS, TEMPERATURE CHANGES, AND HIGHWAY TRAFFIC WITH OR WITHOUT APPLICATION OF SALTS FOR ICE REMOVAL. MOST OF THE TEST STRUCTURES HAVE BEEN EXPOSED TO THEIR PARTICULAR ENVIRONMENTS FOR A LITTLE OVER 20 YEARS. SOME MORE RECENT PROJECTS WERE CONSTRUCTED IN 1949, 1958, 1959, AND 1961. THIS REPORT PRESENTS A REVIEW OF THE PERFORMANCE OF THE VARIOUS TEST CEMENTS AND CONCRETES AT THESE TEST PROJECTS, SUPPLEMENTING THE OBSERVATIONS MADE IN THE TEN-YEAR REPORT. AS HAS BEEN PREVIOUSLY REPORTED, NO CONSISTENT RELATION WAS FOUND BETWEEN COMPOSITION AND FINENESS OF THE CEMENTS AND THE BEHAVIOR OF CONCRETE EXPOSED TO FREEZING AND THAWING. DIFFERENCES IN MANUFACTURE DID NOT SIGNIFICANTLY AFFECT THE DURABILITY OF THE CONCRETE. RESISTANCE TO SULFATE ATTACK WAS INCREASED BY REDUCTION OF THE POTENTIAL TRICALCIUM ALUMINATE CONTENT OF THE CEMENT. THE EVIDENCE AFTER MORE THAN 20 YEARS OF EXPOSURE CONFIRMS THE EARLIER INDICATIONS THAT AIR- ENTRAINMENT PROVIDES SIGNIFICANTLY INCREASED ABILITY OF CONCRETE TO ENDURE FREEZING AND THAWING WITHOUT CONCRETE ELEMENTS SUBJECT TO CONTINUOUS SATURATION BY GROUND WATER. /RRL/A/

  • Supplemental Notes:
    • Pp1-36, 4fiG, 11TAB, 16PHOT, 14REF
  • Authors:
    • Hansen, W C
  • Publication Date: 1965-5

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Filing Info

  • Accession Number: 00212202
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Mar 24 1994 12:00AM