LABORATORY FREEZE-THAW TESTS VS OUTDOOR EXPOSURE TESTS

THE RESULTS OBTAINED IN SUBJECTING MANY CONCRETES TO AN ACCELERATED LABORATORY FREEZING AND THAWING TEST CLEARLY INDICATED THAT BOTH AIR-ENTRAINMENT AND REDUCTION IN THE DEGREE OF SATURATION OF THE COARSE AGGREGATE WERE BENEFICIAL. TO OBTAIN AN ESTIMATE OF THE PERMANENCY OF THE INDICATED BENEFIT OF THESE TWO FACTORS FOR CONCRETES USED IN PAVEMENTS, AND TO EVALUATE THE ABILITY OF THE ACCELERATED FREEZING AND THAWING TEST TO PREDICT ACCURATELY THE RELATIVE DURABILITY OF CONCRETES MADE WITH SEVERAL COARSE AGGREGATES, MANY COMPARABLE CONCRETES WERE SUBJECTED TO A LONG-TIME OUTDOOR EXPOSURE TEST. AFTER 20 YEARS THE RESULTS OF THE OUTDOOR EXPOSURE TEST INDICATE THAT (1) USE OF AIR- ENTRAINMENT DID NOT SIGNIFICANTLY IMPROVE THE RESISTANCE OF ANY OF THE CONCRETES SUBJECTED TO OUTDOOR FREEZING AND THAWING IN THE ABSENCE OF DE-ICERS (IT DID, HOWEVER, SIGNIFICANTLY DECREASE THE FROST RESISTANCE OF CONCRETES CONTAINING COARSE AGGREGATES OF LOW RESISTANCE TO FREEZING AND THAWING), (2) ALTHOUGH THE FROST RESISTANCE OF CONCRETES PREPARED WITH PARTIALLY SATURATED COARSE AGGREGATES IS GENERALLY GREATER THAN THOSE IN WHICH SATURATED AGGREGATES WERE USED, THE AMOUNT OF IMPROVEMENT APPEARS TO VARY WITH SOME UNKNOWN PROPERTY (PROBABLY PORE STRUCTURE) OF THE COARSE AGGREGATE, AND (3) EXTREME CARE MUST BE EXERCISED IN USING THE RESULTS OF AN ACCELERATED FREEZING AND THAWING TEST TO PREDICT THE SERVICE PERFORMANCE OF CONCRETE IN PAVEMENTS. /AUTHOR/

  • Digital Copy:
  • Supplemental Notes:
    • Paper sponsored by Committee on Performance of Concrete--Physical Aspects and presented at the 48th Annual Meeting.
  • Authors:
    • Axon, E O
    • Murray, L T
    • Rucker, R M
  • Discussers:
    • Stark, David
    • Axon, E O
    • Murray, L T
    • Rucker, R M
  • Publication Date: 1969

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 35-45
  • Monograph Title: Portland cement concrete - sealers, durability creep, reactivity, and cement determination
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00213385
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Sep 22 1994 12:00AM