LABORATORY FREEZING AND THAWING TESTS - A METHOD OF EVALUATING AGGREGATES?

A STUDY WAS CONDUCTED OF THE EFFECTS OF AGGREGATES ON THE FREEZING AND THAWING DURABILITY OF CONCRETE. CONCRETES WERE MADE WITH FIFTY-SIX DIFFERENT COARSE AGGREGATES AND EXPOSED TO ASTM C291 RAPID FREEZING IN AIR AND THAWING IN WATER. THE DATA SHOW THAT THE RESULTS OF ROUTINE SOUNDNESS AND ABRASION TESTS DID NOT CORRELATE WITH A LABORATORY FREEZING AND THAWING TEST OF HIGHLY SATURATED CONCRETE. ALTHOUGH THE RELATIONSHIPS WERE DEFICIENT IN PRECISE QUANTITATIVE SIGNIFICANCE, DURABILITY DECREASED WITH INCREASED ABSORPTION OF THE COARSE AGGREGATE, PERCENTAGE OF LIGHTWEIGHT PARTICLES, PERCENTAGE OF CHERT, PERCENTAGE OF LIGHTWEIGHT CHERT, AND PERCENTAGE OF DELETERIOUS PARTICLES. THE MOISTURE CONDITIONING OF THE AGGREGATE PRIOR TO INCORPORATION IN CONCRETE AND OF THE CONCRETE PRIOR TO EXPOSURE TO FREEZING AND THAWING ARE OF FUNDAMENTAL IMPORTANCE. LABORATORY FREEZING AND THAWING TESTS OF CONCRETES INCORPORATING THE AGGREGATES APPEAR TO OFFER CONSIDERABLE PROMISE. HOWEVER, TOO LITTLE IS KNOWN ABOUT MOISTURE CONTENT AND DISTRIBUTION OF CONCRETE IN FIELD EXPOSURES TO PERMIT ACCURATE SIMULATION IN THE LABORATORY.

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Filing Info

  • Accession Number: 00213341
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 28 1994 12:00AM