FIELD AND LABORATORY STUDIES ON THE REACTIVITY OF SAND- GRAVEL AGGREGATES

FIELD AND LABORATORY STUDIES HAVE SHOWN THAT THOSE SAND- GRAVEL AGGREGATES THAT ARE ASSOCIATED WITH THE DETERIORATION OF CONCRETE IN THE KANSAS-NEBRASKA REGION ARE ALKALI-SILICA REACTIVE, WHILE SAND-GRAVELS WITH GOOD SERVICE RECORDS ARE NOT. HOWEVER, THE TYPE OF CONCRETE DISTRESS THAT IS OBSERVED IN THE FIELD IS NOT ALWAYS TYPICAL OF THE DISTRESS GENERALLY ASSOCIATED WITH ALKALI-SILICA REACTIVITY. SUCH ATYPICAL PERFORMANCE IS BELIEVED ATTRIBUTABLE TO THE SEVERE DRYING CONDITIONS IN THAT PART OF THE COUNTRY, WHICH, THROUGH THE CONCENTRATION AND REDISTRIBUTION OF THE ALKALIES IN THE CONCRETE, MAY BRING ABOUT REACTION WITH CEMENTS OF LOW ALKALI CONTENT. THE CONCRETE DETERIORATION IS BELIEVED TO BE DUE TO THE COMBINED EFFECTS OF MODERATE INTERIOR EXPANSION, CAUSED BY ALKALI-SILICA REACTIVITY, AND SURFACE SHRINKAGE, CAUSED BY UNUSUALLY SEVERE DRYING CONDITIONS. /AUTHOR/

  • Supplemental Notes:
    • Vol 10, No 1, PP 17-33
  • Authors:
    • Hadley, D W
  • Publication Date: 1968-1

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  • Accession Number: 00217580
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 2 1994 12:00AM