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https://nap.nationalacademies.org/catalog/27432/critical-issues-in-transportation-for-2024-and-beyond

EFFECT OF HEAVY MEDIA SEPARATION ON DURABILITY OF CONCRETE MADE WITH INDIANA GRAVELS

ALTERNATE FREEZING AND THAWING ARE AMONG THE MOST DESTRUCTIVE OF THE NATURAL WEATHERING CONDITIONS TO WHICH CONCRETE IS SUBJECTED. INDIANA PAVEMENTS UNDERGO A LARGE NUMBER OF FREEZING AND THAWING CYCLES EACH YEAR, AND IN ADDITION, SEVERAL AGGREGATES OF QUESTIONABLE DURABILITY ARE FOUND IN THE STATE. THE JOINT HIGHWAY RESEARCH PROJECT AT PURDUE UNIVERSITY HAS, THEREFORE, DONE CONSIDERABLE RESEARCH CONCERNING THE FREEZING AND THAWING OF CONCRETE. IN 1946, WOODS, SWEET, AND SHELBURNE REPORTED RESULTS OF EXTENSIVE FIELD SURVEYS OF OVER 2,600 MILES OF RIGID PAVEMENTS CONSTRUCTED IN INDIANA PRIOR TO 1935. STATISTICAL ANALYSIS OF THE DATA INDICATED THAT THE FIELD PERFORMANCE OF THE PAVEMENTS WAS DIRECTLY RELATED TO THE SOURCE OF COARSE AGGREGATED USED. FURTHER INVESTIGATION REVEALED A RELATIONSHIP BETWEEN THE MINERALOGICAL CMPOSITION OF GRAVEL COARSE AGGREGATE AND PAVEMENT FIELD PERFORMANCES. IT APPEARED EVIDENT THAT THE AGGREGATES WHICH WERE SHOWN TO HAVE POOR FIELD PERFORMANCE MET, AND STILL WOULD MEET, MOST OF THE COMMONLY EMPLOYED ACCEPTANCE TESTS DEVELOPED FOR SPECIFICATION PURPOSES. THIS FACT GAVE IMPETUS TO MANY LABORATORY RESEARCH PROGRAMS DIRECTED TOWARD DEVELOPMENT OF A TEST, THE RESULTS OF WHICH COULD BE CORRELATED WITH FIELD PERFORMANCE. AMONG THESE PROGRAMS WAS A STUDY BY SWEET IN WHICH HE CONCLUDED THAT FREEZING AND THAWING TESTS COULD BE USED TO DIFFERENTIATE COARSE AGGREGATES WITH POOR FIELD PERFORMANCE FROM THOSE WITH GOOD PERFORMANCE. HE SUGGESTED THAT ALL COARSE AGGREGATES TESTED SHOULD BE PUT INTO CONCRETE AFTER BEING VACUUM SATURATED SO THAT THE MOSITURE CONDITION OF THE AGGREGATES WOULD BE SIMILAR TO THE DEGREE OF SATURATION THAT MAY BE ENCOUNTERED IN A PAVEMENT. USING SWEET'S CONCLUSIONS AND RECOMMENDATIONS, OTHER RESEARCH PROGRAMS WERE CONDUCTED. STUDIES OF THE EFFECT OF FREEZING AND THAWING ON AIR-ENTRAINED CONCRETE USING POOR AGGREGATES WERE CONDUCTED BY BUGG AND BLACKBURN. VENTERS FOUND THAT THE DELETERIOUS PORTIONS OF THE GRAVELS HAVE HIGH ABSORPTION AND A POTENTIALLY HIGH DEGREE OF SATURATION. HE WAS ABLE TO SEPARATE THE DELETERIOUS PARTICLES FROM THE GRAVELS BY MEANS OF HEAVY LIQUID FLOTATION. COMMERCIAL HEAVY MEDIA (OR HEAVY LIQUID SEPARATION METHODS NOW EXIST AND HAVE BEEN APPLIED SUCCESSFULLY TOWARD THE IMPROVEMENT OF CERTAIN GRAVELS. ALL OF THE STUDIES METNIONED HAVE PRODUCED LABORATORY DATA WHICH CAN BE CORRELATED WITH THE FIELD PERFORMANCE OF AGGREGATES, BUT IN EACH, EITHER ALL GRAVEL OR ALL CRUSHED STONE AGGREGATE WAS USED. INDIANA'S PRESENT FIELD PRACTICE, HOWEVER, IS TO BLEND CRUSHED STONE (FOR THE LARGER SIZES OF THE COARSE AGGREGATE) WITH GRAVEL. ALSO, THE DEVELOPMENT OF COMMERCIAL HEAVY MEDIA SEPARATION METHODS MAKES WORTHY OF CONSIDERATION THE MORE EXTENSIVE USE OF THESE METHODS FOR THE IMPROVEMENT OF GRAVEL AGGREGATES. THESE TWO FACTORS MERITED LABORATORY RESEARCH AND FORM THE BASIS OF THIS STUDY. /AUTHOR/

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  • Supplemental Notes:
    • No 143, pp 14-26, 6 FIG, 9 TAB, 16 REF Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
  • Authors:
    • Walker, Richard D
    • McLaughlin, J F
  • Publication Date: 1956

Media Info

  • Media Type: Digital/other
  • Pagination: 13p
  • Monograph Title: Freeze-thaw durability of aggregate in concrete
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00217782
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Jul 28 1994 12:00AM