EXPANDED SHALE USED AS AN ADMIXTURE FOR SAND-GRAVEL AGGREGATE CONCRETE

WHEN CERTAIN KANSAS SAND-GRAVEL AGGREGATES ARE USED FOR CONCRETE A CEMENT-AGGREGATE REACTION MAY TAKE PLACE WHICH IS EXHIBITED IN THE CONCRETE IN THE FORM OF EXPANSION, CRACKING AND FLEXURAL STRENGTH LOSS. IN THIS STUDY EXPANSION WAS THE PRIME CONSIDERATION. FIELD AND LABORATORY TESTS WERE CONDUCTED USING BOTH LIMESTONE AND EXPANDED SHALE AGGREGATES AS ADMIXTURES TO CONTROL THE CEMENT-AGGREGATE REACTION. IT WAS FOUND THAT: (1) IN THE FIELD TEST SECTIONS THE CONCRETE WITH THE EXPANDED SHALE AGGREGATE ADMIXTURE EXPANDED SLIGHTLY MORE THAN THE LIMESTONE AGGREGATE ADMIXTURE CONCRETE; (2) LABORATORY TESTS WHEN RELATED ONLY TO THE AGGREGATE ADMIXTURE TYPE SHOWED THE EXPANDED SHALE AGGREGATE CONCRETE; AND (3) THE ALKALI CONTENT OF THE CEMENTS DID NOT CORRELATE WELL WITH THE EXPANSION FAILURES OF THE LABORATORY SPECIMENS. LABORATORY PERFORMANCE OF THE CEMENTS WERE ABOUT EQUAL EXCEPT FOR ONE. THIS CEMENT HAD THE LOWEST AUTOCLAVE EXPANSION AND NO LABORATORY EXPANSION FAILURES. THE LIMESTONE ADMIXTURE CONCRETE PERFORMANCE VARIED WITH THE AUTOCLAVE EXPANSION OF THE CEMENTS. /AUTHOR/

  • Supplemental Notes:
    • 25 Pp, 8 FiG, 4 TAB, 7 REF, 1 APP
  • Corporate Authors:

    Kansas State Highway Commission

    Planning and Development Department
    , KS  USA 
  • Authors:
    • Bukovatz, J E
    • Wendling, W W
    • Wallace, H E
  • Publication Date: 1970

Subject/Index Terms

Filing Info

  • Accession Number: 00214022
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 10 1971 12:00AM