A STUDY OF 34-E PAVERS

THIS PAPER SUMMARIZES DATA OBTAINED IN 16 STUDIES OF THE MIXING OF PORTLAND CEMENT CONCRETE IN 34-E DUAL-DRUM PAVERS, CONDUCTED BY 13 STATE HIGHWAY DEPARTMENTS. DETERMINATIONS WERE MADE OF THE DESIRABLE TIME OF MIXING AND THE AMOUNT OF OVERLOAD WHICH COULD BE PERMITTED. THE RESULTS INDICATED THAT THE HIGHEST STRENGTHS WERE ATTAINED AT A 60-SEC. MIXING TIME, EXCLUSIVE OF TRANSFER TIME, AND THAT AN OVERLOAD OF 10 OR 20 PERCENT COULD BE TOLERATED. IT WAS ALSO FOUND THAT LITTLE LOSS IN STRENGTH OF THE CONCRETE RESULTED WHEN THE MIXING TIME WAS REDUCED TO 40 SEC. EXCLUSIVE OF TRANSFER TIME, BUT WHEN THE MIXING TIME WAS REDUCED TO 30 SEC. A LOSS IN STRENGTH OF 5 TO 6 PERCENT OCCURRED. A MIXING TIME OF MORE THAN 60 SEC. EXCLUSIVE OF TRANSFER TIME, WAS FOUND TO BE UNDESIRABLE BECAUSE IT INVOLVED WASTE OF EFFORT AND RESULTED IN LOSS OF STRENGTH WITHOUT GAIN IN THE UNIFORMITY OF THE CONCRETE. /AUTHOR/

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  • Accession Number: 00215099
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Apr 28 1994 12:00AM