FLUCTUATIONS OF OPTIMUM BITUMEN CONTENT OBTAINED WITH MARSHALL STABILITY TEST

IN THE CASE OF DETERMINING THE BITUMEN CONTENT OF ASPHALTIC MIXTURES IN ACCORDANCE WITH THE MARSHALL STABILITY TEST, IT IS ASSUMED THAT THE FOLLOWING TWO HYPOTHESES HAVE BEEN ESTABLISHED: THE FIRST ONE IS THAT THE BITUMEN CONTENT OBTAINED WITH THE TEST SHOULD BE OPTIMUM; THE SECOND ONE IS THAT THE OPTIMUM BITUMEN CONTENT SHOULD CHANGE WITH THE PROPERTIES OF AGGREGATE TO BE USED, AND THE OPTIMUM BITUMEN CONTENT SHOULD BE NEARLY THE SAME IF THE AGGREGATES USED ARE THE SAME. NAMELY, THE SECOND ONE IS FOR TESTING ERRORS, AND IT IS ASSUMED THAT TESTING ERRORS ARE NEGLIGIBLY SMALL FROM THE PRACTICAL POINT OF VIEW WHEN THE OPTIMUM BITUMEN CONTENT IS OBTAINED WITH THE MARSHALL TEST. ACCORDING TO THE RESULTS OBTAINED WITH THE JOINT MARSHALL TEST BY 26 DIFFERENT LABORATORIES USING THE SAME MIXTURE DISTRIBUTED BY MINISTRY OF CONSTRUCTION IN 1965, THE ROOT OF CONSTANT DEVIATION OF THE FLUCTUATION OF OPTIMUM BITUMEN CONTENT IS ABOUT 0.5%. BY THIS FACT, WE SHOULD CONSIDER THAT EVEN IF THE MATERIALS USED ARE THE SAME, THERE IS PLUS OR MINUS FLUCTUATION OF OPTIMUM BITUMEN CONTENT (RELIABILITY 95%). IN OTHER WORDS, IT IS POSSIBLE TO SAY THAT THE BITUMEN CONTENT DETERMINED WITH THE MARSHALL TEST DOES NOT DEPEND UPON THE MATERIALS TO BE USED, BUT UPON THE LABORATORY WHICH CARRIED OUT THE TEST. AS A RESULT, PROBLEMS OF TEST ERROR BY THE MARSHALL TEST HAVE ARISEN. ACCORDINGLY, SUCH PROBLEMS WERE TAKEN UP BY PAVEMENT RESEARCH COMMITTEE UNDER COORDINATION OF ITS MEMBERS, AND THE INVESTIGATION OF THE TEST ERROR WHEN THE BITUMEN CONTENT IS DETERMINED BY THE MARSHALL TEST WAS EXAMINED BY FOUR SELECTED TEAMS USING THE SAME ASPHALT MIXTURE AND APPARATUS. /AUTHOR/

  • Supplemental Notes:
    • pp 49-57, 4 FIG, 8 TAB, 3 PHOT
  • Publication Date: 1968

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  • Accession Number: 00211469
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Mar 9 1970 12:00AM