ASTM WK45231

    Revision of D7643 - 10 Standard Practice for Determining the Continuous Grading Temperatures and Continuous Grades for PG Graded Asphalt Binders

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    Active Standard: D7643 - 10

    Developed by Subcommittee: D04.44 | Committee D04 | Contact Staff Manager



    WK45231

    1. Rationale

    1.Use the word estimated to emphasize that continuous grade is an estimation not an exact value. 2.Simplified section 4.1 to improve clarity. 3.Removed some extraneous wording from section 6.1. 4.Added section 6.2.2 to emphasize the fact that the procedure is based on interpolation and not extrapolation. Frank asked if we could extrapolate slightly above and below the bracketing temperatures but after looking at some data I decided that it was not a good idea. Basically, defining how much extrapolation is allowed would be a difficult to define in the procedure. 5.Eliminated some of the plots in the appendix and replace the sample problems with table 1 shown in the attached file. I need to do a little tweaking on this file but this time the spreadsheet includes a column that indicates why the data are insufficient to generate continuous temperatures. I need to add some more examples which better illustrate the different types of errors.


    Keywords

    continuous grading temperature; continuous grade; performance graded binders (PG Grade); Asphalt binder; Continuous grade; Grading;
    Citing ASTM Standards
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    Work Item Status

    Date Initiated:
    02-28-2014

    Technical Contact:
    David Anderson

    Status:
    Draft Under Development