An empirical approach is used to validate the proposed Strategic Highway Research Program (SHRP) binder specification for thermal cracking. Binders extracted from the SHRP A-005 General Pavement Study sections are used to validate the proposed binder specification. The specification parameters at the required test temperatures were generated from the aged binders' master stiffness curves. Although the proposed specification parameters [creep stiffness (S) and slope of the binder stiffness curve (m) at 60-sec loading time] appear to be reasonable, the temperature ranges defined in Version 7G of the specifications are clearly too broad and result in a specification that is too restrictive. The defined limits on S and m are also too restrictive. Alternative limits are suggested for a specification with narrower temperature ranges. The binder specification was subsequently altered as a result of this and other work. The revised specification is also evaluated. The new specification structure and limits appear to be more effective.
|Number of pages
|Transportation Research Record
|Published - Oct 1 1994
All Science Journal Classification (ASJC) codes
- Civil and Structural Engineering
- Mechanical Engineering