Validation of a Performance-Based Mix Design Method for Porous Friction Courses (2021) / Chapter Skim
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3 C H A P T E R 2 State of Practice Findings of NCHRP Project 01-55 Survey In 2015, NCAT conducted a survey of state agencies to determine those that were using PFC mixtures, the mix design procedures used, the primary forms of distress for those mixes, and any improvements that had been made to address the observed distresses. Results from that survey were included in NCHRP Research Report 877, Performance-Based Mix Design of Porous Friction Courses, (Watson et al., 2018)
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4 sponsored research. The changes are generally related to materials selection, laboratory performance test procedures, and construction practices, as discussed below.
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5 Moisture Test. The large volume of water channeled through a PFC layer increases the potential for stripping of the asphalt from the aggregate particle.
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6 Design air voids. Air voids may be determined by either the vacuum sealing method (AASHTO T 331)
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7 In addition, I-FIT can be used according to Illinois Test Procedure 405 for optional cracking evaluation with a proposed minimum FI value of 25, and HWT can be used for the optional rutting susceptibility test with the following proposed number of cycles to failure (12.5 mm rut depth)
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8 Construction. Only a less-tracking hot applied tack coat, or PG 64-22 binder, may be used for tack coat.
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9 Tennessee The Tennessee Department of Transportation began reuse of PFC mixtures about four years ago, and generally follows NAPA IS-115 guidelines for mix design. Tennessee is somewhat unique in that TNDOT allows either the 50-blow Marshall method or 50-gyration method for laboratory compaction of mixtures.
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