ABSTRACT
The Incremental Repeated Load Permanent Deformation (iRLPD) test is specified in AASHTO TP 116. The test is improvement over the Flow Number test in several aspects. The main advantage of the iRLPD test is that it determines resistance of asphalt mixtures to rutting at any temperature and stress level in half an hour. In this study, a modified method of iRLPD test, which is performed on volumetric samples in unconfined mode, is introduced. The test determines High-Temperature Performance Grade (HTPG) of the mixture as well as grade bump for traffic level. The modified method is included as Method A in TP 116. Several different materials, including mixtures with modified binders and RAP/RAS, are tested according to the Method A and the results are correlated to the known properties of the binder and mastic.
