Abstract
There are some difficulties attributed to the use of polymer modified binder (PMB) such as low storage stability, low workability, etc. Polymerized pellets (PP), which are added directly to the asphalt mixtures in the mixer of batch plants, are introduced as an alternative to PMB. In this paper, the viscoelastic, fracture, fatigue and low-temperature behavior of the PP modified mixtures were investigated using the direct tension cyclic fatigue, Semi-Circular Beam (SCB) fracture, dynamic modulus and the uniaxial thermal stress and strain tests (UTSST) on both aged and unaged specimens. The results were compared to mixtures containing PMB and control neat hot mix asphalt (HMA). The results indicated that using both polymers led to an improvement in the performance properties of asphalt mixtures, and aging had a substantial adverse impact on the fatigue and low-temperature cracking resistance of asphalt mixtures especially when modified with PMB or PP. The fatigue, low-temperature and fracture performance of the PP modified mixtures were either better than or equal to the mixtures containing PMB. However, the high aging susceptibility of the PP modified mixtures raises questions for further research.
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