Effect of reclaimed bio-oil and waste crumb rubber on bitumen viscoelasticity

Abstract

ABSTRACT The application of reclaimed bio-oil has demonstrated many merits in modifying asphalt rubber (AR). However, the traditional rheological methods tend to be ineffective in scoring asphalt rubber modified by bio-oil (BoAR). This study aimed to assess how asphalt viscoelasticity is affected by the complicated interactions of three components in BoAR. Two different liquid additives were incorporated into AR utilizing three mixing sequences. Then the temperature and time dependence of these BoARs were investigated through the total dissipated energy function and process-accelerated fatigue testing, respectively. Furtherly, the master curves were constructed to detect their overall viscoelastic response. Finally, two evaluating methods, i.e. measured transition temperature and functional analysis region, were proposed by applying the time-temperature superposition principle (TTSP) and statistical methods. As a sequence, adding CRM tends to weaken the bitumen viscoelasticity, whereas the bio-oil presents the opposite result. Also, adjusting manufacturing processes utilizing liquid biological oil was proven a practical approach to optimizing the time-temperature sensibility of BoARs. In addition, the proposed rutting analysis region showed superior representativeness and practicability in evaluating the high-temperature properties of viscoelastic materials.