An Evaluation of Warm Mix Asphalt Additives and Reclaimed Asphalt Pavement on Performance Properties of Asphalt Mixtures

摘要

The consumption of natural resources and climatic changes are regarded as key factors in thedeterioration and disruption of ecosystems and the asphalt paving industry has been working toaddress these issues. Two features of the efforts directed towards sustainability have been in theuse of warm mix asphalt (WMA) technologies and reclaimed asphalt pavement (RAP).The performance of three commonly used warm mix technologies: Advera, Evotherm J1 andSasobit were examined in comparison to a control HMA mixture with respect to dynamicmodulus and permanent deformation (flow number). Each mixture was developed using aperformance grade 64-22 binder and two types of aggregates: limestone or quartzite. In addition,this study will look into whether WMA additives enable the production of high RAP content(30%) mixtures with comparable performance to HMA.Warm mix asphalt mixtures were prepared at 120°C and compacted at 110°C showed noconcerns regarding workability or compactability even in mixtures incorporating 30% RAP.Dynamic modulus and flow number tests were conducted to assess the stiffness and permanentdeformation resistance, respectively.The performance tests data suggests that there is a significant difference in the performance ofHMA mixtures and the three WMA technologies investigated. Dynamic modulus data of WMAmixtures were consistently lower as compared to HMA. The incorporation of RAP increased thedynamic modulus of all mixtures but the HMA mixtures were still higher than the WMAmixtures. Finally, the rutting resistance of WMA mixtures was considerably lower compared toHMA mixes via flow number testing.