Ageing and performance of warm mix asphalt pavements

Christiane Raab, Ingrid Camargo, Manfred N. Partl
2017 Journal of Traffic and Transportation Engineering (English ed. Online)  
h i g h l i g h t s Long term ageing of energy reduced pavements was tested using different heating and watering cycles. Rutting behaviour revealed controversial results with most of the energy reduce pavements showing an increase in rut depth. Fatigue resistance was improved resulting in an increase of fatigue life for aged mixtures due to increasing binder stiffness. Warm mix asphalt (WMA) CO 2 emissions saving Ageing Long term performance Rutting Fatigue a b s t r a c t This paper presents
more » ... sults from investigating the ageing behaviour and performance of different warm mix asphalt (WMA) pavement mixtures also called energy reduced pavements. The mixtures were either prepared in the laboratory or taken directly from a mixing plant. The study compared the rutting and fatigue behaviours of unaged material in comparison to long term laboratory aged material. In order to conduct the long term ageing, a special laboratory ageing protocol with different heating, cooling and watering cycles had been developed. The investigation revealed a quite controversial rutting behavior which could not be explained with the available data. While most aged energy reduced pavements showed increased rutting for other mixtures, lower rut depths could be found. As opposed to this finding, fatigue and stiffness of all aged energy reduced pavement samples compared to unaged samples improved significantly. The overall results led to the conclusion that the ageing of energy reduced pavement simulated in the laboratory is not very critical regarding their mechanical performance. Therefore, it was confirmed that the application of this type of pavement provides a good solution for saving on CO 2 emissions. Another advantage is that by using energy reduced pavements the road construction season can be significantly prolonged. (I. Camargo), (M. N. Partl). Peer review under responsibility of Periodical Offices of Chang'an University. Available online at ScienceDirect journal homepage: www .e lsev ie m/ lo cate/ j tte j o u r n a l o f t r a f fi c a n d t r a n s p o r t a t i o n e n g i n e e r i n g ( e n g l i s h e d i t i o n ) 2 0 1 7 ; 4 ( 4 ) : 3 8 8 e3 9 4 http://dx.
doi:10.1016/j.jtte.2017.07.002 fatcat:nbrxc4wb75db3ew6fcdxdiqu2u