Abstract
Fatigue cracking is an important concern when a high percentage of Reclaimed Asphalt Pavement (RAP) is used in an asphalt mixture. The aging of the asphalt binder reduces its ductility and makes the pavement more susceptible to cracking. Rejuvenators are often added to high-RAP mixtures to enhance their performance. The aging of a rejuvenated binder is different from virgin asphalt. Therefore, the effect of aging on a recycled asphalt mixture can be different from its effect on a new one. This study evaluated the cracking resistance of 100% recycled asphalt binders and mixtures and investigated the effect of aging on this performance parameter. The cracking resistance of the binder samples was tested by a Bending Beam Rheometer. An accelerated pavement weathering system was used to age the asphalt mixtures and their cracking resistance was evaluated by the Texas Overlay Test. The results from binder and mixture tests mutually indicated that rejuvenated asphalt has a significantly better cracking resistance than virgin asphalt. Rejuvenated mixtures generally aged more rapidly, and the rate of aging was different for different rejuvenators.
Highlights
The use of asphalt pavement recycling methods as alternatives to milling and resurfacing has increased significantly in recent years [1]
The cracking resistance of rejuvenated binders was assessed by Bending Beam Rheometer (BBR) testing, and aging of the binder was simulated by a Pressure Aging Vessel (PAV)
The aging of the mix was simulated by the Accelerated Pavement Weathering System (APWS), and changes in the cracking resistance were studied
Summary
The use of asphalt pavement recycling methods as alternatives to milling and resurfacing has increased significantly in recent years [1]. Pavement recycling can result in benefits such as cost savings, decreasing the demand for new material and minimizing emissions due to material transportation [2]. Some asphalt recycling methods, such as Hot In-place Recycling (HIR) and Cold In-place Recycling, require incorporating 100% or close to 100% Reclaimed Asphalt Pavement (RAP) material [1]. A properly recycled pavement should have a good initial performance, compared to a new pavement, and its performance should not drop faster than that of a new pavement. In-place recycled pavements often use 100% or close to 100% RAP material. Their behavior can be different from new mixtures.
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