Long-Term Aging of Asphalt Mixtures for Performance Testing and Prediction (2017) / Chapter Skim
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3 Aging has long been recognized as a major driver of distress for asphalt concrete and, by extension, asphalt pavements. Aging causes the material to stiffen and embrittle, which leads to a high potential for cracking.
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4 Long-Term Aging of Asphalt Mixtures for Performance Testing and Prediction The accurate characterization of asphalt mixture properties in terms of the service life of a pavement is becoming more important as more powerful pavement design and performance prediction methods are implemented. One example of such characterization is shown in Figure 1.
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Background 5 In addition, this procedure would allow long-term aging to be considered in terms of full-scale and accelerated pavement test results. Future research is suggested to establish a diffusion model framework that accounts for differences in asphalt mixture morphology (e.g., air voids, film thickness)
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6 Long-Term Aging of Asphalt Mixtures for Performance Testing and Prediction Although the laboratory aging of loose (uncompacted) asphalt mixtures has received less attention than compacted specimens, several studies recommend aging loose mixtures in the laboratory to simulate the aging of asphalt pavements instead of aging compacted specimens (Mollenhauer and Mouillet 2011, Van den Bergh 2011)
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From page 7... ...
Background 7 main shortcomings of PAV aging compared to oven aging is the amount of material that can be aged. Based on previous studies of loose mixture aging, in order to obtain uniform aging, a uniform thin layer of loose mix should be placed in the PAV, which reduces the capacity of the equipment to a very low level (around 1 kg)
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8 Long-Term Aging of Asphalt Mixtures for Performance Testing and Prediction AIPs can be divided into two main categories: chemical functional groups and rheological parameters. Chemical AIPs provide the most direct indicators of oxygen uptake and can be measured using Fourier transform infrared (FTIR)
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Background 9 A preliminary fundamentals-based, one-dimensional combined asphalt oxidation kinetics and diffusion model was developed at Texas A&M University. This model is referred to as the transport model (Lunsford 1994, Prapaitrakul 2009, Han 2011)
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10 Long-Term Aging of Asphalt Mixtures for Performance Testing and Prediction exp (3)
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Background 11 the complex physicochemical interactions between the asphalt binder and the aggregate (Moraes and Bahia 2015, Wu et al. 2014, Petersen 2009, Little et al.
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