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Spirtual Common Sense Real Talk

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Abstract:Low-temperature cracking is a major form of distress that can compromise the structural integrity of asphalt pavements located in cold regions. A review of an Acoustic Emission (AE)-based approach is presented that is capable of assessing the low-temperature cracking performance of asphalt binders and asphalt pavement materials through determining their embrittlement temperatures. A review of the background and fundamental aspects of the AE-based approach with a brief overview of its application to estimate low-temperature performance of unaged, short-term, and long-term aged binders, as well as asphalt materials, is presented. The application of asphalt pavements containing recycled asphalt pavement (RAP) and recycled asphalt shingles (RAS) materials to thermal cracking assessment is also presented and discussed. Using the Felicity effect, the approach is capable of evaluating the self-healing characteristics of asphalt pavements and the effect of cooling cycles upon their fracture behavior. Using an iterative AE source location technique, the approach is also used to evaluate the efficiency of rejuvenators, which can restore aged asphalt pavements to their original crack-resistant state. Results indicate that AE allows for relatively rapid and inexpensive characterization of pavement materials and can be used towards enhancing pavement sustainability and resiliency to thermal loading.Keywords: acoustic emission; thermal cracking; asphalt pavements; embrittlement temperatures; recycled asphalt pavements; recycled asphalt shingles; cooling cycles

Abstract:Asphalt binder groups in the mid- and high-range of sustainable pavement applications are compounded with various low-temperature cracking resistant additives. Conventional wisdom holds that such additives should be present at a lower concentration to allow for beneficial interaction with the base binder; however, based on practical experience, it is often found to be beneficial to include additive packages at higher concentrations. This study successfully mounts such an interpretation. A methodology for producing fracture resistance and permeability of asphalt mixtures based on observed fracture temperature and penetration test slope for each specification grade is suggested and presented.Keywords:asphalt binders; low-temperature cracking; sustainable pavement d2c66b5586


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