Graduate Thesis Or Dissertation
 

Improving Fatigue Cracking and Moisture Resistance of Asphalt Mixtures

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/6d570411v

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  • The resistance of asphalt concrete pavement to distresses such as fatigue cracking and permanent deformation is governed by how well the structure can resist loading under a variety of traffic and climate-related conditions. Asphalt binder type and content are typically the variables that pavement engineers can manipulate to render the pavement suitable for a given range of conditions. The increased use of recycled materials and additives in asphalt pavements, such as compaction aids, warm-mix additives, fibers, rubbers, reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS), is a well-established method of increasing the sustainability of roadway construction and rehabilitation, but it also creates challenges for pavement design in terms of preserving design life and longevity of the pavement. Also, a majority of the distresses in Oregon originate from moisture related damage due to frequent rain events. The major focus of this research was to develop a new mixture design methodology and a reliable asphalt mixture conditioning and testing method to evaluate moisture susceptibility for Oregon through three interrelated parts. Part I determines the effect of aramid fiber reinforcement on the cracking and permanent deformation (rutting) resistance of asphalt pavements. Additionally, it provides a method of combatting cracking issues in high RAP pavements, allowing DOTs, cities, and counties to use higher recycled material contents reliably, thereby increasing the sustainability of the asphalt pavement industry and reducing environmental impacts by reducing the need for virgin materials. In Part II, a balanced asphalt mix design method was developed for Oregon by incorporating performance tests for rutting Hamburg Wheel-Tracking Test (HWTT) and cracking Semi-Circular Bend (SCB) test into the current volumetric design process. In Part III, the most reliable asphalt mixture conditioning and testing method to evaluate moisture susceptibility was determined. The tools and test procedures developed in this research will help ODOT and other pavement agencies identify the benefits of recent additive and mix design technologies that are being developed to improve performance and also to combat moisture damage of asphalt mixtures.
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