Graduate Thesis Or Dissertation
 

The effect of mixing moisture, oxidative aging and tire pressures on the performance of asphalt mixes

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/5712m9107

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  • The research undertaken consisted of the study of three topics affecting the performance of asphalt concrete mixtures, that is, mixing moisture, oxidative aging and higher tire pressures and axle loads. This thesis presents the findings of the research comprising these three topics. In the first study, the effects of mixing moisture (0,1,3%) and additives (lime, Pavebond Special) on performance of asphalt mixtures were evaluated using repeated load diametral testing of laboratory samples in terms of resilient modulus, fatigue life, and permanent deformation. To evaluate the long-term durability of mixes, the modified Lottman conditioning procedure was used. Test results show that inferior performance occurred for mixes with 3% moisture and the addition of lime resulted in distinct improvement of performance for moist mixtures. In the second study, the effects of oxidative aging on asphalt mixtures used in the construction of three projects in Oregon were evaluated. The repeated load diametral test for mixtures and Fraass test for asphalt cements were used. A modified Pressure Oxidation Bomb (POB) laboratory accelerated aging method with pure oxygen was adopted. As evaluation parameters, the modulus ratio and Fraass breaking temperature are good indicators of the aging rate of mixtures and asphalt cements, respectively. The third study, the effect of increased axle loads and tire pressures of trucks on the performance of asphalt concrete pavements, included a survey of existing truck operating characteristics in Oregon and an investigation of the current mix design criteria. In particular, stability of asphalt mixtures was evaluated. Six different aggregate gradations including the Fuller maximum density gradation using aggregate from four different sources were used. The correlation analyses between creep behavior and mix design criteria of asphalt mixtures were made. The results of the survey showed that 87% of the tires were of radial construction, and the average measured tire pressures of radial and bias are 102 and 82 psi, respectively. Theoretical equivalency factors taking into account the effect of tire pressures were developed. A 25% increase in tire pressure could result in a 40 to 60% increase in equivalency for a dual tired single axle of 18 kips and a tandem axle of 34 kips.
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