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2nd International Conference on Advances in Materials and pavement Performance Prediction, AM3P 2020

作者： Habbouche, J. Hajj, E.Y. Sebaaly, P.E. Virginia Transportation Research Council CharlottesvilleVA United States Pavement Engineering and Science Program University of Nevada RenoNV United States

ISBN: (纸本)9780367461690

Reflective cracking is one of the major type of distresses associated with the use of asphalt concrete (AC) overlays for rehabilitating deteriorated asphalt pavements. This paper briefly describes the research effort completed to evaluate the reflective cracking performance life of high polymer-modified (HP)AC mixtures used as overlays. Sixteen AC mixtures were produced in the laboratory using conventional polymer modified (PMA)andHPasphalt *** mixtureswere evaluated in termsof their dynamic modulus and resistance to reflective *** engineering property and laboratory performance datawere combined into a mechanistic analysis that took into consideration the existingAC pavement condition, mix-specific material properties, traffic condition, and climate. Overall, the HP AC mixes resulted in an increase in both time to reach initial cracking and reflective cracking performance life of the AC overlay when compared to their respective PMA AC overlay mixes. © 2021 Taylor & Francis Group, London.

关键词： Binders

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Impact of high polymer modification on reflective cracking performance life of asphalt concrete overlays

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International Journal of pavement Research and Technology 2020年第5期13卷 510-523页

作者： Habbouche, Jhony Hajj, Elie Y. Piratheepan, Murugaiyah Sebaaly, Peter E. Research Scientist II Pavements Team Virginia Transportation Research Council 530 Edgemont Rd. CharlottesvilleVA22903 United States Pavement Engineering and Science Program Department of Civil & Environmental Engineering University of Nevada RenoNV89557 United States

Reflective cracking is one of the major type of distresses associated with the use of asphalt concrete (AC) overlays for rehabilitating deteriorated asphalt pavements. The differential movements across the underlying cracks due to the combined effects of heavy wheel loads and temperature fluctuations result in physical tearing of the AC overlay. Thus, the long-term performance of AC overlays highly depends on their ability to resist reflective cracking. While conventional polymer-modified (PMA) AC mixtures with 2–3% polymer content have shown improved long-term performance when used as overlays, it is also believed that AC mixtures with higher polymer content may offer additional advantages for flexible rehabilitated pavements subjected to heavy and/or slow-moving traffic loads. This paper describes the research effort completed to evaluate the reflective cracking performance life of high polymer-modified (HP) AC mixtures used as overlays. Sixteen AC mixtures were produced in the laboratory using PMA and HP asphalt binders. These mixtures were evaluated in terms of their dynamic modulus and resistance to reflective cracking. The engineering properties and laboratory performance data were combined into a mechanistic analysis that took into consideration the existing AC pavement condition, mixture-specific material properties, traffic condition, and climate. Overall, the HP AC mixtures resulted in an increase in both time to reach initial cracking and reflective cracking performance life of the AC overlay when compared to their respective PMA AC overlay mixtures. © 2020, Chinese Society of pavement engineering.

关键词： Mixtures

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Review of ice and snow runway pavements

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International Journal of pavement Research and Technology 2018年第3期11卷 311-320页

作者： White, Greg McCallum, Adrian Airport Pavement Research Program University of the Sunshine Coast Sippy Downs Queensland Australia Science and Engineering University of the Sunshine Coast Sippy Downs Queensland Australia

Antarctica is the highest, driest, coldest, windiest, most remote and most pristine place on Earth. Polar operations depend heavily on air transportation and support for personnel and equipment. It follows that improvement in snow and ice runway design, construction and maintenance will directly benefit polar exploration and research. Current technologies and design methods for snow and ice runways remain largely reliant on work performed in the 1950s and 1960s. This paper reviews the design and construction of polar runways using snow and ice as geomaterials. The inability to change existing snow and ice thickness or temperature creates a challenge for polar runway design and construction, as does the highly complex mechanical behaviour of snow, including the phenomena known as sintering. It is recommended that a modern approach be developed for ice and snow runway design, based on conventional rigid and flexible pavement design principles. This requires the development on an analytical model for the prediction of snow strength, based on snow age, temperature history and density. It is also recommended that the feasibility of constructing a snow runway at the South Pole be revisited, in light of contemporary snow sintering methods. Such a runway would represent a revolutionary advance for the logistical support of Antarctic research efforts. © 2017 Chinese Society of pavement engineering

关键词： Snow

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