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Jo E. Sias

Bio: Jo E. Sias is an academic researcher from University of New Hampshire. The author has contributed to research in topics: Asphalt & Cracking. The author has an hindex of 6, co-authored 31 publications receiving 114 citations.

Papers
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Journal ArticleDOI
TL;DR: Aging can significantly affect the viscoelastic properties and cracking behavior of asphalt mixtures, causing increase in stiffness, reduction in relaxation capability, and increase in brittleness.
Abstract: Aging can significantly affect the viscoelastic properties and cracking behavior of asphalt mixtures, causing increase in stiffness, reduction in relaxation capability, and increase in brittleness....

31 citations

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TL;DR: In this paper, the authors show that pavements are vulnerable to reduced life with climate-change-induced temperature rise and that greenhouse gas emissions have caused an increase in global temperatures since the mid-20th century and the war in Korea.
Abstract: Pavements are vulnerable to reduced life with climate-change-induced temperature rise. Greenhouse gas emissions have caused an increase in global temperatures since the mid-20th century and the war...

28 citations

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TL;DR: In this article, the semi-circular bending (SCB) test has gained popularity for evaluating cracking performance of asphalt mixtures and an Illinois Flexibility Index Test (I-FIT) variant of SCB has shown the ab...
Abstract: Use of the semi-circular bending (SCB) test has gained popularity for evaluating cracking performance of asphalt mixtures. An Illinois Flexibility Index Test (I-FIT) variant of SCB has shown the ab...

21 citations

Journal ArticleDOI
TL;DR: In this paper, the effect of different aging conditions on linear viscoelastic mixture properties, as well as the cracking and aging susceptibility of asphalt mixtures, were evaluated using different laboratory conditioning protocols to simulate a range of aging levels.
Abstract: Aging can significantly affect the performance of asphalt mixtures, causing increase in stiffness, reduction in relaxation capability and increase in cracking susceptibility. It is also well known that fundamental viscoelastic properties are used for design and modelling of asphalt mixtures and pavement structures to addressing rutting, fatigue and thermal cracking concerns. The objective of this paper is to study how the viscoelastic properties of asphalt mixture change over time, and evaluate and identify the cracking and aging susceptibility of asphalt mixtures with different mix variables during material selection and mixture design. Ten mixtures are evaluated using different laboratory conditioning protocols to simulate a range of aging levels in the field. The complex modulus test is then conducted on the lab aged mixtures to measure the viscoelastic properties in order to construct the dynamic modulus and phase angle master curves. The mixture Glover-Rowe (G-Rm) parameter and the shape parameters of the dynamic modulus and phase angle master curves, including inflection point frequency (−β/γ), difference between the glassy modulus and the inflection point modulus (γ), peak value of phase angle (a) and the horizontal position (frequency) of the peak phase angle value (c), are determined and evaluated for the mixtures with different aging conditions and mix variables. The study indicates the ability of the G-Rm parameter and all the master curve shape parameters to capture the effect of different aging conditions on linear viscoelastic mixture properties, as well as the cracking and aging susceptibility of asphalt mixtures.

19 citations

Journal ArticleDOI
TL;DR: In this article, a hybrid approach to pavement adaptation with climate-change-induced temperature and groundwater rise is demonstrated at a case-study site in coastal New Hampshire, where a stepwise and flexible adaptation plan is developed that includes HMA overlays with prescribed thickness and application timing, base-layer rehabilitation options, and re-evaluation opportunities.
Abstract: Greenhouse gas emissions have caused global temperatures to rise since the mid-20th century accompanied by sea-level rise (SLR). Temperature increases and SLR-induced groundwater rise have been shown to cause premature pavement failure in many roadway structures. Hybrid bottom-up/top-down (hybrid) adaptation approaches have shown promise by initially investigating an asset’s response to incremental environmental change and then identifying the timing of critical effects for budgetary planning. This improves practitioners’ understanding of the asset’s climate resiliency and informs adaptation-plan development to minimize both cost and risk. In this study, a hybrid approach to pavement adaptation with climate-change-induced temperature and groundwater rise is demonstrated at a case-study site in coastal New Hampshire. The hot-mix-asphalt (HMA) thickness that achieves a minimum of 85% reliability is calculated for 70 combinations of incremental temperature and groundwater rise. Increasing the base-layer thickness improves resiliency against rising temperatures, but rising groundwater diminishes this improvement demonstrating that both HMA and base-layer thickness increases are needed. Thirteen adaptation pathways are evaluated for pavement performance, life-cycle costs, and road-surface inundation over a 60-year pavement management period. A stepwise and flexible adaptation plan is developed that includes HMA overlays with prescribed thickness and application timing, base-layer rehabilitation options, and re-evaluation opportunities.

17 citations


Cited by
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Journal ArticleDOI
02 Dec 1999-Nature
TL;DR: In this paper, it was argued that by the end of the next century the world will be a flood-and storm-prone hothouse, and the suggestion by a British member of parliament in the nineteenth century that London would be waste-high in horse excrement by the 1950s could have been seen as a call for crippling taxes on Hansom cabs, pushing cabbies out of trade while still leaving us choking on exhaust fumes.
Abstract: Legislating for the present on the basis of predictions for the future can never be other than a dicey business. The suggestion by a British member of parliament in the nineteenth century that London would be waste-high in horse excrement by the 1950s could have been seen as a call for crippling taxes on Hansom cabs, pushing cabbies out of trade while still leaving us choking on exhaust fumes. So should we now be legislating against those exhaust fumes, in fear that by the end of the next century the world will be a flood- and storm-prone hothouse?

255 citations

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TL;DR: In this article, the authors summarized current knowledge related to the use of recycling agents in the asphalt pavement industry, including properties of recycled and rejuvenated asphalt mixtures, and identified current and future challenges that could prevent utilization of recycling agent and production of rejuvenated mixtures with adequate performance.

103 citations

Journal ArticleDOI
TL;DR: In this article, an extensive literature search on qualitative and quantitative pavement research related to climate change in recent years is presented. The topics cover climate stressors, sensitivity of pavement performance to climatic factors, impacts of climate change on pavement systems, and, most importantly, discussions of climate climate change adaptation, mitigation, and their interactions.
Abstract: Flexible pavements and climate are interactive. Pavements are climate sensitive infrastructure, where climate can impact their deterioration rate, subsequent maintenance, and life-cycle costs. Meanwhile, climate mitigation measures are urgently needed to reduce the environmental impacts of pavements and related transportation on the macroclimate and microclimate. Current pavement design and life cycle management practices may need to be modified to adapt to changing climates and to reduce environmental impacts. This paper reports an extensive literature search on qualitative and quantitative pavement research related to climate change in recent years. The topics cover climate stressors, sensitivity of pavement performance to climatic factors, impacts of climate change on pavement systems, and, most importantly, discussions of climate change adaptation, mitigation, and their interactions. This paper is useful for those who aim to understand or research the climate resilience of flexible pavements.

44 citations

Journal ArticleDOI
TL;DR: In this paper, a review paper on the topic of "New innovations in pavement materials and engineering: A review on pavement engineering research 2021" has been published, which analyzes the research status and future development direction of 5 major fields of pavement engineering.
Abstract: Sustainable and resilient pavement infrastructure is critical for current economic and environmental challenges. In the past 10 years, the pavement infrastructure strongly supports the rapid development of the global social economy. New theories, new methods, new technologies and new materials related to pavement engineering are emerging. Deterioration of pavement infrastructure is a typical multi-physics problem. Because of actual coupled behaviors of traffic and environmental conditions, predictions of pavement service life become more and more complicated and require a deep knowledge of pavement material analysis. In order to summarize the current and determine the future research of pavement engineering, Journal of Traffic and Transportation Engineering (English Edition) has launched a review paper on the topic of “New innovations in pavement materials and engineering: A review on pavement engineering research 2021”. Based on the joint-effort of 43 scholars from 24 well-known universities in highway engineering, this review paper systematically analyzes the research status and future development direction of 5 major fields of pavement engineering in the world. The content includes asphalt binder performance and modeling, mixture performance and modeling of pavement materials, multi-scale mechanics, green and sustainable pavement, and intelligent pavement. Overall, this review paper is able to provide references and insights for researchers and engineers in the field of pavement engineering.

42 citations