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As the price of liquid asphalt continuously climbs, methods are being sought to decrease material costs, which will also have less impact on ecological systems without compromising material or pavement performance. The use of recycled materials is one method that can replace a percentage of their virgin counterparts, thus reducing the negative impacts on the environment. Asphalt mixture performance is affected by the level of blending that occurs between aged and virgin asphalt binders. The interaction and compatibility of recycling agents (RAs) with recycled asphalt shingles (RAS) and reclaimed asphalt pavements (RAP) have not been thoroughly evaluated since the 1970s. To characterize laboratory mixture performance through their mechanistic and volumetric properties, a suite of tests was conducted to evaluate the low, intermediate, and high temperature performance of conventional asphalt mixtures and mixtures containing RAS and/or RAP with and without RAs. Also, the asphalt binders’ molecular structure was correlated with their cracking potential through binder fractionation. With respect to the mixes without RAs, results indicate that RAS binder does not fully blend with the virgin binder. The actual availability factor was found to range from 35 to 46%. Also shown was an improvement in rutting performance, with no adverse effects to intermediate temperature or low temperature performance because the mixtures are comprised of approximately 90% virgin asphalt. For mixtures containing RAs, a modified mixture design change was developed to improve blending between the aged and virgin asphalt binders. The actual availability factor was found to range from 50 to 100%. It was determined that RAs adversely affected the intermediate and low temperature properties of the mixtures studied due to the increase in the recycled binder content utilized within the mixture. In terms of low temperature properties, the use of soft binder performed similar to mixtures containing no RAs. The concentration of the high molecular RAS species exceeds 40% in which 25% of these are highly aggregated with apparent molecular weights approaching 100K. The use of RAs did not significantly dissociate the very high molecular weight species, and thus failed to improve mixture cracking resistance. In addition, Fourier-Transform Infrared Spectroscopy (FTIR) results were inconclusive.
This book presents the meaning of green infrastructure and its concerns to the contribution of materials and applications. It explores the evolving contested material under “green infrastructure” covering timber, concrete, soil, and pavement. It discusses the resistance to the ambiguity of managing the construction of green infrastructure and drawing on wider debates around applications and processes on construction. These contributions are by no means definitive, but rather an attempt to provide a detached and holistic perspective on the engineering “green infrastructure” concept.
[Italiano]: La SIIV Arena è uno spazio di confronto nel quale dottorandi e giovani studiosi delle diverse sedi accademiche illustrano le loro ricerche su temi di specifico interesse per il Settore Scientifico Disciplinare ICAR/04 “Strade, Ferrovie e Aeroporti”. Questo volume raccoglie gli atti della 7a SIIV Arena, tenutasi a Napoli il 9 settembre 2022, e svoltasi nell’ambito della XVIII International SIIV Summer School: “Sustainable Pavements and Road Materials”. Il ricorso a tecnologie di costruzione e manutenzione basate su principi di sostenibilità, resilienza ed economia circolare, sono di riferimento, in sinergia con l’utilizzo di materie prime seconde, per il raggiungimento di adeguate performance meccaniche per il corpo stradale, a ridotto impatto ambientale e costi. Il gradiente di crescita registrato nell’ambito delle infrastrutture civili ha definito un incessante ricorso all’utilizzo di risorse naturali con conseguenti effetti negativi in termini di sostenibilità ambientale. Il reimpiego di rifiuti nei processi di mix design e il ricorso all’uso di sistemi di lavorazione in situ e/o tecnologie a “bassa energia” (i.e. conglomerati bituminosi a freddo e/o tiepidi) accolgono in pieno gli obiettivi alla base dei principi dell’economia circolare. Tale volume si propone di raccogliere le ricerche più innovative nel settore presentate nell’ambito della 7a SIIV Arena analizzando aspetti relativi alla progettazione, costruzione e manutenzione nel suo complesso delle pavimentazioni e corpo stradale./[English]: The SIIV Arena is a space for discussion in which PhD students and young scholars from various universities illustrate their research on topics of specific interest for the Scientific Disciplinary Sector ICAR/04 “Roads, Railways and Airports”. This volume collects the proceedings of the 7th SIIV Arena, held in Naples on 9 September 2022, and held as part of the XVIII International SIIV Summer School: "Sustainable Pavements and Road Materials". The use of construction and maintenance technologies based on principles of sustainability, resilience and circular economy, are a reference, in synergy with the use of secondary raw materials, for achieving adequate mechanical performance for the road structure, with a reduced environmental impact. and costs. The growth gradient recorded in the field of civil infrastructures has defined an incessant use of natural resources with consequent negative effects in terms of environmental sustainability. The reuse of waste in mix design processes and the use of in situ processing systems and/or "low energy" technologies (i.e., cold and/or warm asphalt mixtures) fully meet the objectives underlying the principles of the circular economy. This volume aims to collect the most innovative research in the sector presented in the context of the 7th SIIV Arena by analyzing aspects relating to the design, construction and maintenance of the pavement and road infrastructure as a whole.
Climate change, energy production and consumption, and the need to improve the sustainability of all aspects of human activity are key inter-related issues for which solutions must be found and implemented quickly and efficiently. To be successfully implemented, solutions must recognize the rapidly changing socio-techno-political environment and multi-dimensional constraints presented by today’s interconnected world. As part of this global effort, considerations of climate change impacts, energy demands, and incorporation of sustainability concepts have increasing importance in the design, construction, and maintenance of highway and airport pavement systems. To prepare the human capacity to develop and implement these solutions, many educators, policy-makers and practitioners have stressed the paramount importance of formally incorporating sustainability concepts in the civil engineering curriculum to educate and train future civil engineers well-equipped to address our current and future sustainability challenges. This book will prove a valuable resource in the hands of researchers, educators and future engineering leaders, most of whom will be working in multidisciplinary environments to address a host of next-generation sustainable transportation infrastructure challenges. "This book proposes a broad detailed overview of the actual scientific knowledge about pavements linked to climate change, energy and sustainability at the international level in an original multidimensional/multi-effects way. By the end, the reader will be aware of the whole global issues to care about for various pavement technical features around the world, among which the implications of modelling including data collection, challenging resources saving and infrastructures services optimisation. This is a complete and varied work, rare in the domain." Dr. Agnes Jullien Research Director Director of Environmental, Development, Safety and Eco-Design Laboratory (EASE) Department of Development, Mobility and Environment Ifsttar Centre de Nantes Cedex- France “An excellent compilation of latest developments in the field of sustainable pavements. The chapter topics have been carefully chosen and are very well-organized with the intention of equipping the reader with the state-of-the-art knowledge on all aspects of pavement sustainability. Topics covered include pavement Life Cycle Analysis (LCA), pervious pavements, cool pavements, photocatalytic pavements, energy harvesting pavements, etc. which will all be of significant interest to students, researchers, and practitioners of pavement engineering. This book will no doubt serve as an excellent reference on the topic of sustainable pavements.” Dr. Wei-Hsing Huang Editor-in-Chief of International Journal of Pavement Research and Technology (IJPRT) and Professor of Civil Engineering National Central University Taiwan
This volume includes a unique group of chapters focusing on new advances in materials for infrastructure sustainability. Chapters have been well-organized and handled by a group of international experts in order to discuss a timely topic with regards to the sustainable infrastructures. This volume is part of the proceedings of the 1st GeoMEast International Congress and Exhibition on Sustainable Civil Infrastructures, Egypt 2017.
Worldwide there is a growing interest in efficient planning and the design, construction and maintenance of transportation facilities and infrastructure assets. The 3rd International Conference on Transportation Infrastructure ICTI 2014 (Pisa, April 22-25, 2014) contains contributions on sustainable development and preservation of transportation infrastructure assets, with a focus on eco-efficient and cost-effective measures. Sustainability, Eco-efficiency and Conservation in Transportation Infrastructure Asset Management includes a selection of peer reviewed papers on a wide variety of topics: • Advanced modeling tools (LCA, LCC, BCA, performance prediction,design tools and systems) • Data management (monitoring and evaluation) • Emerging technologies and equipments • Innovative strategies and practices • Environmental sustainability issues • Eco-friendly design and materials • Re-use or recycling of resources • Pavements, tracks, and structures • Case studies Sustainability, Eco-efficiency and Conservation in Transportation Infrastructure Asset Management will be particularly of interest to academics, researchers, and practitioners involved in sustainable development and maintenance of transportation infrastructure assets.
This book includes a collection of research and practical papers from international research and technology activities on recent developments in infrastructure engineering. Sustainability is increasingly a key priority in engineering practices. With the aging transportation infrastructure and renewed emphasis on infrastructure renovation by transportation agencies, innovations are urgently needed to develop materials, designs, and practices to ensure the sustainability of transportation infrastructure.
This Special Issue “Sustainable Designed Pavement Materials” has been proposed and organized as a means to present recent developments in the field of environmentally-friendly designed pavement materials. For this reason, articles included in this special issue relate to different aspects of pavement materials, from industry solid waste recycling to pavement materials recycling, from pavement materials modification to asphalt performance characterization, from pavement defect detection to pavement maintenance, and from asphalt pavement to cement concrete pavement.
The edited book comprises invited book chapter contributions from global experts in the field of sustainable materials and resilient infrastructure. The book covers the most critical and emerging topics for creating sustainable solutions for the construction industry, promoting the technologies and monitoring methods for resilient infrastructure. It focuses on sustainable solutions and offers techniques and methodologies to deliver high-quality end solutions in civil engineering. In addition, the content provides knowledge-based information for the readers to assess, monitor, measure, and practice sustainability for resilient infrastructure. The contents of the volume are a blend of academic research work and industrial case studies. It covers the use of sustainable materials like Lime-Pozzolona Binders, biopolymers, lignosulphonate, lightweight aggregates made from fly ash, calcinated clay, paper ash, and limestone as amendments/ameliorators for soil remediation, development of neo-construction materials and composites for civil engineering applications. Design of innovative pavements using alkali activation and pervious concrete for sustainable infrastructure is also discussed. The chapters also highlight the role of civil engineers in achieving UN Sustainable Development Goals, promoting climate change design for urban landscapes, and modelling building energy demand. This book is framed to address the principles and practice from the corners of geoenvironment, sustainable construction materials, low carbon materials, energy efficiency, and waste management. It is a valuable reference for faculty, researchers, field experts, scientists, and practicing engineers.