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Bayesian economic analyses of including reclaimed asphalt pavements in flexible pavement rehabilitation
Published in John Harvey, Imad L. Al-Qadi, Hasan Ozer, Gerardo Flintsch, Pavement, Roadway, and Bridge Life Cycle Assessment 2020, 2020
Hongren Gong, Miaomiao Zhang, Wei Hu, Baoshan Huang*
Recycling used asphalt pavement materials into new or rehabilitative pavement construction activities have been gaining ever-growing efforts for both of its economic and environmental benefits. Enormous laboratory studies have been performed to investigate the short-term and long-term performance of adding reclaimed asphalt pavement (RAP) into new materials, developing new mixture design methods in considering the impacts of the aged binder in the RAP on the resulting mixtures, examine the blending and mixing status of the aged and virgin binder using both macro and micro techniques (Gong et al., 2018; Huang et al., 2005; Shu et al., 2012). Extensive studies have been focusing on evaluating the field performance of the asphalt mixtures containing RAP along with other techniques in promoting more environmental advantages (Aurangzeb & Al-Qadi, 2014; Shu et al., 2012).
Summary
Published in J. Cliff Nicholls, Asphalt Mixture Specification and Testing, 2017
Asphalt is a remarkable and useful material for the construction of highway, airfield and other pavements. The myriad of properties that can be provided is wide ranging with the extent that each aspect is required depending on the location and geometry of the site, the traffic expected on the pavement, the layer within the pavement and the design concept for the pavement. The particular design procedure consideration that is relevant is whether it is for conventional dense pavement or for a pervious pavement in a sustainable drainage system (SUDS).
Opportunities and challenges for the application of asphalt supporting layer in the slab track system
Published in Xianhua Chen, Jun Yang, Markus Oeser, Haopeng Wang, Functional Pavements, 2020
Asphalt mixture is the most commonly used pavement material due to its excellent workability, stability, and driving comfort. The asphalt pavement technology has been thoroughly studied and well documented(Motevalizadeh et al., 2018). However, the working environment of ASL in the slab track system, including loading environment and temperature conditions, is different from that of asphalt pavement(Liu et al., 2019, Liu et al., 2020). Thus, both the material and structure of ASL need to fulfill the requirements of the slab track.
Physico-chemical and mechanical properties of asphalt binders blended with waste bio-shell powder
Published in International Journal of Pavement Engineering, 2023
Yuchen Guo, Guanyu Ji, Xuancang Wang, Beisi Tian, Yi Zhang
Asphalt is an excellent viscoelastic material and an important raw material in highway engineering, it is widely used in pavement construction worldwide (Behera et al. 2021). However, the production process consumes large amounts of energy such as coal, electricity and gasoline and produces large amounts of greenhouse gases such as methane and carbon dioxide (Ma et al. 2021, Ma et al. 2022). The European Asphalt Association publishes information on the production cycle of asphalt, which shows that the production of 1 tonne of asphalt releases 182.12 kg of greenhouse gases such as carbon dioxide (Eurobitumen 2020). And asphalt is a non-renewable resource, and excessive consumption will cause many environmental problems (Zahoor et al. 2021). Road industry researchers adhere to concepts of energy saving, environmental protection, and renewable and sustainable development, actively seeking new materials that can replace asphalt bonding materials to ensure sustainable road project development (Dong et al. 2020, Nizamuddin et al. 2022). Therefore, developing renewable asphalt modifiers with good cost-effectiveness is urgently required.
Bond Strength in Dry Condition of Reclaimed Asphalt Modified by Crumb Rubber Modified Binder
Published in The Journal of Adhesion, 2023
Ahmed S. Mohamed, Feipeng Xiao, Chamod Hettiarachchi, Talaat Abdel-Wahed
In response to the sustainability commitment, many researchers recently are directed to developing innovative asphalt technologies which reduce resource depletion, life cycle cost, and gas emissions. Also, many studies conferred economic and environmental objectives for construction and rehabilitation planning during the whole life cycle of the asphalt pavement.[1–3] Many studies found that utilizing reclaimed asphalt pavement (RAP) in asphalt mixture reduces not only the resources consumption but also the economic and environmental burdens of the pavement life cycle.[4–6] Crumb rubber produced from the scrap tires of vehicles, a waste material that can severely harm the environment if discarded in an open area, was also widely adopted as an asphalt binder modifier.[7] In many countries, field applications of rubber asphalt mixtures demonstrated higher durability and performance than conventional asphalt mixtures.[8] Despite the higher cost and energy consumption for manufacturing rubber-modified binders, some studies also assured a great potential for this technology to reduce the total cost, energy consumption, and gas emission of pavement life cycle due to its higher durability and lower need for maintenance.[9] Thus, rubber and RAP modifications aroused a substantial interest in recent studies and experimental investigations.[7,8]
Evaluating interaction of fibre reinforcement mechanism with mesostructure of asphalt concrete
Published in International Journal of Pavement Engineering, 2022
Hossein Noorvand, Samuel Castro, Benjamin S. Underwood, Kamil E. Kaloush
Roadway pavements are an essential constituent of the transportation infrastructure. Pavements built with asphalt concrete make up roughly 90% of the paved roads in the U.S.A. and over 99% of paved roads globally (USDOT 2010). Asphalt concrete is the popular paving material thanks to its lower initial cost compared with other alternatives, availability, ease of constructability, and ability to be used at both low-volume and high-volume traffic conditions. Still, these roadways are under ever growing demands to carry heavier traffic loads. With weathering and continued usage, asphalt pavements endure deterioration and need several maintenance activities during their designed service life. Therefore, scientists and engineers are constantly trying to improve the performance of asphalt mixtures and pavements including new road design, construction, maintenance, and management technologies, innovative materials, and techniques (Underwood 2011). Production of better-performing asphalts may not always be feasible through refining and processing improvements. Hence, modification of the asphalt concrete by incorporating new additives either in the bitumen or in the asphalt mixture is one of the common strategies to enhance the service lifetime of asphalt pavements. To this end, there are different types of modifiers, including various resins, rubbers, polymers, sulphur, metal complexes, fibres, and chemical agents (Park 2012).