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XXVIIth World Road Congress
Pre-proceedings of the Congress

Topic 39. Reducing the carbon footprint of road pavements

  • IP0760 - A digital tool to support decision makings and to reduce the carbon footprint of road networks
    Koji NEGISHI

    Roads are a material-intensive system with an ever-increasing material demand as evidenced by 700,000 km of new roads built every year. Moreover, its particularly long service life of several decades implies maintenance needs with additional materials and energy consumption to secure vehicle safety and transport comfort. Meanwhile, climate actions and sustainable strategy in the infrastructure sector [...]

  • IP0747 - Assessment of the Performance Characteristics of SMA Surface Course Incorporating Reclaimed Asphalt – A Case Study in Ireland
    Brian MULRY

    The use of reclaimed asphalt pavement (RAP) materials in bituminous surface course mixtures provides significant environmental and economic benefits, and can contribute to promoting sustainability principles and the circular economy. Currently in Ireland, Transport Infrastructure Ireland (TII) permit the use of RAP up to 30% in base and binder course mixtures but do not permit the use of RAP in [...]

  • IP0248 - Can plastic roads be part of a sustainable transport future? The Australian perspective
    Filippo GIUSTOZZI

    Following the increased interest around the use of recycled and more sustainable materials to support the growth of the ever-expanding transport infrastructure industry in Australia, Austroads has coordinated a national research project on the use of recycled plastics in asphalt roads. There are approximately 3.2 million tonnes of waste plastics generated in Australia annually, of which a considerable [...]

  • IP0034 - Design of high performance wearing courses based on the use of "modified" RAP.
    Mario Roberto JAIR

    The interest in the reuse of RAP (Reclaimed Asphalt Pavement) in new high performance asphalt mixtures is growing: especially when such RAP comes from old surfaces based on the use of modified binders. Based on the background and experiences reported by the author in previous congresses, the purpose of the present work and continuing with what has been done, is to share the results of the first test [...]

  • IP0288 - Development of solar pavement in Japan and its contribution to carbon neutrality
    Tetsuri KAJI

    In road paving, solar pavement is being developed worldwide against the backdrop of the Paris Agreement, which set a long-term goal of mitigating climate change by 2050 and beyond, SDGs, carbon neutrality and other initiatives. In addition to providing traveling space, pavement, which covers a certain size of surface area in cities and regions, has the potential to generate new values to create renewable [...]

    Christine LEROY

    Infrastructure maintenance is an integral part of decarbonisation solutions. Optimised maintenance can reduce greenhouse gas (GHG) emissions, taking into account the whole life cycle of road infrastructure. The objective of this study is to quantify the effect of pavement maintenance on greenhouse gas emissions. The study is based on a comparison of the carbon footprint of optimised maintenance versus [...]

  • IP0470 - Environmental advantages of Perpetual Pavements (PPs) against traditional pavements: a Colombian case study
    Rodrigo POLO-MENDOZA

    Perpetual Pavements (PPs) are structural packages designed to maintain a service life of at least 50 years. Hence, PPs do not require major Maintenance and Rehabilitation (M&R) activities during this time. Thus, the PPs achieve higher profitability in the long term than traditional alternatives such as Conventional Flexible Pavements (CFPs) and Conventional Rigid Pavements (CRPs). In the literature, [...]

  • IP0485 - Environmental impacts of Warm Mix Rubberized Asphalt Concrete (WMRAC): A Life Cycle Assessment (LCA) approach to compare the dry and wet processes
    Rodrigo POLO-MENDOZA

    The Warm Mix Rubberized Asphalt Concrete (WMRAC) has drawn much attention due to its extraordinary mechanical performance over a wide temperature range and excellent resistance to adverse circumstances regarding traffic loads and weathering exposition. Nonetheless, the environmental efficiency assessment of these mixtures has been neglected in the literature. In this way, many investigations assume [...]

  • IP0613 - Evaluation of road sections using an extremely thick base layer by cold recycling in place after first years of exploitation
    Zsolt BOROS

    The reusing material of the existing deteriorated pavement for producing the layers with better quality leads to significant reduction of the carbon footprint of road pavements and saving of the nature. The obvious intention is to do this to the highest degree. The paper documented the successful reconstruction of old cement concrete pavement by implementation of the hydraulically bound base layer [...]

  • IP0761 - Evaluation of the carbon footprint of super-modified bituminous road pavement in a Smart-Road project.
    Lorenzo NICOLINI

    The aim of ASTM is to be a protagonist in ecological mobility by promoting technological and ecological transition through innovations implemented on its motorway assets, with the goal to make such infrastructures safer, smarter and more sustainable. ASTM’s concessionaire company, SATAP, has presented an economic financial plan for the period 2023-2026 (“EFP 2023-26”) aimed at transforming the [...]

  • IP0389 - Experience with reducing the carbon footprint of asphalt mixtures with higher amounts of reclaimed asphalt.
    Zdeněk HEGR

    One of the most important issues of today is undoubtedly the reduction of the carbon footprint of the construction products that are commonly available on the market. As in other industries, alternative production methods are constantly being sought in road construction to contribute to the overall reduction of CO2 emissions. This paper is focused on an up-to-date experience in reducing the carbon [...]

  • IP0217 - Experiences from 4 years of monitoring "Climate Friendly Asphalt"
    Jakob LARSEN

    The Danish Road Directorate (DRD) has over the past 10 years worked on developing and implementing a strategy to lower the energy consumption of vehicles by optimizing the pavement surface characteristics. For this purpose, a special type of Stone Mastic Asphalt (SMA), also referred to as “Climate Friendly Asphalt” (KVS), was developed focusing on the listed targets: i) reducing rolling resistance, [...]

  • IP0391 - Feasibility of full recycling of RAP with waste cooking oil as a rejuvenator in hot- and warm-mix asphalt concrete
    Silvino CAPITÃO

    This paper presents the studies carried out so far within the scope of an ongoing project funded by the European Union and the Portugal 2020 program, with the title CoolAsphalt. The project aims to develop asphalt mixture products based on fully recycling RAP and waste cooking oil as a rejuvenator for low to medium-traffic roads. In Portugal, those types of roads are about 75.000 km. Over the last [...]

  • IP0409 - Generation and Evaluation of Tire and Road Wear Particles Using Simple Laboratory Tests: Effect of the Nominal Maximum Aggregate Size of SMA Mixtures
    Jong-Sub LEE

    A simple laboratory tire- and road-wear particle (TRWP)-generation system was developed to generate and quantify the amount of TRWP. In a closed environmental chamber, a single cylindrical road-pavement specimen was installed at the center of a steel plate and rotated at 80 km/h, while applying three tires loads located at 0°, 120°, and 240° around the cylindrical specimen. And, a particulate matter [...]

  • IP0221 - Holistic sustainability analysis of existing and new pavement constructions

    Sustainability is becoming a “buzzword” in the construction sector. A comprehensive search for sustainable solutions has already begun. Quite often, only some aspects are included in the assessment of sustainability. Contrary, from a holistic point of view the whole life cycle of any solution must be analysed, considering all dimensions of sustainability, which include ecology, economy, and social [...]

  • IP0269 - Laboratory comparison between ordinary and alternative inorganic binders for stabilizing construction and demolition waste aggregates
    Luca TEFA

    In the road pavement, the subbase layer plays a key role in supporting the upper layers and transferring traffic loads to the subgrade. The subbase is usually made up of selected and compacted unbound natural granular aggregate. However, in more trafficked roadways, cement-stabilized materials are traditionally employed to enhance mechanical properties, especially when recycled aggregates from construction [...]

  • IP0202 - Mechanical, Environmental and Economic assessments of HMA and WMA with RCA contents: A threshold-based approach to raising sustainability
    Rodrigo POLO-MENDOZA

    The Warm Mix Asphalt (WMA) is an alternative to traditional Hot Mix Asphalt (HMA). Regarding the HMAs, the WMAs require less temperature (between 20-40 °C) for their production. In this way, the energy savings induced by the WMAs enable a reduction in environmental impacts and the monetary investment associated with asphalt concrete production. Hence, the WMAs have been recognized in the road infrastructure [...]

  • IP0706 - National Specification Proposal for Use of Steel Slag in HMA
    Fatih YONAR

    The construction industry is one of the world's largest consumers of raw materials. It is also recognized as the locomotive sector in Turkiye. However, the harsh consuming process of the construction sector makes sustainability an obligation for developed countries. In this regard, as the world's eighth largest steel producer, use of steel slag as artificial aggregate in highway construction is started [...]

    Francisco José VEA FOLCH

    The interest in reducing the manufacturing temperature of hot bituminous mixtures has its origins in two different events with different objectives: on the one hand, the discussions on environmental protection measures in the United Nations since 1992 and, on the other hand, the establishment and revision of limits for exposure to high temperature bitumen emissions for the protection of personnel [...]

    White GREG

    With an increased focus on sustainable pavement construction, recycling of various waste materials into asphalt mixtures is becoming more common. Materials currently being recycled in this way include recycled asphalt millings, crumbed tyre rubber, crushed glass and various waste plastics. In terms of waste plastics in asphalt mixtures, some plastics are intended to pre-coat the aggregate particles, [...]

  • IP0218 - Reducing CO2 for road projects
    Jon Kjær JØRGENSEN

    There is an urgent need to reduce CO2-emissions; not only to meet national, EU or similar targets of reduction, but to mitigate climate change altogether. In this context, the transportation sector can and must contribute with initiatives to reduce CO2. For this contribution, there is a need to deliver specific values for current CO2-emssions of all phases related to infrastructure projects and [...]

  • IP0530 - Solar thermal collectors: the road to new solutions - feedback
    Bertrand POUTEAU

    Recent developments in the geopolitical, climatic and societal contexts are contributing to tension in the energy markets. Faced with these tensions, energy sobriety and the search for alternative energy resources are at the heart of the concerns of households, companies and institutions. Faced with this demand, supply is sometimes difficult to analyze: the lack of information on the availability [...]

  • IP0373 - The Application of Pavement Materials Used only Recycled Materials

    In Japan, concrete waste is primarily recycled as granular subbase course material but is not sufficiently processed. As a result, new technologies that can be effectively used in processing waste concrete must be developed. Conversely, due to financial and management constraints, Japan’s declining birthrate, aging population, and a massive stock of pavements have created a need to extend pavement [...]

  • IP0108 - The Easing Sydney Congestion’s Program office. An example of pavement sustainable practices
    Solis-Navarro CARLOS

    Since 2016, the Easing Sydney’s Congestion Program Office (ESCPO) within Transport for NSW has been implementing various technologies and methodologies to deliver an extensive program of urban arterial road upgrade projects in a sustainable and efficient way. While the main ESCPO goals have focused on improving traffic flows and trip reliability and safety, the opportunity to use ESCPO as a platform [...]

  • IP0254 - Use of Plastic Wastes as Substitute of Aggregates in Concrete Mixes

    Concrete is currently one of the most widely used materials in the construction of pavements and additional works. However, the continuous growth in the demand for this material generates ecological havoc since the raw materials are exploited in an uncontrolled and sometimes unregulated manner, which causes negative impacts on the environment. On the other hand, plastics have become an essential part [...]

  • IP0344 - Warm Mix Asphalt Containing very High-Content Reclaimed Asphalt Pavement Utilizing Both Asphalt Forming Technology and Special Additives

    Abstract This paper presents the newly developed warm mix asphalt (WMA) containing very high-content reclaimed asphalt pavement (RAP) utilizing both asphalt forming technology (AFT) and special additives. Asphalt is the most recycled material at a re-use rate of 99% and very high-content RAP of 60% or more is used in a given asphalt mix design in Japan. In recent, several advantages of WMA utilizing [...]