Environmental impact assessment of recycled HMA with RAP materials from the rotary decomposition process compared to virgin HMA and conventional recycled HMA

Ai, Xinman; Pei, Zhongshi; Cao, Junyi; Zhu, Xun; Hu, Wei; Gao, Libo; Feng, Decheng; Yi, Junyan

doi:10.1016/j.jclepro.2023.136078

Cited by 10 publications

(2 citation statements)

References 29 publications

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“…Cost-effectiveness: Sustainable asphalt pavement practices can save money in the long term by reducing the need for expensive repairs and replacements over the pavement's lifespan. Using recycled materials in asphalt pavement, for example, minimizes the need for virgin materials, which can reduce production costs [16,18]. Beyond cost-effectiveness, it is critical to examine the larger benefits of employing recycled products.…”

Section: Future Studies and Research Nichementioning

confidence: 99%

A Comprehensive Overview of the Utilization of Recycled Waste Materials and Technologies in Asphalt Pavements: Towards Environmental and Sustainable Low-Carbon Roads

Yaro,

Sutanto,

Baloo

et al. 2023

Processes

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Given the prevailing concerns about greenhouse gas emissions, global warming, and the growing demand for renewable resources, the pavement industry, among others, is actively engaged in researching and exploring low-carbon materials and technologies. Despite the growing interest in low-carbon asphalt pavement, there is still a significant knowledge gap regarding the use of various waste materials and technologies to achieve this goal. This study aims to close this gap by conducting a systematic review and scientometric assessment of the existing studies on the use of waste materials and technologies for low-carbon asphalt pavement. The study spans the years 2008 to 2023, and the scientometric analysis was conducted using the VOS viewer application. The study identifies materials and technologies in this area by examining co-authored country studies, publication sources, and keyword co-occurrence. It should be noted that a limited number of waste materials that allow CO2 emissions reduction was analyzed in this study. However, other waste categories, such as bio-oils and polymers, which can provide positive either environmental or economic impacts on the production of paving materials, were not considered in the scope of the study. Based on the current review, it was found that integrating recycled waste materials like recycled asphalt pavement, biochar, or crumb rubber with alternative mixing technologies such as warm mix asphalt and cleaner energy can significantly reduce CO2 emissions. China and the United States were identified as key research contributors to the low-carbon pavement. Furthermore, biomass-based fuel and electric construction equipment lower carbon and greenhouse gas emissions by 36–90% and 67–95%, respectively. However, before various recycled waste materials and technologies can be widely used in the asphalt industry, various challenges need to be addressed, including cost concerns, performance and durability concerns, standardization and regulations, availability, integration with existing facilities, and insufficient field and long-term data. The review identified critical research gaps, such as the absence of a homogeneous and reliable standard method for low-carbon asphalt pavement, limited field performance data, and a life cycle assessment approach in analyzing the emission reduction effects. The reviews will aid in the paradigm shift to a more carbon-friendly pavement industry that uses recycled waste materials and technologies.

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Section: Future Studies and Research Nichementioning

confidence: 99%

A Comprehensive Overview of the Utilization of Recycled Waste Materials and Technologies in Asphalt Pavements: Towards Environmental and Sustainable Low-Carbon Roads

Yaro,

Sutanto,

Baloo

et al. 2023

Processes

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“…RAP has great recycling value because it contains non-renewable resources such as aged asphalt and aggregates. Its application in recycled asphalt mixture (especially hot-recycled asphalt mixture) has obvious economic and social benefits, and the performance of asphalt mixture is guaranteed [1][2][3][4]. Research has shown that when the RAP content in asphalt mixture is high, it can significantly reduce road construction costs by as much as approximately $94,000 per mile [5].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Factors Influencing the Modulus of Hot-Recycled Asphalt Mixture with High RAP

Chen¹,

Liu

Feng

et al. 2023

Materials

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Generally, the dynamic modulus and bending stiffness modulus are used to evaluate the mechanical properties of asphalt mixture, and they are also used as basic parameters for asphalt mixture design. Therefore, a study was conducted on changes in the dynamic modulus and bending stiffness modulus of hot-recycled asphalt mixture with high levels of reclaimed asphalt pavement (RAP) under the influence of different factors: dosage of regenerant, curing temperature, and curing time. The performance of reclaimed asphalt pavement (RAP) was first evaluated. Then, the hot-recycled asphalt mixture was adjusted and designed in order to conduct modulus experiments, composed of the dynamic modulus test and three-point bending test. Finally, the influencing factors were not only qualitatively but also quantitatively analyzed to clarify the change laws of the mechanical parameters of hot-recycled asphalt mixture. The results showed that the modulus of the recycled asphalt mixture first decreased, then increased, and then decreased with increasing dosage of regenerant. As the curing time or temperature increased, the modulus first decreased and then increased. In terms of the dynamic modulus of the hot-recycled asphalt mixture, the curing time had the greatest impact, followed by dosage of the regenerant and curing temperature. For bending stiffness modulus, the influence of dosage of the regenerant was the greatest, followed by curing time and curing temperature. For the bending stiffness modulus of hot-recycled asphalt mixture, the curing conditions had a greater influence compared with the dynamic modulus.

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Modulus of recycled hot mix asphalt: Micromechanical modeling and experimental approaches

Zhou,

Yi,

Wang

et al. 2024

Construction and Building Materials

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Environmental impact assessment of recycled HMA with RAP materials from the rotary decomposition process compared to virgin HMA and conventional recycled HMA

Cited by 10 publications

References 29 publications

A Comprehensive Overview of the Utilization of Recycled Waste Materials and Technologies in Asphalt Pavements: Towards Environmental and Sustainable Low-Carbon Roads

A Comprehensive Overview of the Utilization of Recycled Waste Materials and Technologies in Asphalt Pavements: Towards Environmental and Sustainable Low-Carbon Roads

Analysis of Factors Influencing the Modulus of Hot-Recycled Asphalt Mixture with High RAP

Modulus of recycled hot mix asphalt: Micromechanical modeling and experimental approaches

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