Article
Chemistry, Physical
Anda Ligia Belc, Erdem Coleri, Florin Belc, Ciprian Costescu
Summary: The study shows that using warm mix additives can reduce the mixing and compaction temperatures of asphalt concrete by 40 degrees Celsius without compromising long-term performance, thus reducing fuel consumption and greenhouse gas emissions.
Article
Construction & Building Technology
Mahmoud Ameri, Sepehr V. Abdipour, Arash Rahimi Yengejeh, Masoud Shahsavari, Afshar A. Yousefi
Summary: Using recycled Crumb Rubber (CR) and zeolite as modifiers can improve the mechanical properties and durability of asphalt mixtures, although it may increase the viscosity of the binder. Zeolite as an additive in Warm Mix Asphalt (WMA) can enhance the performance of Rubberized-Asphalt (RA) mixtures and reduce production costs.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Weiying Wang, Huailei Cheng, Lijun Sun, Yiren Sun, Ning Liu
Summary: This research evaluates the various performances of recycled warm-mix asphalt (RWMA), finding that increasing reclaimed asphalt pavement (RAP) content reduces moisture damage resistance and low-temperature performance, but this can be compensated by using warm-mix additive (WMA). By contrast, rutting resistance and fatigue performance improve with an appropriate combination of WMA additive and RAP content. Statistical analyses reveal that RAP content has the greatest impact on RWMA performance, while WMA additive type predominantly influences moisture susceptibility. The findings provide references for regulating RWMA performances by adjusting design components.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Construction & Building Technology
Shuai Yu, Shihui Shen, Richard Steger, Xue Wang
Summary: Warm mix asphalt (WMA) technologies have gained popularity for their improved workability, reduced energy consumption, and improved sustainability. However, selecting the right WMA technology and determining its effectiveness is still a question. This paper analyzes the particle's kinematic behavior during compaction using a MEMS sensor and proposes measures to evaluate the workability of asphalt mixtures. The study finds that particle rotation is crucial for compaction and can be used to assess the workability. The results show that higher production temperature and dosage rate of chemical additives improve particle rotation and workability.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Jie Gong, Ya Liu, Yongjia Jiang, Qingjun Wang, Zhonghua Xi, Jun Cai, Hongfeng Xie
Summary: Sasobit has been widely used as a WMA additive in environmentally friendly pavement construction. When incorporated into WEAB, Sasobit improves viscosity, extends operational lifetime, and enhances tensile strength. However, it may slightly reduce damping properties and thermal stability.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2021)
Article
Green & Sustainable Science & Technology
Jianying Hu, Tao Ma, Teng Yin, Yang Zhou
Summary: To address global concerns, warm mix asphalt and crumb rubber modified asphalt have been proposed as green technologies for environmentally-friendly pavement. However, limited research has been done on foamed warm mix asphalt with crumb rubber (FWMA-CR). This study investigates the foaming condition of FWMA-CR binder and evaluates the performance of both the binder and mixture, providing guidance for the production and usage of FWMA-CR.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Construction & Building Technology
Zulfiqar Ali Jattak, Norhidayah Abdul Hassan, Mohd Khairul Idham Mohd Satar
Summary: Warm Mix Asphalt (WMA) is considered a sustainable pavement construction technology with economic and environmental benefits. However, concerns remain regarding its performance properties, such as moisture susceptibility. Using waste and by-products in WMA mixtures can enhance performance, while the inclusion of Bottom Ash (BA) can improve moisture susceptibility and environmental properties.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2021)
Article
Construction & Building Technology
Pinhui Zhao, Ruibo Ren, Hao Zhou, Jian Ouyang, Zhigang Li, DaChuan Sun
Summary: Adding IMDL can significantly reduce the mixing temperature of asphalt mixtures, decrease asphalt fume emissions, and achieve significant energy savings. Additionally, IMDL can improve the high-temperature performance of asphalt mixtures at a lower cost compared to commonly used WMA additives.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Bruno C. Amoni, Armando D. L. Freitas, Raquel A. Bessa, Cristiane P. Oliveira, Moises Bastos-Neto, Diana C. S. Azevedo, Sebastiao M. P. Lucena, Jose M. Sasaki, Jorge B. Soares, Sandra A. Soares, Adonay R. Loiola
Summary: An experimental investigation on the synthesis of zeolite A using treated fly ash showed that the treated fly ashes affected the synthesis yield and properties of the obtained zeolites, helping to decrease the viscosity of modified asphalt cement and improve its workability.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Green & Sustainable Science & Technology
Anmar Dulaimi, Shakir Al-Busaltan, Mustafa Amoori Kadhim, Ruqayah Al-Khafaji, Monower Sadique, Hassan Al Nageim, Raed Khalid Ibrahem, Jan Awrejcewicz, Witold Pawlowski, Jasim M. Mahdi
Summary: This research aims to explore the potential utilization of waste and by-product materials as fillers in cold mix asphalt, in order to achieve mechanical properties comparable to traditional hot mix asphalt. The test results have shown that the incorporation of waste materials can significantly improve the stiffness and strength of the cold mixtures.
Article
Green & Sustainable Science & Technology
Xiangdao Hou, Chamod Hettiarachchi, Feipeng Xiao, Zifeng Zhao, Qian Xiang, Dara Yong
Summary: The application of reclaimed asphalt pavement (RAP) materials has become an important topic in sustainable road construction. Low carbon asphalt technology, such as warm mix technology, is utilized to reduce energy consumption and emissions in RAP application. Factors like blending time, temperature, and RAP content influence the blending efficiency of recycled asphalt mixtures.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Chemistry, Physical
Junwei Xiang, Hui Wang, Yu Xiang
Summary: This paper introduces the preparation process of warm-mix asphalt mixture and determines the optimal parameters for its construction, providing technical support and reference for warm-mix asphalt pavement construction in China.
Article
Construction & Building Technology
Qi Jiang, Na Li, Fei Yang, Yanfei Ren, Shaopeng Wu, Fusong Wang, Jun Xie
Summary: This study investigated the optimal warm-mix flame retardant asphalt (WF-A) through experimental design and testing, comparing its performance with other types of asphalt. It was found that the warm mix agent and flame retardant had different effects on asphalt performance, but were not conducive to aging resistance, while also reducing volatile organic compound emissions.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Materials Science, Characterization & Testing
Farhad Ahmadzadegan, Alireza Sarkar
Summary: This article presents an experimental study on the mechanical performance of modified warm mix asphalt mixtures with synthetic zeolite in nano and granule form. The results show that using zeolite in both forms can decrease moisture susceptibility and rutting depth, while increasing other physical properties.
JOURNAL OF TESTING AND EVALUATION
(2022)
Article
Materials Science, Characterization & Testing
Sri Gangadhar Mattaparthi, Nikitha Vootkuri, Krishna Prapoorna Biligiri
Summary: By optimizing the molar ratios and dosages of STEAM additives, it was possible to reduce the mixing and compaction temperatures when mixed with base asphalt binder. The best formulation also resulted in a 10°C reduction in production temperature while maintaining stiffness performance similar to control mixtures.
JOURNAL OF TESTING AND EVALUATION
(2023)
Article
Construction & Building Technology
Xingyu Yi, Ruikun Dong, Chenguang Shi, Jun Yang, Zhen Leng
Summary: By mixing rubber and waste oil to prepare waste rubber/oil asphalt rejuvenator, the properties of the asphalt can be improved, showing excellent storage stability and solubility. The ratio of rubber to oil has a significant impact on the properties of the rejuvenator and asphalt, with a higher rubber content contributing to better elasticity and resistance to softening, as well as beneficial rejuvenation effect.
ROAD MATERIALS AND PAVEMENT DESIGN
(2023)
Article
Construction & Building Technology
Linyi Yao, Zhen Leng, Jiwang Jiang, Fujian Ni
Summary: Decision makers have different attitudes towards risks and opportunities of maintenance and rehabilitation (M&R) strategies. A method was developed to quantitatively incorporate decision makers' attitudes towards risk and opportunity into network-level pavement maintenance planning.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2023)
Article
Construction & Building Technology
Linyi Yao, Zhen Leng, Jiwang Jiang, Chenze Fang, Fujian Ni
Summary: This study aims to investigate the effects of traffic load sequence on the cracking performance of asphalt pavement from both field and laboratory perspectives. It was found that heavier traffic loads in early stages are detrimental to the long-term pavement cracking performance. The LAS index plays a crucial role in the prediction and development of pavement cracks.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
You Wu, Peng Huang, Yunhong Yu, Chenguang Shi, Huimin Chen, Houzhi Wang, Jun Yang, Zhen Leng, Wei Huang
Summary: The crumb rubber (CR) recycled from waste tires can effectively improve the mechanical properties of bitumen. By analyzing the results of stress-controlled large amplitude oscillatory shear (LAOS) tests, it is concluded that the incorporation of CR has a positive influence on the nonlinear properties of bitumen, which effectively improves the stress bearing capacity. However, simply increasing the CR content does not always improve the performance of bitumen.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Construction & Building Technology
Haopeng Wang, Gordon D. Airey, Zhen Leng, Guoyang Lu
Summary: This study aims to optimize the preparation procedure for crumb rubber modified bitumen (CRMB) by investigating the effects of the procedure on the rheological properties and interaction mechanism of CRMB containing wax-based additives. Rubber swelling tests under various conditions were conducted to examine the effects of temperature and additives. Results show that adding wax-based additives can reduce the bitumen viscosity, promote the interaction between bitumen and rubber, and achieve similar swelling results at a lower temperature. However, a significant proportion of wax-based additives were found to penetrate rubber particles for warm-produced CRMB.
ROAD MATERIALS AND PAVEMENT DESIGN
(2023)
Article
Construction & Building Technology
Xiaoxiao Yu, Danning Li, Zhen Leng, Hongru Yao, Shifeng Wang
Summary: The hybridization of microscale and nanoscale tire rubber with SBS modified asphalt binder (SMB) was found to stabilize the molecular weight distribution and decrease oxidative condensation reaction during weathering. The hybrid modified asphalt exhibited improved crack resistance at low temperature and deformation resistance at high temperature, leading to enhanced natural weathering resistance of SMB.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Zhifei Tan, Denis Jelagin, Hassan Fadil, Zhen Leng, Rui Li, Jiwang Jiang, Peng Cao
Summary: In this study, a new virtual-specimen-based modeling approach was developed to account for aggregate contacts in asphalt concrete. The predicted complex moduli of gap-graded and dense-graded mixtures using this approach were compared with conventional image-based modeling and laboratory measurements. The virtual-specimen modeling showed that the contact region in gap-graded mixture with more large aggregates could transmit load better than in dense-graded mixture. Both modeling approaches provided good prediction accuracy, but the virtual-specimen models had more uniform and continuous stress distributions, enabling better computational convergence and nonlinear analysis of asphalt concrete.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Xiong Xu, Yaming Chu, Yi Luo, Yuhao Peng, Nannan Yang, Jiaming Yan, Xuyong Chen, Fuliao Zou, Anand Sreeram
Summary: This study proposes an innovative thermal-and-mechanochemical method to convert waste polypropylene into warm-mix asphalt modifiers through chemical reactions. By using dicumyl peroxide, maleic anhydride, and epoxidized soybean oil, maleated-epoxided degradation products were obtained. The modified asphalt with the proposed modifier showed improved performance compared to the virgin binder.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Construction & Building Technology
Jiwang Jiang, Zili Zhao, Xi Jiang, Zhen Leng, Bin Yang, Fujian Ni
Summary: This study developed a one-way evaporation method to simulate the field moisture migration of BE-CIR mixture specimens, and proposed an image processing method to extract the moisture distribution of the specimens using Multiple X-ray Computed Tomography scans. The results showed a gradient feature in the depth direction of the moisture distribution, with a more significant characteristic near the surface in contact with air. The gradient feature was observed at the curing ages of 3 to 7 days, and moisture migration from the edges and irregular thickness were more likely at the curing ages of 0 to 3 days. Curing temperature had a significant influence on the range of gradients and the variation of water content in the depth direction. The outcomes of this study enhance the understanding of the dynamic moisture migration characteristics of BE-CIR pavement over curing.
MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Multidisciplinary
Xin Sui, Siqi Wang, Zhen Leng, Bin Yang, Guoyang Lu
Summary: This study explored the feasibility of evaluating clogging in porous asphalt (PA) pavement using ground-penetrating radar (GPR). Laboratory tests showed that GPR can effectively evaluate clogging in PA pavement, and this effectiveness was validated through permeability tests.
Article
Construction & Building Technology
Rui Li, Zhen Leng, Hui Li, Hongzhou Zhu, Lingyun Kong, Xiong Xu
Summary: In this study, waterborne epoxy resin was used as a modifier to improve the mechanical performance of bitumen emulsion at high service temperatures. The effects of waterborne epoxy resin on the fatigue performance of bitumen emulsion were evaluated using stress-controlled time sweep test and linear amplitude (LAS) test. The results showed that the fatigue life of the emulsion residues increased with the incorporation of waterborne epoxy resin in the time sweep test, and the predicted fatigue life of the emulsion residues from the LAS test was strain dependent.
ROAD MATERIALS AND PAVEMENT DESIGN
(2023)
Article
Engineering, Environmental
Yohannes L. Yaphary, Mingjing He, Guoyang Lu, Fuliao Zou, Pengfei Liu, Daniel C. W. Tsang, Zhen Leng
Summary: This study fundamentally explored the capability and mechanism of asphalt and biochar-modified asphalt (BMA) in removing Cu and other heavy metals. The presence of biochar enhanced the absorption of Cu and other metals by modifying the spatial distribution of asphalt fractions. The findings provide insights for designing asphalts with improved functionality in reducing environmental pollution.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Construction & Building Technology
Yixin Zhou, Gang Xu, Houzhi Wang, Xianhua Chen, Yulou Fan, Jun Yang, Zhen Leng, Wei Huang
Summary: The study reveals the relationship between rubber devulcanization degree, rubber content, and the modification effect of asphalt binder. It shows that DRMA has good storage stability and rheological properties, and the performance of DRMA is significantly influenced by rubber devulcanization degree and content, especially in terms of elasticity ratio, rutting resistance, and fatigue resistance.
ROAD MATERIALS AND PAVEMENT DESIGN
(2023)
Article
Green & Sustainable Science & Technology
Jiwang Jiang, Jingling Wang, Zili Zhao, Fujian Ni, Duo Xu, Zhu Zhang, Zhen Leng
Summary: This research aims to develop a drying behavior model of BE-CIR pavement considering the heat-moisture coupling effects, which can help optimize the timing for overlay placement under different curing environments.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Environmental Studies
Fuliao Zou, Zhen Leng, Danning Li, Shaowei Zhang, Yohannes L. Yaphary, Guoyang Lu
Summary: This study investigates the leaching process of asphalt rubber (AR) using a multi-scale experimental method, and the results show that there are no significant concerns regarding leaching under most conditions. However, the leaching of metals from AR may pose risks to aquatic environments in acid rain areas, and the leachability of metals increases with service time.
TRANSPORTATION RESEARCH PART D-TRANSPORT AND ENVIRONMENT
(2023)
Article
Engineering, Environmental
Yui Kawasaki, Sayaka Nagao-Sato, Misa Shimpo, Kahori Fujisaki, Emi Yoshii, Rie Akamatsu, Petra Warschburger
Summary: This study qualitatively describes sustainable dietary behaviors (SDBs) that Japanese and German adults can implement in their lives, and quantitatively compares the similarities and differences in understanding SDBs between the two samples. The study found that Japanese participants were more focused on food waste prevention, while German participants were more focused on solving environmental problems.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Kechun Chen, Yuan Ding, Liming Yang, Zhihao Wang, Haoxuan Yu, Difan Fang, Yufa Feng, Liying Hu, Chenxi Xu, Penghui Shao, Xubiao Luo, Liang Chen
Summary: This study proposes a targeted repair scheme for the recovery of graphite anodes from spent LIBs by systematically characterizing and analyzing the structure and composition of spent graphite (SG). The results show that the repair scheme achieves effective SG repair and the repaired graphite anode displays excellent lithium storage performance.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Takao Ueda, Shigeki Koyanaka, Tatsuya Oki
Summary: Fires caused by accidental crushing of batteries are a serious issue in the e-waste recycling process. A new in-line sorting system that uses X-ray scanning and deep learning has been developed to accurately detect batteries. Through a validation study, the system achieved higher accuracy compared to other existing programs.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Hannes Geist, Frank Balle
Summary: Research on circular economy often lacks empirical data, especially in the theory of circular process design and design for remanufacturing. This study systematically collected and analyzed engineering data on seven remanufacturing processes in the European automotive remanufacturing industry for the first time, providing empirical support for circular engineering challenges, potentials, and solutions.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Xiaojing Li, Fan Lue, Nanlin Liao, Hua Zhang, Na Yang, Pinjing He
Summary: This study assesses and predicts the greenhouse gas emissions on the timeline as waste treatment technologies develop in Shanghai from 1991 to 2025 using the Life Cycle Assessment (LCA) methodology. The findings demonstrate that GHG emission has reached net-zero in 2019 owing to the application of alternative technologies and waste segregation.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Bingchun Liu, Haoyang Wang, Xiaoqin Liang, Yibo Wang, Zijie Feng
Summary: The expansion of the photovoltaic market has resulted in a significant increase in PV waste. Therefore, conducting scientific research to determine the importance of the circular economy for sustainable growth in the PV industry is essential. The study demonstrates that accurate prediction of PV installed capacity and quantifying the importance of recycling in balancing the supply and demand of raw materials can be achieved through a multi-factor installed capacity prediction model and recovery potential prediction.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Review
Engineering, Environmental
Chuanzhen Zhang, Baojing Gu, Xia Liang, Shu Kee Lam, Yi Zhou, Deli Chen
Summary: Reactive nitrogen is crucial for agriculture and human nutrition, but mismanagement can have detrimental effects on human health and ecosystem services, hindering the achievement of the 2030 Sustainable Development Goals. Progress towards nitrogen-related targets varies across countries, highlighting the need for integrated management to achieve overall synergies.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Alessandro Gatto, Marijke Kuiper, Corina van Middelaar, Hans van Meijl
Summary: This study examines the economic and environmental effects of transitioning towards more circular food systems in the European Union (EU27) by feeding animals with low-opportunity-cost feed and better utilizing local feed resources. The results show that providing subsidies for circularity and promoting the use of low-cost feed can increase animal production, but also have negative impacts on land use and emissions. On the other hand, promoting domestic feed sourcing through import tariffs can decrease animal production and greenhouse gas emissions in agriculture. However, complementary policies are needed to mitigate drawbacks and enhance benefits of a more circular agri-food system.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Jinbo Zhang, Liu Chen, Yulei Xie, Pingjian Yang, Zheng Li, Huaicheng Guo, Yang Zhang, Lirong Liu
Summary: This study examines the impact of carbon taxes on low-carbon development and climate change mitigation. By constructing a cross-system bi-layer model, the study finds that reasonable carbon taxes can promote the stability of the energy network, reduce carbon emissions and air pollutants, and optimize production efficiency and the structure of the energy system. This study contributes to a better understanding of the effects and implementation pathways of carbon taxes.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Konstantin Born, Mehmet Metehan Ciftci
Summary: Increasing recycling of metals is important for reducing reliance on mining, but it cannot fully meet future metal demand. Primary production of metals is expected to continue rising, highlighting the need for alternative circular economy strategies such as demand reduction and mitigating harmful impacts of primary metal production.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Yinqiu Ma, Lin Huang, Jiahui Li, Wei Cao, Yumei Cai
Summary: Afforestation and reforestation, such as China's Grain for Green Program, have shown to effectively mitigate greenhouse gas emissions and contribute to carbon sink capacity. This study highlights the significant carbon potential of the program and its potential application in other countries to reduce CO2 in the atmosphere.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Arlind Dervishaj, Kjartan Gudmundsson
Summary: This paper reviews digital tools for supporting the Circular Economy (CE) in the built environment and provides suggestions. The study identifies limitations in the functionalities of current tools, including a lack of representative data for LCA and underdeveloped circularity indicators. Further development is needed in terms of interoperability aspects, integration of more sources of data for LCA and circularity, and possibilities for a comprehensive evaluation of design choices.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Mohamadreza Y. Azarfam, Anuj Maheshwari, Frank D. Blum, Siddhesh Chaudhari, Clinton Switzer, Ranji Vaidyanathan, Jay C. Hanan, Sudheer Bandla
Summary: This study introduces a feasible method for manufacturing recycled composites using post-consumer carpets and recycled resin. The resulting composites have impressive strength and modulus, surpassing commercial thermoplastics and making them suitable for structural applications. This research presents a promising approach to address carpet landfilling and reduce reliance on additives.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Pujiang Shi, Tianle Huang, Hong Kit Lim, Chiew Kei Tan, Jong-Min Lee, Chor Yong Tay
Summary: This study developed a highly porous bioadaptive 3D sponge-like construct from plastic materials in discarded keyboards for advanced in vitro applications. The findings demonstrate the potential of using discarded keyboards as a waste-to-resource feedstock to achieve waste reduction and maximize value-capture.
RESOURCES CONSERVATION AND RECYCLING
(2024)
Article
Engineering, Environmental
Kuo-Jui Wu, Hailing Qiu, Caiyan Huang, Anthony S. F. Chiu, Ming-Lang Tseng
Summary: Government resource allocation practices for achieving carbon neutrality should be guided by dynamic system theory to identify potential dynamics. Carbon intensity control dynamics have a significant influence on other dynamics.
RESOURCES CONSERVATION AND RECYCLING
(2024)
