Article
Chemistry, Physical
Asad Elmagarhe, Qing Lu, Mohammad Alharthai, Mohammed Alamri, Ahmed Elnihum
Summary: This study investigates the effects of two waste materials, recycled concrete aggregate (RCA) and Type C fly ash, on the performance of porous asphalt mixture. The results show that incorporating RCA or fly ash slightly reduces the air-void content, permeability, and macrotexture of the mixture. However, further substitution of mineral filler with fly ash offsets the negative impact of RCA and brings the mechanical properties of the mixture with 10% RCA to levels comparable to those of the control mixture.
Article
Construction & Building Technology
I Holleran, D. J. Wilson, E. Masad, G. Holleran, E. Alrashydah
Summary: This paper investigates the effect of different percentages of a bio-rejuvenator on the volumetric and mechanical properties of porous asphalt mixes containing reclaimed asphalt pavement. The results show that increasing the rejuvenation dosage can improve the performance of porous asphalt. Atomic force microscopy can predict the optimum level of rejuvenation for reclaimed asphalt pavement and provide insights into the rejuvenation mechanisms at the nanoscale.
ROAD MATERIALS AND PAVEMENT DESIGN
(2023)
Article
Construction & Building Technology
Reza Soltanabadi, Kiachehr Behfarnia
Summary: The study analyzed the behavior of deep beams containing different types of aggregates. Results showed that replacing NCA with 50% of RCA and RAP led to a reduction in shear capacity, while using 100% replacement with modified mix design achieved similar shear capacity. Deep beams containing RAP had higher absorbed energy and showed greater ductility compared to RCA, which exhibited brittleness. Additionally, the cracking patterns analysis revealed differences in flexural and diagonal cracks among the specimens.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Civil
Petr Kucera (Kucera), Martin Lidmila, Petr Jasansky (Jasansky), Marek Pycha (Pycha), Michael P. N. Burrow, Gurmel S. Ghataora
Summary: The trend in railway engineering is to increase the use of reclaimed asphalt in asphalt concrete mixture for trackbed layers, as it has been shown to provide effective formation treatment, reduce track geometry loss, provide more uniform track support, and protect the subgrade effectively.
TRANSPORTATION GEOTECHNICS
(2021)
Article
Construction & Building Technology
Elvis Covilla-Varela, Emilio Turbay, Rodrigo Polo-Mendoza, Gilberto Martinez-Arguelles, Julio Cantero-Durango
Summary: This study investigates the feasibility of using recycled concrete aggregate as a partial replacement for natural aggregates in hot mix asphalt and warm mix asphalt production. It explores the mechanical performance, environmental impact, and cost-effectiveness of different levels of recycled aggregate content. The findings suggest that a 15% dosage of recycled aggregate is optimal for minimizing environmental burdens and maximizing cost-effectiveness in asphalt mixture fabrication. The study provides a comprehensive assessment of the potential of recycled concrete aggregate as a sustainable alternative to reduce the depletion of non-renewable resources.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Menglim Hoy, Vaiphot Samrandee, Worachet Samrandee, Apichat Suddeepong, Itthikorn Phummiphan, Suksun Horpibulsuk, Apinun Buritatum, Arul Arulrajah, Chakkrid Yeanyong
Summary: This study evaluated the performance of recycled asphalt pavement (RAP) as a substitute for natural aggregate in the maintenance of asphalt concrete for flexible pavements. The research also compared the mechanistic performance of warm mix and cold mix asphalt concretes using RAP. The results showed that RAP-AC60/70 and RAP-CMS-2 h mixtures had comparable performance to the conventional limestone-AC60/70 mixture, with lower material cost.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Reza Soltanabadi, Kiachehr Behfarnia
Summary: This study investigates the mechanical properties and microscopic structure of concretes with different aggregates. The results show that using recycled aggregates decreases the concrete's mechanical properties and alters the stress-strain curves and interfacial transition zone.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Wei Jiang, Dongdong Yuan, Chengwei Xing, Bowen Zhang, Jingjing Xiao, Teng Wang, Wangjie Wu
Summary: This paper investigates the potential of epoxy asphalt binder in road material. The study includes the preparation and evaluation of hot-mix and warm-mix epoxy asphalt binders, as well as the design and comparison of various porous asphalt concretes. The results show that epoxy asphalt binder has the ability to enhance road performance.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Construction & Building Technology
Chenchen Kuai, Jun Chen, Xijun Shi, Zachary Grasley
Summary: The study indicates that using PEG/SiO2 phase change composite to modify OGFC is an effective approach to reducing porous pavement temperature during summer.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Chuangmin Li, Qinhao Deng, Youwei Gan, Lubiao Liu, Wei Wang
Summary: The study explored the potential of using keratin biofiber derived from waste human hair to improve the engineering qualities of asphalt. The research found that the degreasing process enhanced the compatibility between the biofiber and asphalt, resulting in improved performance of the asphalt. The addition of keratin biofiber strengthened the resistance to elevated temperatures and increased the flexural strength of the asphalt mixture at lower temperatures, while also improving its resistance to water erosion.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Construction & Building Technology
Bin Lei, Qianghui Xiong, Hanbing Zhao, Wenkui Dong, Vivian W. Y. Tam, Zhihui Sun, Wengui Li
Summary: This study investigates the feasibility of using recycled concrete powder (RCP) as fillers in asphalt mortar to achieve sustainable and economical asphalt production. The physical properties of limestone powder (LSP) and RCP are analyzed and compared, including surface roughness, pore structures, and particle size. It is found that RCP is more effective than LSP in enhancing the performance of asphalt mortar. The interactions of RCP and LSP with asphalt mainly depend on physical interactions rather than chemical reactions. The use of RCP as fillers can improve the high-temperature rutting resistance of asphalt mortar.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Construction & Building Technology
Zhi Suo, Kailin Qi, Shijie Xu, Yitian Tan
Summary: This study demonstrates that by adding adsorbent to the asphalt mixture, active humidifying and dust suppression functions can be achieved. The addition of porous adsorbent increases the adsorption area and pore volume of the asphalt mixture, enhancing water retention and dust suppression capabilities.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Areej Abedalqader, Nasim Shatarat, Ahmed Ashteyat, Hasan Katkhuda
Summary: The use of Recycled Asphalt Pavement (RAP) and Recycled Coarse Aggregate (RCA) in concrete mixtures can reduce the mechanical properties of concrete, especially with increased replacement ratios and elevated temperatures. However, the potential of RAP and RCA to be incorporated in concrete mixes at high temperatures is still significant considering the efforts to reduce their negative impacts on the environment and human health.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Adeyemi Adesina, Sreekanta Das
Summary: This study investigates the feasibility of using recycled asphalt as aggregates in ECC, finding that it may compromise the performance of traditional ECC but offset the loss through benefits in carbon footprint and cost reduction. Despite the compromised performance, all ECC mixtures developed in the study are found suitable for structural applications.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Civil
Maziar Mivehchi, Haifang Wen, Yankai Wen, Lin Wang
Summary: This study evaluated rut depths and cracking test (CT) index values of different asphalt mixes. The results showed that rut depth is highly sensitive to binder content, performance grade, aggregate angularity, and RAP/RAS content. The CT index is sensitive to binder content, air void content of the mixture, aggregate gradation, and RAP/RAS content. Low-RAP mixes also showed worse cracking performance than mixes without RAP.
TRANSPORTATION RESEARCH RECORD
(2023)
Article
Construction & Building Technology
Lily D. Poulikakos, Bernhard Hofko
Summary: This project tested eight commonly used mixtures in Switzerland and found that different test methods can affect the results, with variations in stiffness and fatigue resistance performance.
ROAD MATERIALS AND PAVEMENT DESIGN
(2021)
Review
Construction & Building Technology
Peter Mikhailenko, Zhengyin Piao, Muhammad Rafiq Kakar, Moises Bueno, Sahand Athari, Reto Pieren, Kurt Heutschi, Lily Poulikakos
Summary: Traffic noise is a persistent form of environmental pollution that negatively affects human health in urban environments. This literature review examines the constantly evolving low-noise asphalt pavement technologies and evaluation techniques for researchers and professionals in the field. Various test methods for assessing the acoustic properties of asphalt pavements are discussed, including both laboratory and field environments. The Close-Proximity (CPX) method is the most commonly used field test, followed by Statistical Pass-By (SPB) and On-Board Sound Intensity (OBSI) methods. Additionally, methods for measuring non-acoustic characteristics relevant to noise, such as surface texture, porosity, and airflow resistivity, are reviewed. Porous asphalt concrete (PAC) and its variants are found to consistently exhibit low-noise properties, although they do have some limitations in terms of durability and maintenance. Various prediction models for acoustical performance are also discussed.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2022)
Article
Construction & Building Technology
M. Munoz, R. Haag, R. Figi, C. Schreiner, M. Zaumanis, M. C. Cavalli, L. D. Poulikakos, N. V. Heeb
Summary: The study investigated the impact of rejuvenators on reclaimed asphalt pavement, finding that rejuvenators did not mobilise 2-3 ring PAHs from RAP materials, and aging reduced the tendency for PAH leaching.
ROAD MATERIALS AND PAVEMENT DESIGN
(2022)
Article
Engineering, Civil
Lily D. Poulikakos, William Buttlar, Nicolas Schuwer, Davide Lo Presti, Tobias Balmer, Moises Bueno
Summary: Laboratory scale mechanical performances of asphalt mixtures modified with engineered crumb rubber were investigated, showing that ECR mixtures performed well in most aspects and met relevant standard requirements. In advanced testing, ECR mixtures performed similarly to reference polymer mixtures in high temperature tests, but slightly worse in semi-dense mixtures, while performing similarly or better in low temperature tests.
SUSTAINABLE AND RESILIENT INFRASTRUCTURE
(2022)
Article
Construction & Building Technology
Mahdieh Shakoorioskooie, Michele Griffa, Andreas Leemann, Robert Zboray, Pietro Lura
Summary: In this study, a laboratory-scale methodology using X-ray micro-tomography and cesium as a contrast agent was proposed to advance the understanding of cracking due to alkali-silica reaction (ASR) in concrete. The addition of cesium slightly accelerated the ASR kinetics, but the crack patterns with and without cesium were statistically equivalent. The study also found that ASR products may initially be a low-viscosity gel that can flow away from the source aggregate and settle later elsewhere as a rigid phase upon calcium uptake.
CEMENT AND CONCRETE RESEARCH
(2021)
Article
Construction & Building Technology
Martins Zaumanis, Lukas Boesiger, Bernhard Kunz, Henry Mazzoni, Peter Bruhin, Samuel Mazor, Lily Poulikakos
Summary: Three indexes, Chunk index, Breakdown index, and Filler increase index (CBF indexes), are proposed to evaluate RAP processing methods, allowing for quantitative comparison and optimization of crusher configuration.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2022)
Article
Engineering, Environmental
Zhengyin Piao, Moises Bueno, Lily D. Poulikakos, Stefanie Hellweg
Summary: This study utilized life cycle assessment to evaluate the environmental impacts of rubberized semi-dense asphalt pavement. Two scenarios were considered, with the results indicating that reducing waste tires used for clinker production did not improve the environmental impacts of the pavement.
RESOURCES CONSERVATION AND RECYCLING
(2022)
Article
Construction & Building Technology
Marjan Tusar, Muhammad Rafiq Kakar, Lily D. Poulikakos, Emiliano Pasquini, Andrea Baliello, Marco Pasetto, Laurent Porot, Di Wang, Augusto Cannone Falchetto, Davide Dalmazzo, Davide Lo Presti, Gaspare Giancontieri, Aikaterini Varveri, Rosa Veropalumbo, Nunzio Viscione, Kamilla Vasconcelos, Alan Carter
Summary: Inter-laboratory experiments were conducted to evaluate the impact of directly blending plastic waste into bitumen and to assess the properties of the blends using various testing methods. The experiments showed that the addition of plastic waste does not chemically alter the bitumen. The performance of the blends varied with temperature, with the bitumen and plastic waste behaving elastically at low temperatures and the bitumen becoming viscoelastic at higher temperatures. Furthermore, the blends with plastic waste exhibited better fatigue performance in terms of stress and fatigue life.
ROAD MATERIALS AND PAVEMENT DESIGN
(2023)
Article
Construction & Building Technology
Peter Mikhailenko, Martin Arraigada, Zhengyin Piao, Lily D. Poulikakos
Summary: The incorporation of waste materials into road materials can reduce the consumption of virgin materials and provide an alternative destination for waste. This study focuses on the use of construction waste fillers in semidense asphalt mixtures and found that the filler replacement has little impact on the stiffness modulus, slightly lowers the fatigue resistance, but has a similar damage rate.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Lily D. Poulikakos, Emiliano Pasquini, Marjan Tusar, David Hernando, Di Wang, Peter Mikhailenko, Marco Pasetto, Andrea Baliello, Augusto Cannone Falchetto, Miomir Miljkovic, Marko Oreskovic, Nunzio Viscione, Nikhil Saboo, Gabriel Orozco, Eric Lachance-Tremblay, Michel Vaillancourt, Muhammad Rafiq Kakar, Nicolas Bueche, Jan Stoop, Lacy Wouters, Davide Dalmazzo, Gustavo Pinheiro, Kamilla Vasconcelos, Fernando Moreno Navarro
Summary: This research investigated the performance of asphalt mixtures modified with polyethylene (PE) waste. The results showed that the PE modified mixtures had better compactability, higher stiffness, lower creep rate, and improved resistance to permanent deformation compared to the control mixtures. The wheel tracking tests also indicated similar or better results when 1.5% PE was added to the control mixture. The findings suggest that using PE as a performance-enhancing additive in asphalt pavements is a viable and environmentally friendly option.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Engineering, Environmental
Lei Lyu, Peter Mikhailenko, Zhengyin Piao, Elham H. Fini, Jianzhong Pei, Lily D. Poulikakos
Summary: This study aims to create bio-modified rubberized asphalt by hybrid reusing waste bio-oils and scrap tires and unraveling the underlying modification mechanisms using microscopy and chemo-rheological investigations. The research shows that bio-modification has deoxidizing and devulcanizing effects on crumb rubber, and it also decreases the glass transition temperature of the asphalt binder, enhancing its low-temperature properties. The addition of bio-oils and crumb rubber mitigates phase separation in the asphalt binder and changes the deformation resistance mechanisms. The study also reveals that bio-modified asphalt rubber has a more elastic response at high temperatures and a more viscous response at low temperatures.
RESOURCES CONSERVATION AND RECYCLING
(2022)
Article
Construction & Building Technology
Mahdieh Shakoorioskooie, Michele Griffa, Andreas Leemann, Robert Zboray, Pietro Lura
Summary: This study proposes the use of two complementary contrast agents to address the contrast issue in the study of alkali-silica reaction (ASR) in concrete. By optimizing the content of the contrast agents, a quantitative characterization of ASR products and cracks was achieved, with the ability to differentiate their presence in aggregates and cement paste.
CEMENT AND CONCRETE RESEARCH
(2022)
Article
Microscopy
Nancy A. Burnham, Lei Lyu, Lily Poulikakos
Summary: Atomic force microscopy (AFM) is a valuable tool for studying nanoscale structures, but the interpretation of AFM images can be influenced by artefacts. In this paper, we discuss the common problems and provide solutions based on our study of 'bee' structures in asphalt binder using AFM and its variations AFM-IR and PF-QNM. Our aim is to help researchers present their results accurately and improve the quality of AFM research.
JOURNAL OF MICROSCOPY
(2023)
Article
Construction & Building Technology
Francesco Preti, Elena Romeo, Antonio Roberto, Eshan V. Dave, Jo E. Sias, Gabriele Tebaldi
Summary: The influence of temperature on the mechanical properties of Bituminous Stabilized Materials (BSMs) was investigated in this research. Triaxial shear strength tests were performed at different temperatures, and the experimental results were used to develop finite element models for defining the local stress and temperature-dependent mechanical properties. A 2D axisymmetric finite element model of multilayer pavement was developed to analyze the effects of plasticity and temperature. The comparison of responses from different pavement structures under the same load applications at different temperatures determined the most critical scenario. In conclusion, plasticity and temperature are crucial factors for BSMs analysis and design, and linear-elastic assumptions overestimate the service life of rehabilitated pavements.
ROAD MATERIALS AND PAVEMENT DESIGN
(2023)
Article
Green & Sustainable Science & Technology
Lei Lyu, Jianzhong Pei, Nancy A. Burnham, Elham H. Fini, Lily D. Poulikakos
Summary: The translation discusses the effects of thermal oxidation and ultraviolet exposure on asphalt binders, the aging-induced evolution of nanoscale domains, and the effectiveness of adding rubber and bio-oils for delaying aging. The study reveals that different domains in the asphalt binder react differently to aging, and bio-modification enhances the stability of the domains, delaying aging.
JOURNAL OF CLEANER PRODUCTION
(2023)