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)
Review
Green & Sustainable Science & Technology
Mohsen Alae, Ling Xu, Zhenglong Cao, Xiyong Xu, Feipeng Xiao
Summary: Incorporating reclaimed asphalt pavement (RAP) with a rejuvenator can improve the fatigue performance of the mixture. However, the effectiveness of rejuvenators in enhancing fatigue resistance varies due to different types and dosages of rejuvenators, RAP sources and percentages, and testing methods. A comprehensive literature review and laboratory study are conducted to understand the rejuvenation mechanism and evaluate the impact of rejuvenators on RAP binder and mixture. It is found that polymer modification can significantly improve the fatigue performance of rejuvenated RAP materials, but a consistent indicator for determining fatigue resistance is lacking.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Green & Sustainable Science & Technology
Chao Yang, Jianwei Zhang, Fei Yang, Ming Cheng, Yafei Wang, Serji Amirkhanian, Shaopeng Wu, Minghua Wei, Jun Xie
Summary: The circular utilization of reclaimed asphalt pavement (RAP) is a promising trend for sustainable construction due to economic benefits and conservation of non-renewable natural resources. This study explored the properties of blended asphalt, the performance of recycled asphalt mixtures (RAM), and their correlation to facilitate the further application of high RAP content asphalt mixtures. The results indicated that incorporating rejuvenators and virgin asphalt in aged asphalt can improve its characteristics and road performances of high dosage RAP recycled asphalt mixtures.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Green & Sustainable Science & Technology
Kunpeng Zheng, Jian Xu, Jie Wang
Summary: This study investigates the viscoelastic properties of recycled asphalt mixtures incorporating high-content reclaimed SBS modified asphalt pavement. The research shows that the recycled mixtures have improved high-temperature stability but are prone to cracking at low temperatures. A content of 50% RAP-SBS is recommended, and the aging resistance performance can be enhanced by adding a rejuvenating agent.
Article
Green & Sustainable Science & Technology
Qiang Li, Guangxu Sun, Yang Lu, Yuanpeng Meng, Sang Luo, Lei Gao
Summary: The study evaluates the performance of recycled asphalt binders prepared using warm-mix recycling technology in terms of linear viscoelasticity, rutting resistance, fatigue resistance, and low-temperature crack resistance. Different warm mix asphalt (WMA) technologies and modifiers have significant effects on the performance of recycled binders. The addition of crumb rubber powder (CRP) in warm-mix recycled binders shows the best comprehensive performance, and suitable modifiers are recommended to compensate for the loss of pavement performance caused by the use of WMA technologies and RAP.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Environmental Sciences
Ankit Sharma, Gondaimei Ransinchung Rongmei Naga, Praveen Kumar
Summary: This study introduces a novel method to construct the master curve of recycled binders and verifies its applicability for different sources of reclaimed asphalt pavement (RAP). An alternative approach based on damping energy area (DEA) is proposed to calculate the allowable RAP content. The rheological interaction between RAP binder and RA is explored using the recycled binder compatibility index (RBCI).
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Construction & Building Technology
Jie Gao, Yuquan Yao, Liang Song, Jing Xu, Jiangang Yang
Summary: This study adopted a method from the German TL Asphalt-StB 07 guideline to homogenize hybrid RAP and demonstrated its effectiveness in reducing the heterogeneity of hybrid RAP and improving the quality stability of RHMA.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Construction & Building Technology
Jing Xu, Hui Chen, Yong Wen, Bin Xue, Rui Li, Jianzhong Pei
Summary: This study found that adding recycling oils may impair the durability of asphalt binders with reclaimed asphalt materials, but have little effect on the chemical reaction (oxidation). There is a good correlation between rheological and chemical changes, but it is also influenced by the material dependency.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
G. Bharath, K. Sudhakar Reddy, Vivek Tandon, M. Amaranatha Reddy
Summary: This study focuses on the fatigue characteristics of asphalt mixtures containing Recycled Asphalt Pavement (RAP) material, finding that an increase in RAP content can lead to longer fatigue life. The use of open graded mixes allows for larger binder contents and higher RAP contents in the mix. The research shows a strong correlation between the fatigue lives of RAP mixes and the fatigue parameters of virgin-RAP binder blends prepared in suitable proportions.
ROAD MATERIALS AND PAVEMENT DESIGN
(2021)
Article
Construction & Building Technology
Zengping Zhang, Jia Sun, Li Wang, Yongbiao Zhu, Hao Liu, Ting Huang, Zhigang Huang
Summary: By synthesizing polyurethane prepolymers with different NCO contents, the drawbacks of epoxy asphalt binder can be improved. PTPU-modified asphalt binder has good storage stability and high- and low-temperature performance. The NCO content can be adjusted according to actual needs during application.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Article
Construction & Building Technology
Ali Jamshidi, Greg White, Kiyofumi Kurumisawa
Summary: The article discussed the concepts, theories, and engineering properties of epoxy asphalt technology, highlighting its superior rheological properties and structural performance compared to traditional asphalt mixtures. However, concerns remain regarding recyclability, initial strength, and total cost of pavement construction.
ROAD MATERIALS AND PAVEMENT DESIGN
(2022)
Article
Construction & Building Technology
S. Pouget, P. Marsac, A. Pedraza, C. Sauzeat, H. Di Benedetto, V Gaudefroy, L. Boulange, A. Pevere, V Mouillet
Summary: This paper presents the main results of the French collaborative project Improvmure, which focused on the recycling of bituminous mixtures and the use of warm manufacturing process. The study showed the feasibility of multiple recycling cycles with high rates and the advantages of warm mix manufacturing process.
ROAD MATERIALS AND PAVEMENT DESIGN
(2023)
Article
Green & Sustainable Science & Technology
Douglas Martins Mocelin, Mayzan Maher Isied, Cassie Castorena
Summary: This study uses a new mixture design method, called AAMD, to evaluate the impact of recycled binder availability (RBA) on the volumetric properties of asphalt mixtures. The results show that assuming a reasonable RBA is crucial, especially for mixtures containing 15% RAP and/or 4% RAS.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Construction & Building Technology
Zifeng Zhao, Jiayu Wang, Xiangdao Hou, Qian Xiang, Feipeng Xiao
Summary: Two artificial neural network models were developed in this study to predict the viscosity of rubberized asphalt rejuvenated reclaimed asphalt pavement binders. Through sensitivity analysis, it was found that blending temperature for aged binder, viscosity measuring temperature, original binder blending time, and reclaimed asphalt pavement blending time were important variables contributing to the binder viscosity.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
Ankit Sharma, G. D. R. N. Ransinchung, Praveen Kumar
Summary: This study revisited the effectiveness of different mixing rules for recycled asphalt pavement, and found that high performance grade (PG) temperature, softening point, Grunberg & Nissan, and phase angle mixing rules are satisfactory in predicting the properties of recycled binders.
ROAD MATERIALS AND PAVEMENT DESIGN
(2022)
Article
Construction & Building Technology
Gabriel Bazi, Elie Y. Hajj, Alvaro Ulloa-Calderon, Per Ullidtz
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2020)
Article
Construction & Building Technology
Lorena Garcia Cucalon, Fawaz Kaseer, Edith Arambula-Mercado, Amy Epps Martin, Nathan Morian, Sara Pournoman, Elie Hajj
ROAD MATERIALS AND PAVEMENT DESIGN
(2019)
Review
Construction & Building Technology
Jhony Habbouche, Elie Y. Hajj, Peter E. Sebaaly, Murugaiyah Piratheepan
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2020)
Article
Construction & Building Technology
Jose Corrales-Azofeifa, Adrian Ricardo Archilla, Fabiola Miranda-Arguello, Luis Loria-Salazar
ROAD MATERIALS AND PAVEMENT DESIGN
(2020)
Article
Energy & Fuels
Max Berkowitz, Matthew Filipovich, Alejandra Baldi, Simon A. M. Hesp, Jose P. Aguiar-Moya, Luis G. Loria-Salazar
Article
Engineering, Civil
Ana Vargas-Sobrado, Luis Rodriguez-Solano, Jose Aguiar-Moya, Henry Hernandez-Vega, Luis Loria-Salazar
TRANSPORTATION RESEARCH RECORD
(2019)
Article
Construction & Building Technology
Tania Avila-Esquivel, Jose Pablo Aguiar-Moya, Edgar Camacho-Garita, Luis Loria-Salazar
Summary: The initial full-scale experiment in Costa Rica under the program PaveLab aimed to identify the impact of typical construction practices on pavement stability, as well as the importance of moisture in this regard. Preliminary results highlighted the significance of moisture on pavement stability and the effects of different materials and thicknesses on structural capacity.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2021)
Article
Materials Science, Characterization & Testing
Edgar Camacho-Garita, J. P. Aguiar-Moya, T. Avila-Esquivel, L. Loria-Salazar
JOURNAL OF TESTING AND EVALUATION
(2020)
Article
Construction & Building Technology
Jhony Habbouche, Elie Y. Hajj, Peter E. Sebaaly, Murugaiyah Piratheepan
Summary: Extensive laboratory testing and statistical analyses confirmed a fatigue-based structural layer coefficient of 0.54 for HP asphalt concrete mixtures in new pavements. Using mechanistic-empirical analyses, it was found that HP mixes generally outperformed PMA mixes in terms of rutting, shoving, and top-down cracking in the AC layer. Additionally, the observed rut depths in unbound layers were below the maximum allowable depth, indicating acceptable performance for HP pavement sections with thinner AC layers. Overall, the verification efforts supported the use of a 0.54 structural coefficient for HP AC mixes in new pavements.
ROAD MATERIALS AND PAVEMENT DESIGN
(2021)
Article
Construction & Building Technology
(Jey) Jeyakaran Thavathurairaja, Adam J. Hand, Murugaiyah Piratheepan, Peter E. Sebaaly, Elie Y. Hajj
Summary: In this study, a stepwise mechanistic analysis approach was used to determine representative resilient modulus (Mr) values for unbound materials typically used in Nevada. Laboratory tests and constitutive models were employed to evaluate the resilient modulus values of crushed aggregate base, borrow material, and SG soils. Finite element analysis was conducted to compute stresses and deflection in conventional flexible pavements, which were then used to estimate the Mr values of the unbound layers.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Jhony Habbouche, Ilker Boz, Elie Y. Hajj, Nathan E. Morian
Summary: The study found that HP-modified asphalt binders have greater resistance to aging and chemical degradation compared to conventional PMA binders, leading to an increased longevity in terms of performance.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2022)
Article
Construction & Building Technology
Joao Paulo Costa Meneses, Kamilla Vasconcelos, Liedi L. B. Bernucci, Elie Hajj
Summary: There is still no consensus on the most appropriate compaction method for assessing cold recycled asphalt mixtures (CRAMs). Studies have shown that different compaction methods have effects on the mechanical properties of CRAMs, but these effects were not considered significant for the scenario analyzed in this study.
ROAD MATERIALS AND PAVEMENT DESIGN
(2021)
Article
Construction & Building Technology
Nicole G. Elias, Adam J. T. Hand, Peter E. Sebaaly, Elie Y. Hajj, Murugaiyah Piratheepan, Scott Gibson
Summary: The research aims to help local agencies transition from the Marshall method to the BMD for designing asphalt mixtures, using the Superpave gyratory compactor and performance tests. Based on experimental data, an optimized and high-performing mix design approach was created, including the use of 15% RAP, along with an implementation plan for local agencies.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2022)
Article
Materials Science, Characterization & Testing
Jhony Habbouche, Murugaiyah Piratheepan, Elie Y. Hajj, Sailesh Bista, Peter E. Sebaaly
Summary: This paper presents the validation process and performance evaluation of the structural layer coefficient for high polymer asphalt mixtures on asphalt pavements. The results support the selection of 0.54 for the reduced-thickness HP asphalt concrete layer.
JOURNAL OF TESTING AND EVALUATION
(2022)
Article
Engineering, Civil
Rami Chkaiban, Elie Hajj, Adam John Thomas Hand
Summary: Laboratory tests have been developed and used to improve the performance predictions of volumetric-based asphalt mix designs. However, the traditional volumetric requirements have limited innovation and potential improvements, leading to the need for a balanced mix design approach.
TRANSPORTATION RESEARCH RECORD
(2022)