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
Construction & Building Technology
Jizhe Zhang, Chenchen Guo, Tingting Chen, Wenwu Zhang, Kai Yao, Chao Fan, Ming Liang, Chunhui Guo, Zhanyong Yao
Summary: This study investigated the influence of self-developed rejuvenators on the mechanical performance of high percent RAP recycled asphalt mixtures. The results showed that these rejuvenators improved the cracking behavior and fatigue life of the mixtures, although they made them prone to permanent deformation, their moisture durability was still better than that of new asphalt mixtures.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
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
Liya Jiao, Mohamed Elkashef, John T. Harvey, Mohammad Ashiqur Rahman, David Jones
Summary: The study reveals that the fatigue performance of asphalt mixtures decreases with the increase of RAP content above 20%, and the storage time plays an important role.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
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
Farzaneh Tahmoorian, Bijan Samali, John Yeaman, Mehdi Mirzababaei
Summary: The high rate of construction and demolition waste materials leads to an increase in stockpiled waste materials. This study investigates the feasibility of using recycled construction aggregates (RCA) obtained from the construction and demolition sector as a substitute for virgin aggregates in asphalt mixes. The results show that asphalt mixtures containing 20% to 22% RCA provide comparable volumetric properties to the control samples, indicating that the use of RCA for partial aggregate replacement in hot mix asphalt (HMA) is feasible.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2022)
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
Reza Imaninasab, Luis Loria-Salazar, Alan Carter
Summary: This research aims to modify mix design practices and criteria, and develop a ranking system to better fabricate and evaluate asphalt mixtures with very high RAP content. It has been observed that paying more attention to gradation within mix design is crucial, and rejuvenation and aging potential are key factors in mixtures with high RAP content.
CONSTRUCTION AND BUILDING MATERIALS
(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
Materials Science, Multidisciplinary
Hong Zhang, Yuanshuai Dong, Yun Hou, Zhenyu Qian, Jialei Tian, Yi Zhang
Summary: This study focused on the treatment method of iron tailings sand (ITS) plus reclaimed inorganic binder stabilized aggregate (RAI) solid waste. Through testing the road performances of the recycled mixture, it was found that the new ITS and RAI mixture can achieve excellent compressive performance and meet different levels of design strength under various load conditions. The recycled mixture has better anti-water damage and frost resistance properties than cement-stabilized aggregate, but its shrinkage and fatigue properties are inferior. Additionally, it can reduce carbon emissions in engineering applications.
Article
Construction & Building Technology
Farah Zaremotekhases, Husam Sadek, Marwa Hassan, Charles Berryman
Summary: This study examined the mechanical performance of asphalt mixtures containing RAP using various WMA technologies, concluding that WMA mixtures with 35% RAP exhibit enhanced resistance against permanent deformations and improved cracking performance. The incorporation of higher percentages of RAP and WMA technologies contributed to better cracking resistance and fatigue life of the WMA-RAP mixtures.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Karina Suzuki, Kamilla Vasconcelos, Luis Miguel Klinsky, Iuri Bessa
Summary: This research examines the use of recycled asphalt mixtures (RAMs) as a wearing course in heavily trafficked highways. The study investigates the impact of different percentages of recycled asphalt pavement (RAP) and the addition of a recycling agent (RA) on the mechanical properties of RAMs. RAMs with varying RAP contents (10%, 20%, 25%, 35%, 50%, and 65%) were evaluated, and the effects of the RA on two specific mixtures (25% and 50% RAP content) were also studied. The results show that conditioning the RAP during production influences the activation of the RAP binder and the mechanical behavior of the mixtures. RAMs with higher RAP contents exhibit better resistance to permanent deformation and fatigue cracking due to the activation of the RAP asphalt binder. Additionally, the inclusion of the RA enhances fatigue resistance without compromising rutting resistance for higher RAP contents.
ROAD MATERIALS AND PAVEMENT DESIGN
(2023)
Article
Construction & Building Technology
Muhammad Sohail Jameel, Ammad Hassan Khan, Zia ur Rehman, Muhammad Akhtar Tarar
Summary: There has been a significant production of Reclaimed Asphalt Pavement (RAP) from asphalt pavement maintenance and rehabilitation processes over the years. This material is typically discarded, leading to negative environmental impacts. However, it can be reused for pavement construction by using agents that restore its original properties. This study shows that sunflower and soybean oils can effectively rejuvenate aged asphalt in RAP mixtures, resulting in improved resistance to low-temperature cracks, moisture susceptibility, and permanent deformation.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Yuefeng Zhu, Jiawei Zhang, Chundi Si, Tao Yan, Yanwei Li
Summary: The study found that asphalt materials undergo aging at high temperatures, impacting the cracking resistance of recycled blends. Recycled blends are more sensitive to aging compared to virgin SBS modified asphalt, and become stiffer with increased RAP binder dosage. Additionally, higher doses of RAP mixtures show better cracking resistance under extended aging times due to potential chemical processes between the binders.
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)
