Article
Construction & Building Technology
Wenjing Xia, Zihang Xu, Tao Xu
Summary: Shape memory polyurethane/styrene butadiene styrene modified asphalt mortar (PSAM) was prepared to investigate the self-healing behaviors of cracks in fiber reinforced asphalt mortar. The shape memory properties of lignin fiber reinforced PSAM (LFAM) and polyester fiber reinforced PSAM (PFAM) were analyzed. The influence of filler-asphalt ratio and fiber type on the multi-cycle self-healing results of LFAM and PFAM were examined. It was observed that PFAM exhibited better shape memory performance and higher self-healing effectiveness compared to LFAM.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Construction & Building Technology
Fuquan Ma, Xue Luo, Hui Li, Zhiyi Huang
Summary: This study introduces a new approach to measure the internal stress of asphalt binder and quantify the relationship between its healing capability and damage levels. By utilizing healing kinetics method and energy-based mechanistic approach, the healing capability of asphalt binder under different damage levels is successfully characterized.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Xin Qiu, Weihao Cheng, Wenyi Xu, Shanglin Xiao, Qing Yang
Summary: This paper investigates the stage characteristics of fatigue damage of asphalt binders and their self-healing behaviors. The rheological behavior and fracture surface morphology were analyzed to understand the fatigue evolution characteristics. A method for interpreting the self-healing capability of asphalt binders at different fatigue stages was proposed. The effect of temperature on the self-healing properties of different aging asphalt binders was explored.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2022)
Article
Construction & Building Technology
Zhidong Zhang, Shihui Shen, Bin Shi, Honglei Wang
Summary: This study proposed modifications to the existing HWTD to investigate its potential as a cracking device, which was found to simulate fatigue cracking phenomenon and provide consistent results with standard SCB tests, showing its capability in quantifying fatigue behavior of specific mixtures.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Xingren Zhou, Weimin Song, Hao Wu
Summary: In this study, fatigue tests were conducted using a novel load-controlled mode to evaluate the effect of reclaimed asphalt pavement (RAP) on the fatigue performance of hot-mix asphalt (HMA). Results showed that the addition of 25% RAP prolongs the fatigue life at 25 degrees C, while the addition of 50% RAP reduces the fatigue life. However, at -10 degrees C, both 25% and 50% RAP have a negative effect on the fatigue life.
Article
Materials Science, Multidisciplinary
Yiqun Zhan, Hao Wu, Weimin Song, Lin Zhu
Summary: This study investigated the diffusion between virgin and aged asphalt binders in recycled asphalt mixtures using molecular dynamics simulation. The results showed that the diffusion coefficient of virgin asphalt was the highest, and the diffusion between virgin and aged asphalt mainly occurred from virgin to aged asphalt. Furthermore, the mutual attractive interactions among molecules in the layers became stronger, indicating improved cohesion properties.
Article
Construction & Building Technology
Fuquan Ma, Fengxia Chi, Hui Li, Xue Luo, Yuqing Zhang, Zhiyi Huang
Summary: This study aims to explore the relationship between ageing and healing of asphalt binder, and describes this relationship using healing activation energy and ageing activation energy. The results show that there is not much difference in the healing activation energy of aged asphalt binder compared to the sum of ageing activation energy and healing activation energy of unaged binder.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2022)
Article
Chemistry, Physical
Keke Lou, Xing Wu, Peng Xiao, Cong Zhang
Summary: Basalt fiber can effectively increase the fatigue life and cumulative dissipated energy of asphalt mixtures, showing a linear correlation with fatigue life. It is suggested that the appropriate fatigue failure criterion for asphalt mixtures is when the stiffness modulus reaches 15-25% of the initial value.
Article
Green & Sustainable Science & Technology
Ziming Liu, Song Li, Yongdan Wang
Summary: This study explores the effects of waste engine oil (WEO) and polyphosphoric acid (PPA) on the self-healing and fatigue behavior of asphalt binder. The results show that the addition of PPA and WEO can improve the fatigue performance and self-healing of asphalt binder.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Construction & Building Technology
Hui Guo, Cheng Du, Yu Chen, Dan Li, Wenjun Hu, Xiao Lv
Summary: By applying polyurea elastomer coating on concrete, the impact resistance of the concrete can be effectively improved. The position of the coating and the strain rate have an impact on the dynamic properties and failure modes. Increasing impact velocity and incident energy peak can enhance the dissipated energy of the composite specimens.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Xiaowei Wang, Jiaxing Ren, Xinyu Hu, Qiang Li, Xiaoping Ji
Summary: The aim of this study is to develop a meso-scale finite element modeling considering the random inhomogeneous distribution of binder to investigate the adhesive/cohesive failure behaviors of porous asphalt mixtures (PAC). The study found that the adhesive/cohesive strength of the binder increased with its thickness, and the random inhomogeneous distribution of the binder had a significant impact on the damage initiation and evolution of adhesive/cohesive failure behaviors of PAC.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Tiago Ribeiro, Ana Cristina Freire, Margarida Sa-da-Costa, Joao Canejo, Vinicius Cordeiro, Rui Micaelo
Summary: This study tests a visual method to investigate the working mechanism of encapsulated rejuvenators in bituminous mixtures. Clear bituminous mixtures were produced using a colorless synthetic binder and a pigment was added to the rejuvenator incorporated in the calcium alginate capsules. The results show limited modification of the binder by the rejuvenator and evidence of rejuvenator release in the bituminous mixtures containing capsules.
Article
Construction & Building Technology
Anqi Chen, Gordon D. Airey, Nick Thom, Jack Litherland, Rufus Adjetey Nii-Adjei
Summary: The study introduces a new stiffness change tendency method (SCTM) to model the relationship between stiffness and number of cycles in asphalt concrete using a logistic model. This method helps to determine critical laboratory fatigue failure points and characterize different fatigue damage stages, showing good agreement with laboratory data and proving its applicability in simulation of pavement deterioration.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Biochemistry & Molecular Biology
Yan Li, Haiwei Zhang, Zirui Wu, Bowei Sun
Summary: By introducing a vacuum pad between two layers filled with asphalt molecules, self-healing models of neat and aged asphalt binder were established to investigate the self-healing behavior of asphalt binder at the molecular scale. The effects of oxidative aging, damage degree, and healing temperature on the self-healing property were revealed through simulation at various healing conditions. The findings provided valuable insights into the self-healing property of asphalt binder.
Article
Chemistry, Multidisciplinary
Ahmed S. Mohamed, Sherif El-Badawy, Feipeng Xiao
Summary: Rejuvenating reclaimed asphalt binder using crumb rubber-modified binder is a sustainable paving technology that utilizes waste materials. This study investigated the aging potential of the binder and its impact on bond strength. Results showed that aging and addition of reclaimed binder improved bonding strength but limited the bonding enhancement after aging.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
