Article
Chemistry, Multidisciplinary
Jian Zhou, Jing Li, Guoqiang Liu, Tao Yang, Yongli Zhao
Summary: The study compares the performance of TLA, virgin asphalt binder, and aged asphalt binder, and explores the modification mechanism of TLA on both virgin and aged asphalt. The results show that using hard asphalt binder to recycle aged asphalt and increase RAP content in RHMA is feasible.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Multidisciplinary
Chunli Wu, Liding Li, Wensheng Wang, Zhengwei Gu
Summary: This study investigates the effects of nano-TiO2/CaCO3 on the viscoelastic behaviors of bitumen and bituminous mixtures. The experimental results demonstrate that incorporating nano-TiO2/CaCO3 can improve the temperature sensitivity of bitumen, enhance high-temperature resistance to rutting, and slightly improve low-temperature resistance to cracking.
Article
Construction & Building Technology
Qiran Zhang, Xu Cai, Kuanghuai Wu, Li Chen, Ruida Zhang, Han Xiao, Hafiz Muhammad Zahid Hassan
Summary: The study analyzed the mechanical characteristics of contact interfaces in recycled asphalt mixture, finding that different contact types significantly impacted the shear performance, with the old-old contact type exhibiting the highest tangential elastic stiffness. The results suggest a significant influence of interface contact types on the shear test results.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Andre Kazuo Kuchiishi, Kamilla Vasconcelos, Liedi Legi Bariani Bernucci
Summary: The mechanical behavior of cold recycled asphalt mixtures (CRAMs) is influenced by the composition of the mixture, especially the type and content of bitumen stabilizing agents and active fillers. Triaxial resilient modulus and dynamic modulus tests show that the type and content of these components significantly affect the behavior of the CRAM. Mixtures with cement addition exhibit behavior similar to cementitious materials, while those with hydrated lime behave like granular materials. Dynamic modulus tests also reveal viscoelastic properties and differences between mixtures stabilized with asphalt emulsion and foamed asphalt.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2021)
Article
Construction & Building Technology
Yeongmin Kim, Sangyum Lee
Summary: The purpose of this study is to find and evaluate the optimal mixing ratio of CRAM with DG mineral additives, and to evaluate their mechanical behavior. Through experiments and finite element analysis, it is concluded that CRAM layer should be thicker than BB layer to achieve the same performance.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Sang-Yum Lee, Young-Min Kim, Tri Ho Minh Le
Summary: This study investigates the feasibility of using high penetration asphalt binder (HPAB) as a replacement for conventional rejuvenators in recycled asphalt pavement (RAP) mixture. The results show that HPAB has excellent stress-bearing capacity and dynamic modulus in RAP mixture, and the field test confirms its outstanding performance characteristics.
Article
Chemistry, Physical
Zining Chen, Boying Liu, Decheng Feng, Gang Li
Summary: A study was conducted on the changes in the dynamic modulus and bending stiffness modulus of hot-recycled asphalt mixture with high levels of reclaimed asphalt pavement (RAP) under the influence of different factors. The results showed that the modulus of the recycled asphalt mixture exhibited a decreasing, increasing, and then decreasing trend with increasing dosage of regenerant. The curing time had the greatest impact on the dynamic modulus, followed by the dosage of the regenerant and curing temperature. For bending stiffness modulus, the influence of the dosage of the regenerant was the greatest, followed by curing time and curing temperature. The curing conditions had a greater influence on the bending stiffness modulus compared with the dynamic modulus.
Article
Materials Science, Multidisciplinary
Licheng Guo, Qinsheng Xu, Guodong Zeng, Wenjuan Wu, Min Zhou, Xiangpeng Yan, Xiaomeng Zhang, Jincheng Wei
Summary: The difference in modulus values between the French and Chinese high-modulus asphalt mixture design systems leads to thicker pavement structures and higher construction costs in China. To better meet China's conditions, relationship conversion models between dynamic modulus and complex modulus can be established to recommend suitable dynamic modulus design evaluation value ranges.
Article
Construction & Building Technology
Jiqing Zhu, Abubeker Ahmed, Safwat Said, Yared Dinegdae, Xiaohu Lu
Summary: The use of predictive models improves the evaluation and design processes of asphalt mixture in shear. This study constructs master curves, analyzes test results in Black space and Cole-Cole space, and models the dynamic shear response of asphalt mixtures based on the Hirsch model. Realistic empirical relationships for predicting the phase angle of asphalt mixtures in shear are also proposed.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Construction & Building Technology
Tao Bai, Xuan Huang, Xiaotao Zheng, Hao Wang, Yingxiao Cheng, Bingyan Cui, Fang Xu, Bowen Mao, Yuanyuan Li
Summary: This study conducted dynamic modulus, dynamic resilience modulus, and creep compliance tests to characterize and quantify the effects of viscoelastic parameters of asphalt mixtures on the mechanical response of pavement structures. The results showed that stress magnitude significantly affected the evolution of master curves for parametric conversions from creep compliance and all mechanical responses increased with temperature. The study also demonstrated the importance of interlayer bonding for minimizing compressive/shear stresses and strains in pavement structures to mitigate failure, debonding, delamination, etc. Lastly, the use of modified asphalt mixtures was found critical to mitigate high compressive and shear strains under heavy traffic loading in high temperature climatic conditions.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Nunzio Viscione, Davide Lo Presti, Rosa Veropalumbo, Cristina Oreto, Salvatore Antonio Biancardo, Francesca Russo
Summary: This study proposes a comprehensive characterization of asphalt mixture modified with recycled polymer compound using both wet and dry process, showing significant improvement in performance properties by adding recycled polymer compounds through dry process.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Review
Environmental Sciences
Shobhit Jain, Anush K. K. Chandrappa
Summary: Waste cooking oil (WCO) is being recognized as a potential rejuvenator in the pavement industry to increase the use of reclaimed asphalt (RA). This review article critically examines past and recent studies on the utilization of WCO and RA in asphalt mixtures, providing a comprehensive overview. The review discusses various characteristics related to the use of WCO in RA mixtures, including chemical, rheological, simulation, environmental, and economical findings. While WCO shows promise in enhancing low-to-intermediate temperature performance, challenges arise in moisture damage and higher temperature properties. Future research should focus on understanding different WCOs, optimizing the transesterification process, conducting molecular dynamic simulations, quantifying environmental and economic benefits, and studying field performance.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Construction & Building Technology
Yanqiu Bi, Fucheng Guo, Jiupeng Zhang, Jianzhong Pei, Rui Li
Summary: The study investigates the correlations between asphalt binder/mastic properties and dynamic modulus of asphalt mixture, as well as the influence of various asphalt and aggregate parameters on the dynamic modulus master curve.
Results show that the type of binder and ratio of filler to binder significantly affect the dynamic modulus master curve of asphalt mixture, while the type of gradation, aggregate, and filler have a slight impact.
Among the prediction models, the improved Hirsch model shows the most consistent results, while the M-vertical bar E*vertical bar models predict lower values than measured values, and both models perform well under certain conditions such as dense gradation and appropriate filler-to-binder ratio.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Green & Sustainable Science & Technology
Zifeng Zhao, Feipeng Xiao, Emanuele Toraldo, Maurizio Crispino, Misagh Ketabdari
Summary: This study compares the viscoelastic improvement effect of crumb rubber and reclaimed asphalt pavement on asphalt mixtures. Laboratory tests showed that both crumb rubber and reclaimed asphalt pavement have a positive effect on the elasticity of the asphalt mixture. The elasticity improvement is mainly determined by the reclaimed asphalt pavement, but it also depends on the aged binder content. The effect of incorporating crumb rubber and reclaimed asphalt pavement together is comparable to the sum of the effect when incorporating each of them solely.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Mechanical
Linhao Gu, Weiguang Zhang, Tao Ma, Xiaohua Qiu, Jian Xu
Summary: An innovative procedure was proposed to simulate the viscoelastic mechanical behavior of asphalt mixture, utilizing the fractional Zener model and fitting the storage and loss modulus simultaneously for obtaining model parameters. The effectiveness of the numerical algorithm was verified through relaxation and dynamic modulus tests, demonstrating the applicability of the fractional Zener model in accurately predicting the master curve of storage and loss modulus in a wide frequency or temperature range for asphalt mixture.
JOURNAL OF ENGINEERING MECHANICS
(2021)