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
Green & Sustainable Science & Technology
Nathanyawat Sedthayutthaphong, Peerapong Jitsangiam, Hamid Nikraz, Suriyavut Pra-ai, Sarintip Tantanee, Korakod Nusit
Summary: The study investigated the effects of aged asphalt and aged aggregates on the skid resistance of recycled hot mix asphalt, finding that the aggregate gradations controlled the characteristics of the final skid resistance.
Article
Green & Sustainable Science & Technology
Yining Zhang, Hengjin Chen, Kezhong Wang, Guodeng Huang, Zhubin Shen, Lijun Sun
Summary: The application of recycled asphalt pavement (RAP) can bring significant economic and environmental benefits. However, the impact of RAP gradations on the blending and performance of recycled hot mix asphalt (HMA) has not been fully considered. This study aimed to investigate the effects of recycled aggregate gradation on the degree of blending and performance of recycled HMAs. The results showed that the addition of finer particles of RAP activated more RAP binder, increasing the degree of blending in the recycled HMAs. However, the water stability and thermal cracking performance of recycled HMAs containing fine particles of RAP were still inferior to those containing coarse particles of RAP, possibly due to the unfavorable distribution of RAP binder in these mixtures.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Green & Sustainable Science & Technology
Teng Wang, Xianwu Ling, Jun Lin, Bing Xiang, Dongdong Yuan, Wentong Wang, Di Wang, Dedong Guo
Summary: It is found that blending behavior is the main factor affecting the actual and design performance of hot recycled asphalt mixtures. The component changes of asphalt mixtures were studied using thin-layer chromatography and flame ionization detection to understand the mechanism of asphalt aging and recycling. Based on the difference in recycled asphalt components, the hot recycled asphalt mixtures were optimized using the Marshall design method. The laboratory tests show that increasing the degree of blending improves the performance of hot recycled asphalt mixtures in terms of high-temperature stability, low-temperature crack resistance, water stability, and fatigue performance.
Article
Green & Sustainable Science & Technology
Yining Zhang, Wenkai Zhu, Xiaolong Chu, Haidong Dong, Dong Liu, Yanyan Liu, Hengjin Chen, Huailei Cheng, Lijun Sun
Summary: This research investigated the impact of design parameters on the performance of recycled hot-mix asphalt (HMA) containing fine reclaimed asphalt pavement (RAP) particles. It was found that adjusting the preheating temperature, compaction effort, asphalt content, and blending duration can improve the rheological performance of the recycled HMA. Additionally, incorporating fine RAP particles in the design can reduce energy consumption and CO2 emissions.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Construction & Building Technology
Dai Xuan Lu, Marie Enfrin, Yeong Jia Boom, Filippo Giustozzi
Summary: The recyclability of reclaimed asphalt pavement (RAP) from conventional asphalt concrete has been extensively studied. However, there is still uncertainty about the recyclability of plastic-modified asphalt at the end of its service life (P-RAP). This is mainly due to the lack of aged P-RAP material from the field, indicating that the use of recycled plastics in asphalt is still in the research phase. This study aims to evaluate the future recyclability of P-RAP and found that it can be fully recycled and provides similar performance to standard RAP mixes.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Van Phuc Le
Summary: This paper evaluates the performance characteristics of asphalt binder modified with sugarcane waste molasses in AC mixtures, finding that SWM modified binder can significantly improve rutting resistance and moisture damage resistance. An optimum SWM content of 10% by base asphalt weight is recommended for use as an alternative to base binder in Hot Mix Asphalt.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2021)
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
Xingyu Yi, Huimin Chen, Yiik Diew Wong, Jun Yang, Wei Huang
Summary: The reutilization of reclaimed asphalt pavement (RAP) is important for sustainable environmental policies. This study investigated the effects of epoxy polymer (EP) content on the properties of recycled asphalt binder. The addition of EP significantly enhanced the strength and resistance of the binder but reduced its elongation.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Bao Li, Ning Li, Xin Yu, Jianguang Xie, He Zhan, Jian Ding, Hui Ma
Summary: The aging performance and durability of foamed warm mix asphalt (FWMA) have not been fully studied. This study examined and evaluated the performance variation of FWMA compared to conventional hot mix asphalt (HMA) under long-term service conditions. The results showed that the aging resistance of FWMA was slightly diminished under construction conditions with no temperature reduction, but improved at high temperatures and deteriorated at low temperatures with increased service time. The foaming water and service time were primary determinants of the aging and rheological properties of FWMA.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Xiangdao Hou, Chamod Hettiarachchi, Feipeng Xiao, Zifeng Zhao, Qian Xiang, Dara Yong
Summary: The application of reclaimed asphalt pavement (RAP) materials has become an important topic in sustainable road construction. Low carbon asphalt technology, such as warm mix technology, is utilized to reduce energy consumption and emissions in RAP application. Factors like blending time, temperature, and RAP content influence the blending efficiency of recycled asphalt mixtures.
JOURNAL OF CLEANER PRODUCTION
(2021)
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
Chemistry, Physical
Tameem Mohammed Hashim, Mohammed Salah Nasr, Yasir Mohammed Jebur, Abdullah Kadhim, Zainab Alkhafaji, Mirza Ghouse Baig, Saheed Kolawole Adekunle, Mohammed A. A. Al-Osta, Shamsad Ahmad, Zaher Mundher Yaseen
Summary: Growing environmental pollution worldwide is mainly caused by the accumulation of liquid and solid waste. Developed countries support waste recycling policies due to their significant impact on the environment. Hot-mix asphalt mixtures (HMA) with reclaimed asphalt pavement (RAP) show excellent performance in resisting rutting. However, using a high percentage of RAP (>25%) poses a challenge due to increased stiffness. This study explores the use of various commercial and noncommercial rejuvenators to address the stiffness issue and optimize the performance of RAP mixtures in different proportions.
Article
Green & Sustainable Science & Technology
Sonja Ellen Pape, Cassie Castorena
Summary: The preheating procedures in the laboratory have a significant impact on the contribution of recycled binder to the asphalt mixture. The study found that preheating methods without superheating can yield similar recycled binder contribution results compared to superheating methods, while mixtures with recycled asphalt shingles are more sensitive to preheating procedures.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Construction & Building Technology
Matheus Silva Oliveira, Marcio Muniz de Farias, Joao Paulo Souza Silva
Summary: Asphalt coatings are widely used in paving services in Brazil due to the availability of material and the suitability of the technique. This research aimed to evaluate the fatigue life of hot recycled asphalt mixtures with the incorporation of reclaimed asphalt pavement (RAP) at different proportions. The results indicated that the mixtures performed well, with higher incorporations of RAP leading to shorter fatigue lives. Overall, the study proved the feasibility of using this technique in paving works.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Construction & Building Technology
Milad Zokaei Ashtiani, Stephen T. Muench, David Gent, Jeffrey S. Uhlmeyer
CONSTRUCTION AND BUILDING MATERIALS
(2019)
Article
Engineering, Civil
Ryan Howell, Stephen Muench, James Feracor, Milad Ashtiani, Jim Weston
JOURNAL OF TRANSPORTATION ENGINEERING PART B-PAVEMENTS
(2020)
Article
Construction & Building Technology
Milad Zokaei Ashtiani, Walaa S. Mogawer, Nader Tabatabaee
Summary: This study investigated the blending of aged asphalt binder in reclaimed asphalt pavement (RAP) or recycled asphalt shingles (RAS) blends with virgin binder. The master curves for the asphalt mixtures and asphalt binder blends were constructed, showing that the degree of blending occurred at 50%-60% for RAP and 15%-30% for RAS.
ROAD MATERIALS AND PAVEMENT DESIGN
(2022)
Article
Green & Sustainable Science & Technology
Milad Zokaei Ashtiani, Stephen T. Muench
Summary: This study introduces 12 sustainable performance metrics for roadway construction and establishes benchmarks using data from 33 projects. The research reveals that paving materials are the largest contributors to greenhouse gas emissions and energy consumption, and that it is possible to predict these emissions and consumption based solely on project price.
JOURNAL OF CLEANER PRODUCTION
(2022)
Proceedings Paper
Engineering, Civil
Ryan Howell, Stephen Muench, James Feracor, Milad Ashtiani, Jim Weston
AIRFIELD AND HIGHWAY PAVEMENTS 2019: DESIGN, CONSTRUCTION, CONDITION EVALUATION, AND MANAGEMENT OF PAVEMENTS
(2019)