Nano-microscopic analysis on the interaction of new and old asphalt mortar in recycled asphalt mixture

Zhao, Song; Zhang, Haitao; Gao, Meiyi; Zhang, Qianhui; Sun, Qi; Dong, Qingjie

doi:10.1016/j.cplett.2023.140593

Cited by 6 publications

(2 citation statements)

References 21 publications

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“…Domestic and foreign scholars have conducted extensive research on how to interpret the DOF of blended asphalt in recycled mixtures from different perspectives. Song Zhao et al [23] employed molecular dynamics simulation software to reveal the interplay between aged and fresh asphalt mortars in recycled mixture from a microscopic perspective. Shisong Ren et al [24] used the thermal stability of recycled asphalt in the laboratory to verify the effectiveness of a molecular dynamics model in predicting the compatibility of a regenerated agent with aging asphalt, and explained the compatibility and stability of a regenerated agent with aging asphalt from a molecular perspective.…”

Section: Introductionmentioning

confidence: 99%

The Early Performance Development of Hot In-Place Recycled Asphalt Mixture

Shi,

Liu,

Xue

et al. 2024

Coatings

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With increasing societal attention being directed to resource and environment problems, the research focus on high reclaimed asphalt content mixtures has become pertinent. The degree of asphalt fusion in the thermal regeneration process of a high RAP content reclaimed asphalt mixture has a great influence on its performance. In order to explore the development process of hot in-place recycling mixture performance along with internal asphalt fusion, this study conducted research on a geothermal regeneration mixture with 80% RAP content. Dynamic shear rheology (DSR), infrared spectroscopy, and scanning electron microscopy were used to investigate the fusion of recycled mixture under different placement times (1 day, 4 days, and 7 days), and the road performance and fatigue life of the recycled mixture under different placement times were then studied. The results showed that the fusion degree of old asphalt and new asphalt in a recycled asphalt mixture reached 100%, and gradually increased with the extension of placement time. With the increase in placement time, the high temperature performance of the regenerated mixture gradually decreased, the water stability gradually increased, and the low-temperature performance and fatigue life significantly increased from 1 day to 7 days, by 19% and 32%, respectively.

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Section: Introductionmentioning

confidence: 99%

The Early Performance Development of Hot In-Place Recycled Asphalt Mixture

Shi,

Liu,

Xue

et al. 2024

Coatings

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“…Over the years, several innovative technologies have emerged to enhance the utilization of RAP materials and improve the overall performance of recycled asphalt [6][7][8]. One notable technology is the use of warm-mix asphalt (WMA) additives in RAP mixtures [9].…”

Section: Introductionmentioning

confidence: 99%

Feasibility and Sustainable Performance of RAP Mixtures with Low-Viscosity Binder and Castor Wax–Corn Oil Rejuvenators

Kim

2023

Buildings

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The utilization of Recycled Asphalt Pavement (RAP) mixtures in pavement construction is an environmentally friendly approach that promotes sustainable development by reducing energy consumption and material waste. However, the high cost of conventional rejuvenators limits the widespread use of RAP mixtures. In this study, a novel approach is proposed to enhance the performance of RAP mixtures by incorporating a combination of high-penetration asphalt binder and rejuvenators, namely Castor wax and Corn oil. The newly developed rejuvenator consists of 8.5% Castor wax oil, 3% Corn oil, 3% fatty acid amine surfactant, 0.2% additive, and 79.8% water. The test results demonstrate that the modified mixture exhibits superior properties compared with conventional RAP mixtures. The Multiple Stress Creep Recovery test results showed a 20% reduction in cumulative strain rate for the RAP mixture with the new rejuvenators compared with that for the conventional ones. Furthermore, the Tensile Strength Ratio test indicated a notable 9.47% improvement in the rejuvenated RAP mixture’s resistance to moisture-induced damage compared with the conventional mixture. Evaluation of viscoelastic behaviors revealed a slight reduction in dynamic modulus for the rejuvenated binder, but a significant improvement in elastic behavior. In terms of rutting resistance, the Hamburg wheel tracking rut depths of the rejuvenated binder were significantly lower, representing reductions of 21.83% for specific binder compositions. Additionally, the absence of the stripping phenomenon further confirmed the superior moisture resistance of the modified mixture. The rejuvenated binder exhibited a remarkable 28.55% increase in fatigue load cycles to failure compared with the reference RAP binder, demonstrating substantial resistance to fatigue cracking. These quantitative comparisons not only confirm the superior performance of the modified mixture over conventional RAP mixtures, but also highlight the potential cost savings achieved through the utilization of Castor wax and Corn oil rejuvenators.

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