Determination of Virgin Asphalt Mixture Content in Hot In-Place Recycling Based on Field Rutting Depth Variability
Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 8
Abstract
Hot in-place recycling (HIR) technology, 100% recycling reclaimed asphalt pavement (RAP), has been widely used as a sustainable maintenance treatment. However, the inhomogeneity of RAP makes it impossible to securely assume that the produced mixture properties will match the laboratory design. For HIR projects, a virgin asphalt mixture (VAM) is added to modify the gradation of the existing rutted pavement. However, once the quantities of VAM added to areas of rutting are varied along the driving direction, the desired construction quality cannot be maintained. In this paper, a method to estimate the quantities of VAM needed for areas with rutting along the driving direction is proposed. To verify the feasibility of the proposed method and explore the effects of varying VAM content caused by rutting depth (RD) distribution variation on construction quality, performance tests of all samples, including two gradation types of virgin aggregates and five VAM contents, were conducted in the laboratory. Test results indicate that the pavement performance of the recycled mixture with continuously graded virgin aggregates is more stable due to the similar gradation of RAP, while the performance of the recycled mixture with gap-graded virgin aggregates possesses substantial fluctuation. Specifically, when the required VAM content is lower than 15%, namely, all monitored RDs less than 10 mm, gap-graded virgin aggregates are more highly recommended from a high-temperature stability perspective. When the required VAM content ranges from 10% to 15%, namely, all monitored RDs ranging from 5.9 to 10 mm, the continuously graded virgin aggregates should be considered first with respect to low-temperature performance. To improve moisture susceptibility, the continuously graded virgin aggregates are more appropriate.
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Data Availability Statement
All data, models, and code generated or used during the study are presented in the published article.
Acknowledgments
This work was supported by the National Key Research and Development Program of China (2018YF-B1600200), the National Natural Science Foundation of China (No. 52078132), the Research on the Key Technology of Hot In-place Recycling for Rubber Asphalt Pavements (BY2015070-04), the Fundamental Research Funds for the Central Universities (2242021Y10063, 2242021Y10329), and the Scientific Research Foundation of Graduate School of Southeast University (YBYP2168). The authors gratefully acknowledge their financial support. Furthermore, all authors of the following references are much appreciated.
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Published In
Journal of Materials in Civil Engineering
Volume 35 • Issue 8 • August 2023
Copyright
© 2023 American Society of Civil Engineers.
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Received: Aug 1, 2022
Accepted: Dec 23, 2022
Published online: May 25, 2023
Published in print: Aug 1, 2023
Discussion open until: Oct 25, 2023
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