Investigation of the Shear Behavior between Layers of Foamed Asphalt Cold-Recycled Pavement
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 4
Abstract
Foamed asphalt cold-recycled mixtures have been increasingly used in China. However, the interlayer shear performance between the foamed asphalt cold-recycled layer and its top and bottom layers is still not clear. In this study, we explored factors affecting the interlayer shear performance of foamed asphalt cold-recycled layers (FACRL). Regarding the interlayer performance between the foamed asphalt cold-recycled layer and cement-treated base (CTB), the optimal content of the prime coat asphalt was , and the prime coat asphalt was recommended to be applied on the surface of the base as soon as the base was paved. Styrene-butadiene-styrene (SBS)-rubber modified asphalt with a content of and aggregates with a size range of was recommended for use in the seal coats. The aggregates used in the seal coat were recommended to be premixed with a 0.3% asphalt binder to improve the adhesion and to be paved with a spreading area of 65%. Regarding the interlayer performance between the foamed asphalt cold-recycled layer and top hot-mix asphalt (HMA), the interlayer shear strength and fracture energy increased and then decreased with the added tack coat asphalt. The shear strength and fracture energy of the interlayer at 50°C was only 20% and 8% of that at 25°C, respectively. The optimum usage percent of the tack coat binder is .
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This work is financially supported by the National Natural Science Foundation of China (No. 51878229) and the Transportation Science and Technology Project of Jilin Province (2017ZDGC-2-6, 2017ZDGC-2-2).
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 4 • April 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: May 11, 2020
Accepted: Sep 8, 2020
Published online: Feb 1, 2021
Published in print: Apr 1, 2021
Discussion open until: Jul 1, 2021
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