Impact of Nonlinear Elastic Behavior of Foamed Asphalt Stabilized Mixes on Pavement Structural Performance
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 10
Abstract
The mechanical behavior of cold recycled asphalt mixtures (CRAM) is influenced by its composition and limited studies have focused on exploration of nonlinear elastic behavior of CRAM. This study evaluates the effect of the nonlinear elastic properties of a CRAM as base course material on pavement structure using KENLAYER and multilayered elastic analysis (análise elástica de múltiplas camadas, or AEMC) simulations. The results indicate that the pavement structure and the active filler type have significant impact on the deflection and stresses within the pavement structure. Besides, considering the CRAM as nonlinear elastic material reduces the horizontal strains within the CRAM layer and the vertical stresses on top of the underlying layer as compared to the linear elastic scenario. Pezo’s model better characterizes the CRAM’s nonlinear elastic behavior compared to other models. Even though a small correspondence was observed between model predicted strain values and in situ measured data, the present study suggests that the higher bearing capacity of the CRAM layer in the nonlinear elastic scenario can lead to an improved pavement load capacity with a thinner structure resulting in lower construction costs.
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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 study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Brasil (CAPES)—Finance Code 001 (Grant No. 33002010055P-9), by Conselho Nacional de Desenvolvimento Científico e Tecnológico (Grant Nos. 309591/2016-3 and 311256/2016-3) and by Agência Nacional de Transportes Terrestres (RDT-FD-7). The authors would also like to acknowledge Copavel Consultoria e Engenharia Ltd. for the availability of the vibratory compactor equipment and foaming machine, and Arteris for the materials used in this study, the construction of the experimental test section, and the assistance with the strain gauges installation and data acquisition.
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 10 • October 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Oct 2, 2020
Accepted: Mar 4, 2021
Published online: Jul 21, 2021
Published in print: Oct 1, 2021
Discussion open until: Dec 21, 2021
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Cited by
- Decai Wang, Haolei Chang, Yingchun Cai, Shi Dong, Qunlei Zhang, Jingjiang Wu, Yong Zhang, Performance and assessment of modified cold recycled asphalt emulsion mixture, Road Materials and Pavement Design, 10.1080/14680629.2022.2148183, (1-23), (2022).