Permanent Deformation Behavior of Foamed Bitumen Stabilized Mixes
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 7
Abstract
This paper investigated the deformation (dynamic creep) behavior of foamed bitumen stabilized mixes (BSM-foam) that incorporates recycled asphalt pavement (RAP) material. The influence of temperature and stress level on the deformation behavior of these mixes was studied. The permanent deformation indicators that were determined using the laboratory tests on BSM were also compared with those of the conventional hot mix asphalt (HMA). From the comparative studies using dynamic creep tests, it was noted that the three-stages (primary, secondary and tertiary) of the creep curve that are usually seen for HMA were also observed for BSMs. The mathematical models that are commonly used to fit the different stages of the creep curve of HMA were found to be applicable to predict the creep behavior of the BSMs. In general, it was found that the BSMs behave similarly to that of HMA in terms of permanent deformation in that a steady-state strain rate was achieved before failure. From the repeated load axial test (RLAT) tests, it was noticed that the BSMs are less temperature-sensitive to deformation compared to HMAs. BSMs showed 20%–45% less of an increase in permanent deformation compared to HMA when test temperature increased from 30°C to 50°C. This study also investigated the applicability of the time-temperature superposition (TTS) principle for secondary stage permanent strain data obtained from RLAT tests. The RLAT tests were conducted at three temperatures and three stress levels to develop the dynamic creep master curve. It was observed that the TTS principle is applicable for secondary creep data of BSMs.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 7 • July 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Sep 24, 2020
Accepted: Nov 16, 2020
Published online: Apr 27, 2021
Published in print: Jul 1, 2021
Discussion open until: Sep 27, 2021
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