Temperature Sensing and Hydration Study of Carbon Nanofiber Aggregates
Publication: Journal of Aerospace Engineering
Volume 33, Issue 2
Abstract
Fiber research in concrete construction technology has been helping to prevent catastrophic disasters due to the loss of structural integrity and service life by functioning as structural health monitoring (SHM) technology. Past studies demonstrated the use of self-consolidating carbon nanofiber concrete (SCCNFC) as a structural sensor, which led to the development of carbon nanofiber aggregates (CNFAs) to be used as strain sensors to determine localized strains in concrete structures. This paper examines the effect of temperature and hydration on CNFAs. In the temperature study, the specimens containing CNFA were monitored for temperature sensing capability through one complete cooling and heating cycle ( to 90°C), giving the mathematical model to predict the thermal behavior of CNFAs used to monitor the temperature of embedded structures. In the hydration study of CNFAs, this paper critically examines the effect of water on the electrical resistance of CNFAs and demonstrates the necessity of the waterproof coating in embedded CNFAs for reliable SHM.
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Data Availability Statement
Some or all data, models, or code generated or used during the study are available from the corresponding author by request for the following items:
1.
Temperature versus ERV for Six Embedded CNFAs and Their Average
2.
ERV versus Time for Groups A and B with SAC Waterproof Coating
3.
ERV versus Time for Groups C and D with SAC Waterproof Coating
4.
ERV versus Time for Groups E and F with SAC Waterproof Coating
5.
ERV versus Time for Groups G and H with SAC Waterproof Coating
6.
Resistance versus Time for Groups E and G
7.
Follow-Up Experiment ERV and Temperature versus Time
Acknowledgments
This material is based upon work supported by the National Science Foundation under Grant 0634279. Opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.
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Published In
Journal of Aerospace Engineering
Volume 33 • Issue 2 • March 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Feb 5, 2018
Accepted: Sep 13, 2019
Published online: Jan 13, 2020
Published in print: Mar 1, 2020
Discussion open until: Jun 13, 2020
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