Self-Healing of SMA and Steel-Reinforced Mortar with Microcapsules
Publication: Journal of Materials in Civil Engineering
Volume 31, Issue 2
Abstract
Healing capabilities of shape-memory alloys (SMAs) and steel-reinforced mortar with self-healing microcapsules were investigated. Small cracks ranging from 13 to 152 μm were induced by three-point bending, and specimens were subjected to a 14-day healing period under water-submerged conditions at to induce shape-memory effect activation. Light microscopy investigation was performed at 3, 7, and 14 days of the healing period. Moreover, healing products were investigated using scanning electron microscopy (SEM) and energy-dispersive spectroscopy (EDS). Healing efficiency improvements with the increase in microcapsule content were reported at 3 and 7 days for steel-reinforced specimens. Furthermore, for all mortar mixes evaluated, SMA-reinforced specimens exhibited a superior healing performance than steel-reinforced specimens at 3 days of healing due the crack-closing action of SMA. The overwhelming majority of healing products were identified as likely calcite crystals, and the limited gellike products also present were presumably calcium silicate hydrate (C─ S─ H).
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Acknowledgments
The authors would like to acknowledge the financial support through a grant from Qatar National Research Foundation (QNRF)/National Priorities Research Program (NPRP) as well as the laboratory support from Louisiana Transportation Research Center (LTRC).
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Published In
Journal of Materials in Civil Engineering
Volume 31 • Issue 2 • February 2019
Copyright
©2018 American Society of Civil Engineers.
History
Received: Nov 15, 2017
Accepted: Jul 17, 2018
Published online: Nov 20, 2018
Published in print: Feb 1, 2019
Discussion open until: Apr 20, 2019
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