Permeation and Transport Properties of Self-Healed Cementitious Composite Produced with MgO Expansive Agent
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 11
Abstract
This study evaluated the self-healing capability of engineered cementitious composite (ECC) produced with 5% MgO expansive agent (MEA) compared with standard ECC counterparts. The efficiency of the proposed ECC-MgO self-healing system was studied based on the rapid chloride ion permeability (RCP) and sorptivity behaviors of the virgin and cracked specimens when exposed to water, natural, and autoclave curing conditions for different durations. Test results indicated better resistance to chloride ion penetration in addition to significant reduction in sorptivity indexes (considered as measures of self-healing capability) for water- and natural-cured preloaded cracked ECC-MgO specimens compared with their ECC counterparts. The higher self-healing ability of ECC-MgO system was attributed to the formation of healing compounds within the crack walls due to the delayed MEA hydration, as confirmed from microstructural characterization based on scanning electron microscopic (SEM) analyses. The study revealed the potential of using the self-healing ECC-MgO system as sustainable and durable material for infrastructure applications.
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Acknowledgments
The authors gratefully acknowledge the financial support provided by the Natural Science and Engineering Research Council (NSERC), Canada.
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Published In
Journal of Materials in Civil Engineering
Volume 30 • Issue 11 • November 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Oct 19, 2017
Accepted: Apr 17, 2018
Published online: Aug 23, 2018
Published in print: Nov 1, 2018
Discussion open until: Jan 23, 2019
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