Surface Swelling Characteristics in Concrete under Salt Frost Exposure
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 3
Abstract
Salt scaling is a commonly observed durability issue in concrete exposed to a combined salt and frost attack. This damage is restricted to a very thin surface region causing the removal of mortar flakes. This study demonstrates the surface-swelling characteristics of different concrete mixes. Significant paste swelling of the embedded fine silica sand peripherally occurs around the coarse aggregate particles in concrete mixes having a high water/cement ratio or insufficient air entrainment. Localized scaling is observed in concrete mixes with a denser matrix. The severity of this phenomenon is related to the magnitude of cryogenic suction governed by the permeability of the paste. Surface scaling is proposed to be the generator of bulging stress due to confined expansion from ice growth.
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Data Availability Statement
All data, models, and codes generated or used during the study appear in the published article.
Acknowledgments
This work was supported by the National Key Research and Development Program of China (2017YFB0310001), National Natural Science Foundation of China (51702242), and Hubei Technology Innovation Key Program (2018AAA004).
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Published In
Journal of Materials in Civil Engineering
Volume 32 • Issue 3 • March 2020
Copyright
©2020 American Society of Civil Engineers.
History
Received: Apr 26, 2019
Accepted: Aug 26, 2019
Published online: Jan 9, 2020
Published in print: Mar 1, 2020
Discussion open until: Jun 9, 2020
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