Impact Resistance of Polyurea-Coated High-Performance Cementitious Composites
Publication: Journal of Materials in Civil Engineering
Volume 25, Issue 12
Abstract
Polyurea is a polymeric material that can be used to provide environmental protection and structural enhancement. In this study, a low modulus polyurea coating, having high elongation, high energy absorption capacities, and a fast gel time, was sprayed under field conditions onto the surfaces of high-performance cementitious composites (). Flexure tests were conducted to measure toughness so that predictions could be made regarding the impact performance of two uncoated and coated matrices, one containing polyvinyl butyral (PVB) as the only aggregate, the other with polyvinyl alcohol (PVA) fibers added for reinforcement. Results from the flexure tests showed that encapsulation by plain polyurea increased the flexural strength of specimens by at least 60%. Results from drop-weight tests showed that the PVA fibers helped to improve impact resistance. A visible reduction in damage was seen when polyurea was applied to one surface, more so by coating the tension side opposite the striker. Coating both surfaces further increased impact resistance.
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Acknowledgments
The authors would like to thank the U.S. Department of Commerce for supporting this research under National Oceanic and Atmospheric Administration (NOAA) Small Business Innovation Research (SBIR) contract number WC133R-09-CN-0108. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the authors and do not necessarily reflect the views of the Department of Commerce.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 25 • Issue 12 • December 2013
Pages: 1984 - 1989
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Oct 1, 2012
Accepted: Oct 11, 2012
Published online: Oct 13, 2012
Discussion open until: Mar 13, 2013
Published in print: Dec 1, 2013
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