In-Plane Strengthening of Unreinforced Concrete Masonry Wallettes Using ECC Shotcrete
Publication: Journal of Structural Engineering
Volume 140, Issue 11
Abstract
An experimental program was conducted to investigate the viability of using engineered cementitious composite (ECC) shotcrete as in-plane shear reinforcement for concrete masonry wallettes. Twenty-six mortared or dry-stacked ungrouted and unreinforced concrete masonry wallettes were strengthened through the application of an ECC shotcrete mix, applied either by spraying with a shotcrete machine or by hand trowelling. To determine the effect of applicator experience, ECC was applied by both a professional plasterer and amateur plasterers, with and without supervision. The in-plane shear strength of the strengthened wallettes increased between 340 and 3,471%, depending on the ECC application method. The variability of the strength increase was smaller for wallettes that had mortared joints and an ECC overlay trowelled by a professional plasterer. A set of design equations was also developed to determine the shear strength of a strengthened wallette. The design displacement ductility can be conservatively set equal to 1.9 because of the high variability in the experimentally obtained ductility values.
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Acknowledgments
The authors thank Derek Lawley, David Nevans, Richard Leary, Michael Barry, Gareth Williams, and Mason Pirie from Reid Construction Systems for the funding and assistance in providing the ECC shotcrete mix material and related equipment, Matt Pronk from Vijay Frame & Truss for providing the space for the wallette specimens, and Bob Fleming from Fleming Plasterers and Reinstatements for the ECC application. The authors also thank Anthony Le Dain, Bing Zhang, and Karl Yuan for their assistance in ECC application and testing the wallette samples. Lastly, the authors thank the New Zealand Ministry of Science and Innovation for the funding of Yi-Wei Lin’s doctoral study and thank the New Zealand Earthquake Commission for the funding of Dr. Wotherspoon’s position at the University of Auckland.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 140 • Issue 11 • November 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Feb 24, 2013
Accepted: Nov 13, 2013
Published online: May 19, 2014
Discussion open until: Oct 19, 2014
Published in print: Nov 1, 2014
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