Tensile Properties of an Engineered Cementitious Composite Shotcrete Mix
Publication: Journal of Materials in Civil Engineering
Volume 27, Issue 7
Abstract
Results are presented for a series of laboratory tests that were undertaken to characterize the tensile properties of an engineered cementitious composite (ECC) mix, which is a mortar-based composite reinforced with synthetic fibers to provide tensile strain–hardening characteristics. Dogbone-, rectangular-, and circular-bar-shaped specimens were developed to determine the most suitable specimen geometry for uniaxial tensile testing (UTT), with the circular-bar specimens that were constructed by coring through sprayed ECC panels showing the best geometrical consistency, both within each specimen and between individual specimens. Fifty circular-bar specimens with a diameter of 16 mm and a length of 200 mm were tested under uniaxial tension to determine the characteristic tensile properties. Statistical distributions were used to define a 5% characteristic tensile yield strength of 1.82 MPa and a 10% tensile total strain of 0.08%. A material ductility factor of 4.0 was determined, and factors are proposed to convert quality assurance test mean values to characteristic values.
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Acknowledgments
The authors wish to acknowledge Royce Finlayson, Michael Ryan, Bing Zhang, Karl Yuan, and Anthony Le Dain for their assistance in sample production, preparation, and testing. The authors would also like to thank Derek Lawley, David Nevans, Michael Barry, and Roydon Gilmour from Reid Construction Systems for providing some of the equipment required for this study. Last, the authors would like to acknowledge the financial support of The New Zealand Ministry of Science and Innovation and the New Zealand Earthquake Commission.
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Published In
Journal of Materials in Civil Engineering
Volume 27 • Issue 7 • July 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Feb 20, 2013
Accepted: Jul 17, 2014
Published online: Sep 2, 2014
Discussion open until: Feb 2, 2015
Published in print: Jul 1, 2015
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