Shear Capacity of Ultrahigh-Performance Concrete with Monolithic Interface and Wet-Joint Interface
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 7
Abstract
A total of 65 Z-shaped ultrahigh-performance concrete (UHPC) specimens with monolithic interfaces, flat-wet-joint interfaces (roughened with a high-pressure water jet), and keyed-wet-joint interfaces were tested under the classical push-off test setup. The influences of steel fiber properties, keyed-joint shapes, and confining stress on the shear strength of the UHPC specimens are discussed. A high-precision equation for predicting the shear capacity of the UHPC specimens with monolithic interfaces, flat-wet-joint interfaces, and keyed-wet-joint interfaces is proposed and verified by experimental results. The test results indicate that steel fibers had a significantly positive effect on improving the shear strength of the UHPC specimens. For the flat-wet-joint specimens, the shear strength increased approximately linearly as the fiber content increased. Using long and hooked-end fibers improved its shear strength. For the keyed-wet-joint specimens, the shear strength improved almost linearly with confining stress, whereas the keyed-joint shape had little influence. The strength reduction factor (the ratio of the ultimate shear strength of the flat-wet-joint interface to that of the monolithic interface) increased with the fiber volume fraction. A relationship between the strength reduction factor and the fiber characteristic parameter is proposed.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This research is supported by the National Natural Science Foundation Project of China (Grant Nos. 52078059, 51778069, 51978081, and 51808055), the Horizon 2020-Marie Skłodowska-Curie Individual Fellowship of European Commission (REUSE) (793787), and the Natural Science Foundation of Hunan Province, China (Grant No. 2021JJ30712). In addition, the financial support from the China Scholarship Council (CSC) to the first author is gratefully acknowledged.
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 7 • July 2022
Copyright
© 2022 American Society of Civil Engineers.
History
Received: Aug 16, 2021
Accepted: Nov 22, 2021
Published online: Apr 28, 2022
Published in print: Jul 1, 2022
Discussion open until: Sep 28, 2022
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