Shear Capacity of Ultrahigh-Performance Concrete with Monolithic Interface and Wet-Joint Interface

Zheng Feng, Chuanxi Li, Rensheng Pan, Doo Yeol Yoo, Jun He, Lu Ke

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish
Article number04022153
JournalJournal of Materials in Civil Engineering
Issue number7
Publication statusPublished - 2022 Jul 1

Bibliographical note

Funding Information:
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.

Publisher Copyright:
© 2022 American Society of Civil Engineers.

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)
  • Mechanics of Materials


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