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Open AccessArticle

Experimental Study on Shear Performance of Cast-In-Place Ultra-High Performance Concrete Structures

by Chuanxi Li 1,2, Zheng Feng 1,2,*, Lu Ke 1,2, Rensheng Pan 1,2,* and Jie Nie 1,2
1
Key Laboratary of Bridge Engineering Safety Control by Department of Education, Changsha University of Science and Technology, Changsha 410114, China
2
School of Civil Engineering, Changsha University of Science and Technology, Changsha 410114, China
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(19), 3254; https://doi.org/10.3390/ma12193254
Received: 23 August 2019 / Revised: 22 September 2019 / Accepted: 3 October 2019 / Published: 5 October 2019
(This article belongs to the Special Issue Advanced Structural Concrete Materials in Bridges)
In order to study the direct shear properties of ultra-high performance concrete (UHPC) structures, 15 Z-shaped monolithic placement specimens (MPSs) and 12 Z-shaped waterjet treated specimens (WJTSs) were tested to study the shear behavior and failure modes. The effects of steel fiber shape, steel fiber volume fraction and interface treatment on the direct shear properties of UHPC were investigated. The test results demonstrate that the MPSs were reinforced with steel fibers and underwent ductile failure. The ultimate load of the MPS is about 166.9% of the initial cracking load. However, the WJTSs failed in a typical brittle mode. Increasing the fiber volume fraction significantly improves the shear strength, which can reach 24.72 MPa. The steel fiber type has little effect on the shear strength and ductility, while increasing the length of steel fibers improves its ductility and slightly reduces the shear strength. The direct shear strength of the WJTSs made from 16 mm hooked-type steel fibers can reach 9.15 MPa, which is 2.47 times the direct shear strength of the specimens without fibers. Finally, an interaction formula for the shear and compressive strength was proposed on the basis of the experimental results, to predict the shear load-carrying capacity of the cast-in-place UHPC structures. View Full-Text
Keywords: ultra-high performance concrete (UHPC); shear property; shear strength; cast-in-place; steel fiber ultra-high performance concrete (UHPC); shear property; shear strength; cast-in-place; steel fiber
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MDPI and ACS Style

Li, C.; Feng, Z.; Ke, L.; Pan, R.; Nie, J. Experimental Study on Shear Performance of Cast-In-Place Ultra-High Performance Concrete Structures. Materials 2019, 12, 3254.

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