scholarly journals Effect of confining pressure on shear resistance of ultra-high-performance fiber reinforced concrete

2020 ◽  
Vol 14 (2) ◽  
pp. 108-115
Author(s):  
Ngo Tri Thuong
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
High Performance ◽  
Steel Fiber ◽  
Confining Pressure ◽  
Shear Resistance ◽  
Fiber Reinforced Concrete ◽  
Test Method ◽  
Fiber Reinforced ◽  
High Performance Fiber

Effect of confining pressure on the shear resistance of ultra-high-performance fiber-reinforced concrete (UHPFRCs), containing 1.5% volume content (1.5 vol.-%) of short smooth steel fiber (SS, l = 13, d = 0.2 mm) and long smooth steel fiber (LS, l = 30, d = 0.3 mm), was investigated using a new shear test method. Three levels of confining pressure were generated and maintained to the longitudinal axis of the specimen prior shear loading was applied. The test results exhibited that the shear strength of UHPFRCs was obviously sensitive to the confining pressure: the higher confining pressure produced higher shear strength. UHPFRC reinforced with 1.5 vol.-% long smooth steel fiber exhibited higher shear resistance than those reinforced with short smooth steel fiber, regardless of confining pressure levels. The confined shear strength could be expressed as an empirical function of unconfined shear strength, confining pressure, and tensile strength of UHPFRCs. Keywords: UHPFRCs, shear resistance; confining pressure effect; smooth fiber.

scholarly journals Shear resistance of ultra-high-performance concrete reinforced with hybrid steel fiber subjected to impact loading

2019 ◽  
Vol 13 (1) ◽  
pp. 12-20 ◽  
Author(s):  
Pham Thai Hoan ◽  
Ngo Tri Thuong
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Steel Fiber ◽  
High Strain ◽  
Shear Resistance ◽  
Short Fiber ◽  
Fiber Reinforced Concrete ◽  
Strain Rates ◽  
Fiber Reinforced ◽  
High Strain Rates

This study investigated the synergy in shear response of ultra-high-performance fiber-reinforced concrete (UHPFRCs) containing different contents of long and short smooth steel fiber reinforcements at high strain rates. Shear resistance of two ultra-high-performance mono-fiber-reinforced concrete (UHP-MFRCs): L15S00 (containing 1.5 vol.-% long and 0.0 vol.-% short fiber) or L00S15, and one ultra-high-performance hybrid-fiber-reinforced concrete (UHP-HFRCs): L10S05 (containing 1.0 vol.-% long and 0.5 vol.-% short fiber) at high strain rates of up to 272 s-1 was investigated using a new shear test setup by an improved strain energy frame impact machine (I-SEFIM). The L10S05 generated high synergy in shear strength, shear peak toughness at static rate and high synergy in shear strain, shear peak toughness at high strain rates. Moreover, all the investigated UHPFRCs were sensitive to the applied strain rates, especially in term of shear strength. Keywords: UHPFRCs; shear resistance; synergy effect; strain-rate dependent; impact. Received 23 August 2018, Revised 29 September 2018, Accepted 18 December 2018

Shear Strength of Dry and Epoxy Joints for Ultra-High-Performance Fiber-Reinforced Concrete

2020 ◽  
Vol 117 (1) ◽  
Author(s):  
Balamurugan A. Gopal ◽  
Farzad Hejazi ◽  
Milad Hafezolghorani ◽  
Yen Lei Voo
Keyword(s):  
Shear Strength ◽  
Reinforced Concrete ◽  
High Performance ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
High Performance Fiber
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