Exploratory study of ultra-high performance fiber reinforced concrete tunnel lining segments with varying steel fiber lengths and dosages

2015 ◽  
Vol 101 ◽  
pp. 733-742 ◽  
Author(s):  
Moncef L. Nehdi ◽  
Safeer Abbas ◽  
Ahmed M. Soliman
Keyword(s):  
Reinforced Concrete ◽  
Exploratory Study ◽  
High Performance ◽  
Steel Fiber ◽  
Tunnel Lining ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
High Performance Fiber

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.

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