Effect of mineral admixtures and steel fiber volume contents on the behavior of high performance fiber reinforced concrete

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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Analytical Prediction of the Mechanical Properties of High Performance PVA Fiber Reinforced Concrete

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.567.345 ◽

2014 ◽

Vol 567 ◽

pp. 345-350 ◽

Cited By ~ 1

Author(s):

Tehmina Ayub ◽

Nasir Shafiq ◽

Muhd Fadhil Nuruddin

Keyword(s):

Mechanical Properties ◽

Reinforced Concrete ◽

High Performance ◽

Fiber Reinforced Concrete ◽

Analytical Prediction ◽

Fiber Reinforced ◽

Fiber Volume ◽

Binder Ratio ◽

High Performance Fiber ◽

Pva Fiber

In this paper, mechanical properties of three series of high performance fiber reinforced concrete (HPFRC) containing 1, 2 and 3% of Polyvinyl Alcohol (PVA) fiber volume are presented. The first series of HPFRC was prepared by using 100% cement, whereas remaining two series were prepared by replacing 10% cement content with silica fume and locally produced metakaolin. All series were designed with water to binder ratio (w/b) of 0.4. The mechanical properties determined in this study include compressive strength, splitting tensile strength and flexural strength. Testing of the specimens was conducted at the 28 days of curing. Experimental results showed that the 3% PVA fiber is the optimum fiber volume to improve the mechanical properties of HPFRC. The variation in the mechanical properties due to the addition of PVA fibers was investigated and presented in the form of mathematical relationship. Further, interrelationship among the mechanical properties was also determined.

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Influence of Fiber Geometry on the Mechanical Properties of Ultra-High Performance Fiber Reinforced Concrete (UHPFRC)

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.243-249.510 ◽

2011 ◽

Vol 243-249 ◽

pp. 510-513

Author(s):

Song Lin Yang ◽

Bo Diao ◽

Ying Hua Ye

Keyword(s):

Tensile Strength ◽

Reinforced Concrete ◽

High Performance ◽

Volume Ratio ◽

Fiber Reinforced Concrete ◽

Fiber Reinforced ◽

Fiber Volume ◽

Flexural Tensile Strength ◽

High Performance Fiber ◽

Ductile Behavior

Ultra-High Performance Fiber Reinforced Concrete (UHPFRC) has been a technological breakthrough offering compressive strength over 100MPa and tensile strength over 10MPa with true ductile behavior. Three types of frequently used fibers including flattened end, hooked end and crimped fibers, were used in producing UHPFRC with fiber volume ratios of 1%, 2%, 2.5% and 3% to investigate different reinforcing effect of fiber geometry on UHPFRC. The results showed that specimens with flatted fibers showed the highest flexural tensile strength, and specimens with crimped fibers showed the lowest flexural tensile strength. The optimum volume ratio for the flattened end fibers or hooked end fiber was 2%. The hooked end fibers were more preferable for producing ductile UHPFRC.

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