Mechanical properties of steel fiber reinforced high strength lightweight self-compacting concrete (SHLSCC)

High-strength concrete is used to provide quality control for concrete structures, yet it has the drawback of brittleness. The inclusion of fibers improves the ductility of concrete but negatively affects the fresh properties of fiber-reinforced concrete. The effects of different fine to coarse aggregate ratios on the fresh and hardened properties of steel fiber reinforced concrete were investigated in this study. Mixtures were prepared with various fine to coarse aggregate (FA/CA) ratios incorporating 1% steel fiber content (by volume) at constant water to cement ratio. The workability, unit weight, and temperature of the concrete in the fresh state, and the mechanical properties of steel-fiber-reinforced concrete (SFRC) were investigated. The inclusion of fiber in concrete influenced the mobility of concrete in the fresh state by acting as a barrier to the movement of coarse aggregate. It was observed that the concrete with an FA/CA ratio above 0.8 showed better flowability in the fresh state, whilst an above 0.9 FA/CA ratio requires excessive superplasticizer to maintain the flowability of the mixtures. The compressive and flexural strength of SFRC increased with an increase in the FA/CA ratio by around 10% and 28%, respectively. Experimental values of compressive strength and flexural strength showed good agreement, however, modulus of elasticity demonstrated slightly higher values. The experimentally obtained measurements of the mechanical properties of SFRC conformed reasonably well with the available existing prediction equations, and further enabled establishing predictive isoresponse interactive equations within the scope of the investigation domain.

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Effects of Reinforcing Fiber Strength on Mechanical Properties of High-Strength Concrete

Fibers ◽

10.3390/fib7100093 ◽

2019 ◽

Vol 7 (10) ◽

pp. 93 ◽

Cited By ~ 2

Author(s):

Yun ◽

Lim ◽

Choi

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

High Strength Concrete ◽

Steel Fiber ◽

Fiber Strength ◽

High Strength ◽

Fiber Reinforced Concrete ◽

Fiber Reinforced ◽

Steel Fiber Reinforced Concrete ◽

Strength Concrete

: This paper investigates the effects of the tensile strength of steel fiber on the mechanical properties of steel fiber-reinforced high-strength concrete. Two levels of steel fiber tensile strength (1100 MPa and 1600 MPa) and two steel fiber contents (0.38% and 0.75%) were used to test the compression, flexure, and direct shear performance of steel fiber-reinforced high-strength concrete specimens. The aspect ratio for the steel fiber was fixed at 80 and the design compressive strength of neat concrete was set at 70 MPa to match that of high-strength concrete. The performance of the steel fiber-reinforced concrete that contained high-strength steel fiber was superior to that which contained normal-strength steel fiber. In terms of flexural performance in particular, the tensile strength of steel fiber can better indicate performance than the steel fiber mixing ratio. In addition, a compression prediction model is proposed to evaluate compression toughness, and the model results are compared. The predictive model can anticipate the behavior after the maximum load.

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Strengthening of RC beams using steel fiber reinforced high strength lightweight self-compacting concrete (SHLSCC) and their strength predictions

Materials & Design ◽

10.1016/j.matdes.2016.03.015 ◽

2016 ◽

Vol 100 ◽

pp. 37-46 ◽

Cited By ~ 8

Author(s):

Shahid Iqbal ◽

Ahsan Ali ◽

Klaus Holschemacher ◽

Thomas A. Bier ◽

Abid A. Shah

Keyword(s):

Steel Fiber ◽

High Strength ◽

Rc Beams ◽

Fiber Reinforced ◽

Self Compacting Concrete

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Effect of Fiber on Mechanical Properties and Fire Resistance of C100 Ultra High Strength Concrete

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.629-630.245 ◽

2014 ◽

Vol 629-630 ◽

pp. 245-251

Author(s):

Liang Huo ◽

Xi Qiang Lin ◽

Guo You Li ◽

Tao Zhang

Keyword(s):

Mechanical Properties ◽

Elastic Modulus ◽

Reinforced Concrete ◽

Fire Resistance ◽

Elevated Temperatures ◽

Steel Fiber ◽

High Strength ◽

Fiber Reinforced Concrete ◽

Fiber Reinforced ◽

Fiber Concrete

It used conventional techniques and materials prepared high strength fiber reinforced concrete whose strength class is above C100 and it studied the effect of fiber content on the mechanical properties and elastic modulus. It also studied the fire resistance of fiber reinforced concrete. Results suggest that the strength of 28d concrete is above 100MPa and the highest strength is 126.4MPa. Under the same ratio conditions, the greater the volume content of steel fiber concrete flexural strength, the splitting tensile strength is higher. The steel fiber volume only affect elastic modulus of concrete little. When it heats to 300 °C, the no fiber concrete comminuted burst while the fiber concrete does not damaged at elevated temperatures up to 300 °C and continue to heat up, the crushing damage occurs at about 460 °C. Has not been damaged concrete specimens at 300 °C, the quality have emerged about 3% decline, while the compressive strength increased by 35%-52%, the highest strength reached 180.3MPa.

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