Flexural Cracking Behavior Of Steel Fiber Reinforced Concrete Beams
Journal: International Journal of Scientific & Technology Research (Vol.6, No. 8)Publication Date: 2017-08-15
Authors : Ashraf Abdalkader; Omer Elzaroug; Farhat Abubaker;
Page : 273-277
Keywords : Steel fibers; Normal strength concrete; Crack width; Compressive strength; Splitting tensile strength; First cracking load; Maximum load.;
Abstract
Steel fibers are added to concrete due to its ability to improve the tensile strength and control propagation of cracks in reinforced concrete members. Steel fiber reinforced concrete is made of cement fine water and coarse aggregate in addition to steel fibers. In this experimental work flexural cracking behavior of reinforced concrete beams contains different percentage of hooked-end steel fibers with length of 50 mm and equivalent diameter of 0.5 mm was studied. The beams were tested under third-point loading test at 28 days. First cracking load maximum crack width cracks number and load-deflection relations were investigated to evaluate the flexural cracking behavior of concrete beams with 34 MPa target mean strength. Workability wet density compressive and splitting tensile strength were also investigated. The results showed that the flexural crack width is significantly reduced with the addition of steel fibers. Fiber contents of 1.0 resulted in 81 reduction in maximum crack width compared to control concrete without fiber. The results also showed that the first cracking load and maximum load are increased with the addition of steel fibers.
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