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Title: Shear Behavior of Beams Made of Hybrid Steel-Polyethylene Fiber Reinforced Cementitious Composites
Authors: Yazan Alrefaei 
Supervisor: Prof. Khaldoun N. Rahal
Keywords: Hybrid Steel-Polyethylene Fiber , Cementitious Composites
Issue Date: 2015
Publisher:  Kuwait university - college of graduate studies
Abstract: This thesis reports the results of an experimental investigation of the shear behavior of beams made using Hybrid Fiber Reinforced Cementitious Composites (HFRCC). The hybridization was achieved by a combination of different volume fractions of steel and polyethylene fibers. A total of 21 beams reinforced with longitudinal steel bars and with fibers were tested in a three-point loading setup at a shear to depth ratio of 3. The 21 beam specimens were grouped in four series. Of the 21 beams, 17 beams were cast with cement paste and 4 with cement mortar. Of the 17 cement paste beams, 9 beams contained 2% fiber volume fraction, 4 beams contained 1.5% fiber volume fraction, 3 beams contained 1% fiber volume fraction and 1 non-fibrous control beam. The mortar beams divided into 3 beams contained 1% fiber volume fraction and 1 non-fibrous control beam. In each series, the total fiber volume was kept constant but the specimens differed by the distribution of the total volume of fibers between steel and polyethylene. It is shown that HFRCC made using cement paste was effective in increasing the shear strength up to 8 times relative to the non-fibrous matrix. In the mortar beams, the shear strength capacity increased up to 3 times relative to the non-fibrous matrix. In addition, the use of HFRCC improved the ductility, multiple cracking and strain capacity of the beams. It also led to a shift in the mode of failure of beams with relatively high fiber content to a relatively more ductile flexural failure as the ultimate load was achieved after the yielding of the longitudinal bars. The addition of sand limited the improvements in the shear strength, multiple cracking and the tensile strain capacity. HFRCC was able to increase the shear strength from 0.36 to 0.58 of the square root of the cylinders compressive strength. Both steel and polyethylene fibers were highly effective in increasing the shear strength. The observed results proved the advantages of using HFRCC in structural applications and replacing the conventional shear transverse reinforcement.
Appears in Programs:0620 Civil Engineering

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