RETRACTED: Shear behaviour of concrete beams with recycled aggregate and steel fibres

Shear Strength of Fiber Reinforced Recycled Aggregate Concrete

“…Table 1 [ 15 , 20 , 21 , 22 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 ] highlights the literature focusing on RCA’s effects on shear strength, with the last three rows focusing specifically on the effect of fibers addition on shear strength of RCA. RCA generally decreases shear strength in beams as well as cylindrical push-off specimens [ 22 , 50 , 52 , 55 , 56 , 57 , 58 , 61 ], in addition, other research efforts indicated that shear strength is decreasing as the RCA replacement ratio increases [ 15 , 63 ].…”

“…Utilizing steel fiber to improve shear capacity was investigated in the early 90′s [ 69 , 70 , 71 ]. Steel fibers control the spreading of cracks in a specimen, and thus reduce the width of cracks [ 65 ]. Research efforts by [ 69 , 70 , 72 ] focus on the improvement of shear strength when steel fibers are added, and in addition, models/equations capable of predicting shear contribution of fiber reinforced concrete and the improvement of shear strength are proposed by [ 70 , 73 ].…”

“…When short steel fibers are added in RCA specimens, the reduction in shear strength is negated, and additional shear strength is provided [ 64 ], which could be attributed to the fiber ability to bridge cracks and improve the ITZ performance in RCA [ 67 ]. Increasing the RA replacement ratio improved the shear behavior with different transverse reinforcement spacing in fiber reinforced concrete [ 65 ], and shear strength of beams considerably improves in beams, cylinders, cubes, and prisms when fibers are added to specimens with RCA [ 66 ]. The available literature, to the authors’ knowledge, that discusses the ideas presented in the current investigation to evaluate the contribution of different types of fibers to shear strength of RA is limited, highlighting the need for more research efforts to encourage the use of RCA in structural applications.…”

Effect of steel fiber on the shear behavior of reinforced recycled aggregate concrete beams

“…However, adding steel fibers to concrete mixes resulted in higher ductility and an increase in the first cracking and ultimate moment by 20%, 14%, respectively. Steel fiber enhanced the shear behavior of RAC beams and reduced the crack propagation [20].…”

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