作者: AA Elakhras , MH Seleem , HEM Sallam
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摘要: This study developed a novel approach to measure the intrinsic fracture toughness of full-depth fiber reinforced concrete (FRC) and functionally graded concrete (FGC) beams. Three concrete mixes were prepared to cast FGC beams, namely normal strength concrete to be cast in the middle layer of the FGC beams, FRC with 1% hooked-end steel fiber, to be cast in the bottom layer (tensile layer), and high strength concrete (HSC) to be cast in the top layer (compressive layer). Ninety-six un-cracked and matrix-cracked (crack length to depth ratio equals 1/3) FRC and FGC beams were cast and tested under 3 PB. These beams included three span-length to depth (L/d) ratios, 4, 5, and 6. The fracture toughness was measured based on the present proposed method and Hillerborg's concept, i.e., work of fracture method (WFM). The applicability of these methods was judged based on the maximum size of the non …