Abstract
The size effect on the flexural behavior of ultra-high-performance hybrid fiber-reinforced concrete (UHP-HFRC) was investigated. Three different sizes of specimens were tested using four-point bending in a three-dimensional scale: 50×50×150mm3 (small), 100×100×300 mm3 (medium), and 150×150×450mm3 (large). For each size, two UHP-HFRCs with different fiber contents were tested to investigate the influence of tensile ductility on the size effect of UHP-HFRC in flexure. UHP-HFRC1 contained 1.0% twisted steel macro-fiber (T-fiber) and 0.5% short, smooth steel micro-fiber (SS-fiber) by volume, while UHP-HFRC2 contained a blend of 1.0% T-fiber and 1.0% SS-fiber. Both UHP-HFRCs demonstrated clear size effect on flexural strength, normalized deflection, and normalized energy absorption capacity. Furthermore, the flexural behavior of UHP-HFRC1, with its lower tensile ductility, was more sensitive to the size of the specimen.
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