Abstract
The use of fibers in cementitious composites yields numerous benefits due to their fiber-bridging capabilities in resisting cracks. Therefore, this study aimed to improve the shear-resisting capabilities of conventional concrete through the hybridization of multiple synthetic fibers, specifically on reinforced concrete structures in seismic-prone regions. For this study, 16 hybrid fiber-reinforced concretes (HyFRC) were developed from the different combinations of Ferro macro-synthetic fibers with the Ultra-Net, Super-Net, Econo-Net, and Nylo-Mono microfibers. These hybrids were tested under direct shear, resulting in improved shear strength of controlled specimens by Ferro-Ultra (32%), Ferro-Super (24%), Ferro-Econo (44%), and Ferro-Nylo (24%). Shear energy was further assessed to comprehend the effectiveness of the fiber interactions according to the mechanical properties, dosage, bonding power, manufactured material, and form of fibers. Conclusively, all fiber combinations used in this study produced positive synergistic effects under direct shear at large crack deformations.
Highlights
The normal-strength concrete is strong in compression, it is brittle and requires the support of steel reinforcements in order to prevent shear, tensile, and flexural failure
Navas et al [16] conducted an experimental study on the shear behavior of reinforced concrete with polypropylene macro-synthetic fibers, and the findings showed that the macrofibers serve as an effective mechanism of shear transfer in cementitious composites
The application was directed at reinforced concrete (RC) structures located two notches with the width measurement of 1 mm and depth measurement of 10 mm were sawed at in the seismic-prone regions, where critical areas such as the beam-column joints are limited by each side of the mid-span area to pre-define the crack propagation during the narrow spaces due to steel congestion
Summary
The normal-strength concrete is strong in compression, it is brittle and requires the support of steel reinforcements in order to prevent shear, tensile, and flexural failure. This poses problems for structures in seismic-prone regions since more steel reinforcements are needed to efficiently manage the crack zones. The incorporation of a large amount of steel reinforcements would result in certain complications, such as steel congestion, improper concrete compaction, labor-intensive work, and increased project costs. Four different types of fibers are available for use, namely, steel (Type I), synthetic Several companies have already developed macro-synthetic fibers that can replace the secondary steel reinforcements in concretes [3]
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