Abstract
Hybrid fiber reinforced concrete (HFRC) is based on a multilevel-reinforcement material design that improves both the compressive strength and tensile strength. Investigations of the mechanical performance of HFRC with two types of steel fibers were conducted experimentally. The investigated parameters were the volume fractions of the short steel fibers and long steel fibers. The compressive strength, tensile strength, and flexural strength of the HFRC were researched. The group with volume fractions of 1.5% for the long steel fibers and 0.5% for the short steel fibers exhibited the best flexural strength. The synergetic effect clearly was improved by combining different types of steel fiber. Four HFRC deep beams and one reinforced concrete (RC) deep beam were conducted to consider the shear behavior of these beams. The primary variables included the volume fraction of steel fibers and the web reinforcement ratio. The shear behavior was evaluated based on the cracking pattern, load-deflection behavior, and shear capacity. All of the beams failed due to the formation of diagonal cracks. The results indicated that hybrid fibers contribute greatly to the shear behavior of deep beams. The hybrid fibers led to the formation of multiple diagonal cracks in the deep beams and enhanced the damage tolerance. With the same web reinforcement ratio, the ultimate load and deformation of the HFRC deep beams were better than those of the RC deep beam.
Highlights
Fiber reinforced concrete (FRC) is commonly used in civil engineering construction, such as in the production of slabs, industrial floors and precast concrete products [1,2,3,4]
Hybrid fiber reinforced concrete (HFRC) is a material that contains different types of fibers, like steel fibers or PVA fibers or different shapes and geometry of steel fibers [12,13,14] applied a variety of different types of fibers in a concrete mixture and advised multimodal fiber reinforced concrete
The flowability was considerably influenced by the increase in the volume fraction of short steel fibers
Summary
Fiber reinforced concrete (FRC) is commonly used in civil engineering construction, such as in the production of slabs, industrial floors and precast concrete products [1,2,3,4]. The incorporation of fibers significantly improves the mechanical performance, including the tensile strength, fracture toughness, and fatigue resistance of the reinforced concrete. The fibers serve as the cracking control reinforcement, and the vehicle to allow for significant internal plastic stress redistribution to increase the strength of the specimens after the first crack forms [5,6,7,8,9,10,11]. The hybrid steel fibers can effectively bridge cracks at both the micro- and macroscale, and the cracking of concrete is a multiscale and multistage process. The microfibers provide effective reinforcement of the micro cracking stage and inhibited the formation of microcracks. The HFRC shows good performance in terms of the confinement and tension stiffening effects. The control of microcracks is Materials 2018, 11, 2023; doi:10.3390/ma11102023 www.mdpi.com/journal/materials
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
