Abstract
The behavior of steel fiber concrete, which is the most widely used building material, has been widely examined. However, methods for calculating Fracture parameters differ by fracture behavior of SFHSC with different strengths. In this study, the fracture behavior of steel-fiber-reinforced high-strength concrete (SFHSC) was -investigated using three-point bending tests. A total of 144 notched concrete beams with a size of 100 mm × 100 mm × 515 mm were tested for three-point bending in 26 groups. The effects of the steel fiber volume ratio, steel fiber type, and relative notch depth on the fracture toughness (KIC) and fracture energy (GF) of SFHSC specimens were studied. The results show that an increase in the volume fraction of steel fiber (ρf) added to high-strength concrete (HSC) significantly improves the fracture behavior of HSC. As compared to milled and sheared corrugated steel fibers, cut bow steel fibers significantly improve the fracture behavior of SFHSC. The effect of incision depth changes on the KIC and GF of SFHSC and HSC for the comparison group has no common characteristics. With an increase in incision depth, the values of KIC of the SFHSC specimens decrease slightly. The GF0.5/GF0.4 of the SFHSC specimens show a decreasing trend with an increase in ρf. According to the test results, we propose calculation models for the fracture behavior of SFHSC with different strengths. Thus, we present a convenient and accurate method to calculate fracture parameters, which lays a foundation for subsequent research.
Highlights
With the development of modern building technology, numerous varied complex structures have emerged with cement concrete performance requirements; methods for improving the performance of concrete are always of interest to researchers [1,2].Currently, there is an increasing demand for high-strength or even ultrahigh-strength concrete, with low cost and few construction difficulties [3]
The results proved that the threshold of the fracture parameters and the ability to resist the bending fatigue load were greater for carbon-fiber-reinforced concrete (CFRC) than for ordinary concrete
The results showed that on enhancing the content of steel fibers, the fracture energy in work of fracture method (WFM) and size effect method (SEM) increased; the increment in WFM was more significant, with High-strength concrete (HSC) becoming more ductile for introducing the fibers
Summary
With the development of modern building technology, numerous varied complex structures have emerged with cement concrete performance requirements; methods for improving the performance of concrete are always of interest to researchers [1,2]. Based on the reinforcement mechanism theory, of steel fiber reinforced concrete and in consideration of the influence of crack subcritical propagation on fracture behaviors, we establish some parameter calculation models of SFHSC suitable for different strengths, that are conducive to the calculation and analysis of large structures. The test is mainly aimed at examining the influence of the steel fiber volume ratio, steel fiber type, relative notch depth, and other factors on the fracture toughness (KIC ) and fracture energy (GF ) of SFHSC To this end, rational calculation models for the fracture behaviors of SFHSC are developed. Steel fiber type, relative notch depth, and other factors on the fracture toughness (KIC) and fracture energy (GF) of SFHSC
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
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 call
