Qin Shanming, Gao Danying, Wang Zhanqiao, Zhu Haitang
School of Water Conservancy Engineering, Zhengzhou University, Zhengzhou 450001, China.
College of Civil Engineering, Henan University of Engineering, Zhengzhou 451191, China.
Materials (Basel). 2021 Dec 24;15(1):135. doi: 10.3390/ma15010135.
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 (K) and fracture energy (G) of SFHSC specimens were studied. The results show that an increase in the volume fraction of steel fiber () 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 K and G of SFHSC and HSC for the comparison group has no common characteristics. With an increase in incision depth, the values of K of the SFHSC specimens decrease slightly. The G/G of the SFHSC specimens show a decreasing trend with an increase in 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.
钢纤维混凝土作为应用最为广泛的建筑材料，其性能已得到广泛研究。然而，由于不同强度的钢纤维高强混凝土（SFHSC）的断裂行为不同，其断裂参数的计算方法也有所差异。在本研究中，通过三点弯曲试验对钢纤维增强高强混凝土（SFHSC）的断裂行为进行了研究。共制作了144个尺寸为100mm×100mm×515mm的带切口混凝土梁，并将其分为26组进行三点弯曲试验。研究了钢纤维体积比、钢纤维类型和相对切口深度对SFHSC试件断裂韧性（K）和断裂能（G）的影响。结果表明，向高强混凝土（HSC）中添加钢纤维（）体积分数的增加显著改善了HSC的断裂行为。与铣削和剪切波纹钢纤维相比，切断弓形钢纤维显著改善了SFHSC的断裂行为。切口深度变化对SFHSC和对比组HSC的K和G的影响没有共同特征。随着切口深度的增加，SFHSC试件的K值略有下降。SFHSC试件的G/G随着的增加呈下降趋势。根据试验结果，提出了不同强度SFHSC断裂行为的计算模型。因此，本文提出了一种方便、准确的断裂参数计算方法，为后续研究奠定了基础。
