The concrete undergoes brittle failure, which is a disadvantage for stability and safety analysis. This drawback was compensated by addition of different types and size of fibers for improving the compressive and fracture characteristics. The incorporation of multi-scale hybrid fibers in concrete showed enhanced performance at multi-level than that of single type or size of fiber. This study examined the influence of basalt fiber length (12, 25, 37, and 50 mm) and content (0.15% and 0.3%) on compressive and fracture parameters of hybrid fiber reinforced concrete (HyFRC). Systematic experimentations were performed on mechanical properties which include compressive strength (f'_c), toughness index (ɳ) and capability coefficient index (ξ), initial fracture toughness (), unstable fracture toughness (), and fracture energy (). The crack resistance process and fiber-matrix interaction obtained by scanning electron microscopy analysis were also discussed. The proposed analytical models of HyFRC stress–strain equations indicated great suitability for fitting of experimental behavior with R² ≥ 0.92. The basalt fiber with different length and contents showed a great potential in HyFRC and indicated a substantial degree of enhancement for the compressive and fracture properties, as compared to that of PC and HyFRC without basalt fiber.

中文翻译：

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不同玄武岩纤维长度和含量的混合纤维混凝土

混凝土会发生脆性破坏，这对稳定性和安全性分析不利。这个缺点通过添加不同类型和尺寸的纤维来改善压缩和断裂特性得到补偿。与单一类型或尺寸的纤维相比，在混凝土中掺入多尺度混合纤维在多层次上表现出增强的性能。本研究考察了玄武岩纤维长度（12、25、37 和 50 毫米）和含量（0.15% 和 0.3%）对混合纤维增强混凝土 (HyFRC) 的压缩和断裂参数的影响。对包括抗压强度 (f' _c )、韧性指数 (ɳ) 和能力系数指数 (ξ)、初始断裂韧性 ( )、不稳定断裂韧性 () 和断裂能 ( )。还讨论了通过扫描电子显微镜分析获得的抗裂过程和纤维-基体相互作用。所提出的 HyFRC 应力-应变方程分析模型表明非常适合拟合 R ²  ≥ 0.92 的实验行为。与不含玄武岩纤维的 PC 和 HyFRC 相比，不同长度和含量的玄武岩纤维在 HyFRC 中显示出巨大的潜力，并表明其抗压和断裂性能有相当程度的增强。