Hybrid fiber concrete with different basalt fiber length and content
Hybrid fiber concrete with different basalt fiber length and content
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DOI：
10.1002/suco.202000472
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发表时间：
2021-06-14
影响因子：
3.2
通讯作者：
Ali, Majid
中科院分区：
文献类型：
--
作者：
Khan, Mehran;Cao, Mingli;Ali, Majid
混凝土发生脆性破坏，不利于稳定性和安全性分析。通过添加不同类型和尺寸的纤维以改善压缩和断裂特性来补偿该缺点。多尺度混杂纤维的掺入比单一纤维种类或尺寸的混凝土表现出多层次的性能增强。本研究探讨玄武岩纤维长度（12，25，37，和50毫米）和含量（0.15%和0.3%）的混合纤维增强混凝土（HyFRC）的压缩和断裂参数的影响。对材料的抗压强度（f '（c））、韧性指数（eta）、能力系数指数（xi）、初始断裂韧性（K-ini（IC））、失稳断裂韧性（K-uns（IC））、断裂能（GF）等力学性能进行了系统的试验研究。并对扫描电镜分析所得的抗裂过程和纤维-基体相互作用进行了讨论.所提出的HyFRC应力-应变方程的分析模型表明，非常适合拟合的实验行为与R-2 >= 0.92。不同长度和含量的玄武岩纤维在HyFRC中表现出很大的潜力，并表明压缩和断裂性能的显着程度的提高，相比，PC和HyFRC没有玄武岩纤维。
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 (eta) and capability coefficient index (xi), initial fracture toughness (K-ini(IC)), unstable fracture toughness (K-uns(IC)), and fracture energy (GF). 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 R-2 >= 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.