Experimental study and mechanism analysis on basic mechanical properties of basalt fiber reinforced concrete
Experimental study and mechanism analysis on basic mechanical properties of basalt fiber reinforced concrete
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DOI：
10.1002/suco.202200046
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发表时间：
2022-11
影响因子：
3.2
通讯作者：
Cheng Wei;Xinjian Sun;Zhenpeng Yu;Pengtao Zhang
中科院分区：
文献类型：
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作者：
Cheng Wei;Xinjian Sun;Zhenpeng Yu;Pengtao Zhang
为了全面考察玄武岩纤维对混凝土基本力学性能的影响，对不同纤维掺量和不同纤维长度的玄武岩纤维混凝土进行了轴压、轴拉和直剪试验。从试验数据中得到了不同加载模式下的破坏模式和应力-应变曲线，并从中提取了BFRC的基本力学参数。根据研究结果，得出以下结论。随着纤维含量的增加，抗压强度和抗拉强度均呈先上升后下降的趋势。总的来说，BFRC的抗剪强度低于普通无纤维钢筋混凝土(RC)。与RC相比，所有BFRC试件的峰值应变都有所增加，变形能力也显著提高。综合分析，纤维含量为0.2%、纤维长度为6 mm(BFRC-0.2%-6)的试件具有最好的力学性能。此外，对BFRC的归一化应力-应变曲线进行了数学回归分析，提出了基于纤维含量和纤维长度的玄武岩纤维影响参数模型。利用扫描电子显微镜和计算机断层扫描技术，从微观和细观两个角度分析了玄武岩纤维含量和纤维长度对混凝土力学性能的影响机理。
In order to comprehensively examine the influence of basalt fiber on the basic mechanical properties of concrete, the axial compression, axial tension and direct shear tests were carried out on basalt fiber reinforced concrete (BFRC) with different fiber contents and fiber lengths. The failure modes and stress–strain curves under different loading modes were obtained from the test data, and the basic mechanical parameters of BFRC were extracted from the curves. Based on the results, the following conclusions were drawn. With the increase of fiber content, both the compressive strength and tensile strength showed an upward trend first followed by a downward trend. In general, the shear strength of BFRC was lower than that of ordinary reinforced concrete with no fiber (RC). All BFRC specimens had an increased peak strain and significantly improved deformability compared to RC. Based on a comprehensive analysis, the specimen with a fiber content of 0.2% and a fiber length of 6 mm (BFRC‐0.2%‐6) exhibited the best mechanical properties. In addition, mathematical regression analysis was performed on the normalized stress–strain curves of BFRC, and the influencing parameters model of basalt fiber was proposed based on the fiber content and fiber length. Moreover, scanning electron microscopy (SEM) and computed tomography were utilized to analyze the influencing mechanism of basalt fiber content and fiber length on the mechanical properties of concrete from the microcosmic and mesoscopic perspectives.