Acoustic Emission Characteristics and Failure Patterns of Basalt Fiber and Basalt Textile Reinforced Concrete under Flexural Load

ABSTRACT

The effects of fiber structure and curing period on the flexural properties of basalt fibers reinforced fine-grained concrete were investigated in this paper. The damage and fracture processes of composites were monitored using acoustic emission technology. The flexural behavior of composites in terms of load-displacement curves, ultimate flexural load, and toughness was studied. The damage and fracture patterns of composites were described using acoustic emission parameters such as ringing count, amplitude, and accumulative energy. In the middle and late periods, basalt textiles outperformed basalt fibers in terms of improving the flexural load of fine-grained concrete. The flexural load improved at first and then decreased as the amount of basalt fibers increased, while the flexural load continued to improve as the amount of basalt textiles increased. Compared with basalt fibers reinforced fine-grained concrete, the flexural load of basalt textiles reinforced fine-grained concrete with 28 days curing period increased by 13.40%, −2.13%, and 75.96%, respectively. In terms of acoustic emission, the basalt textiles reinforced fine-grained concrete released more energy, the intensity and frequency of the acoustic emission signal were higher, and the cumulative ringing count was also greater. The basalt textiles reinforced fine-grained concrete exhibited greater flexural deflection and ductility.

摘要

研究了纤维结构和养护时间对玄武岩纤维增强细粒混凝土抗弯性能的影响. 利用声发射技术对复合材料的损伤和断裂过程进行了监测. 从载荷-位移曲线, 极限弯曲载荷和韧性方面研究了复合材料的弯曲行为. 利用声发射参数, 如振铃数, 振幅和累积能量, 描述了复合材料的损伤和断裂模式. 在中后期, 玄武岩纤维在改善细颗粒混凝土的弯曲荷载方面优于玄武岩纤维. 随着玄武岩纤维含量的增加, 弯曲载荷先增大后减小, 而随着玄武岩纤维含量的增加, 弯曲载荷继续增大. 与玄武岩纤维增强细粒混凝土相比, 28天养护期玄武岩纤维增强细粒混凝土的弯曲荷载分别提高了13.40%, 2.13%和75.96%. 在声发射方面, 玄武岩纤维增强细粒混凝土释放的能量更多, 声发射信号的强度和频率更高, 累积振铃数也更大. 玄武岩纤维增强细粒混凝土表现出更大的弯曲挠度和延展性.

KEYWORDS:

• Basalt fiber and textile
• fine-grained concrete
• flexural properties
• acoustic emission technology
• real-time monitor
• fracture patterns

关键词:

• 玄武岩纤维和纺织品
• 细粒混凝土
• 弯曲性能
• 声发射技术
• 实时监控
• 断裂模式

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX20_1785]; National Key Research and Development Program of China [2016YFB0303200].