Study on mechanical properties and evolution of acoustic emission characteristic parameters of basalt fiber shotcrete

IF 7.4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of building engineering Pub Date : 2025-09-28 DOI:10.1016/j.jobe.2025.114218

Pengfei Fang, Min Huang, Qingfeng Chen, Jingmin Duan, Yajun Lv, Jingjing Li, Weizhun Jin

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Abstract

Basalt fiber (BF) possesses advantages such as high strength, corrosion resistance, and environmental friendliness. When combined with shotcrete (SC), its mechanical properties can be enhanced. Acoustic emission (AE) is an effective method to nondestructively assess the damage of concrete structures. The damage state of concrete structures can be effectively analyzed by the variation of AE characteristic parameters. Based on this, the effects of different BF dosage (0, 0.1 %, 0.3 %, and 0.5 %) and length (6 mm, 12 mm, and 18 mm) on mechanical properties of SC were studied. AE technology was used to monitor the propagation of internal cracks in the bending state of SC, and the changes of AE characteristic parameters of SC were analyzed. The results show that the compressive and flexural strengths of basalt fiber shotcrete (BFSC) increase first and then decrease with an increase in BF dosage. At age of 28 d, the compressive strength of SC with a BF dosage of 0.1 % and a length of 12 mm can reach 49.1 MPa, while the flexural strength reaches the maximum at a BF dosage of 0.3 % and a length of 18 mm, which is 32.0 % higher than that of control group. The hydration products of BFSC adhere to the fiber surface, improve the density of SC, and inhibit the development of cracks. With an increase in BF dosage, the energy and peak value of ringing counts of BFSC with different fiber lengths gradually increase, and the change law with time is similar. When BFSC reaches the breaking point, the cumulative energy and the cumulative ringing counts will make a platform transition. Three-dimensional spatial acoustic location can be used to monitor the initiation, development, and propagation direction of cracks in BFSC, and can effectively reflect the damage evolution in BFSC at different stress stages.

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玄武岩纤维喷射混凝土力学性能及声发射特征参数演化研究

玄武岩纤维具有强度高、耐腐蚀、环保等优点。与喷射混凝土（SC）配用可提高其力学性能。声发射（AE）是一种有效的混凝土结构损伤无损评估方法。通过声发射特征参数的变化可以有效地分析混凝土结构的损伤状态。在此基础上，研究了不同BF用量（0、0.1%、0.3%、0.5%）和长度（6、12、18 mm）对SC力学性能的影响。采用声发射技术监测SC弯曲状态下内部裂纹的扩展，分析SC的声发射特征参数的变化。结果表明：随着BF掺量的增加，玄武岩纤维喷射混凝土的抗压强度和抗弯强度先增大后减小；28日龄时，当BF用量为0.1%、长度为12 mm时，SC的抗压强度可达49.1 MPa，而当BF用量为0.3%、长度为18 mm时，SC的抗折强度达到最大值，比对照组提高了32.0%。BFSC的水化产物粘附在纤维表面，提高了SC的密度，抑制了裂缝的发展。随着BF用量的增加，不同纤维长度BFSC的振铃计数能量和峰值逐渐增大，且随时间的变化规律相似。当BFSC达到断点时，累积能量和累积振铃数将发生平台过渡。三维空间声定位可以监测BFSC中裂纹的起裂、发展和扩展方向，有效反映BFSC在不同应力阶段的损伤演变过程。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of building engineering Engineering-Civil and Structural Engineering

CiteScore

10.00

自引率

12.50%

发文量

1901

审稿时长

35 days

期刊介绍： The Journal of Building Engineering is an interdisciplinary journal that covers all aspects of science and technology concerned with the whole life cycle of the built environment; from the design phase through to construction, operation, performance, maintenance and its deterioration.