Textile-reinforced concrete (TRC), an innovative combination of fine-grained concrete and textile, facilitates the construction of thin, lightweight structures. Epoxy resin impregnation of textile is commonly applied to improve the mechanical properties of TRC, but it also increases the occurrence of spalling failure, which is not yet fully understood. This study investigates the effects of textile layer number, mesh size, surface treatment, and cover thickness on spalling failure through four-point bending tests conducted on basalt fiber reinforced polymer (BFRP) textile-reinforced concrete plates. The results showed that spalling failure compromised load-bearing capacity in post-cracking stage. Increasing the textile layers alleviated spalling damage and significantly improved ultimate bending stress, toughness, and crack development. Enlarging the textile mesh size effectively suppressed spalling failure, while excessively large mesh size inhibited multi-crack development and degrade flexural performance. Sand-coating treatment enhanced interfacial bonding and modified yarn cross-sectional shape, thereby reducing peeling cracks and improving flexural performance, particularly with fine sand. Similarly, fiber-coating treatments yielded improvements, attributed to enhance bonding and bridging effects of short fibers. In contrast, increasing cover thickness exacerbated spalling damage and decreased flexural capacity. Furthermore, spalling failure was preliminarily predicted based on the balance between spalling resistance and peeling force. These findings provide deeper insights into bending spalling failure and contribute to the development of limit state design for TRC structures.

中文翻译：

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BFRP纺织增强混凝土弯曲剥落破坏的影响因素研究


纺织增强混凝土 （TRC） 是细粒混凝土和纺织的创新组合，有助于建造薄而轻的结构。纺织品的环氧树脂浸渍通常用于改善 TRC 的机械性能，但它也增加了剥落失效的发生，这尚未完全了解。本研究通过对玄武岩纤维增强聚合物 （BFRP） 织物增强混凝土板进行的四点弯曲测试，研究了纺织层数、网孔尺寸、表面处理和覆盖层厚度对剥落破坏的影响。结果表明，剥落破坏影响了开裂后阶段的承载能力。增加纺织品层数减轻了剥落损伤，并显著改善了极限弯曲应力、韧性和裂纹发展。扩大纺织网片尺寸有效抑制了剥落破坏，而过大的网片尺寸则抑制了多裂纹的发展并降低了弯曲性能。覆砂处理增强了界面结合并改变了纱线的横截面形状，从而减少了剥落裂纹并改善了弯曲性能，尤其是在使用细砂时。同样，纤维涂层处理产生了改进，这归因于增强了短纤维的粘合和桥接效果。相比之下，增加覆盖层厚度会加剧剥落损伤并降低弯曲能力。此外，根据抗剥落性和剥离力之间的平衡，初步预测剥落破坏。这些发现为弯曲剥落失效提供了更深入的见解，并有助于开发 TRC 结构的极限状态设计。