In this study, sprayable strain-hardening fiber-reinforced cementitious composites (FRCC) were applied to strengthen the concrete slabs in a concrete-face rockfill dam (CFRD) for the first time. Experimental, numerical, and analytical investigations were carried out to understand the flexural properties of FRCC-layered concrete slabs. It was found that the FRCC layer improved the flexural performance of concrete slabs significantly. The cracking and ultimate loads of a concrete slab with an 80 mm FRCC layer were 132% and 69% higher than those of the unstrengthened concrete slab, respectively. At the maximum crack width of 0.2 mm, the deflection of the 80-mm FRCC strengthened concrete slab was 144% higher than that of the unstrengthened concrete slab. In addition, a FE model and a simplified analytical method were developed for the design and analysis of FRCC-layered concrete slabs. Finally, the test result of FRCC leaching solution indicated that the quality of the water surrounding FRCC satisfied the standard for drinking water. The findings of this study indicate that the sprayable strain-hardening FRCC has a good potential for strengthening hydraulic structures such as CFRDs.

本研究首次将可喷涂应变硬化纤维增强水泥基复合材料 (FRCC) 应用于混凝土面板堆石坝 (CFRD) 中的混凝土板加固。进行了实验、数值和分析研究，以了解 FRCC 层状混凝土板的弯曲特性。结果表明，FRCC 层显着提高了混凝土板的抗弯性能。具有 80 mm FRCC 层的混凝土板的开裂和极限荷载分别比未强化混凝土板高 132% 和 69%。在最大裂缝宽度 0.2 mm 处，80 mm FRCC 强化混凝土板的挠度比未强化混凝土板高 144%。此外，为 FRCC 层状混凝土板的设计和分析建立了有限元模型和简化分析方法。最后，FRCC浸出液的检测结果表明，FRCC周围的水质满足饮用水标准。这项研究的结果表明，可喷涂的应变硬化 FRCC 在加固水工结构（如 CFRD）方面具有很好的潜力。