This study investigates the feasibility of completely replacing traditional mesh reinforcement with non-corrodible fiber-reinforced mortar (FRM) in secondary roofing slabs. Patch-load tests were conducted on 36 secondary roofing slabs containing mesh reinforcement, FRM with polyester or structural synthetic fibers only, or a combination of these. The ferrocement specimens carried the highest load but failed due to the sudden rupture of the steel mesh. The slabs with only polyester fibers experienced a brittle failure with low load-carrying capacity. On the other hand, the specimens containing only structural synthetic fibers achieved the requisite residual load-carrying capacity for secondary roofing slabs and also exhibited enhanced ductility through high flexural toughness, thereby sustaining large deflections. This study demonstrates that slabs with structural synthetic fibers alone are sufficient for practical application. The results from the test program were analyzed using yield line theory, based on the stress–strain relation for FRM recommended by the fib Model Code 2010. The first crack and residual load-carrying capacities of the slabs were estimated with reasonable accuracy, thereby providing an analytical basis to predict the behavior of secondary roofing slabs.

中文翻译：

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用于二次屋面板的纤维增强砂浆

本研究调查了在二次屋面板中用耐腐蚀纤维增强砂浆 (FRM) 完全替代传统网状增强材料的可行性。对 36 块二次屋面板进行了修补载荷测试，这些屋面板包含网状增强材料、仅含聚酯纤维或结构合成纤维的 FRM，或这些材料的组合。钢筋水泥试样承受最高载荷，但由于钢网突然破裂而失败。仅含有聚酯纤维的板会发生脆性破坏，承载能力低。另一方面，仅包含结构合成纤维的试样达到了二次屋面板所需的残余承载能力，并且还通过高弯曲韧性表现出增强的延展性，从而承受大挠度。这项研究表明，仅具有结构合成纤维的板就足以满足实际应用需求。基于 FRM 推荐的应力应变关系，使用屈服线理论分析了测试程序的结果fib Model Code 2010。以合理的精度估计了楼板的第一裂缝和剩余承载能力，从而为预测二次屋面板的行为提供了分析基础。