Two configurations of closure strips between precast reinforced concrete (RC) slab panels were fabricated and filled with either non-shrink grout or ultrahigh-performance strain-hardening cementitious composite (UHP-SHCC) material. The strips were then strengthened with externally bonded carbon-fibre-reinforced polymer (CFRP) sheets in order to compensate the drawback associated with decreasing the amount of connected steel reinforcing bars required to transfer the bending moment between panels. In total, 12 specimens divided into three groups were cast and tested under short-term non-reversed repeated patch loads simulating wheel load at the central joint. The test results showed that the UHP-SHCC filling material enabled the connected panels to exhibit more ductile behaviour compared with the panels whose closure strips were filled with non-shrink grout. On the other hand, the CFRP strengthening sheets for the first configuration of the closure strip failed to restore the ultimate capacity of the un-strengthened monolithic specimen. However, the second configuration, using UHP-SHCC filling material, enabled the connecting panels to restore lost capacity, with a performance improvement of about 14% compared with the un-strengthened monolithic specimen.

中文翻译：

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使用 CFRP 板加固全深度 RC 桥面板有缺陷的封闭条

在预制钢筋混凝土 (RC) 板面板之间制造了两种封闭条配置，并用非收缩灌浆或超高性能应变硬化水泥基复合材料 (UHP-SHCC) 材料填充。然后用外部粘合的碳纤维增强聚合物 (CFRP) 板加强条带，以弥补与减少在面板之间传递弯矩所需的连接钢筋数量相关的缺点。总共分为三组的 12 个试样在短期非反向重复斑块载荷下进行铸造和测试，模拟中心节点处的车轮载荷。测试结果表明，与封闭条填充非收缩灌浆的面板相比，UHP-SHCC 填充材料使连接的面板表现出更高的延展性。另一方面，封闭带的第一种配置的 CFRP 加强板未能恢复未加强的整体试样的极限容量。然而，使用 UHP-SHCC 填充材料的第二种配置使连接面板能够恢复失去的容量，与未强化的整体试样相比，性能提高了约 14%。