Li Sheng, Luo Hanglin, Zhao Yichen, Zhou Xiaojun
Department of Road and Bridge Engineering, Sichuan Vocational and Technical College of Communications, Chengdu 611130, China.
School of Architecture and Civil Engineering, Xihua University, Chengdu 610039, China.
Materials (Basel). 2025 Feb 28;18(5):1095. doi: 10.3390/ma18051095.
Traditional concrete bridge decks often incorporate steel mesh to ensure connection and prevent cracking. However, the cracking in the connecting layer, low bond strength, misalignment of steel mesh, and settling at the bottom often appear. In this study, fiber-reinforced concrete was used for the bridge deck overlay, and a horseshoe-shaped shear key was employed to connect it with the beam body, forming a robust composite bridge deck system. By optimizing the concrete composition and interface bonding methods within the system, a comprehensive investigation was conducted into the compressive and splitting tensile strengths of different composite systems. The findings showed that the horseshoe-shaped shear key enhances the splitting tensile strength of the composite structural system while maintaining its compressive strength, ensuring a certain level of structural integrity during failure. As the strength grade of the steel fiber-reinforced concrete in the deck overlay increases, the compressive and splitting tensile strengths of the composite system initially rise and then stabilize, with C40 being the optimal strength grade for the deck overlay concrete. Furthermore, the overall performance of the deck overlay concrete with steel fibers is superior to that with the POM and PP fibers. The application of the YJ-302 interface bonding agent at the connection between the deck overlay and the beam body concrete further enhances the mechanical properties of the composite system.
传统的混凝土桥面板通常采用钢筋网来确保连接并防止开裂。然而，连接层开裂、粘结强度低、钢筋网错位以及底部沉降等问题经常出现。在本研究中，纤维增强混凝土被用于桥面板加铺层，并采用马蹄形剪力键将其与梁体连接，形成了一个坚固的组合桥面板系统。通过优化系统内的混凝土组成和界面粘结方法，对不同组合系统的抗压强度和劈裂抗拉强度进行了全面研究。研究结果表明，马蹄形剪力键在保持组合结构系统抗压强度的同时，提高了其劈裂抗拉强度，确保了结构在破坏过程中的一定完整性。随着桥面板加铺层中钢纤维增强混凝土强度等级的提高，组合系统的抗压强度和劈裂抗拉强度先上升后稳定，C40是桥面板加铺层混凝土的最佳强度等级。此外，钢纤维桥面板加铺层混凝土的整体性能优于POM纤维和PP纤维的桥面板加铺层混凝土。在桥面板加铺层与梁体混凝土的连接处应用YJ - 302界面粘结剂进一步提高了组合系统的力学性能。
