Kim Tae-Kyun, Jung Woo-Tai
Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology, 283, Goyang-daero, Ilsanseo-gu, Goyang 10223, Gyeonggi-do, Korea.
Materials (Basel). 2022 Apr 18;15(8):2948. doi: 10.3390/ma15082948.
Structural steel and concrete are essential materials for the construction of social infrastructures. However, these materials undergo degradation over time, thereby causing steel corrosion. To address this problem, a fiber-reinforced polymer (FRP) is used for reinforcement. In this study, tensile tests were performed to evaluate the material properties for the application of the FRP to cable bridge structures. These tests aimed to investigate various parameters to improve bond performance. Based on experiments with different parameters, sufficient bond performance could be achieved if the following conditions are met: mortar water ≤16%, regardless of the manufacturer; a depth of splitting and steel pipe length ratio ≥75%; upward/downward directions for the mortar injection; and the use of fiber-sheet reinforcement. In addition, the steel pipe used in the test (length of 410 mm and outer diameter of 42.7 mm) performed the best in terms of workability and cost effectiveness. By conducting more accurate tests to study the basic properties of materials, more accurate conditions to accomplish sufficient bond performance can likely be achieved. This will contribute to improved cost effectiveness and safety in the use of carbon FRP cables in cable bridge constructions.
结构钢和混凝土是社会基础设施建设的重要材料。然而，这些材料会随着时间的推移而退化，从而导致钢材腐蚀。为了解决这个问题，纤维增强聚合物（FRP）被用于加固。在本研究中，进行了拉伸试验以评估FRP在索桥结构应用中的材料性能。这些试验旨在研究各种参数以提高粘结性能。基于不同参数的实验，如果满足以下条件，就可以实现足够的粘结性能：无论制造商如何，砂浆水含量≤16%；劈裂深度与钢管长度比≥75%；砂浆注入的向上/向下方向；以及使用纤维片材加固。此外，试验中使用的钢管（长度为410毫米，外径为42.7毫米）在可加工性和成本效益方面表现最佳。通过进行更精确的试验来研究材料的基本性能，可能会实现更准确的条件以实现足够的粘结性能。这将有助于提高索桥建设中碳FRP电缆使用的成本效益和安全性。
