Kim Tae-Kyun, Park Jong-Sup
Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology, 283, Goyang-daero, Ilsanseo-gu, Goyang-si 10223, Korea.
Materials (Basel). 2022 May 2;15(9):3267. doi: 10.3390/ma15093267.
The number of aged bridges among concrete structures is increasing. Therefore, to increase their lifespans, repair and reinforcement schemes ought to be implemented. This study selected various repair materials according to crack-surface treatment, crack-filling, and crack-injection methods. These repair materials were evaluated using various test methods proposed by the Korean Standards and the American Society for Testing and Materials for structure protection, structure restoration, and crack repair; the results were analyzed and compared. Consequently, the structure restoration material exhibited a similar freezing-thawing trend as that of chloride, while also exhibiting similar flexural, compressive, bond, and splitting-tensile strengths. However, chloride yielded performance differences (up to two-fold) depending on the type of material used for comparison. The crack-repair material yielded similar trends only for bond strength but yielded differences (up to 2-4-fold) in tensile, compressive, and flexural strengths depending on the material used for comparison. These results confirmed that crack-repair materials exhibit significant differences in performance depending on the manufacturer compared with structure protection and structure restoration materials. Therefore, it is expected that repair materials appropriate for usability, durability, and structure safety, while also being environmentally friendly, could be used in future bridge repairs based on these test evaluations.
混凝土结构中老龄桥梁的数量正在增加。因此，为了延长其使用寿命，应该实施修复和加固方案。本研究根据裂缝表面处理、裂缝填充和裂缝注入方法选择了各种修复材料。使用韩国标准和美国材料与试验协会提出的各种测试方法对这些修复材料进行了结构保护、结构修复和裂缝修复方面的评估；对结果进行了分析和比较。结果表明，结构修复材料与氯化物具有相似的冻融趋势，同时还具有相似的抗折、抗压、粘结和劈裂抗拉强度。然而，根据用于比较的材料类型，氯化物的性能存在差异（高达两倍）。裂缝修复材料仅在粘结强度方面呈现相似趋势，但根据用于比较的材料不同，其抗拉、抗压和抗折强度存在差异（高达2至4倍）。这些结果证实，与结构保护和结构修复材料相比，裂缝修复材料的性能因制造商而异。因此，预计基于这些测试评估，未来桥梁修复中可以使用适用于可用性、耐久性和结构安全性且环保的修复材料。
