Study on Fatigue Durability of RC Bridge Deck Subjected to Chloride Induced Deterioration due to Deicing Salts

本研究旨在探讨除冰盐对混凝土桥面氯致劣化的疲劳耐久性。首先，制作全尺寸RC桥面模型，进行氯致劣化加速试验。然后，采用半电池电势法、裂纹和腐蚀目测法测定劣化程度。其次，对显著劣化试件进行冲剪试验和轮载跟踪试验，研究RC桥面承载能力和疲劳耐久性。将数据与未变质标本的数据进行比较。试验结果表明，微变质试件的抗冲剪能力与健康试件基本相同。车轮跟踪载荷试验结果表明，劣化试样的刚度和疲劳耐久性较健康试样略有降低。

This research is to investigate the fatigue durability of RC bridge deck subjected to chloride induced deterioration due to deicing salts. Firstly, manufacturing full-scale specimens modeling RC bridge deck, the accelerated tests supposing the chloride induced deterioration are performed. Then, the degree of deterioration is measured by half-cell potential method, visual evaluation of cracking and corrosion.Next, the punching shear test and wheel load tracking test for remarkably deteriorated specimens are performed in order to investigate the load-carrying capacity and the fatigue durability of the RC bridge deck. The data is compared to that of specimens without deterioration.The experimental results reveal that the resistance of punching shear of the slightly deteriorated specimen is almost the same as that of the health one. Further, as a result of wheel tracking load test, it is indicated that the rigidness and the fatigue durability of deteriorated specimen are slightly reduced comparing with the health one.