Abstract: As the time goes by concrete dams have become ageing gradually, which is characterized by foundation variation, mass changed, erosion being become more serious, erosion intensified, cracks developed, the disaster from freezing and melting growing on and the equipment of flood discharge corrosion being worse. The geometry of concrete dam, its mechanical index and function as water retaining and discharging will gradually transform to the unfavorable condition for safety operation. So inspection and monitoring work should be strengthened on the concrete dam ageing, meanwhile, the measures should be taken to prevent from ageing in order to make it being long used.

摘要： 混凝土坝随着坝龄的增长而渐趋老化，其老化性状主要表现为基础变异、体积改变、溶蚀加重、碳化累进、冲磨空蚀加剧、裂缝增生扩展、冻融冻胀加深和泄洪设备腐蚀衰变；混凝土坝的几何形状、力学指标以及挡水、泄水功能，将逐渐向不利于安全运行的方面转化；须加强混凝土坝老化性状的检查监测，并及时采取防止或延缓老化的措施，以保证混凝土坝长葆青春。