混凝土的耐久性是抵抗各种侵蚀破坏作用的能力。破坏因素随所在环境而异,大致有气候影响、化学腐蚀和机械磨损三方面。(1)气候影响:表现在对冷热、干湿、冻融的胀缩的抵抗能力。在寒冷地区,水在冬季冰冻,春季融化,或夜间冰冻,白天融化。混凝土如存有水分,经气候的变化,常使水分冰冻和融化而体积时 The durability of concrete is the ability to resist various erosion damaging effects. Destructive factors vary with the environment, roughly the three aspects of climate impact, chemical corrosion and mechanical wear. (1) Climate Impact: It shows resistance to the expansion and contraction of hot and cold, wet and dry, freeze-thaw. In cold regions, water is frozen in winter, melted in the spring, or frozen at night and melted during the day. Concrete, such as the presence of water, the climate change, often make the water frozen and thawed and the volume