钢筋混凝土是一种耐久性较好的材料,一般不考虑环境介质的影响,不采取任何保护措施。廿世纪初期,有些工程局部被破坏了,有的甚至十分严重,这就引起了人们的高度重视。通过调查研究,发现这些工程被破坏的原因有两个:一是混凝土本身耐久性不够,破坏了钢筋保护层;二是钢筋在混凝土中先发生锈蚀,铁锈膨胀,使混凝土保护层崩落。由此可见,对于钢筋混凝土工程,特别是对于严酷环境下的钢筋混凝土工程以及 Reinforced concrete is a kind of durable material. Generally, it does not consider the influence of environmental media and does not take any protective measures. In the early years of the 21st century, some projects were partially destroyed, and some were even very serious. This caused people’s great attention. Through investigation and research, it was found that there were two reasons for the destruction of these projects: First, the durability of the concrete itself was not enough, and the protective layer of the steel was damaged; second, the steel bar first rusted in the concrete, rust swelled, and the concrete protective layer collapsed. It can be seen that for reinforced concrete works, especially for reinforced concrete works under severe conditions and