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在大气特别是侵蚀性气体环境中,钢筋混凝土构件的裂缝(不包括早期出现的干缩裂缝和温度裂缝)与钢筋锈蚀的关系,大都考虑两种类型:一种类型是由于混凝土密实度较低,保护层较薄,受到空气中二氧化碳或其他气体的作用,使混凝土中性化而降低其碱度(用普通水泥配制的混凝土,其pH值约12.5～12.6,中性化后可降低到11～10,甚至到9),失去对钢筋的保护性质,则钢筋表面的钝化膜可能破坏,受到水分和氧或其
In the atmosphere, especially in the corrosive gas environment, the relationship between cracks in reinforced concrete structures (excluding early shrinkage cracks and temperature cracks) and the corrosion of steel reinforcements are mostly considered in two types: one is due to the lower density of concrete. The protective layer is relatively thin and is affected by carbon dioxide or other gases in the air to neutralize the concrete and reduce its alkalinity. (The concrete formulated with ordinary cement has a pH of about 12.5 to 12.6, and can be reduced to 11 after neutralization.) ～10, even to 9), losing the protective properties of the reinforcing steel, the passive film on the surface of the reinforcing steel may be damaged, exposed to moisture and oxygen or