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一、混凝土耐久性及使用寿命 1.混凝土构筑物的侵蚀在欧洲,混凝土耐久性问题已日益引起重视。15年前,建筑物的修复费用比建筑费用要少得多,但如今,修复费用几乎相当于新建费用的一半。从使用十余年的高速公路混凝土桥梁的破坏情况来看,大体上有两种侵蚀现象。一种是由于混凝土水灰比高、质量差,混凝土表面碳化,由内应力致使混凝士膨胀,保护层脱落,引起钢筋锈蚀。另一种是冬季公路
I. Durability and service life of concrete 1. Erosion of concrete structures In Europe, the durability of concrete has attracted increasing attention. Fifteen years ago, the cost of repairing the building was much less than the construction cost, but now, the repair cost is almost half of the new construction cost. Judging from the damage of concrete highway bridges that have been used for more than a decade, there are generally two kinds of erosion phenomena. One is that due to the high water-cement ratio of concrete and poor quality, the surface of the concrete is carbonized, and the internal stress causes the condensate to expand, and the protective layer falls off, causing corrosion of the steel bar. The other is the winter road