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钢筋混凝土结构是应用非常广泛的一种结构形式,但由于材料自身、使用环境和设计上的缺点,使得大多数存在时间较长的混凝土结构存在严重的碱蚀问题。从而引起混凝土结构的耐久性问题,使许多结构达不到设计使用年限就提前报废,这给各国带来巨大的经济损失和财政负担。所谓混凝土桥梁碱蚀,是指钢筋混凝土与其环境间的物理化学作用引起混凝土本身强度降低的变化。主要为碱-集料的反应和卤素离子的侵蚀以及由此引起的其它的损坏(钢筋锈胀等)。在此结合实际探讨了混凝土桥梁碱蚀现象的成因及防治办法。
However, due to the material itself, the use of the environment and design shortcomings, most of the concrete structures that exist for a long time have serious alkali corrosion problems. As a result, the durability of concrete structures will be raised and many structures will be scrapped before reaching the design service life, which will bring enormous economic losses and financial burdens to all countries. The so-called concrete bridge corrosion, refers to the physical and chemical interaction between the reinforced concrete and its environment caused by the strength of the concrete itself to reduce the change. The main alkali-aggregate reaction and the erosion of halogen ions and the resulting damage (rebar corrosion, etc.). In this paper, with the actual discussion of the causes of concrete bridge corrosion phenomena and prevention measures.