研究目的：交通工程中桥梁规模、数量在不断地增加，但在已经运营的线路上，有些桥梁却未达到其使用寿命而过早地发生损坏，研究混凝土桥梁病害发生的原因和处理、防治措施，为今后桥梁的结构设计和施工提供有益借鉴。
研究方法：通过对多处存在病害的混凝土桥梁进行实地考察，对其所处环境中的大气、地表水、地下水进行化验，根据侵蚀性介质类型的不同，分别进行物理、化学和结构分析。
研究结果：针对病害混凝土桥梁出现的混凝土保护层松动、剥落和钢筋锈蚀的现象，分析了原因，对存在病害的桥梁提出了加固改造措施，对设计、施工提出了建议。
研究结论：有害物质是以气体或水为载体，以混凝土的裂缝、毛细孔为通道在结构中扩散，和混凝土中的一些物质发生反应，使结构发生破坏。病害混凝土桥梁的处理措施包括提高混凝土密实度和防水抗渗性以及钢筋的耐蚀性，对防止病害的发生、提高桥梁的使用寿命有着重要的意义。
Research purposes: The scale and quantity of bridge is growing up in the traffic construction. But for the operational lines, some bridges damage is so early that they do not reach their lives for use. The paper studies the cause of disease in the concrete bridge, disposal and maintain measure, which makes some instructive suggestion for bridge structural design and construction in the future.
Research methods: By autoptical work to several diseased concrete bridges, the paper makes experiments about their atmosphere, surface water and groundwater. According to the type difference of corrosive mediator, the paper makes analysis of physics, chemistry and structure.
Research results: For the concrete protective layer’ looseness, desquamation and rust-eaten of the reinforcement, the paper makes sure the cause, provides strengthening and reforming measure for the diseased bridge and makes suggestion for design and construction.
Research conclusions: By air and water, through concrete's crack and capillary porosity, corrosive matter diffuses and reacts with some matter in the concrete, makes damage to the structure. The disposal of the diseased concrete bridge includes enhancing the concrete indensity and waterproof impermeability, and stain resistance of the reinforcement. It has significant meaning to prevent from disease, lengthening the life of the bridge.
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