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| Disposal of Diseased Concrete Bridge |
| CHEN Gang |
| The 3rd Railway Survey & Design Institute, Tianjin 300142, China |
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Abstract 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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Received: 15 June 2006
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周以惜,张绍麟.建筑材料[M].北京:中国铁道出版社,1994.
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GB 50108-2001,地下工程防水技术规范[S].
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2006, Vol. 23 
