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Question

In temperate marine climates away from direct sea spray there is a slow accumulation of chloride within the concrete. In post-tensioned structures, attack on the strands themselves in this type of environment is rare. Provided that ducts and grout are intact there is little likelihood of corrosion of post-tensioned members in this type of environment. Tropical marine environments represent a much more severe type of exposure. Year-round warm temperatures help foster both the rate of ingress of the chlorides as well as the rate of corrosion itself. For pre-tensioned members to be durable over the long term in such environments it may be necessary to invest in high quality concretes having low permeability to chloride ions. F& post-tensioned members, the use of noncorroding ducts (such as polyethylene ducts) would help to halt the progress of chlorides towards the strand. Care must also be taken to protect the anchorage areas, such as encapsulation of the anchorage in impermeable material.
In deicing environments pre- and post-tensioned structures show susceptibility to corrosion at localized points on the structure. This can be at end expansion joints separating the deck slab from the approach slab, at joints separating the spans along the length of the bridge, through longitudinal spaces between adjacent box beams, and at anchorage zones in post-tensioned members. The actions of traffic and environment lead to joint failure, which allows deicer solutions to pass through the joint onto the pier caps and beam-ends in I-beams, and onto the sides of box beams. Installation of gutters and downspouts to carry deicer solutions safely off the deck, and careful joint inspection and maintenance can help to reduce the potential for corrosion in these structures. For posttensioned elements, it is very important that the grout fully encapsulates the tendons within the ducts, and that no potentially corrosive substances be added to the grouts.

Answer 1

在温带海洋气候摆脱直接浪花是一个缓慢的积累氯化混凝土. 后张预应力结构,攻击束自己在这种环境中是罕见的. 只要管道及灌浆完好,是拿着腐蚀后张委员在本类 环境. 热带海洋环境构成严重得多式曝光. 全年温热有助于促进双方的速度浸入的氯化物以及腐蚀速率 本身. 张预应力大家能够持久的长期在这种环境下,更可能要投资 高品质的混凝土具有低渗透氯离子. F&Q的后张委员 使用抗腐蚀的管道(如聚乙烯管道)将有助于制止进步的氯化物对钢绞线. 还必须慎重行事,以维护本地区的锚地,如封装的锚地不透水材料. 在除冰环境会前和会后张预应力结构具有敏感性腐蚀局部点的结构. 这可以在年底伸缩缝分割面板的方式,板 在关节分离桥沿线的桥梁,通过纵向空间相邻箱梁, 而在锚固区后张委员. 行动交通和环境导致联合失败 使除冰办法通过联合走上墩帽梁端的I型梁, 带上方箱梁. 安装水槽和雨水管进行除冰解决安然过甲板 而谨慎的联合检查和维修,可以帮助减少潜在的腐蚀这些结构. 使钢筋后张为要件,这是非常重要的一点是用稀砂浆全面概括了肌腱内的管道, 而没有潜在腐蚀性物质被补充到浆液.