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隔离墩病害原因分析
隔离墩病害原因分析
Cause analysis of isolation pier disease
2.1 环境侵蚀:在雨雪导致的潮湿环境中,汽车尾气中的二氧化硫等,在水的作用下侵蚀结构混凝土表层,造成结构混凝土由表及里的疏松、粉化——这就是我们经常见到的浇筑多年的混凝土表面粉化、疏松等现象的原因。
2.1 environmental erosion: in the humid environment caused by rain and snow, sulfur dioxide in automobile exhaust erodes the surface of structural concrete under the action of water, resulting in the looseness and pulverization of structural concrete from the surface to the inside. This is the reason why we often see the phenomenon of concrete surface pulverization and looseness after pouring for many years.
2.2 碳化反应:二氧化碳、水和混凝土中的氢氧化钙结合生成溶于水的钙化合物并从混凝土中滤出,破坏了混凝土的碱性环境,降低其PH值,导致混凝土对钢筋的保护作用丧失,在潮气、氧气的作用下,导致钢筋锈蚀。
2.2 carbonation reaction: carbon dioxide, water and calcium hydroxide in concrete combine to form calcium compound dissolved in water and leach out from concrete, which destroys the alkaline environment of concrete and reduces its pH value, resulting in the loss of the protective effect of concrete on reinforcement and the corrosion of reinforcement under the action of moisture and oxygen.
2.3 氯离子侵蚀:化冰盐中的氯离子在潮湿的混凝土环境中,在钢筋锈蚀的过程中起到催化剂的作用:其本身并不被消耗,但却可以大大加速钢筋的锈蚀速度,所以对钢筋锈蚀的影响是持续且快速的。
2.3 chloride ion erosion: chloride ion in deicing salt acts as a catalyst in the process of reinforcement corrosion in wet concrete environment: it is not consumed, but it can greatly accelerate the corrosion speed of reinforcement, so the impact on reinforcement corrosion is continuous and rapid.
2.4 冻融破坏:水渗入混凝土内部,结冰膨胀,产生张力作用于混凝土,导致结构混凝土由表及里的破碎、脱落。
2.4 freeze thaw damage: water seeps into the concrete, freezes and expands, and produces tension acting on the concrete, resulting in the crushing and falling off of structural concrete from the outside to the inside.
2.5 钢筋锈蚀:环境侵蚀、氯离子侵蚀、冻融破坏在造成混凝土本身疏松、PH值降低的同时,还为钢筋提供了良好的锈蚀通道,丧失了对钢筋的保护功能,引发钢筋锈蚀。而钢筋锈蚀的直接危害就是导致了结构承载能力的下降,危及结构安全,同时锈蚀产物产生膨胀,导致钢筋保护层
2.5 reinforcement corrosion: environmental erosion, chloride ion erosion and freeze-thaw damage not only cause the looseness of concrete itself and the decrease of pH value, but also provide a good corrosion channel for reinforcement, thus losintuijian:baoding.75ix.cn tongshizi.89ix.com tongdingc.89ix.com
tongdiaor.71ix.com kongtiao.71ix.com www.pvcruanguan.com.cn www.zbjzsj.comg the protection function of reinforcement and causing reinforcement corrosion. The direct harm of steel corrosion is to reduce the bearing capacity of the structure and endanger the safety of the structure. At the same time, the corrosion products expand and lead to the reinforcement protection layer

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