隔離墩病害原因分析
Cause analysis of isolation pier disease
2.1 環境侵蝕：在雨雪導致的潮濕環境中，汽車尾氣中的二氧化硫等，在水的作用下侵蝕結構混凝土表層，造成結構混凝土由表及里的疏松、粉化——這就是我們經常見到的澆筑多年的混凝土表面粉化、疏松等現象的原因。
2.1 environmental erosion: in the wet 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 outside to the inside - this is the reason why we often see the pulverization and looseness of concrete surface after pouring for many years.
2.2 碳化反應：二氧化碳、水和混凝土中的氫氧化鈣結合生成溶于水的鈣化合物并從混凝土中濾出，破壞了混凝土的堿性環境，降低其PH值，導致混凝土對鋼筋的保護作用喪失，在潮氣、氧氣的作用下，導致鋼筋銹蝕。
2.2 carbonation reaction: carbon dioxide, water and calcium hydroxide in concrete combine to form water-soluble calcium compounds, which are filtered out from the concrete, damaging the alkaline environment of the concrete, reducing its pH value, resulting in the loss of the protective effect of the concrete on the reinforcement, and the corrosion of the reinforcement under the action of moisture and oxygen.
2.3 氯離子侵蝕：化冰鹽中的氯離子在潮濕的混蓋土網 防寒布 麻繩 油麻繩 麻刀 瀝青麻繩 靜壓造型線 自動澆注機 鑄鐵拍門 鋼制拍門 玻璃鋼拍門凝土環境中，在鋼筋銹蝕的過程中起到催化劑的作用：其本身并不被消耗，但卻可以大大加速鋼筋的銹蝕速度，所以對鋼筋銹蝕的影響是持續且快速的。
2.3 chloride ion corrosion: the chloride ion in the deicing salt acts as a catalyst in the process of reinforcement corrosion in the humid 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.