隔离墩病害原因分析
Analysis of the causes of the disease of the isolated pier
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 wet environment caused by rain and snow, sulfur dioxide in automobile exhaust gas, etc., erodes the surface of structural concrete under the action of water, which causes the structural concrete to loose and pulverize from the surface to the inside - this is the reason for the phenomenon of concrete surface pulverization and looseness that we often see 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 compounds dissolved in water and filter out of concrete, which damages the alkaline environment of concrete, reduces its pH value, and causes the loss of protection effect of concrete on reinforcement. Under the use of moisture and oxygen, the reinforcement will be rusted.
2.3 氯离子侵蚀：化冰盐中的氯化粪池模具 精密铸造 钢纤维  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 corrosion: chloride ions in deicing salt play a catalytic role in the process of steel bar corrosion in wet concrete environment: it is not consumed by itself, but it can greatly accelerate the corrosion speed of steel bars, so the impact on Corrosion of steel bars is continuous and fast.
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 interior, ice expands, and tension acts on the concrete, which leads to the breakage and falling of structural concrete from the surface to the inside.