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The Accelerated Method for Estimating Corrosion of Reinforced Concrete Structure in Seawater

机译：海水中钢筋混凝土结构腐蚀的加速估算方法

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The corrosion of concrete for offshore structures is generally caused by the penetration ofchloride ion deriving from the salts in seawater. Up to now, lots of researches have been doneconcerning the corrosion of concrete by seawater and durability of concrete. However, theinvestigation for corrosion of reinforced concrete structure by seawater are relatively rare,because of the needs for long term tests (at least 3 to 5 years usually). The structures sited in theintertidal zone always accompany severer deterioration by seawater. Under such environmentalconditions, frequent wetting and drying will aggravate the effect of sulfate attack, while thecrystallization of sea salts in the concrete on evaporation may also contribute to expansiveforces. For these reasons above, the purpose of this paper is to study the corrosion of reinforcedconcrete structure in the intertidal zone by a accelerated method presented.The critical variables considered in this research include the temperature and concentration ofseawater. During the experimental period (1 year), the specimens were cured in wetting anddrying situation (for each circle, submerged by seawater for 24 hours and then drying at 70°C forthe following 24 hours), and this repeatedly cyclic procedures is to accelerate the corrosion ofreinforced concrete structure by seawater. According to the experimental results, the increasedconcentration and temperature of seawater would accelerate deterioration of concrete obviously.The duration of testing could be shortened about 75% by using the sweater with 10 times theconcentration. As the curing temperature increased, the corresponding strength concrete at earlierage would increase, and which could reduce the corrosion of reinforced concrete.
机译：海上结构混凝土的腐蚀通常是由于混凝土的渗透引起的。 氯化物离子源自海水中的盐。到目前为止，已经做了很多研究 关于海水对混凝土的腐蚀和混凝土的耐久性。但是，那 海水对钢筋混凝土结构腐蚀的研究相对较少， 因为需要长期测试（通常至少需要3到5年）。结构位于 潮间带总是伴随着海水的更严重恶化。在这样的环境下 在这种情况下，频繁的润湿和干燥会加剧硫酸盐侵蚀的效果，而 蒸发中混凝土中海盐的结晶也可能导致膨胀 势力。由于上述原因，本文的目的是研究钢筋的腐蚀 提出了一种潮间带混凝土结构的加速方法。 在这项研究中考虑的关键变量包括温度和浓度 海水。在实验期间（1年），样品在润湿和固化过程中固化。 干燥情况（每个圆，浸入海水中24小时，然后在70°C下干燥 接下来的24小时），而这种反复循环的程序是为了加速腐蚀 海水增强混凝土结构。根据实验结果，增加了 海水的浓度和温度会明显加速混凝土的劣化。 使用10倍的毛衣可以将测试时间缩短约75％。 专注。随着固化温度的升高，相应强度的混凝土在较早时 寿命会增加，这会减少钢筋混凝土的腐蚀。

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