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Size Distribution Model and Development Characteristics of Corrosion Pits in Concrete under Two Curing Methods

机译:两种养护方式下混凝土腐蚀坑的尺寸分布模型及发展特征

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摘要

In this paper, the effect of chloride ions on the development of corrosion pits in different reinforced concrete under different environmental conditions is studied. A fitting model for the size distribution of pits in seawater and sea-sand concrete (SSC) under different curing modes is established, and time-dependent fractal features are examined. Under wet/dry chloride cycles, the weight loss rate and corrosion rate of steel bars are higher, and the number of corrosion pits appears to increase on a small scale within 60-day. A majority of the corrosion is metastable pitting, and we propose a model to describe the size distribution of pitting in different periods. The good agreement between the proposed model and the available data illustrates that the proposed model is reliable and accurate. Macroscopic pitting occurs first in wet/dry chloride cycles. With the increase of concrete age, the size distribution of pits under wet/dry chloride cycles is uneven, and the pit sizes in submerged concrete tend to be equal.
机译:本文研究了氯离子对不同环境条件下不同钢筋混凝土中腐蚀坑的发展的影响。建立了不同养护方式下海水和海砂混凝土中坑的尺寸分布的拟合模型,并研究了随时间变化的分形特征。在湿式/干式氯化物循环下,钢筋的失重率和腐蚀率较高,并且腐蚀坑的数量在60天内呈小幅度增加。大多数腐蚀是亚稳态点蚀,我们提出了一个模型来描述不同时期点蚀的尺寸分布。所提出的模型与可用数据之间的良好一致性说明所提出的模型是可靠且准确的。宏观点蚀首先发生在湿/干氯化物循环中。随着混凝土龄期的增加,干湿氯化物循环下坑的尺寸分布是不均匀的,并且淹没混凝土中的坑尺寸趋于相等。

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