Modeling corroded section configuration of steel bar in concrete structure
Modeling corroded section configuration of steel bar in concrete structure
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DOI：
10.1016/j.conbuildmat.2008.09.026
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发表时间：
2009-06-01
影响因子：
7.4
通讯作者：
Ji, Yongsheng
中科院分区：
文献类型：
--
作者：
Yuan, Yingshu;Ji, Yongsheng
混凝土中钢筋锈蚀引起的保护层开裂预测是钢筋混凝土结构耐久性的重要问题。钢筋锈蚀预测的一个基本问题是钢筋截面锈蚀部位的分布。腐蚀产物具有体积膨胀的特性，在混凝土中产生膨胀压力。目前，在分析腐蚀产物膨胀效应和建立模型时，一般采用沿钢筋周边沿着均匀腐蚀的假设。本文采用人工气候环境加速混凝土中钢筋锈蚀老化。讨论了钢筋与混凝土之间腐蚀产物层的扩展及其微观结构，揭示了混凝土中钢筋上腐蚀产物层的分布规律。腐蚀开裂前的分布，腐蚀产物仅分布在钢筋朝向混凝土保护层的半圆周上，呈半椭圆形分布。由于腐蚀产物的膨胀性，钢筋截面上腐蚀部位的分布规律与腐蚀产物层的分布规律成正比。为此，建立了锈蚀钢筋截面的形态模型。(C)2008爱思唯尔有限公司保留所有权利。
Predicting concrete cover cracking due, to steel bar corrosion in concrete is an important problem for durability of reinforced concrete structures. A basic question in the prediction is distribution of corroded part of steel bar section. The corrosion products have characteristic of volume expansions; that leads to expansive pressure in the concrete, At present, an assumption of uniform corroded pattern along the perimeter of the steel bar has been adopted for analyzing the effect of corrosion products expansion and building the model. In this paper, the steel bars in concrete were corroded under artificial climate environment for accelerated aging. The propagation of the corrosion products layer between steel bar and concrete and its microstructure are discussed; and then, the corrosion products distribution called corrosion products layer on the steel bar in concrete is revealed. The distribution before corrosion cracking; the corrosion products distribute on the half circumference of the steel bar facing the concrete cover only, and the distribution has the shape of a half ellipse. Because of expansive characteristic of corrosion products, the distribution pattern of the corroded part of the steel bar section is proportional to the distribution of the corrosion products layer. Therefore, the configuration model of corroded steel bar section is built. (C) 2008 Elsevier Ltd. All rights reserved.