Experimental and Numerical Investigation of Corrosion-Induced Cover Cracking in Reinforced Concrete Structures
Experimental and Numerical Investigation of Corrosion-Induced Cover Cracking in Reinforced Concrete Structures
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DOI：
10.1061/(asce)0733-9445(2009)135:4(376
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发表时间：
2009-04
期刊：
影响因子：
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通讯作者：
D. Val;L. Chernin;M. Stewart
中科院分区：
文献类型：
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作者：
D. Val;L. Chernin;M. Stewart
在本文中，腐蚀引起的裂纹萌生和扩展的实验和数值模拟研究，特别强调量化的比例的腐蚀产物中消散的混凝土孔隙和裂缝，从而减少周围的混凝土上施加的压力腐蚀产物。首先，从加速腐蚀试验的钢筋混凝土板的裂纹萌生和扩展的实验数据。有限元模型的结果和实验数据的比较是用来估计渗透到混凝土孔隙和裂缝，这是一个重要的参数预测腐蚀的开始和传播的腐蚀产物的量。结果表明，在混凝土开裂前，腐蚀产物渗透到混凝土孔隙中的量比其他研究者得到的要大。该文件还表明，腐蚀产物不会完全填充混凝土中的腐蚀引起的裂缝后，立即开始作为裂缝逐渐填充随着时间的推移，混凝土覆盖越厚，它将需要更长的时间来完全填充裂缝。
In the paper corrosion-induced crack initiation and propagation are investigated experimentally and numerically, with particular emphasis on quantifying the proportion of corrosion products that are dissipated within the concrete pores and cracks, thus reducing the pressure exerted by corrosion products on the surrounding concrete. Initially, experimental data on crack initiation and propagation obtained from accelerated corrosion tests of reinforced concrete slabs are presented. A comparison of finite-element model results and experimental data is used to estimate the amount of corrosion products penetrating into concrete pores and cracks, which is an essential parameter for prediction of corrosion initiation and propagation. It was found that the amount of corrosion products penetrating into the concrete pores before crack initiation is larger than that obtained by other researchers. The paper also showed that corrosion products do not fully fill corrosion-induced cracks in concrete immediately after their initiation as the cracks are being filled gradually over time and the thicker the concrete cover the longer it will take to fully fill a crack.