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基于X-Ray CT扫描的钢筋混凝土锈蚀膨胀开裂试验研究
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Abstract:
为探究氯盐环境下混凝土中钢筋锈蚀导致混凝土开裂的细观机制，本文浇筑了带有钢筋的混凝土方块试件。试验过程中对试件进行单面浸泡，并施加恒定电流诱导钢筋锈蚀，当裂缝开展至浸泡溶液液面下降过快时停止通电，试验过程中记录混凝土表面裂缝的开展情况。在试验前后分别对试件进行一次X-Ray CT扫描，基于Avizo软件对扫描结果进行处理。通过Avizo对混凝土内的钢筋、孔隙和裂缝进行分割，有效地提取了试件中出现的宏观裂缝，统计了钢筋的锈蚀规律，分析了钢筋锈蚀导致的裂缝发展的细观尺度特征。
In this paper, to investigate the microscopic mechanism of steel corrosion-induced concrete cracking in chloride salt environments, concrete blocky specimens embedded by steel bars were cast. During the experiment, the specimens were soaked on one side and a constant current was applied to accelerate steel corrosion. When the cracks developed and the liquid level of the soaking solution dropped too quickly, the power was cut off. The crack propagation on the concrete surface was recorded during the experiment. X-Ray CT scanning was performed on the specimens before and after the experiment, and the scanned images were processed using Avizo software. Through Avizo, the steel bars, pores, and cracks inside the concrete were segmented, the macroscopic cracks that appeared in the specimens were effectively extracted, the corrosion rule of the steel bars was calculated, and the microscopic characteristics of the crack development caused by steel bar corrosion were analyzed.
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