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基于数字图像处理技术的引气混凝土冻融损伤定量评价

DOI: 10.7521/j.issn.0454-5648.2014.08.01

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Abstract:

对受冻混凝土建筑物进行维修加固的前提是对混凝土的冻融损伤程度进行科学合理的评价。提出一种基于真空荧光环氧浸渍技术和数字图像处理技术进行混凝土微裂纹量化分析的方法。对经受不同冻融循环劣化的引气混凝土试件进行了宏观力学性能测试和微裂纹量化分析,得到了混凝土试件基体中冻融微裂纹结构特征的演化规律,并比较了砂浆微裂纹和过渡区微裂纹结构特征参数的差异。结果表明在早期冻融损伤过程中,引气混凝土基体微裂纹的长度密度、面积密度和裂纹宽度均随冻融损伤度的增大而增大;过渡区微裂纹是冻融损伤微裂纹的主要部分;相对抗压强度、相对抗弯强度、相对轴拉强度和冻融损伤度与微裂纹密度之间均存在很强的相关关系;微裂纹量化分析技术有望发展成为评价混凝土冻融损伤的一个新方法。

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