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基于真空荧光环氧浸渍染色法和数字图像处理技术,对经受不同程度冻融损伤的非引气混凝土、引气混凝土(含气量5%)试件基体内部不同类型的微裂纹(砂浆裂纹、过渡区微裂纹)的结构特征参数进行了详细定量分析。结果表明,随着冻融损伤程度的增大,无论引气混凝土还是非引气混凝土,其内部微裂纹的长度密度、面积密度和最大裂纹宽度等均在逐渐增大;冻融循环过程引起的微裂纹以过渡区微裂纹为主,砂浆微裂纹为辅;砂浆微裂纹和过渡区微裂纹的宽度并无明显差异。研究结果还显示,在同样的冻融损伤度下,引气混凝土基体微裂纹的密度要低于非引气混凝土。
Based on the vacuum fluorescent epoxy immersion dyeing method and digital image processing technology, different types of microcracks (mortar cracks, transitions Regional micro-cracks) structural characteristics of a detailed quantitative analysis. The results show that with the increase of the degree of freeze-thaw damage, both the length density, the area density and the maximum crack width of the microcracks in the air-entrained or non-air-entrained concrete are gradually increasing. The freezing and thawing cycles The microcracks are dominated by the microcracks in the transition zone, supplemented by the mortar microcracks. There is no significant difference between the microcracks in the mortar and the microcracks in the transition zone. The results also show that under the same freeze-thaw damage degree, the density of air-entrained concrete matrix microcracks is lower than that of non-air-entrained concrete.