Macro-micro crack and damage evolution characteristics of concrete: After the action of acidic drying-saturation cycle

材料科学 分形维数 复合材料 饱和(图论) 收缩率 声发射 岩土工程 分形 地质学 数学分析 数学 组合数学
作者
Hengze Yang,Xiaoran Wang,Enyuan Wang,Yue Song,Dong Chen,Yandong Zhang,Weizhen Liu
出处
期刊:Construction and Building Materials [Elsevier BV]
卷期号:411: 134601-134601 被引量:10
标识
DOI:10.1016/j.conbuildmat.2023.134601
摘要

Repeated saturation and drying of acidic mine water have a major influence on the mechanical properties and stability monitoring of artificial dams (concrete walls) in underground reservoirs. A uniaxial compression acoustic emission (AE) monitoring test was conducted to quantify the evolution characteristics of micro cracks in concrete. In addition, the evolution characteristics of macro cracks during sample failure were quantitatively analyzed by fractal dimension theory and Image-Pro. Finally, the damage constitutive model was established and the damage evolution law was studied. The results of the study showed that the percentage of micro shear cracks in dry samples exhibited a decreasing and then increasing trend during the loading stage before the uniaxial compressive strength (UCS). However, after the acidic drying-saturation cycle (ADSC), this percentage of concrete showed an increasing trend. As the number of drying-saturation cycles increases or the pH decreases, the fractal dimension, total length, and area of the macro cracks also increase. The damage constitutive model, based on ADSC and loading conditions, works well. After the ADSC, the concrete sample will have three damage stages. Additionally, the strain at entry into each stage increases. Expansion and shrinkage of hydration products and chemical damage due to ion exchange are the mechanisms that change the mechanical properties and the macro-micro crack evolution pattern of concrete after ADSC.
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