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The roughness of the interface between new and old concrete is one of the key factors that affect its shear performance. In this paper, the roughness of the new and old concrete interface is characterized and quantified based on fractal theory. Different fractal dimension interfaces of new and old concrete random aggregate geometric models are established using the Monte Carlo method and aggregate grading theory. By simulating the mechanical behavior of rough interfaces using zero-thickness cohesive elements locally embedded in the model, the effects of mesh size, random distribution of aggregates, fractal dimension, normal pressure, and interface material parameters on the shear performance of rough interfaces between new and old concrete are analyzed. The results show that the model's mesh size and random distribution of aggregates have no significant effect on the shear performance of the interface between new and old concrete. As the fractal dimension increases, the interface shear strength first increases and then decreases, and the fractal dimension corresponding to the maximum shear strength decreases as the normal pressure increases. Under the same fractal dimension, the shear strength increases linearly with the normal pressure. The normal pressure has a more significant impact on the interface shear strength compared to the fractal dimension. As the fractal dimension increases, cracks are more likely to propagate deeper into the old concrete area, and increasing the strength and fracture energy of the new and old interface can effectively improve the shear performance of the interface.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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