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In the last decade, the fatigue damage of machine-made sand concrete caused by cyclic loading has gradually started to attract attention, but the test results are diverse and discrete due to the influence of test equipment, test conditions, and environment, etc. No uniform standard has been reached. To further analyze the fatigue performance of machine-made sand concrete and improve the accuracy of fatigue life prediction, this paper starts from the influencing factors of its mechanical properties—such as the content of stone powder, stress level, and machine-made sand replacement ratio, summarizes the underlying mechanisms and patterns, and analyzes the relationship between the static properties and fatigue life of concrete with the Aas–Jakobsen equation. An empirical fatigue life prediction formula is proposed, which considers the transformation relationships among the compressive, flexural, and tensile strengths of machine-made sand concrete. In addition, for the first time, this study conducted a microscopic analysis of the composition and microstructure of the interfacial transition zone (ITZ) and hydration products in concrete at different machine-made sand replacement rates, using scanning electron microscopy (SEM) and microhardness. Afterward, fatigue tests were carried out on concrete specimens at different replacement rates (0, 30 %, 70 %, and 100 %) of machine-made sand and the optimal replacement rate of machine-made sand for C30 concrete mix ratio was around 50%. Based on the experimental data, a fatigue life prediction model incorporating the machine-made sand replacement rates was developed. The proposed model avoids the need for extensive additional experiments and demonstrates greater applicability in engineering scenarios with significant variations in material composition or limited on-site experiment conditions.
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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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