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In view of the problem of rapid durability deterioration and the service reliability reduction of concrete structure caused by saline ions erosion and freeze-thaw coupling in cold and drought irrigation area in northwest China, based on the rapid indoor freeze-thaw test, mechanical property change of clean water, 3%NaCl solution, 5%Na2SO4 solution was studied in the process of freeze-thaw. The freeze-thaw damage model was established to analyze the damage degree of relative dynamic elastic modulus of concrete block for three kinds of freeze-thaw mediums. The Weibull life prediction model was used to predict the life of test specimen. The results show that the mass loss, compressive strength and dynamic elastic modulus of the concrete mass damage sizes are 3%NaCl> 5%Na2SO4 > clean water; According to Weibull life prediction model, the fitting parameters b and C were obtained, and the correlation coefficient R2 is above 0.9; The prediction results of model life are consistent with the mechanical performance test results at different operating conditions; The mass loss, compressive strength and dynamic elastic modulus life prediction of concrete under three freeze-thaw mediums are clear water> 5% Na2SO4>3% NaCl. It can be seen that in the environment of freezing-melting and thawing erosion, $\text{SO}^{2-}_4$ erosion degree is greater than Cl- erosion, and the clean water erosion degree is minimal. The research results can provide a theoretical basis for the mechanical performance characteristics research and later maintenance of concrete in cold and drought irrigation areas.
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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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