Full
BAO Jiuwen (1989-), male, Ph.D., Associate Professor . E-mail: baojiuwen@qut.edu.cn
Outline
Alkali-activated concrete (AAC) prepared without cement with the performance of rapid hardening, high strength and good durability, is recognized as one of novel green building materials with a wide application potential. Chloride ingress into concrete to cause the process of steel corrosion is one of the main reasons to the durability failure of reinforced concrete structures, particularly exposed to marine cyclic drying-wetting zones. It is thus of great significance for the development of durability theory to conduct the chloride ingress resistance analysis of AAC under drying-wetting cycles. Compared with concrete C50, the effects of cyclic drying-wetting time ratio (i.e. 3.0∶1.0, 11.0∶1.0 and 85.4∶1.0) and exposure time (i.e. 30, 90 and 180 d) on the chloride ingress properties of AAC were investigated via a designed automatic experimental set-up of cyclic drying-wetting test. A theoretical model of chloride ingress into AAC under drying- wetting cycles was proposed for numerical calculation. The results show that the chloride content within AAC is obviously less than that in concrete C50. This is because AAC has a smaller porosity and a denser pore microstructure rather than concrete C50, thus exhibiting a better resistance to chloride ingress. The surface chloride concentration and apparent chloride diffusion coefficient of AAC first increase and then decrease as the cyclic drying-wetting time ratio increases. It is indicated that the numerical data of chloride profiles calculated by the proposed model of chloride transport into unsaturated concrete under various conditions of the drying-wetting cycles are in reasonable agreement with the experimental results.
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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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