Full
LIU Yiwei (1993-), male, Doctorial candidate. E-mail: yiweiliu@hnu.edu.cn
Outline
Slag, fly ash and silica fume were used as reactive aluminosilicate materials to prepare high-strength geopolymer. The influence of silica fume on the setting and hardening of geopolymer was particularly investigated based on the optimization of solid raw materials and activator compositions by a simplex centroid design method. The results show that silica fume can be used as a filler in the packing void between slag and fly ash particles, thus increasing the liquid film thickness due to the release of activator from the voids. This reduces the thixotropy of the paste as well as yield stress and plastic viscosity, thereby improving the flowability of geopolymer. A rapid dissolution of silica fume in a highly-alkaline activator increases the concentration of silicates and decreases alkalinity, leading to deceleration of the reactions of slag and fly ash and the formation of C-A-S-H gels with the prolongation of setting, the retardation of acceleration period, and the decrease of peak reaction heat rate and cumulative reaction heat. This affects the early reaction products and compressive strength development of geopolymer. The compressive strength of the resultant geopolymer reaches higher than 100 MPa with a good workability and reasonable setting time when slag content is more than 50%, fly ash is less than 30% and silica fume is less than 30%, indicating a possibility of producing geopolymer-based UHPC.
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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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