Full
ZHANG Hongfei (1992-), male, Doctoral candidate. E-mail: phdzhanghf@163.com
Outline
The influence of cold CaCl2 solution on the setting behavior, strength development, mineralogical composition, microstructure, and chloride content of calcium sulphoaluminate (CSA) cement at -10 ℃ was investigated. The results show that there is a significant and persistent temperature peak in CSA cement pastes mixed with 16% and 28% cold CaCl2 solution, so CSA cement can hydrate continuously. The temperature peak retards from 90 min to 150 min as the solution concentration increases from 16% to 28%. The pastes with 16% CaCl2 solution set quickly and the compressive strength is high (initial setting time 15 min and final setting time 24 min, compressive strength 41.0 MPa at 1 day and 85.2 MPa at 28 days); while the pastes with 28% CaCl2 solution set slowly and the compressive strength is low (initial setting time 85 min and final setting time 155 min, compressive strength 24.3 MPa at 1 day and 57.7 MPa at 28 days). Ettringite is the primary hydration product and its morphology is needle in hydrated pastes with 16% CaCl2 solution. The Friedels salt turns to be dominant and the morphology is hexagonal plate in hydrated pastes with 28% CaCl2 solution. There is little binding chloride for 16% CaCl2 solution and 0.95% binding chloride for 28% CaCl2 solution. In the presence of CaCl2 solution, the CSA cement can hydrate continuously at -10 ℃. Furthermore, a shorter setting time and a higher strength can be obtained in CSA cement pastes mixed with 16%-20% CaCl2 solution.
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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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