SHAN Guangcheng (1992-), female. Master, Associate Engineer. E-mail: shanguangcheng@cnjsjk.cn
Alkyl sulfate surfactants with different hydrophobic chains (i.e., C8-C14) and surfactants with different anionic groups (i.e., sulfate, sulfonate and phosphate) were analyzed, and the effects of hydrophobicity and ionic groups on the surface activity, foam behavior and air-entraining performance in cement mortars were investigated. The results show that the more intense interfacial self-assembly behavior of surfactants can reduce the interfacial free energy and increase the surface activity, thus resulting in a greater foaming property of aqueous solutions and a higher air entraining performance in cement mortars. Sodium lauryl sulfate has the maximum interfacial self-assembly density, the minimum interfacial free energy, and the superior air entraining performance in aqueous solutions and cement mortars, as well as the optimum air-void adjustment performance of hardened cement mortars.
| 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 |