XI Xiang (1993-), male, Ph.D., Lecturer. E-mail: xiangxi93@hhu.edu.cn
Dielectric behavior pertains to the polarization of cement-based materials, in which the positive and negative charge centers are separated. Recent work on the dielectric behavior of common Portland cement-based materials in a low frequency regime were carried out, including the dependence of dielectric behavior on microstructures, hydration process, loadings, etc. This review represented the results of dielectric behavior of common Portland cement-based materials over the past decade and introduced the dielectric measurement method and the dependence of polarization on aggregates, water cement ratio, stress/strain, and temperature. It is indicated that some movable ions in pore solution dominate the dielectric behavior, in which the electric dipoles are in series. Aggregates and admixtures affect dielectric behavior due to relevant changes in microstructures. Heating and compression strengthen the dielectric behavior, while cooling and tension weaken the dielectric behavior. In addition, some related future research aspects were also prospected.
| 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 |