CAO Zejie (2000-), male, Undergraduate. E-mail: 1910421311@hbut.edu.cn
To improve the mechanical properties of conventional sticky rice-lime mortar, high strength pregelatinized sticky rice-lime mortar (HPR-LM) was modified with a pregelatinized sticky rice via accelerated carbonation. The effects of mass fraction of pregelatinized sticky rice and water-solid ratio on the carbonation properties of HPR-LM were investigated. The results show that the maximum carbonation reaction degree of HPR-LM with sufficient water and larger porosity can be obtained at a water-solid ratio of 0.3. The change of conductivity and pH value of saturated Ca(OH)2 solution slows down, and the temperature increase of HPR-LM reduces due to the action of pregelatinized sticky rice, thus retarding the carbonation of HPR-LM. CaCO3 precipitation forms fusiform calcite on the template of molecular chain of pregelatinized sticky rice. The compressive strength of HPR-LM with 3% pregelatinized sticky rice is 56.8% higher than that of pure lime mortar, and calcite grain reaches the minimum size and the density of HPR-LM becomes the maximum value.
| 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 |