Full
Outline
To solve the problem of excessive drying shrinkage in alkali-activated materials (AAM), by introducing a CaSO4-MgO composite expansion agent (CM) to regulate the drying shrinkage behavior of alkali-activated copper slag-ground granulated blastfurnace slag mortar (CS-AAM), the influence of the mass ratio of CaSO4 to MgO in CM on the workability, hydration process, microstructure evolution, and macroscopic mechanical properties of CS-AAM was systematically investigated, along with the synergistic shrinkage reduction mechanism of CM. The results indicate that adjusting the mass ratio of CaSO4 to MgO in CM can effectively control the fluidity and setting time of CS-AAM paste. When the mass ratio of CaSO4 to MgO is 2∶1, the 28-day compressive strength reaches its peak at 74.1 MPa, representing a 4.4% increase compared to the control group, while the 180-day drying shrinkage rate decreases by 40.9%. Microscopically, the total porosity is reduced, resulting in the most compact structure. As the proportion of CaSO4 decreases, the amount of ettringite formation decreases, while the formation of brucite increases accordingly. Therefore, by adjusting the mass ratio of CaSO4 to MgO within the range of 3∶0 to 1∶2 can achieve the optimal comprehensive performance of CS-AAM.
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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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