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Outline
In order to solve the problem of large early autogenous shrinkage and high cracking risk of the UHPC, the effects of expansive agent and shrinkage reducing agent on the early autogenous shrinkage of the UHPC were studied. The effects of single expansive agent, single shrinkage reducing agent and their combination on the autogenous shrinkage of the UHPC were tested, and the microstructure of the products was analyzed. The results show that both expansive agent and shrinkage reducing agent can reduce the early autogenous shrinkage of the UHPC, and the shrinkage reducing effect of the combined admixture is more significant than that of the single admixture. When mixed alone, the more the amount of expansive agent is, the better the shrinkage reduction effect is. The optimal dosage is 8%, and the addition of 1.5% shrinkage reducing agent has the best effect on reducing autogenous shrinkage. When the expansive agent is added alone, the pores of the UHPC matrix are filled, the structure is denser, and the ability to resist shrinkage deformation is enhanced; When the shrinkage reducing agent is single-doped, the porosity and pore size of the matrix are smaller than those of the Blank group, and the autogenous shrinkage can be reduced under the appropriate dosage. When the expansive agent and the shrinkage reducing agent are mixed, the size of the AFt crystal is smaller than that of the single-doped expansive agent group but larger than that of the single-doped shrinkage reducing agent group, the structure is denser, indicating that the both of these play a synergistic role in shrinkage reduction.
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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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