| 摘要: |
| 研究了十三氟辛基三乙氧基硅烷（PFOTES）对水泥基材料工作性能、防覆冰性能和微观性能的影响，并通过热重-差示扫描量热分析（TG-DSC）和X射线衍射（XRD）探究了水泥水化产物的化学组成及物相组成.结果表明：掺入PFOTES能延长水泥净浆的凝结时间；低PFOTES掺量对减小冰附着力与增大接触角的效果较为明显，随着PFOTES掺量的进一步提升，冰附着力与接触角都基本保持不变；掺入PFOTES后，改性砂浆的吸水率减小、抗压强度降低、孔隙率增大；微观测试证明，PFOTES可以延缓水泥水化，但并未生成新的水化产物. |
| 关键词: 硅酸盐水泥 十三氟辛基三乙氧基硅烷 防覆冰性能 冰附着力 |
| DOI：10.3969/j.issn.1007-9629.2023.09.003 |
| 分类号:TV42+1.5 |
| 基金项目:国家自然科学基金资助项目（52179122） |
|
| Influence of PFOTES on Anti-icing Performance of Cementitious Materials and Its Mechanism |
|
CHEN Chuxin1,2, LIU Sifeng1,2,3
|
|
1.Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education，Tongji University，Shanghai 201804，China;2.School of Materials Science and Engineering，Tongji University，Shanghai 201804，China;3.Key Laboratory of Performance Evolution and Control for Engineering Structures of Ministry of Education， Tongji University，Shanghai 201804，China
|
| Abstract: |
| Influences of perfluorooctyltriethoxysilane（PFOTES） on the workability， anti-icing performance and microscopic properties of cementitious materials were studied.The chemical composition and physical phases of the cement hydration products were also investigated by thermogravimetric-differential scanning calorimeter（TG-DSC） and X-ray diffractometer（XRD）. The results show that the incorporation of PFOTES can prolong the setting time of cement paste. The impacts of low PFOTES content to the reduction of ice adhesion and increase of contact angle are more significant, and both ice adhesion and contact angle remain basically the same with further increase of PFOTES content. With PFOTES， the water absorption of the modified mortar reduces， the compressive strength decreases and the porosity increases. It is proved by microscopic tests that PFOTES delays the hydration of cement but does not produce new hydration products. |
| Key words: Portland cement perfluorooctyltriethoxysilane（PFOTES） anti-icing performance ice adhesion |
