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首页 > 过刊浏览>2023年第26卷第9期 >963-969. DOI:10.3969/j.issn.1007-9629.2023.09.003
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PFOTES对水泥基材料防覆冰性能的影响及机理
作者:
作者单位:

1.同济大学 先进土木工程材料教育部重点实验室，上海 201804;2.同济大学 材料科学与工程学院，上海 201804;3.同济大学 工程结构服役性能演化与控制教育部重点实验室，上海 201804

作者简介:

陈楚欣（1997—），女，浙江嘉兴人，同济大学硕士生.E-mail：2030623@tongji.edu.cn

通讯作者:

刘斯凤（1970—），女，湖北江陵人，同济大学副教授，博士生导师，博士.E-mail：lsf@tongji.edu.cn

中图分类号:

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
Author:
  • CHEN Chuxin 1,2

    CHEN Chuxin

    Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education，Tongji University，Shanghai 201804，China;School of Materials Science and Engineering，Tongji University，Shanghai 201804，China
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  • LIU Sifeng 1,2,3

    LIU Sifeng

    Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education，Tongji University，Shanghai 201804，China;School of Materials Science and Engineering，Tongji University，Shanghai 201804，China;Key Laboratory of Performance Evolution and Control for Engineering Structures of Ministry of Education， Tongji University，Shanghai 201804，China
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Affiliation:

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

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    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.

    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.

    图1 PFOTES的分子结构式Fig.1 Molecular structure formula of PFOTES
    图2 冰附着力测试装置Fig.2 Ice adhesion test benches
    图3 不同PFOTES掺量下水泥净浆的凝结时间Fig.3 Setting time of cement pastes with different PFOTES contents
    图4 不同PFOTES掺量下砂浆表面的冰附着力Fig.4 Ice adhesion on mortar surfaces with different PFOTES contents
    图5 不同PFOTES掺量下水泥净浆的表面接触角Fig.5 Contact angles of cement pastes with different PFOTES contents
    图6 PFOTES与水泥颗粒的反应Fig.6 Reaction of PFOTES with cement particles
    图7 不同PFOTES掺量下砂浆的吸水率Fig.7 Water absorption of mortars with different PFOTES contents
    图8 不同PFOTES掺量下水泥砂浆的力学性能Fig.8 Mechanical properties of mortars with different PFOTES contents
    图9 养护28 d后PFOTES改性水泥砂浆的孔结构分析Fig.9 Pore structure analysis of PFOTES modified cement mortars at 28 d
    图10 不同PFOTES掺量下水泥净浆的XRD图谱Fig.10 XRD patterns of cement pastes with different PFOTES contents
    图11 不同PFOTES掺量下水泥净浆的TG-DSC曲线Fig.11 TG-DSC curves of cement pastes with different PFOTES contents
    图12 不同PFOTES掺量下水泥净浆的CH含量Fig.12 CH content of cement pastes with different PFOTES contents
    表 2 不同PFOTES掺量下水泥净浆的黏附能Table 2 Adhesion energy of cement pastes with different PFOTES contents
    表 1 水泥的化学组成Table 1 Chemical composition of cement
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陈楚欣,刘斯凤.PFOTES对水泥基材料防覆冰性能的影响及机理[J].建筑材料学报,2023,26(9):963-969

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  • 收稿日期:2022-12-08
  • 最后修改日期:2023-03-02
  • 在线发布日期: 2023-10-10
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