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吸水性微胶囊/水泥基材料的多尺度界面表征及其自修复效果

师树青 毛倩瑾 陈佳艺 张璐 王子明 崔素萍

师树青, 毛倩瑾, 陈佳艺, 等. 吸水性微胶囊/水泥基材料的多尺度界面表征及其自修复效果[J]. 复合材料学报, 2024, 42(0): 1-10.
引用本文: 师树青, 毛倩瑾, 陈佳艺, 等. 吸水性微胶囊/水泥基材料的多尺度界面表征及其自修复效果[J]. 复合材料学报, 2024, 42(0): 1-10.
SHI Shuqing, MAO Qianjin, Chen Jiayi, et al. Multiscale interfacial characterization and self-healing effect of cementitious materials containing absorbent microcapsules[J]. Acta Materiae Compositae Sinica.
Citation: SHI Shuqing, MAO Qianjin, Chen Jiayi, et al. Multiscale interfacial characterization and self-healing effect of cementitious materials containing absorbent microcapsules[J]. Acta Materiae Compositae Sinica.

吸水性微胶囊/水泥基材料的多尺度界面表征及其自修复效果

基金项目: 国家自然科学基金项目-创新研究群体项目 (51621003)
详细信息
    通讯作者:

    毛倩瑾,博士,副教授,硕士生导师,研究方向为混凝土外加剂、自修复混凝土 E-mail: maoqj@bjut.edu.cn

  • 中图分类号: TU599; TB332

Multiscale interfacial characterization and self-healing effect of cementitious materials containing absorbent microcapsules

Funds: National Natural Science Foundation of China - Innovative Research Group Project (51621003)
  • 摘要: 针对以海藻酸钙为壳、环氧树脂E-51为核的吸水性微胶囊(SA)与水泥基体界面结合力较弱的问题,利用硅烷偶联剂对SA微胶囊表面进行修饰处理,改善其与水泥基体的界面结合,以提升自修复效果。采用SEM、显微硬度和拉拔试验等分析测试手段分别从微观、介观到宏观尺度分析界面结合情况,并通过砂浆试件损伤修复后的抗压强度、抗水渗透性的恢复率来评价自修复效果。研究结果表明,SA经偶联剂KH792修饰处理后,与水泥基体的界面结合更为紧密,界面处显微硬度提高了159%,界面粘结强度提高了67%;掺加4wt%(水泥质量)SA的砂浆,荷载损伤修复后抗压强度恢复率103%,水压损伤修复后抗渗性恢复率达到118%。硅烷偶联剂表面修饰显著提升了SA与水泥基体的界面结合,水泥基材料自修复效果增强。

     

  • 图  1  环氧树脂E-51@海藻酸钙微胶囊(SA)制备示意图

    Figure  1.  Preparation diagram of epoxy resin E-51@calcium alginate absorbent microcapsule (SA)

    图  2  “三明治”夹心结构试件示意图

    Figure  2.  "Sandwich" sandwich structure specimen diagram

    图  3  (a) 环氧树脂@海藻酸钙微胶囊(SA)形貌SEM图;(b) 去除核环氧树脂E-51的SA内部SEM图

    Figure  3.  (a) SEM image of calcium alginate@epoxy resin (SA) morphology; (b) SEM image of the internal SA of nuclear epoxy resin E-51

    图  4  硅烷偶联剂修饰后微胶囊表面EDS面扫:(a) KH-1扫描位置;(b) KH-1表面N元素;(c) KH-1表面Si元素; (d) KH-2扫描位置;(e) KH-2表面N元素;(f) KH-2表面Si元素; (g) KH-3扫描位置;(h) KH-3表面N元素;(i) KH-3表面Si元素

    Figure  4.  EDS surface scan images of microcapsules modified with silane coupling agent: (a) KH-1 scanning position; (b) KH-1 surface N elements; (c) KH-1 surface Si elements; (d) KH-2 scanning position; (e) KH-2 surface N elements; (f) KH-2 surface Si elements; (g) KH-3 scanning position; (h) KH-3 surface N elements; (i) KH-3 surface Si elements

    图  5  微胶囊与水泥基体界面结合处形貌SEM图:(a) SA-100X;(b) KH-1-100X;(c) KH-2-100X;(d) KH-3-100X

    Figure  5.  SEM image of the interface between microcapsule and cement matrix: (a) SA-100X; (b) KH-1-100X; (c) KH-2-100X; (d) KH-3-100X

    图  6  SA和KH-3组样品不同位置处的维氏硬度:(a) 测试位置示意图;(b) 维氏硬度

    Figure  6.  Vickers hardness of SA and KH-3 samples at different locations: (a) Schematic diagram of test locations; (b) Vickers hardness

    图  7  掺SA、KH-1、KH-2和KH-3样品的界面粘结强度

    Figure  7.  Interfacial bonding strength of samples doped with SA, KH-1, KH-2 and KH-3

    图  8  硅烷偶联剂KH792结构式

    Figure  8.  Silane coupling agent KH792 structural formula

    图  9  水解处理法修饰微胶囊反应示意图

    Figure  9.  Schematic diagram of the hydrolysis treatment method for modifying microcapsules

    图  10  直接处理法修饰微胶囊反应示意图

    Figure  10.  Schematic diagram of the direct treatment method for modifying microcapsules

    图  11  对照组砂浆、掺SA砂浆和掺KH-3砂浆自修复前后的抗压强度

    Figure  11.  Compressive strength of control group mortar, SA mortar and KH-3 mortar before and after self-repair

    图  12  对照组砂浆、掺SA砂浆和掺KH-3砂浆试样自修复前后的抗水渗透性

    Figure  12.  Water permeability resistance of mortar, SA mortar and KH-3 mortar samples in control group before and after self-repair

    表  1  实验所用P.I 42.5硅酸盐水泥的化学成分及熟料矿物组成

    Table  1.   Chemical composition and clinker mineral composition of P.I 42.5 Portland cement used in the experiment

    ConstituteSiO2Fe2O3CaOMgOSO3Na2Oeqf-CaOC2SC3SC3AC4AF
    Content/wt%22.153.1264.762.980.650.570.919.0159.426.369.48
    下载: 导出CSV

    表  2  实验所用 ISO 标准砂粒径分布

    Table  2.   ISO standard sand particle diameter distribution used in the experiment

    Square hole side length/ mmCumulative screening margin/%Square hole side length/ mmCumulative screening margin/%
    2.000.567±5
    1.67±50.1687±5
    1.033±50.0899±1
    下载: 导出CSV

    表  3  偶联剂处理微胶囊的工艺编号

    Table  3.   Processing code for coupling agent-treated microcapsules

    Serial number Process mode mKH792mSA
    KH-1 Hydrolysis method 1∶10
    KH-2 Direct method 1∶1
    KH-3 Direct method 2∶1
    下载: 导出CSV
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  • 收稿日期:  2024-04-23
  • 修回日期:  2024-06-06
  • 录用日期:  2024-06-14
  • 网络出版日期:  2024-06-29

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