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风积沙混凝土盐冻多尺度劣化机制

李玉根 张慧梅 陈少杰 胡大伟 高炜

李玉根, 张慧梅, 陈少杰, 等. 风积沙混凝土盐冻多尺度劣化机制[J]. 复合材料学报, 2022, 40(0): 1-12
引用本文: 李玉根, 张慧梅, 陈少杰, 等. 风积沙混凝土盐冻多尺度劣化机制[J]. 复合材料学报, 2022, 40(0): 1-12
Yugen LI, Huimei ZHANG, Shaojie CHEN, Dawei HU, Wei GAO. Multi-scale degradation mechanism of aeolian sand concrete under salt-frost condition[J]. Acta Materiae Compositae Sinica.
Citation: Yugen LI, Huimei ZHANG, Shaojie CHEN, Dawei HU, Wei GAO. Multi-scale degradation mechanism of aeolian sand concrete under salt-frost condition[J]. Acta Materiae Compositae Sinica.

风积沙混凝土盐冻多尺度劣化机制

基金项目: 国家自然科学基金(51868075);榆林市科技局项目(2019-101-6);榆林高新区科技局项目(CXY-2021-10);榆林学院博士启动基金(22GK11)
详细信息
    通讯作者:

    李玉根,博士,副教授,硕士研究生导师,研究方向为混凝土耐久性 E-mail:liyugen@yulinu.edu.cn

  • 中图分类号: TU528.01

Multi-scale degradation mechanism of aeolian sand concrete under salt-frost condition

Funds: National Natural Science Foundation of China (51868075);Yulin Science and Technology Bureau (2019-101-6);Yulin High-tech Zone Science and Technology Bureau (CXY-2021-10);Yulin University HighLevel Talent Research Start-Up Fund (22GK11)
  • 摘要: 研究风积沙混凝土盐冻劣化规律,揭示劣化机理对其推广应用有重要指导意义。基于室内快速冻融试验及力学特性试验研究了风积沙混凝土盐冻劣化规律,结合扫描电镜(SEM)、核磁共振(NMR)、X射线单晶衍射(XRD)等表征技术及损伤力学理论从多尺度揭示了盐冻劣化机理。结果表明,风积沙影响混凝土的抗冻性,100%掺量风积沙混凝土强度低,但抗冻性最好。混凝土质量损失率及抗压强度损失率均随盐冻循环次数的增加而增大,相对动弹性模量随盐冻循环次数的增大而减小。风积沙混凝土的盐冻损伤是一个物理-化学过程,界面过渡区(ITZ)骨-浆剥离及附近砂浆基质开裂是导致其宏观物理、力学性能退化的主要原因。风积沙可以改变混凝土内部的孔隙结构及水分传输路径,进而影响孔隙饱和度及混凝土的抗盐冻性能。

     

  • 图  1  盐冻作用下风积沙混凝土表面剥落损伤过程

    Figure  1.  Apparent damage process of aeolian sand concrete under salt-frost conditions

    图  2  风积沙混凝土质量损失率与盐冻次数间的关系

    Figure  2.  Relationship between the mass loss rate and salt-frost number of aeolian sand concrete

    图  3  风积沙混凝土相对动弹性模量与盐冻次数间的关系

    Figure  3.  Relationship between the relative dynamic modulus and salt-frost number of aeolian sand concrete

    图  4  风积沙混凝土抗压强度损失率与盐冻次数间的关系

    Figure  4.  Relationship between the compressive strength loss rate and salt-frost number of aeolian sand concrete

    图  5  盐冻前后RS-C、30%AS-C及100%AS-C内部微细观结构

    Figure  5.  Microscopic structure of RS-C, 30%AS-C and 100%AS-C before and after salt-frost

    图  6  风积沙混凝土中NaCl晶体微观形貌

    Figure  6.  Micro-structure of NaCl crystal in aeolian sand concrete

    图  7  盐冻循环前后RS-C及100%AS-C水化产物XRD图谱

    Figure  7.  XRD patterns of the cement paste of RS-C and 100%AS-C before and after salt-frost

    图  8  盐冻作用前后RS-C及100%AS-C孔隙结构

    Figure  8.  Pore structure of RS-C and 100%AS-C before and after salt-frost

    图  9  风积沙混凝土损伤变量De(n)与盐冻次数n的关系

    Figure  9.  Relationship between the damage variable De(n) and salt-frost cycling number n of aeolian sand concrete

    图  10  风积沙混凝土盐冻剥落损伤机制示意图

    Figure  10.  Scaling damage mechanism diagram of aeolian sand concrete under salt-frost conditions

    图  11  风积沙混凝土盐冻内部损伤机制示意图

    Figure  11.  Internal damage mechanism diagram of aeolian sand concrete under salt-frost conditions

    图  12  风积沙混凝土试样初始孔隙含量分布

    Figure  12.  Initial pore size distribution ratio of the aeolian sand concrete samples

    表  1  试验用砂(沙)主要成分

    Table  1.   Main chemical composition of the used sand

    Sand nameSiO2/%Al2O3/%CaO/%Fe2O3/%MgO/%Others
    River sand79.576.42.977.881.071.91
    Aeolian sand75.858.024.799.221.150.97
    下载: 导出CSV

    表  2  风积沙混凝土配合比及28天抗压强度

    Table  2.   Mixture ratio and 28 days compressive strength of aeolian sand concrete

    SampleWater
    /
    (kg.m−3)
    Cement
    /
    (kg.m−3)
    Fly ash
    /
    (kg.m−3)
    River sand
    /
    (kg.m−3)
    Aeolian sand
    /
    (kg.m−3)
    Aggregate
    /
    (kg.m−3)
    Air-entraining
    agent/ (kg.m−3)
    28 d Compressive strength/MPa
    RS-C1903388457212150.02541.82
    30%AS-C19033884400.4171.612150.02544.58
    50%AS-C1903388428628612150.02539.05
    100%AS-C19033884057212150.02538.03
    Notes: C—Concrete; RS—River sand; AS—Aeolian sand; RS-C—Ordinary concrete; 30%AS-C, 50%AS-C and 100%AS-C—Aeolian sand concrete with the aeolian sand replacement rate of 30%, 50% and 100% by equal mass.
    下载: 导出CSV
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  • 收稿日期:  2022-03-30
  • 录用日期:  2022-05-22
  • 修回日期:  2022-05-04
  • 网络出版日期:  2022-06-16

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