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干湿循环作用下HPC-NC梯度柱氯盐侵蚀试验与寿命预测

孙胜江 杜睿智 葛佳辉 梅葵花 刘建忠

孙胜江, 杜睿智, 葛佳辉, 梅葵花, 刘建忠. 干湿循环作用下HPC-NC梯度柱氯盐侵蚀试验与寿命预测[J]. 交通运输工程学报, 2024, 24(5): 101-112. doi: 10.19818/j.cnki.1671-1637.2024.05.007
引用本文: 孙胜江, 杜睿智, 葛佳辉, 梅葵花, 刘建忠. 干湿循环作用下HPC-NC梯度柱氯盐侵蚀试验与寿命预测[J]. 交通运输工程学报, 2024, 24(5): 101-112. doi: 10.19818/j.cnki.1671-1637.2024.05.007
SUN Sheng-jiang, DU Rui-zhi, GE Jia-hui, MEI Kui-hua, LIU Jian-zhong. Chloride erosion test and life prediction of HPC-NC gradient column under dry-wet cycles[J]. Journal of Traffic and Transportation Engineering, 2024, 24(5): 101-112. doi: 10.19818/j.cnki.1671-1637.2024.05.007
Citation: SUN Sheng-jiang, DU Rui-zhi, GE Jia-hui, MEI Kui-hua, LIU Jian-zhong. Chloride erosion test and life prediction of HPC-NC gradient column under dry-wet cycles[J]. Journal of Traffic and Transportation Engineering, 2024, 24(5): 101-112. doi: 10.19818/j.cnki.1671-1637.2024.05.007

干湿循环作用下HPC-NC梯度柱氯盐侵蚀试验与寿命预测

doi: 10.19818/j.cnki.1671-1637.2024.05.007
基金项目: 

国家重点研发计划 2021YFB2601000

陕西省自然科学基础研究计划 2023-JC-YB-292

详细信息
    作者简介:

    孙胜江(1973-),男,山东荣成人,长安大学教授,工学博士,从事新材料桥梁结构研究

  • 中图分类号: U443.22

Chloride erosion test and life prediction of HPC-NC gradient column under dry-wet cycles

Funds: 

National Key Research and Development Program of China 2021YFB2601000

Natural Science Basic Research Program of Shaanxi Province 2023-JC-YB-292

More Information
  • 摘要: 为提高海洋潮汐与浪溅区钢筋混凝土结构受氯盐侵蚀的耐久性,提出了一种高性能混凝土(HPC)-普通混凝土(NC)梯度柱新型结构,设计了一种干湿循环试验方法进行氯盐侵蚀试验,研究其在不同试验参数影响下内部氯离子的传输规律;通过理论推导与拟合计算,建立了混凝土内部氯离子分布的简化计算模型,并验证了模型的合理性;基于所建简化模型,对设计的梯度柱进行了钢筋初锈时间的寿命预测。研究结果表明:采用功能梯度结构能有效适应潮汐与浪溅区结构上部受干湿循环作用、下部受长期浸泡作用的侵蚀特点,不同外掺剂组合作用抑制了氯离子的侵蚀,HPC内自由氯离子含量比NC降低了17.7%;表面氯离子含量随时间而增大,并有趋于稳定的趋势,符合指数分布特征;无论是长期浸泡作用还是干湿循环作用下,氯离子扩散系数均随作用时长增加而减小,其减小速率随时间增加而降低,最终趋于稳定;根据建立的氯离子分布简化计算模型得到的氯离子分布曲线,与试验及相关文献的氯离子分布曲线相对误差在12%以内;得到了60~80 mm保护层厚度下有无外掺剂时钢筋初锈的预警时间分别为41~85和26~47年,因此,掺加阻锈剂与侵蚀抑制剂可显著提高HPC-NC梯度柱的寿命。

     

  • 图  1  混凝土柱尺寸与配筋(单位: mm)

    Figure  1.  Sizes and reinforcements of concrete columns (unit: mm)

    图  2  试验方法

    Figure  2.  Test method

    图  3  氯离子侵蚀深度测试(单位:mm)

    Figure  3.  Erosion depth test of chloride ions (unit: mm)

    图  4  试件表面试验现象

    Figure  4.  Experimental phenomena of specimen surfaces

    图  5  试件自由氯离子含量分布

    Figure  5.  Distributions of free chloride ion content in specimens

    图  6  非梯度与梯度试件自由氯离子含量对比

    Figure  6.  Comparison of free chloride ion contents in gradient and non-gradient specimens

    图  7  不同外掺剂作用下HPC自由氯离子含量

    Figure  7.  Free chloride ion contents of HPC under different admixtures

    图  8  不同试验时长下自由氯离子含量

    Figure  8.  Free chloride ion contents at different test times

    图  9  下部长期浸泡表面氯离子含量拟合曲线

    Figure  9.  Fitting curves of chloride ion content on surface of lower part after long-term immersion

    图  10  不同试验时长试件氯离子扩散系数

    Figure  10.  Chloride ion diffusion coefficients of specimens with different test times

    图  11  计算模型验证

    Figure  11.  Calculation model verification

    图  12  钢筋初锈时间预测结果

    Figure  12.  Prediction results of initial rust time of steel bar

    表  1  HPC混凝土配合比

    Table  1.   Mix proportion of high performance concrete

    材料 水泥 粉煤灰 矿粉 石子 抑制剂 减水剂 阻锈剂
    用量/(kg·m-3) 282.0 94.0 94.0 155.0 739.0 1 022.0 6.1 18.8 6.1
    下载: 导出CSV

    表  2  C40 NC配合比

    Table  2.   Mix proportion of C40 normal concrete

    材料 水泥 减水剂
    用量/(kg·m-3) 487 185 533 1 245 6.8
    下载: 导出CSV

    表  3  HPC-NC梯度柱氯盐干湿循环试验工况

    Table  3.   Chloride dry-wet cycle test conditions of HPC-NC gradient columns

    试件编号 构件类型 阻锈剂 侵蚀抑制剂 干湿循环周期/d
    T1-1-1-120 梯度 120
    T2-1-0-120 梯度 120
    T3-0-0-120 梯度 120
    T4-1-0-120 梯度 120
    T5-0-0-120 梯度 120
    T6-0-0-90 梯度 90
    T7-0-0-60 梯度 60
    P0-0-0-120 普通 120
    下载: 导出CSV

    表  4  不同试验时长氯离子侵蚀深度

    Table  4.   Chloride ion erosion depths at different test times

    试件 各测点氯离子侵蚀深度/mm 平均深度/mm
    1 2 3 4 5 6 7
    T5-0-0-120 上部干湿循环 22.1 22.7 17.8 19.6 21.5 23.1 17.5 20.6
    下部长期浸泡 19.8 24.7 22.5 18.9 16.7 20.3 19.9 20.4
    T6-0-0-90 上部干湿循环 16.7 21.2 17.8 21.3 18.4 17.5 18.8 18.8
    下部长期浸泡 17.3 16.9 18.3 15.4 17.7 21.3 16.4 17.6
    T7-0-0-60 上部干湿循环 15.3 18.6 11.1 10.6 14.8 13.2 18.3 14.5
    下部长期浸泡 11.6 15.7 14.5 18.5 19.4 11.4 15.7 15.3
    下载: 导出CSV

    表  5  各试件氯离子含量峰值

    Table  5.   Peak chloride ion contents of each specimen  %

    试验条件 T1-1-1-120 T2-1-0-120 T3-0-0-120 T4-1-0-120 T5-0-0-120 T6-0-0-90 T7-0-0-60 P0-0-0-120
    下部长期浸泡 0.521 0.536 0.531 0.524 0.504 0.457 0.406 0.517
    上部干湿循环 0.511 0.518 0.561 0.522 0.549 0.467 0.426 0.621
    下载: 导出CSV

    表  6  扩散系数拟合结果

    Table  6.   Fitting results of diffusion coefficient

    试件 扩散系数/(10-6 mm2·s-1) 相关系数 标准差/(10-10 mm2·s-1)
    干湿循环 长期浸泡 干湿循环 长期浸泡 干湿循环 长期浸泡
    T7-0-0-60 2.21 4.55 0.982 3 0.990 2 3.06 1.59
    T6-0-0-90 1.94 3.99 0.973 9 0.993 3 6.98 1.48
    T5-0-0-120 1.78 3.57 0.979 1 0.992 3 4.67 1.47
    P0-0-0-120 4.18 3.54 0.971 0 0.972 6 10.00 5.74
    下载: 导出CSV

    表  7  不同保护层厚度下钢筋初锈预警时间

    Table  7.   Early warning times of initial rust of steel bars with different protective layer thicknesses

    保护层厚度/ mm 钢筋初锈时间/a
    无外掺作用技术基准 单阻锈剂作用HPC 双掺作用HPC
    60 26 35 41
    65 30 46 56
    70 35 54 64
    75 41 63 73
    80 47 71 85
    下载: 导出CSV
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  • 收稿日期:  2024-03-21
  • 网络出版日期:  2024-12-20
  • 刊出日期:  2024-10-25

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