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高性能混凝土在氯盐侵蚀和冻融循环作用下的耐久性分析

冯博 刘青 钱永久

冯博, 刘青, 钱永久. 高性能混凝土在氯盐侵蚀和冻融循环作用下的耐久性分析[J]. 西南交通大学学报, 2023, 58(5): 1083-1089. doi: 10.3969/j.issn.0258-2724.20220035
引用本文: 冯博, 刘青, 钱永久. 高性能混凝土在氯盐侵蚀和冻融循环作用下的耐久性分析[J]. 西南交通大学学报, 2023, 58(5): 1083-1089. doi: 10.3969/j.issn.0258-2724.20220035
FENG Bo, LIU Qing, QIAN Yongjiu. Durability Analysis of High-Performance Concrete Under Chloride Salt Erosion and Freeze-Thaw Cycles[J]. Journal of Southwest Jiaotong University, 2023, 58(5): 1083-1089. doi: 10.3969/j.issn.0258-2724.20220035
Citation: FENG Bo, LIU Qing, QIAN Yongjiu. Durability Analysis of High-Performance Concrete Under Chloride Salt Erosion and Freeze-Thaw Cycles[J]. Journal of Southwest Jiaotong University, 2023, 58(5): 1083-1089. doi: 10.3969/j.issn.0258-2724.20220035

高性能混凝土在氯盐侵蚀和冻融循环作用下的耐久性分析

doi: 10.3969/j.issn.0258-2724.20220035
基金项目: 国家自然科学基金(51778532)
详细信息
    作者简介:

    冯博(1990—),男,博士研究生,研究方向为大跨度混凝土桥梁设计理论与工程实践,E-mail:279057786@qq.com

  • 中图分类号: U444

Durability Analysis of High-Performance Concrete Under Chloride Salt Erosion and Freeze-Thaw Cycles

  • 摘要:

    为研究海洋环境下高性能混凝土桥梁的耐久性,基于混凝土室内快速冻融试验,对高性能混凝土进行氯盐侵蚀与冻融循环耦合作用下的耐久性试验,分析混凝土在不同水胶比、粉煤灰掺量和含气量时的质量损失率和相对动弹性模量;并根据试验分析结果建立氯盐侵蚀与冻融循环耦合作用下的高性能混凝土质量预测衰减模型. 结果表明:水胶比对高性能混凝土的抗盐冻性能影响显著,混凝土抗盐冻性能随着水胶比增大而降低,建议水胶比不宜大于0.45;粉煤灰的加入会降低混凝土的抗盐冻性能,掺量较高时其抗盐冻性能难以达到满足要求,粉煤灰掺量不宜高于30%;随着含气量增加,混凝土抗盐冻性能呈现先提升后降低的变化规律,建议有考虑抗盐冻要求的混凝土其含气量在4.5%~5.5%内选取.

     

  • 图 1  不同水胶比试件的质量损失率变化

    Figure 1.  Variation of mass loss rate of specimens with different water-binder ratios

    图 2  不同粉煤灰掺量试件的质量损失率变化

    Figure 2.  Variation of mass loss rate of specimens with different fly ash contents

    图 3  不同含气量试件的质量损失率变化

    Figure 3.  Variation of mass loss rate of specimens with different gas contents

    图 4  不同水胶比试件的相对动弹性模量变化

    Figure 4.  Variation of relative dynamic elastic modulus of specimens with different water-binder ratios

    图 5  不同粉煤灰掺量试件的相对动弹性模量变化

    Figure 5.  Variation of relative dynamic elastic modulus of specimens with different fly ash contents

    图 6  不同含气量试件的相对动弹性模量变化

    Figure 6.  Variation of relative dynamic elastic modulus of specimens with different gas contents

    图 7  质量随冻融循环次数的变化

    Figure 7.  Variation of mass with freeze-thaw cycles

    表  1  试验混凝土配合比

    Table  1.   Concrete mix ratio in test

    编号影响因素混凝土原材用量/(kg•m−3
    wf/%q/%水泥粉煤灰碎石
    A10.35304.53961701985891047
    A20.45304.53081321986341128
    A30.55304.52521081986631179
    A40.4504.544001986341128
    A50.45104.5396441986341128
    A60.45504.52202201986341128
    A70.45303.53081321986341128
    A80.45305.53081321986341128
    下载: 导出CSV

    表  2  模型验证

    Table  2.   Model validation

    工况号试验工况剩余相对质量
    文献[1]计算结果本文计算结果相对误差/%
    工况 1w = 0.42,f = 30%,q = 4.8%,N = 200 次0.9650.9570.81
    工况 2w = 0.35,f = 30%,q = 4.8%,N = 250 次0.9750.9502.61
    工况 3w = 0.42,f = 0%,q = 4.8%,N = 275 次0.9780.9512.87
    工况 4w = 0.42,f = 10%,q = 4.8%,N = 100 次0.9900.9692.07
    工况 5w = 0.42,f = 30%,q = 4.8%,N = 300 次0.9720.9413.09
    工况 6w = 0.42,f = 30%,q = 5.5%,N = 250 次0.9630.8858.12
    工况 7w = 0.42,f = 30%,q = 3.8%,N = 50 次0.9810.9156.63
    下载: 导出CSV

    表  3  梁体试验与模型计算对比

    Table  3.   Comparison of beam test and model calculation

    N/次剩余相对质量
    梁体试验模型计算相对误差/%
    500.9960.9653.11
    1000.9930.9603.32
    1500.9880.9514.30
    2000.9830.9354.89
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-01-14
  • 修回日期:  2022-10-15
  • 网络出版日期:  2023-06-21
  • 刊出日期:  2023-01-12

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