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冻融环境下水工碾压混凝土单轴动态抗压性能研究

孙超伟 陈兴周 柴军瑞 卫田霖 马斌

孙超伟,陈兴周,柴军瑞,等. 冻融环境下水工碾压混凝土单轴动态抗压性能研究[J]. 水利水运工程学报. doi:  10.12170/20211118005
引用本文: 孙超伟,陈兴周,柴军瑞,等. 冻融环境下水工碾压混凝土单轴动态抗压性能研究[J]. 水利水运工程学报. doi:  10.12170/20211118005
(SUN Chaowei, CHEN Xingzhou, CHAI Junrui, et al. Research on the uniaxial compressive behavior of hydraulic roller compacted concrete subjected to freeze-thaw cycles[J]. Hydro-Science and Engineering(in Chinese)) doi:  10.12170/20211118005
Citation: (SUN Chaowei, CHEN Xingzhou, CHAI Junrui, et al. Research on the uniaxial compressive behavior of hydraulic roller compacted concrete subjected to freeze-thaw cycles[J]. Hydro-Science and Engineering(in Chinese)) doi:  10.12170/20211118005

冻融环境下水工碾压混凝土单轴动态抗压性能研究

doi: 10.12170/20211118005
基金项目: 国家自然科学基金资助项目(51909224,51979218,U1965107);陕西省基础研究计划项目(2020JQ-920);陕西省教育厅专项科研计划项目(19JK0910)
详细信息
    作者简介:

    孙超伟(1990—),男,陕西周至人,副教授,主要从事寒区水工结构安全与耐久性研究。 E-mail:chao_wei_106@126.com

  • 中图分类号: TV431+.1

Research on the uniaxial compressive behavior of hydraulic roller compacted concrete subjected to freeze-thaw cycles

  • 摘要: 为研究冻融循环和加载应变率对水工碾压混凝土抗压力学性能的影响,通过室内模拟碾压混凝土坝工程配合比和施工工艺制备碾压混凝土试件,开展不同冻融循环次数(0、25、50、75次)下的冻融试验和不同加载应变率(10−5/s、10−4/s、10−3/s、10−2/s)下的单轴压缩试验,分析碾压混凝土冻融表观特征及加载破坏形态,研究冻融循环次数和加载应变率对抗压力学性能的影响规律;并基于多元回归分析方法,构建抗压强度、峰值应变、应力-应变曲线与冻融循环次数和加载应变率的相关关系。结果表明:碾压混凝土抗压强度与加载应变率呈线性增强关系,与冻融循环次数满足二次多项式的劣化关系;峰值应变与加载应变率满足二次多项式的降低关系,与冻融循环次数满足二次多项式的增长关系。通过全应力-应变拟合曲线与试验曲线的比较发现,在研究的应变率和冻融循环次数范围内,二者吻合较好。
  • 图  1  不同冻融循环次数后表观特征

    Figure  1.  Appearance subjected to different freeze-thaw cycles

    图  2  不同冻融循环次数后加载破坏形态

    Figure  2.  Failure mode subjected to different freezing-thawing cycles

    图  3  不同应变率下加载破坏形态

    Figure  3.  Failure mode subjected to different loading strain rates

    图  4  质量损失率与冻融循环次数的关系曲线

    Figure  4.  Relationship between mass loss rate and freezing-thawing cycles

    图  5  相对动弹性模量与冻融循环次数的关系曲线

    Figure  5.  Relationship between relative dynamic elasticity modulus and freezing-thawing cycles

    图  6  不同冻融循环次数下fcd${\dot \varepsilon _{\text{d}}}$关系

    Figure  6.  Relationship between fcd and ${\dot\varepsilon _{\text{d}}}$ under different freezing-thawing cycles

    图  7  不同冻融循环次数下Dσ${\dot \varepsilon _{\text{d}}}/{\dot \varepsilon _{\text{S}}}$关系

    Figure  7.  Relationship between Dσ and ${\dot \varepsilon _{\text{d}}}/{\dot \varepsilon _{\text{S}}}$ under different freezing-thawing cycles

    图  8  不同应变率下fcNN关系

    Figure  8.  Relationship between fcN and N under different loading strain rates

    图  9  不同应变率下SσN关系

    Figure  9.  Relationship between Sσ and N under different strain rates

    图  10  不同冻融循环次数下$ {\varepsilon _{{\text{cd}}}} $${\dot \varepsilon _{\text{d}}}$关系

    Figure  10.  Relationship between$ {\varepsilon _{{\text{cd}}}} $and ${\dot \varepsilon _{\text{d}}}$ under different freezing-thawing cycles

    图  11  不同冻融循环次数下$ {{{\varepsilon _{{\text{cd}}}}} \mathord{\left/ {\vphantom {{{\varepsilon _{{\text{cd}}}}} {{\varepsilon _{{\text{cs}}}}}}} \right. } {{\varepsilon _{{\text{cs}}}}}} $$ {\mathop \varepsilon \limits^ \bullet _{\text{d}}}/{\mathop \varepsilon \limits^ \bullet _{\text{S}}} $关系

    Figure  11.  Relationship between $ {{{\varepsilon _{{\text{cd}}}}} \mathord{\left/ {\vphantom {{{\varepsilon _{{\text{cd}}}}} {{\varepsilon _{{\text{cs}}}}}}} \right. } {{\varepsilon _{{\text{cs}}}}}} $and $ {\mathop \varepsilon \limits^ \bullet _{\text{d}}}/{\mathop \varepsilon \limits^ \bullet _{\text{S}}} $ under different freezing-thawing cycles

    图  12  不同应变率下εcNN的关系

    Figure  12.  Relationship between εcN and N under different strain rates

    图  13  不同应变率下εcN/εc0N的关系

    Figure  13.  Relationship between εcN/εc0 and N under different strain rates

    图  14  不同应变率下全应力-应变曲线

    Figure  14.  Complete tress-strain curves under different strain rates

    图  15  不同冻融循环次数下全应力-应变曲线

    Figure  15.  Complete stress-strain curves under different freeze-thaw cycles

    表  1  Ⅱ级配碾压混凝土组成

    Table  1.   Roller compacted concrete mix proportion with gradation aggregates Ⅱ

    水/( kg·m−3)水泥/( kg·m−3)粉煤灰/( kg·m−3)水胶比砂率/%砂/( kg·m−3)粗骨料/( kg·m−3)外加剂/%
    88701060.5336721 5070.05
    下载: 导出CSV

    表  2  抗压强度结果

    Table  2.   Compression strength results

    冻融循环次数10−5/s10−4/s10−3/s10−2/s
    0次28.3730.6732.9735.20
    25次22.2324.5026.7628.37
    50次14.3715.6017.4019.00
    75次9.3311.0012.0012.83
    下载: 导出CSV

    表  3  不同冻融循环次数下的拟合参数

    Table  3.   Fitting parameters under different freezing-thawing cycles

    拟合参数0次25次50次75次
    k 0.080 54 0.095 59 0.105 28 0.134 05
    R2 1 0.999 92 0.999 89 0.999 31
    下载: 导出CSV

    表  4  不同应变率下的拟合参数

    Table  4.   Fitting parameters under different strain rates

    拟合参数10−5/s10−4/s10−3/s10−2/s
    k1 −0.009 9 −0.009 8 −0.009 0 −0.008 9
    k2 1.212×10−5 1.560×10−5 1.291×10−6 4.146×10−6
    R2 0.998 0.997 0.997 0.998
    下载: 导出CSV

    表  5  峰值应变试验结果

    Table  5.   Peak strain results

    冻融循环次数10−5/s10−4/s10−3/s10−2/s
    0次1.67×10−31.17×10−31.11×10−31.18×10−3
    25次1.71×10−31.27×10−31.20×10−31.25×10−3
    50次2.12×10−31.66×10−31.60×10−31.68×10−3
    75次2.52×10−32.06×10−31.99×10−32.08×10−3
    下载: 导出CSV

    表  6  不同冻融循环次数下的拟合参数

    Table  6.   Fitting parameters under different freezing-thawing cycles

    拟合参数0次25次50次75次
    l1−0.330 0−0.307 7−0.262 9−0.223 8
    l20.081 20.073 50.065 20.055 7
    R20.999 00.999 10.999 40.999 7
    下载: 导出CSV

    表  7  不同应变率下的拟合参数

    Table  7.   Fitting parameters under different strain rates

    拟合参数10−5/s10−4/s10−3/s10−2/s
    m10.001 70.002 20.002 20.001 4
    m27.871×10−51.076×10−41.141×10−41.188×10−4
    R20.999 30.999 10.998 80.998 4
    下载: 导出CSV

    表  8  全应力-应变曲线方程控制参数

    Table  8.   Control parameters of stress-strain equations

    冻融循环次数10−5/s10−5/s10−5/s10−5/s
    abcabcabcabc
    0次 0.256 1.007 1.820 0.202 1.308 1.997 0.158 1.625 2.192 0.108 1.945 2.512
    25次 −0.230 1.414 2.018 −0.066 1.717 2.171 0.018 2.044 2.344 0.036 2.325 2.623
    50次 0.136 1.144 2.215 0.273 1.332 2.344 0.345 1.741 2.497 0.333 1.788 2.802
    75次 0.468 0.886 2.412 0.576 0.994 2.518 0.641 1.278 2.649 0.644 1.290 2.963
    下载: 导出CSV
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