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基于某水利枢纽工程混凝土力学性能对比研究

范向前 刘决丁 葛菲 汤雷 韩浩田

范向前,刘决丁,葛菲,等. 基于某水利枢纽工程混凝土力学性能对比研究[J]. 水利水运工程学报. doi:  10.12170/20211115001
引用本文: 范向前,刘决丁,葛菲,等. 基于某水利枢纽工程混凝土力学性能对比研究[J]. 水利水运工程学报. doi:  10.12170/20211115001
(FAN Xiangqian, LIU Jueding, GE Fei, et al. Comparative study on mechanical properties of concrete for a hydraulic complex project[J]. Hydro-Science and Engineering(in Chinese)) doi:  10.12170/20211115001
Citation: (FAN Xiangqian, LIU Jueding, GE Fei, et al. Comparative study on mechanical properties of concrete for a hydraulic complex project[J]. Hydro-Science and Engineering(in Chinese)) doi:  10.12170/20211115001

基于某水利枢纽工程混凝土力学性能对比研究

doi: 10.12170/20211115001
基金项目: 国家自然科学基金资助项目(52171270,51739008,51879168)
详细信息
    作者简介:

    范向前(1982— ),男,河南登封人,正高级工程师,博士,主要从事混凝土断裂研究。E-mail:xqfan@nhri.cn

  • 中图分类号: TV431

Comparative study on mechanical properties of concrete for a hydraulic complex project

  • 摘要: 为探讨大坝混凝土的相关力学性能及断裂特性,基于某水利枢纽工程提供的两种不同混凝土配合比(根据含水率的不同分别命名为C0.48和C0.43)及现场粗细骨料,开展混凝土梁三点弯曲试验,测定其坍落度、抗压强度、劈裂强度等相关力学性能参数,并分析了不同配合比对断裂面、起裂荷载与失稳荷载、临界有效裂缝长度及双K断裂韧度等断裂参数的影响。结果表明,C0.48混凝土的坍落度大于C0.43混凝土的坍落度,C0.48混凝土的抗压强度和劈裂强度均小于C0.43混凝土的;C0.48混凝土断裂面的粗骨料较C0.43混凝土断裂面凸出不明显;C0.43混凝土的起裂荷载与失稳荷载、临界有效裂缝长度及断裂韧度均比C0.48混凝土的要大,表明C0.43混凝土强度高,延性和韧性好。
  • 图  1  试验装置

    Figure  1.  The experimental device

    图  2  不同配合比混凝土坍落度

    Figure  2.  Slump of concrete with different mix proportions

    图  3  不同配合比混凝土的抗压强度

    Figure  3.  Compressive strength of concrete with different mix proportion

    图  4  不同配合比混凝土的劈裂强度

    Figure  4.  Splitting strength of concrete with different mix proportion

    图  5  混凝土断裂面

    Figure  5.  Fracture surface of concrete

    图  6  荷载-裂缝口张开位移曲线

    Figure  6.  Load-crack opening displacement curve

    图  7  起裂荷载与失稳荷载变化

    Figure  7.  Variation of the crack initiation load and instability load

    图  8  临界有效裂缝长度变化

    Figure  8.  Variation of critical effective crack length

    图  9  断裂韧度变化

    Figure  9.  Variation of fracture toughness

    表  1  混凝土配合比参数

    Table  1.   Concrete mix proportion parameters

    混凝土
    标号
    水胶比减水剂
    掺量/%
    引气剂
    掺量/%
    1m3混凝土材料用量/ kg
    水泥粉煤灰小石5~20中石20~40大石40~80减水剂引气剂
    C0.480.481.40.0693136585814714716282.710.12
    C0.430.431.40.0698160685074814816423.190.14
    下载: 导出CSV

    表  2  粉煤灰性质

    Table  2.   Test results of fly ash

    项目细度(45 μm方孔筛
    筛余)/%
    含水量/
    %
    需水量
    比/%
    烧失量/
    %
    SO3/
    %
    SiO2 /
    %
    Fe2O3/
    %
    Al2O3/
    %
    游离
    CaO/%
    碱含量/
    %
    活性
    指数/%
    实测值2.00.2944.951.0648.918.6421.900.071.3385
    GB/T1596—2017≤12≤1.0≤95≤5.0≤3.0///≤1.0/≥70
    下载: 导出CSV

    表  3  试验结果

    Table  3.   Test results

    试件Pini/kNPun/kNac/mm(aca0)/h$K_{{\text{IC}}}^{{\text{ini}}}$/(MPa·m1/2)$ K_{{\text{IC}}}^{{\text{un}}} $ / (MPa·m1/2)
    C0.48-11.112.02118.480.390.510.78
    C0.48-21.122.12122.560.410.520.79
    C0.48-31.222.22111.310.360.490.77
    C0.48-41.132.09116.170.380.540.75
    average value1.152.11117.130.390.520.77
    C0.43-11.414.3186.870.230.551.15
    C0.43-21.394.2991.450.260.541.16
    C0.43-31.524.5179.420.200.531.17
    C0.43-41.454.3983.910.220.571.14
    average value1.444.3885.410.230.551.16
    下载: 导出CSV
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