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极地低温下冻融作用对混凝土断裂性能的影响

谢剑 闫明亮 刘洋

谢剑, 闫明亮, 刘洋. 极地低温下冻融作用对混凝土断裂性能的影响[J]. 工程力学, 2023, 40(2): 202-212. doi: 10.6052/j.issn.1000-4750.2021.08.0656
引用本文: 谢剑, 闫明亮, 刘洋. 极地低温下冻融作用对混凝土断裂性能的影响[J]. 工程力学, 2023, 40(2): 202-212. doi: 10.6052/j.issn.1000-4750.2021.08.0656
XIE Jian, YAN Ming-liang, LIU Yang. EFFECT OF FREEZING AND THAWING ON FRACTURE PERFORMANCE OF CONCRETE AT POLAR LOW TEMPERATURE[J]. Engineering Mechanics, 2023, 40(2): 202-212. doi: 10.6052/j.issn.1000-4750.2021.08.0656
Citation: XIE Jian, YAN Ming-liang, LIU Yang. EFFECT OF FREEZING AND THAWING ON FRACTURE PERFORMANCE OF CONCRETE AT POLAR LOW TEMPERATURE[J]. Engineering Mechanics, 2023, 40(2): 202-212. doi: 10.6052/j.issn.1000-4750.2021.08.0656

极地低温下冻融作用对混凝土断裂性能的影响

doi: 10.6052/j.issn.1000-4750.2021.08.0656
基金项目: 国家自然科学基金项目(51978459)
详细信息
    作者简介:

    闫明亮(1993−),男,山东人,博士生,主要从事混凝土结构基本理论研究(E-mail: yanmingliang@tju.edu.cn)

    刘 洋(1991−),男,河南人,博士生,主要从事混凝土结构基本理论研究(E-mail: youngliu2017@163.com)

    通讯作者:

    谢 剑(1974−),男,河北人,教授,博士,博导,主要从事混凝土结构基本理论和加固技术研究与应用(E-mail: xiejian@tju.edu.cn)

  • 中图分类号: TU528

EFFECT OF FREEZING AND THAWING ON FRACTURE PERFORMANCE OF CONCRETE AT POLAR LOW TEMPERATURE

  • 摘要: 为研究混凝土在极地及严寒地区经历冻融循环作用后的耐久性能变化情况,该文通过慢冻法开展了84个三点弯曲梁的冻融循环及加载试验。试验以冻融循环下限温度(低至−80℃)、冻融循环次数、混凝土强度、混凝土类型为研究变量,对比分析了冻融循环前后混凝土基本力学性能和关键断裂参数的变化规律。研究结果表明:随着循环下限温度的降低以及循环次数的增加,混凝土的基本力学性能以及起裂韧度和断裂能均呈下降趋势,但失稳韧度以及特征长度则呈相反趋势,表明混凝土在经历冻融循环后阻裂的能力下降,但混凝土变形性能有明显改善;随着混凝土强度的提高,抗冻耐久性能有一定程度的提升;海水海砂混凝土经受冻融循环后断裂性能不低于普通混凝土;提出冻融损伤累积量的概念,可利用其反映断裂参数的变化情况和不同冻融工况的定量化比较。
  • 图  1  断裂试件几何尺寸图 /mm

    Figure  1.  Geometric size drawing of fracture specimen

    图  2  加载测量装置示意图

    Figure  2.  Schematic diagram of loading measuring device

    图  3  冻融循环后混凝土立方体抗压强度

    Figure  3.  Compressive strength of concrete cubes after freeze-thaw cycles

    图  4  冻融循环后混凝土立方体劈裂抗拉强度

    Figure  4.  Splitting tensile strength of concrete cubes after freeze-thaw cycles

    图  5  试件破坏形态

    Figure  5.  Damage of specimens

    图  6  起裂荷载确定方法

    Figure  6.  Determination of initial cracking load

    图  7  混凝土起裂韧度

    Figure  7.  Concrete initiation toughness

    图  8  混凝土失稳韧度

    Figure  8.  Concrete unstable toughness

    图  9  断裂能计算示意图

    Figure  9.  Schematic diagram of fracture energy calculation

    图  10  混凝土断裂能

    Figure  10.  Concrete fracture energy

    图  11  混凝土特征长度

    Figure  11.  Characteristic length of concrete

    图  12  降温曲线

    Figure  12.  Cooling curves

    图  13  断裂能损失率与冻融损伤累积量趋势线

    Figure  13.  Trend line of fracture energy loss rate and freeze-thaw damage accumulation

    表  1  试件详细设计参数

    Table  1.   Detailed design parameters of specimens

    编号混凝土类型设计强度温度下限/(℃)循环次数编号混凝土类型设计强度温度下限/(℃)循环次数
    C-2-0-0-1/2/3普通混凝土C20常温0C-6-0-0-1/2/3普通混凝土C60常温0
    C-2-3-1-1/2/3−305C-6-3-1-1/2/3−305
    C-2-3-2-1/2/3−3010C-6-3-2-1/2/3−3010
    C-2-6-1-1/2/3−605C-6-6-1-1/2/3−605
    C-2-6-2-1/2/3−6010C-6-6-2-1/2/3−6010
    C-2-8-1-1/2/3−805C-6-8-1-1/2/3−805
    C-2-8-2-1/2/3−8010C-6-8-2-1/2/3−8010
    C-4-0-0-1/2/3普通混凝土C40常温0S-4-0-0-1/2/3海水海砂混凝土S40常温0
    C-4-3-1-1/2/3−305S-4-3-1-1/2/3−305
    C-4-3-2-1/2/3−3010S-4-3-2-1/2/3−3010
    C-4-6-1-1/2/3−605S-4-6-1-1/2/3−605
    C-4-6-2-1/2/3−6010S-4-6-2-1/2/3−6010
    C-4-8-1-1/2/3−805S-4-8-1-1/2/3−805
    C-4-8-2-1/2/3−8010S-4-8-2-1/2/3−8010
    下载: 导出CSV

    表  2  混凝土配合比设计

    Table  2.   Mix proportion design of concrete /(kg/m3)

    设计强度等级水泥河砂/海砂石子水胶比
    C20280.5812.51077.0230.00.82
    C40460.0598.51111.5230.00.50
    S40460.0598.51111.5230.00.50
    C60638.9459.31071.8230.00.36
    下载: 导出CSV

    表  3  主要试验结果及断裂参数计算结果

    Table  3.   Main test results and fracture parameters calculation results

    试件编号抗压强度
    $ {f_{{\text{cu}}}} $/MPa
    抗拉强度
    $ {f_{\text{t}}} $/MPa
    起裂荷载
    $ {F_{\text{Q}}} $/kN
    峰值荷载
    $ {F_{\max }} $/kN
    裂缝张开口位移
    $ CMO{D_{\text{C}}} $/μm
    临界有效裂缝
    长度$ {a_{\text{c}}} $/m
    起裂韧度
    $ K_{{\text{IC}}}^{\text{Q}} $/(MPa·m1/2)
    断裂韧度
    $ K_{{\text{IC}}}^{\text{S}} $/(MPa·m1/2)
    断裂能
    $ G_{\text{F}}^{} $/(N/m)
    特征长度
    $ L_{{\text{ch}}}^{} $/mm
    C-2-0-0-1/2/3 33.7 3.6 0.748 2.271 51.33 0.060 0.308 1.326 199.83 546.7
    C-2-3-1-1/2/3 30.4 2.7 0.599 1.908 68.37 0.067 0.270 1.661 190.01 1383.4
    C-2-3-2-1/2/3 32.3 2.7 0.389 1.518 100.60 0.075 0.219 1.802 187.34 1265.8
    C-2-6-1-1/2/3 24.5 2.1 0.240 0.851 106.87 0.080 0.206 1.879 170.41 3309.4
    C-2-6-2-1/2/3 19.5 1.5 0.096 0.499 162.15 0.089 0.167 2.855 141.48 5957.5
    C-2-8-1-1/2/3 27.6 2.2 0.250 0.978 119.67 0.081 0.181 2.164 161.75 4381.1
    C-2-8-2-1/2/3 19.4 1.4 0.102 0.714 173.80 0.085 0.143 2.691 142.62 8535.9
    C-4-0-0-1/2/3 39.8 3.7 0.807 2.646 48.40 0.058 0.323 1.374 201.26 491.6
    C-4-3-1-1/2/3 36.9 4.0 0.729 2.194 64.80 0.065 0.306 1.564 196.82 518.6
    C-4-3-2-1/2/3 39.5 3.3 0.654 2.327 73.67 0.065 0.287 1.874 182.85 924.2
    C-4-6-1-1/2/3 33.4 2.9 0.360 1.017 97.77 0.079 0.236 2.191 178.36 2071.2
    C-4-6-2-1/2/3 29.3 2.3 0.279 0.886 123.37 0.082 0.189 2.319 172.79 3585.5
    C-4-8-1-1/2/3 34.1 3.0 0.417 1.555 102.40 0.076 0.226 2.081 173.16 2864.4
    C-4-8-2-1/2/3 26.2 2.0 0.265 0.888 133.70 0.083 0.188 1.963 163.17 4616.3
    C-6-0-0-1/2/3 49.6 4.6 0.886 3.351 47.13 0.054 0.347 1.481 215.25 395.2
    C-6-3-1-1/2/3 47.1 4.5 0.692 2.552 51.47 0.060 0.335 1.600 196.56 425.2
    C-6-3-2-1/2/3 47.6 4.5 0.888 2.637 52.00 0.059 0.321 1.484 192.06 357.9
    C-6-6-1-1/2/3 43.2 4.0 0.434 1.303 71.63 0.074 0.255 1.681 165.44 810.1
    C-6-6-2-1/2/3 41.4 3.7 0.318 0.953 111.77 0.082 0.218 2.383 156.54 1458.4
    C-6-8-1-1/2/3 47.3 4.0 0.414 1.280 78.00 0.075 0.226 2.149 165.30 1491.2
    C-6-8-2-1/2/3 40.3 3.5 0.321 1.141 110.57 0.081 0.205 2.310 151.65 1307.6
    S-4-0-0-1/2/3 43.1 4.4 0.889 2.946 49.65 0.056 0.344 1.434 198.12 903.9
    S-4-3-1-1/2/3 41.9 3.9 0.841 2.638 53.50 0.060 0.334 1.508 196.68 596.3
    S-4-3-2-1/2/3 42.6 4.0 0.612 2.110 74.25 0.068 0.299 2.021 182.83 925.0
    S-4-6-1-1/2/3 39.2 3.4 0.548 1.652 91.77 0.074 0.259 2.099 178.29 1271.3
    S-4-6-2-1/2/3 36.0 3.1 0.296 1.052 122.93 0.082 0.196 2.380 170.50 1513.9
    S-4-8-1-1/2/3 41.5 3.6 0.428 1.715 101.00 0.075 0.229 2.114 170.97 1233.3
    S-4-8-2-1/2/3 34.7 2.8 0.266 1.115 126.23 0.081 0.189 2.194 166.90 2293.7
    注:表中数据为三个平行试件的平均值。本文后续分析中均按照混凝土实际强度进行计算分析,C20、C40、C60等仅起到分组编号的作用。
    下载: 导出CSV
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  • 收稿日期:  2021-08-23
  • 录用日期:  2021-11-18
  • 修回日期:  2021-11-15
  • 网络出版日期:  2021-11-18
  • 刊出日期:  2023-02-01

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