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基于X-CT的高温后再生保温混凝土损伤分析

苗艳春 张玉 SELYUTINANina SMIRNOVIvan 邓克招 李贝贝 都思哲 刘元珍 马钢

苗艳春, 张玉, SELYUTINA Nina, 等. 基于X-CT的高温后再生保温混凝土损伤分析[J]. 复合材料学报, 2022, 39(6): 2829-2843. doi: 10.13801/j.cnki.fhclxb.20210716.007
引用本文: 苗艳春, 张玉, SELYUTINA Nina, 等. 基于X-CT的高温后再生保温混凝土损伤分析[J]. 复合材料学报, 2022, 39(6): 2829-2843. doi: 10.13801/j.cnki.fhclxb.20210716.007
MIAO Yanchun, ZHANG Yu, SELYUTINA Nina, et al. Damage analysis of meso-scale recycled aggregate thermal insulation concrete based on X-CT after high temperature[J]. Acta Materiae Compositae Sinica, 2022, 39(6): 2829-2843. doi: 10.13801/j.cnki.fhclxb.20210716.007
Citation: MIAO Yanchun, ZHANG Yu, SELYUTINA Nina, et al. Damage analysis of meso-scale recycled aggregate thermal insulation concrete based on X-CT after high temperature[J]. Acta Materiae Compositae Sinica, 2022, 39(6): 2829-2843. doi: 10.13801/j.cnki.fhclxb.20210716.007

基于X-CT的高温后再生保温混凝土损伤分析

doi: 10.13801/j.cnki.fhclxb.20210716.007
基金项目: 国家自然科学基金(51808375);Russian Foundation for Basic Research(21-51-53008);国家自然科学基金国际合作与交流项目(5201101735);亚热带建筑科学重点实验室基金(2019ZB23)
详细信息
    通讯作者:

    张玉,博士,副教授,硕士生导师,研究方向为混凝土结构材料及建筑节能材料 E-mail:zhangyu03@tyut.edu.cn

  • 中图分类号: TU528

Damage analysis of meso-scale recycled aggregate thermal insulation concrete based on X-CT after high temperature

  • 摘要: 火灾的发生往往会导致混凝土材料微细观结构的损伤劣化,体现在水化物分解、孔隙结构粗化、热开裂和水汽压力升高诱致开裂等,继而导致材料宏观力学性能及耐久性的下降。轻质高强、内部多孔、高热稳定的玻化微珠(GHB)的细观调控功能可实现混凝土耐高温性能的提升。为了研究受高温作用的再生保温混凝土(RATIC)内部细观结构及裂纹变化特征,本研究首先对高温作用后的RATIC开展了立方体抗压强度试验和CT扫描试验,之后利用基于改进的自适应阈值法和区域生长法的图像分割算法,建立了基于真实结构的RATIC细观模型,分析了不同GHB及再生骨料(RCA)掺量的RATIC试件随温度变化时其内部微裂纹的孕育、萌生、发展及贯通过程。并对RATIC破坏形态与CT结果进行了对比分析。研究结果表明:GHB对裂缝的延伸有显著阻断作用,为蒸汽压提供了释放通道,缓解了砂浆区域、孔隙边界处的开裂,减缓了热量的传播,提升了混凝土抗热致损伤性能。

     

  • 图  1  玻化微珠(GHB)的外部形态 (a) 和内部结构 (b)[8]

    Figure  1.  Appearance (a) and micro-structure (b) of glazed hollow beads (GHB)[8]

    图  2  试验流程图

    Figure  2.  Flow chart of test

    图  3  不同温度下RATIC中截面CT扫描图像

    Figure  3.  CT scanning images of RATIC at different temperatures

    图  4  蒸汽压作用机制

    Figure  4.  Mechanism of vapor pressure

    σvp—Steam pressure stress; ft—Axial tension strength

    图  5  不同温度下RATIC试件的残余抗压强度与GHB含量 (a) 和RCA取代率 (b) 的关系

    Figure  5.  Residual compressive strength of RATIC at elevated temperatures varying with GHB content (a) and RCA content (b)

    图  6  不同温度下RATIC试件的相对残余抗压强度与GHB含量(a)和RCA取代率(b)的关系

    Figure  6.  Relative residual compressive strength of RATIC at elevated temperatures varying with GHB content (a) and RCA content (b)

    图  7  灰度拉伸前后的RATIC CT图像灰度直方图

    Figure  7.  Gray histograms of RATIC CT images before and after gray expanding

    图  8  改进的基于阈值法和区域生长法的图像分割方法算法实现图

    Figure  8.  Algorithm flow chart of the improved threshold segmentation method based on threshold method and region growing method

    图  9  RATIC细观模型的建立

    Figure  9.  Establishment of finite element analysis model of RATIC

    图  10  不同时间下受火阶段和自然冷却阶段的RATIC温度场分布

    Figure  10.  Temperature field distribution of RATIC in the fire stage and the natural cooling stage

    图  11  不同受火时间下RATIC试件的温度应力分布(600℃)

    Figure  11.  Temperature stress distributions of RATIC specimens at different fire time (600℃)

    图  12  不同受火温度下RATIC全截面达到受火温度和降温到室温所需的时间

    Figure  12.  Time required for the full section of RATIC to reach the fire temperature and cool down to room temperature at different temperatures

    图  13  不同受火温度下RATIC的最大温度应力随时间的变化

    Figure  13.  Maximum temperature stresses of RATIC specimens change with time at different fire temperatures

    表  1  骨料基本性能

    Table  1.   Properties of aggregates

    Material
    Density/(g·cm−3)Percentage/%
    Bulk densityApparent densityWater absorption at 24 hWater contentCrushing indexLoss of massSediment percentage
    Sand 1.48 2.67 3.70 0.80 5.8 2.57
    NCA 1.45 2.65 2.40 1.13 9.1 4.7 0.62
    RCA 1.16 2.48 5.35 1.56 14.6 8.9 0.58
    Notes: NCA—Natural coarse aggregate; RCA—Recycled coarse aggregate.
    下载: 导出CSV

    表  2  GHB基本性能

    Table  2.   Material properties of GHB

    MaterialBulk density/
    (kg·m−3)
    Thermal conductivity/
    (W·(m·K)−1)
    Cylindrical compress
    strength/kPa
    Percentage/%
    Water absorption
    at 24 h
    Volume floating
    rate
    Surface vitrified
    close cell content
    GHB 130 0.03 23 207 90 89
    下载: 导出CSV

    表  3  再生保温混凝土(RATIC)配合比

    Table  3.   Mixture proportions of recycled aggregate thermal insulation concrete (RATIC)

    GroupMix
    detail
    RatioCement content/
    (kg·m−3)
    Water/
    binder
    Sand/
    cement
    Recycled aggregate/
    cement
    Natural aggregate/
    cement
    Water reducer/
    %
    Silica
    fume/
    %
    Glazed hollow
    bead/concrete
    mixture mass/%
    Group 1
    R100-G0 0.52 1.07 2.40 0 1.18 7.44 0 484
    R100-G70 0.52 1.07 2.40 0 1.18 7.44 4.89 484
    R100-G100 0.52 1.07 2.40 0 1.18 7.44 6.84 484
    Group 2
    R0-G100 0.52 1.07 0 2.50 1.18 7.44 6.72 484
    R50-G100 0.52 1.07 1.20 1.25 1.18 7.44 6.78 484
    R100-G100 0.52 1.07 2.40 0 1.18 7.44 6.84 484
    Notes: R—Recycled coarse aggregate; G—Glazed hollow beads; In Rx-Gy, x—Volume substitution rate; y—Volume content.
    下载: 导出CSV

    表  4  常温下(20℃) RATIC各细观组分的热工参数和力学参数

    Table  4.   Thermal parameters and mechanical parameters of meso-scale constituents of RATIC at room temperature (20℃)

    Constitutionρ/(kg·m−3)k/(W·(m·K)−1)c/(J·(kg·K)−1)α/℃−1fc/MPaft/MPaEc/MPaP
    NCA 2 600 3.100 798[29] 7.00×10−6 100.5 10.0 6.50×104 0.15
    N-CPM 2 350 1.900[30] 813[28] 1.45×10−5 40.0[30] 4.0[30] 3.00×104 0.22
    O-CPM 2 300 1.950 850 1.50×10−5 36.0 3.6 2.85×104 0.22
    N-ITZ 2 300 2.100 906[30] 2.00×10−5 28.0 2.8 2.10×104 0.20
    O-ITZ 2 280 2.000 860 1.95×10−5 25.0 2.5 2.00×104 0.20
    GHB 140 0.032 1 050 3.00×10−5 2.40×104 0.23
    Notes: ρ—Density; k—Thermal conductivity; c—Specific heat; α—Coefficient of thermal expansion; fc —Compressive strength; ft —Tensile strength; Ec— Elasticity modulus; P—Poisson's ratio; N-CPM—New cement paste and mortar; O-CPM—Old cement paste and mortar;
    N-ITZ—New interface transition zone; O-ITZ—Old interface transition zone.
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-05-25
  • 修回日期:  2021-07-06
  • 录用日期:  2021-07-07
  • 网络出版日期:  2021-07-19
  • 刊出日期:  2022-06-01

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