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硫酸盐侵蚀下混杂纤维/橡胶混凝土力学性能及微观结构

刘雨姗 庞建勇

刘雨姗, 庞建勇. 硫酸盐侵蚀下混杂纤维/橡胶混凝土力学性能及微观结构[J]. 复合材料学报, 2024, 41(4): 2055-2064. doi: 10.13801/j.cnki.fhclxb.20230803.001
引用本文: 刘雨姗, 庞建勇. 硫酸盐侵蚀下混杂纤维/橡胶混凝土力学性能及微观结构[J]. 复合材料学报, 2024, 41(4): 2055-2064. doi: 10.13801/j.cnki.fhclxb.20230803.001
LIU Yushan, PANG Jianyong. Mechanical properties and microstructure of hybrid fiber reinforced rubber concrete under sulfate attack[J]. Acta Materiae Compositae Sinica, 2024, 41(4): 2055-2064. doi: 10.13801/j.cnki.fhclxb.20230803.001
Citation: LIU Yushan, PANG Jianyong. Mechanical properties and microstructure of hybrid fiber reinforced rubber concrete under sulfate attack[J]. Acta Materiae Compositae Sinica, 2024, 41(4): 2055-2064. doi: 10.13801/j.cnki.fhclxb.20230803.001

硫酸盐侵蚀下混杂纤维/橡胶混凝土力学性能及微观结构

doi: 10.13801/j.cnki.fhclxb.20230803.001
基金项目: 安徽理工大学高层次引进人才科研启动基金(2022yjrc77)
详细信息
    通讯作者:

    庞建勇,博士,教授,博士生导师,研究方向为水泥混凝土材料 E-mail: pangjyong@163.com

  • 中图分类号: TB332;TU278.3

Mechanical properties and microstructure of hybrid fiber reinforced rubber concrete under sulfate attack

Funds: Scientific Research Foundation for High-level Talents of Anhui University of Science and Technology (2022yjrc77)
  • 摘要: 为研究混杂纤维/橡胶混凝土(HF/RC)的抗硫酸盐侵蚀性能,对比分析硫酸盐环境下干湿循环240次内,普通混凝土(NC)和HF/RC的表观现象、质量损失、超声参数、抗压强度损失等性能指标劣化过程,采用SEM及XRD微观表征手段分析硫酸盐/干湿循环前后试件微观形貌及物相组成。结果表明:随硫酸盐/干湿循环次数增加,NC、HF/RC试件的质量、抗压强度呈先增后减的趋势,超声参数与抗压强度、耐蚀系数具有密切相关性;侵蚀初期SO4 2−与胶凝物质反应填充原生孔隙,基体密实度提高。侵蚀过程胶凝材料不断被消耗,基体在硫酸钠反复结晶的物理侵蚀及硫酸盐化学侵蚀的共同作用下出现空隙和孔洞。但橡胶颗粒和混杂纤维可阻断裂缝扩展继而减缓SO4 2−扩散,抑制膨胀性产物生成,延缓结晶应力诱发的表层裂纹发育。硫酸盐侵蚀各阶段HF/RC的劣化程度均优于NC,经240次硫酸盐/干湿循环后,NC、HF/RC的耐蚀系数分别为69.00%、78.87%。

     

  • 图  1  橡胶颗粒表观形貌

    Figure  1.  Appearance of rubber particles

    图  2  纤维表观形貌

    Figure  2.  Appearance of fibers

    图  3  普通混凝土(NC)和混杂纤维/橡胶混凝土(HF/RC)不同硫酸盐侵蚀阶段质量变化

    Figure  3.  Mass fraction of normal concrete (NC) and hybrid fiber reinforced rubber concrete (HF/RC) exposed to different corrosion time

    图  4  NC和HF/RC不同硫酸盐侵蚀阶段表观形貌

    Figure  4.  Apparent phenomenon of NC and HF/RC exposed to different corrosion time

    图  5  NC和HF/RC不同硫酸盐侵蚀阶段抗压强度及耐蚀系数Kf

    Figure  5.  Compressive strength and corrosion resistance coefficient Kf of NC and HF/RC exposed to different corrosion time

    图  6  NC和HF/RC硫酸盐侵蚀时间与超声参数的拟合关系

    Figure  6.  Fitting relationship between ultrasound parameters and corrosion time of NC and HF/RC

    VR—Relative velocity; n—Corrosion time; R2—Coefficient of determination; D—Damage degree

    图  7  NC和HF/RC超声参数与耐蚀系数的拟合关系

    Figure  7.  Fitting relationship between ultrasound parameters and corrosion resistance coefficient of NC and HF/RC

    图  8  NC和HF/RC不同硫酸盐侵蚀阶段荷载-位移曲线

    Figure  8.  Load-displacement curves of NC and HF/RC exposed to different corrosion time

    图  9  NC和HF/RC不同硫酸盐侵蚀阶段受压破坏模式

    Figure  9.  Failure pattern diagram of NC and HF/RC exposed to different corrosion time

    图  10  HF/RC试件破裂面

    Figure  10.  Fracture surface of HF/RC

    图  11  NC不同硫酸盐侵蚀阶段微观形貌

    Figure  11.  Micro-structures of NC exposed to different corrosion time

    图  12  硫酸盐侵蚀混凝土XRD图谱

    Figure  12.  XRD patterns of concrete with sulfate attack

    C-S-H—Hydrate calcium silicate

    图  13  硫酸盐侵蚀混凝土的微观形貌

    Figure  13.  Micro-structures of concrete exposed to sulfate attack

    图  14  硫酸盐侵蚀240天HF/RC试件的微观形貌

    Figure  14.  Micro-structures of HF/RC exposed to sulfate attack for 240 days

    表  1  纤维基本物理力学性能参数

    Table  1.   Basic physical and mechanical parameters of fibers

    Property Length/mm Tensile strength/MPa Elastic modulus/GPa Elongation at break/% Density/(g·cm−3)
    Basalt fiber 18 3000-4800 90-110 1.5-3.2 2.63
    Polyvinyl alcohol fiber 12 1600-2500 40-80 6.0 1.20
    下载: 导出CSV

    表  2  混凝土配合比

    Table  2.   Mixing proportions of concrete

    Group
    number
    Rubber
    particle
    size/mm
    Rubber
    particle/
    (kg·m−3)
    Basalt
    fiber/
    (kg·m−3)
    Polyvinyl
    alcohol
    fibers/(kg·m−3)
    Sand/
    (kg·m−3)
    Limestone/
    (kg·m−3)
    Cement/
    (kg·m−3)
    Water
    reducer/
    (kg·m−3)
    Water/
    (kg·m−3)
    0# 885 885 440 3.8 200
    1# 0-0.85 46.73 2.63 1.29 796.5 885 440 3.8 200
    2# 0-0.85 93.46 5.26 2.58 708 885 440 3.8 200
    3# 0-0.85 140.18 7.89 3.87 619.5 885 440 3.8 200
    4# 1-3 46.73 5.26 3.87 796.5 885 440 3.8 200
    5# 1-3 93.46 7.89 1.29 708 885 440 3.8 200
    6# 1-3 140.18 2.63 2.58 619.5 885 440 3.8 200
    7# 3-6 46.73 7.89 2.58 796.5 885 440 3.8 200
    8# 3-6 93.46 2.63 3.87 708 885 440 3.8 200
    9# 3-6 140.18 5.26 1.29 619.5 885 440 3.8 200
    下载: 导出CSV

    表  3  正交试验结果

    Table  3.   Results of orthogonal experiments

    Group numberCompressive strength/MPaSplitting tensile strength/MPaFlexural strength/MPa
    0#38.563.735.60
    1#32.813.895.65
    2#32.024.055.71
    3#24.763.825.66
    4#36.394.516.28
    5#30.014.175.51
    6#27.193.525.28
    7#31.834.396.03
    8#30.223.885.15
    9#24.583.345.24
    下载: 导出CSV
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  • 收稿日期:  2023-06-14
  • 修回日期:  2023-07-10
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