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硅烷-纳米SiO2复合表面改性钢纤维超高性能混凝土参数优化及其力学性能

田杰夫 杨贞军 杨国君 姚勇

田杰夫, 杨贞军, 杨国君, 等. 硅烷-纳米SiO2复合表面改性钢纤维超高性能混凝土参数优化及其力学性能[J]. 复合材料学报, 2024, 42(0): 1-10.
引用本文: 田杰夫, 杨贞军, 杨国君, 等. 硅烷-纳米SiO2复合表面改性钢纤维超高性能混凝土参数优化及其力学性能[J]. 复合材料学报, 2024, 42(0): 1-10.
TIAN Jiefu, YANG Zhenjun, YANG Guojun, et al. Optimization of parameters and mechanical properties of silane-nano SiO2 composite surface modified steel fiber reinforced ultra-high performance concrete[J]. Acta Materiae Compositae Sinica.
Citation: TIAN Jiefu, YANG Zhenjun, YANG Guojun, et al. Optimization of parameters and mechanical properties of silane-nano SiO2 composite surface modified steel fiber reinforced ultra-high performance concrete[J]. Acta Materiae Compositae Sinica.

硅烷-纳米SiO2复合表面改性钢纤维超高性能混凝土参数优化及其力学性能

基金项目: 国家自然科学基金 (52173300)
详细信息
    通讯作者:

    杨贞军,博士,教授(二级),博士生导师,研究方向为复杂材料多尺度随机断裂损伤力学理论、计算模拟和实验验证 E-mail: zhjyang@whu.edu.cn

  • 中图分类号: TU51

Optimization of parameters and mechanical properties of silane-nano SiO2 composite surface modified steel fiber reinforced ultra-high performance concrete

Funds: National Natural Science Foundation of China (52173300)
  • 摘要: 为提升钢纤维增强超高性能混凝土(UHPFRC)的力学性能,提出一种采用氨基丙基三乙氧基硅烷(KH550)和纳米SiO2(Nano-SiO2)对钢纤维表面进行复合改性的新工艺。考虑乙醇和水的质量比(We:Wd)、KH550含量(wt%)、Nano-SiO2含量(wt%)和水浴温度(Twb)共4个参数对配比进行正交设计(L9(34))。首先筛选溶液稳定性较好的4种配比对纤维表面进行改性,然后使用FTIR和SEM分析涂层成分和形貌,最后根据UHPFRC试件28天的抗弯和抗压强度给出最优改性工艺参数。结果表明:(1)最优改性工艺参数为:We:Wd =3,KH550(wt%)=10%,Nano-SiO2(wt%)=0.5% 和Twb =80℃,其中We:Wd是影响溶液稳定性的主要因素;(2) FTIR显示存在Fe-O-Si特征峰,表明KH550和Nano-SiO2成功键合于钢纤维表面;(3) SEM显示最优改性工艺下涂层分布均匀,未见纳米SiO2 颗粒明显团聚;(4)掺入最优改性工艺处理后高强纤维的UHPFRC试件在1%、1.5%和2%纤维体积分数下的抗弯强度(28MPa、30.5MPa和37MPa)比未改性试件分别提升40.4%、28.5%和32.7%,抗压强度(133.3MPa、151.7MPa和163.9MPa)分别提升7.5%、8.3%和13%;(5)复合改性使1.5%和2%纤维体积分数下的试件跨中裂缝形态曲折复杂,显著增强了纤维-基体界面性能。

     

  • 图  1  钢纤维的复合改性处理步骤

    Figure  1.  Flow chart of steel fiber composite modification process

    图  2  力学性能试验

    Figure  2.  Mechanical tests

    图  3  C1~C9溶液稳定性试验

    Figure  3.  Stability test of C1-C9 solution

    图  4  不同涂层钢纤维的红外光谱图

    Figure  4.  FTIR of steel fibers with different coatings

    图  5  复合改性化学反应机理图

    Figure  5.  Chemical reaction mechanism diagram of composite modification

    图  6  纤维表面形貌

    Figure  6.  Surface morphology of steel fibers

    图  7  不同钢纤维含量下抗压试件的抗压强度值及荷载-位移曲线

    Figure  7.  Load-displacement curve and compressive strength of specimens with different steel fiber volume fraction

    图  8  不同钢纤维含量下抗压试件的抗压强度值及荷载-位移曲线

    Figure  8.  Load-deflection curve and bending strength of bending specimens with different steel fiber volume fraction

    图  9  抗弯试件的裂缝形态及局部放大图

    Figure  9.  Crack morphology and local magnification of bending specimens

    表  1  复合改性溶液的正交试验因素水平表

    Table  1.   Orthogonal test factor and level table of composite modified solution

    Level We:Wd KH550/wt% Nano-SiO2/wt% Twb/℃
    1 9:1 8 0.5 50
    2 6:1 10 1 65
    3 3:1 12 1.5 80
    Notes: We:Wd is mass ratio of alcohol to water; The mass fraction of KH550 and nano-SiO2 are both relative to the mass of the composite modified solution; Twb is the temperature of water bath.
    下载: 导出CSV

    表  2  复合改性溶液配比编号

    Table  2.   Name of composite modified solutions

    NameWe:WdKH550/wt%Nano-SiO2/wt%Twb/℃
    C19:180.550
    C29:110165
    C39:1121.580
    C46:18180
    C56:1101.550
    C66:1120.565
    C73:181.565
    C83:1100.580
    C93:112150
    下载: 导出CSV

    表  3  纤维增强混凝土的配比

    Table  3.   Ratio of steel fiber reinforced ultra-high performance concrete

    Name Cement/g Silica fume/g Quartz
    powder/g
    Quartz sand/g Water/g Water reducing agent/g Steel fiber
    (volume fraction)/g
    1 1200 134 320 586 290 10 60(1%)
    2 1200 134 320 586 290 10 90(1.5%)
    3 1200 134 320 586 290 10 120(2%)
    下载: 导出CSV

    表  4  UHPFRC小梁试件编号及数量

    Table  4.   Name and quantity of UHPFRC beam specimens

    NameQuantity per set
    Bending testCompression test
    BF-136
    HF-136
    CaF-136
    BF-1.536
    HF-1.536
    CaF-1.536
    BF-236
    HF-236
    CaF-236
    Notes: The naming rule of specimens: steel fiber type–volume fraction; a=2, 3, 8 and 9 (a is consistent with the subscript number of composite modified solution).
    下载: 导出CSV

    表  5  复合改性液稳定性正交试验结果

    Table  5.   Orthogonal test results of stability of composite modified solutions

    TestFactorTransition
    time/h
    We:WdKH550Nano-SiO2Twb
    C1111146
    C2122296
    C3133388
    C4212328
    C522312
    C6231242
    C7313216
    C83213128
    C9332190
    K1 avg76.7307246 
    K2 avg2475.37151.3
    K3 avg7873.335.381.3
    Range5445.335.335.3
    Optimal mixtureA3B2C1D3 
    Note: Kiavg −Average of level i (i = 1,2,3).
    下载: 导出CSV
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  • 收稿日期:  2024-03-27
  • 修回日期:  2024-06-13
  • 录用日期:  2024-06-22
  • 网络出版日期:  2024-07-10

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