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PVA-钢纤维对高强再生骨料混凝土梁抗弯性能的影响

牛海成 高锦龙 李博涵 范玉辉 王永贵

牛海成, 高锦龙, 李博涵, 等. PVA-钢纤维对高强再生骨料混凝土梁抗弯性能的影响[J]. 复合材料学报, 2022, 39(11): 5499-5511. doi: 10.13801/j.cnki.fhclxb.20211110.003
引用本文: 牛海成, 高锦龙, 李博涵, 等. PVA-钢纤维对高强再生骨料混凝土梁抗弯性能的影响[J]. 复合材料学报, 2022, 39(11): 5499-5511. doi: 10.13801/j.cnki.fhclxb.20211110.003
NIU Haicheng, GAO Jinlong, LI Bohan, et al. Effect of PVA-steel fiber on the flexural performance of high-strength recycled aggregate concrete beams[J]. Acta Materiae Compositae Sinica, 2022, 39(11): 5499-5511. doi: 10.13801/j.cnki.fhclxb.20211110.003
Citation: NIU Haicheng, GAO Jinlong, LI Bohan, et al. Effect of PVA-steel fiber on the flexural performance of high-strength recycled aggregate concrete beams[J]. Acta Materiae Compositae Sinica, 2022, 39(11): 5499-5511. doi: 10.13801/j.cnki.fhclxb.20211110.003

PVA-钢纤维对高强再生骨料混凝土梁抗弯性能的影响

doi: 10.13801/j.cnki.fhclxb.20211110.003
基金项目: 国家自然科学基金(U1904188);河南省自然科学基金(182300410247)
详细信息
    通讯作者:

    牛海成,博士,副教授,研究方向为钢与混凝土组合结构 E-mail: niuhch@126.com

  • 中图分类号: TU375.1

Effect of PVA-steel fiber on the flexural performance of high-strength recycled aggregate concrete beams

  • 摘要: 为研究纤维对高强再生骨料混凝土梁抗弯性能的影响,以粗骨料类型、纤维种类、纤维掺入方式和纤维体积掺量为变化参数完成了8根混凝土梁的四点弯曲试验,分析了不同参数对高强再生骨料混凝土梁破坏特征、裂缝宽度、挠度、开裂荷载、抗弯承载力和延性的影响。试验结果表明:掺入纤维的高强再生骨料混凝土梁和未掺入纤维的高强再生骨料混凝土梁破坏特征与高强天然骨料混凝土梁相似,均经历了弹性阶段、带裂缝工作阶段和破坏阶段;高强再生骨料混凝土梁的开裂荷载、刚度和变形性能较高强天然骨料混凝土梁均有所降低,且裂缝较宽,挠度较大;掺入聚乙烯醇/钢纤维有效抑制了裂缝的产生和进一步扩展,提高了开裂荷载,增强了变形性能;单掺聚乙烯醇纤维可使开裂荷载和延性显著提高,但抗弯承载力基本没有变化;单掺钢纤维与混掺聚乙烯醇-钢纤维均使再生骨料混凝土梁力学性能有所提高;与未掺纤维的再生骨料混凝土梁相比,混掺0.1vol%聚乙烯醇-1.5vol%钢纤维后,开裂荷载、抗弯承载力和延性分别提高了60.0%、4.2%和20.1%;利用规程对纤维增强再生骨料混凝土梁进行抗弯承载力计算,计算结果与实测结果吻合较好。

     

  • 图  1  纤维类型

    Figure  1.  Types of fiber

    图  2  FRHRACB的基本尺寸

    ϕ—Steel bar symbol; L—Span of beams

    Figure  2.  Dimensions of FRHRACB

    图  3  FRHRACB典型试块破坏形态

    Figure  3.  Typical failure modes of FRHRACB specimens

    图  4  FRHRACB加载装置示意图

    P—Load

    Figure  4.  Schematic diagram of loading device of FRHRACB

    图  5  FRHRACB典型破坏形态

    Figure  5.  Typical failure modes of FRHRACB

    图  6  FRHRACB荷载-挠度曲线

    Figure  6.  Load-deflection curves of FRHRACB

    图  7  FRHRACB荷载-应变曲线

    Figure  7.  Load-strain curves of FRHRACB

    图  8  FRHRACB跨中截面应变发展规律

    Figure  8.  Mid-span cross-section strain of FRHRACB

    图  9  梁正截面抗弯承载力计算简图

    Mfu—Flexural bearing capacity of normal section of fiber recycled aggregate concrete beam; ffu—Axial compressive strength of fiber recycled aggregate concrete; x—Height of the equivalent rectangular stress pattern in the compression zone; h0—Effective height of the section; h—Section height; as—Distance from the resultant point of the tensile reinforcement to the tensile edge; fy—Yield strength of longitudinal reinforcement in tension zone; As—Cross-sectional area of longitudinal reinforcement in tension zone; ftfu—Tensile strength of the equivalent rectangular stress pattern of concrete in the tensile zone; xt—Equivalent rectangular stress pattern height of the tension zone

    Figure  9.  Calculation diagram of flexural bearing capacity of beams

    表  1  粉煤灰和矿粉物理性能指标

    Table  1.   Physical properties of fly ash and mineral powder

    ProgramDensity/
    (kg·m−3)
    Bulk density/
    (kg·m−3)
    Specific
    surface area/
    (cm2·g−1)
    Ignition loss/%
    Fly ash 2180 1124 3400 1.78
    Mineral
    powder
    2980 1440 3850 4.09
    下载: 导出CSV

    表  2  纤维物理性能

    Table  2.   Physical and mechanical properties of fibers

    Fiber
    types
    $ {d}_{\mathrm{f}} /$μml/mmν/(g·cm−3)$ {f}_{\mathrm{f}\mathrm{y}} /$MPa$ {E}_{\mathrm{f}} $/GPa$ {\delta }_{\mathrm{f}} $/%
    PVA 15 27 1.27 1060 29 6.00
    Steel 600 19 7.80 1500 220 8.00
    Notes: $ {d}_{\mathrm{f}} $—Fiber diameter; l—Fiber length; ν—Fiber density; $ {f}_{\mathrm{f}\mathrm{y}} $—Tensile strength of fiber; $ {E}_{\mathrm{f}} $—Elastic modulus of fiber; $ {\delta }_{\mathrm{f}} $—Fiber elongation.
    下载: 导出CSV

    表  3  混凝土配合比

    Table  3.   Mix ratio of concrete

    Replacement
    ratio of RCA/%
    Material composition/(kg·m−3)
    CementFine aggregateNCARCABase waterAdditional waterFly ashMineral powder
    03376341126015404896
    10033763401126154254896
    Notes: RCA—Recycled coarse aggregate; NCA—Natural coarse aggregate.
    下载: 导出CSV

    表  4  纤维增强高强再生骨料混凝土梁(FRHRACB)的设计参数

    Table  4.   Design parameters of fiber reinforced high-strength recycled aggregate concrete beams (FRHRACB)

    Specimenγ/%Fiber content/(kg·m−3)$ {f}_{\mathrm{c}\mathrm{u}} $/MPa$ {f}_{\mathrm{c}} $/MPaK/(kN·mm−1)Slump/mm
    PVASteel
    NACB00.00.069.049.917.4201
    RACB1000.00.066.441.115.7176
    0.1vol%PVA/RACB1001.30.062.140.116.9150
    0.3vol%PVA/RACB1003.90.057.439.417.4112
    0.5vol%S/RACB1000.039.066.242.318.3161
    1.5vol%S/RACB1000.0117.070.446.819.1132
    0.3vol%PVA-0.5vol%S/RACB1003.939.061.440.817.675
    0.1vol%PVA-1.5vol%S/RACB1001.3117.064.743.917.8110
    Notes: γ—Replacement ratio of RCA; $ {f}_{\mathrm{c}\mathrm{u}} $—Compressive strength of concrete; $ {f}_{\mathrm{c}} $—Axial compressive strength of concrete; K—Initial stiffness of specimens; NACB—Natural aggregate concrete beams; RACB—Recycled aggregate concrete beams; S—Steel fibers.
    下载: 导出CSV

    表  5  钢材性能

    Table  5.   Material properties of steel bars

    Steel bars typed/mm$ {f}_{\mathrm{y}} /$MPa$ {f}_{\mathrm{u}} / $MPa$ {E}_{\mathrm{c}} $/MPa
    HRB400224015302.1×105
    124435842.1×105
    HPB30063324562.2×105
    Notes: d—Diameter of rebar; $ {f}_{\mathrm{y}} $—Yield strength of rebar; $ {f}_{\mathrm{u}} $—Tensile strength of rebar; $ {E}_{\mathrm{c}} $—Elastic modulus of rebar.
    下载: 导出CSV

    表  6  各FRHRACB特征点荷载

    Table  6.   Characteristic load of FRHRACB

    Specimen$ {P}_{\mathrm{r}} $/kN$ {P}_{\mathrm{y}} $/kN$ {P}_{\mathrm{p}} $/kN
    NACB35177212
    RACB25196213
    0.1vol%PVA/RACB30200213
    0.3vol%PVA/RACB35199213
    0.5vol%S/RACB30201218
    1.5vol%S/RACB40200221
    0.3vol%PVA-0.5vol%S/RACB30199219
    0.1vol%PVA-1.5vol%S/RACB40202222
    Notes: $ {P}_{\mathrm{r}} $—Crack load; $ {P}_{\mathrm{y}} $—Yield load; $ {P}_{\mathrm{p}} $—Peak load.
    下载: 导出CSV

    表  7  各FRHRACB特征点挠度及延性系数

    Table  7.   Characteristic deflection and ductility coefficient of FRHRACB

    Specimen$ {\varDelta }_{\mathrm{y}} $/mm$ {\varDelta }_{\mathrm{p}} $/mmμ
    NACB11.1530.802.76
    RACB13.5534.912.58
    0.1vol%PVA/RACB12.6335.212.79
    0.3vol%PVA/RACB13.2340.123.03
    0.5vol%S/RACB13.2437.252.81
    1.5vol%S/RACB12.7936.072.82
    0.3vol%PVA-0.5vol%S/RACB13.2140.303.05
    0.1vol%PVA-1.5vol%S/RACB11.8936.803.10
    Notes: $ {\varDelta }_{\mathrm{y}} $—Yield displacement; $ {\varDelta }_{\mathrm{p}} $—Peak displacement; μ—Displacement ductility coefficient.
    下载: 导出CSV

    表  8  试验结果与计算结果比较

    Table  8.   Comparison of test results with calculation results

    SpecimenMt/(kN·m)Mc/(kN·m)Mt/Mc
    NACB81.2779.181.026
    RACB81.6579.071.033
    0.1vol%PVA/RACB81.6578.871.031
    0.3vol%PVA/RACB81.6578.611.039
    0.5vol%S/RACB83.5783.131.005
    1.5vol%S/RACB84.7291.930.922
    0.3vol%PVA-0.5vol%S/RACB83.9582.551.017
    0.1vol%PVA-1.5vol%S/RACB85.1091.040.935
    $ \mu ' $1.001
    $ D $0.0434
    $ {C_{\text{v}}} $0.0434
    Notes: Mt—Test results; Mc—Calculation results; µ'—Mean; $ D $—Variance; $ {C_{\text{v}}} $—Coefficient of variation.
    下载: 导出CSV
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  • 收稿日期:  2021-09-18
  • 修回日期:  2021-11-04
  • 录用日期:  2021-11-05
  • 网络出版日期:  2021-11-11
  • 刊出日期:  2022-11-01

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