钢纤维增强粉煤灰自密实混凝土力学性能研究
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中原工学院 建筑工程学院 河南 郑州

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河南省教育厅重点科研计划项目(18A5600004,20A560026)


Study on Mechanical Properties of Steel Fiber Reinforced Fly Ash Self-compacting Concrete
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Architectural engineering department,Zhongyuan University of technology

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Key scientific research project of education department of henan province

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    摘要:

    本文采用粉煤灰取代40%水泥制备粉煤灰SCC,研究其工作性、基本力学性能和轴压变形性能随钢纤维体积分数的变化规律,并进一步探索钢纤维掺入对其轴压应力-应变曲线各参数极限应力σ_0,峰值位移ε_0,应变能V_ε和相对韧性Γ的影响。结果表明:粉煤灰SCC的工作性随钢纤维体积分数的增加而降低,当钢纤维体积分数大于0.75%时,工作性降低幅度最明显;钢纤维体积分数的改变,对粉煤灰SCC抗压强度的影响不明显,但能够显著改善其劈裂抗拉强度和抗折强度,当钢纤维体积分数为1.00%时,劈裂抗拉强度和抗折强度较未掺钢纤维粉煤灰SCC分别提高了14%和12%。;钢纤维的加入能够显著改善粉煤灰SCC的轴压变形能力,当钢纤维体积分数0.50%时,σ_0,ε_0,V_ε和Γ与未掺钢纤维粉煤灰SCC相比分别提高了3%,35%,53%和49%。

    Abstract:

    In this paper, fly ash SCC is prepared by replacing 40% cement with fly ash. The effect of its workability, basic mechanical properties and axial compression deformation properties with the volume fraction of steel fibers is studied. The parameters of axial compression stress-strain curve, such as ultimate stressσ_0, peak displacementε_0, strain energyV_ε and relative toughnessΓ, are further explored. The results showed that the workability of fly ash SCC decreases with the increase of the volume fraction of steel fibers. When the volume fraction of steel fibers is more than 0.75%, the workability decreases most obviously. The change of the volume fraction of steel fibers has no obvious effect on the compressive strength of fly ash SCC, but it can significantly improve its splitting tensile strength and flexural strength. When the volume fraction of steel fibers is 1.00%, the splitting tensile strength and flexural strength are increased by 14% and 12% respectively compared with SCC without steel fiber fly ash. The addition of steel fibers can significantly improve the axial compressive deformation properties of fly ash SCC. When the volume fraction of steel fiber is 0.50%, σ_0, ε_0, V_ε and Γ are increased by 3%, 35%, 53% and 49% respectively compared with SCC without steel fiber fly ash.

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  • 收稿日期:2019-09-20
  • 最后修改日期:2019-10-14
  • 录用日期:2019-10-22
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