混掺精细钢纤维/PVA水泥基复合材料单轴抗压试验及本构模型研究

Uniaxial Compression Test and Constitutive Model of the Cement-Based Composite with Mixed Fine Steel Fiber and PVA

通过进行10组30个精细钢纤维-PVA纤维混杂水泥基棱柱体的单轴抗压试验,测得其应力-应变曲线和抗压强度,分析了单掺与混掺情况下纤维掺量对材料抗压性能的影响.试验结果表明:混掺精细钢纤维对提高材料抗压性能有利,包含0.4%精细钢纤维的混掺试件轴心抗压强度较单掺对比组提高了7.5%,峰值应变提高了58%.基于试验数据,建立了适用于精细钢纤维-PVA纤维混杂水泥基材料的轴心受压应力-应变本构模型,模型结果与试验曲线吻合良好.

In this work,the uniaxial compression experiments on 30 prisms of 10 groups are conducted to acquire the uniaxial compressive stress-strain relationship of the cement-based composite with the mixed fine steel fiber and PVA.The effect of fiber volume on the compressive performance of the material is investigated under the pure blending and the mixed blending situations.Experimental results suggest that mixing the fine steel fiber with PVA can effectively improve the compressive performance of the cement-based material.The uniaxial compressive strength and peak strain of the mixed sample with a fine steel fiber content of 0.4%is improved by 7.5%and 58%,respectively,compared to the comparative samples with fine steel fibers only.Based on the stressstrain data,the uniaxial compressive stress-strain constitutive model for the cement-based material mixed with fine steel fiber and PVA is established.The model results are in good agreement with the experimental curve.