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基于图像分析技术,定量评价了钢纤维掺量、直径及形状对砂浆塑性开裂性能的影响规律。测试了相应条件下砂浆开裂时的塑性抗拉强度及随时间变化的水分蒸发速率,探讨了钢纤维的阻裂机理。结果表明:钢纤维掺量增加、直径减小,裂缝潜在参数Pcrack和尺度参数β降低,裂缝平均宽度降低,抗塑性开裂性能变好;波浪型钢纤维的抗塑性开裂性能优于平直型钢纤维;钢纤维对砂浆抗裂性能的改善主要归功于抗拉强度的提高,而与水分蒸发速率基本无关。
Based on the image analysis technology, the influence rules of steel fiber content, diameter and shape on the plastic cracking behavior of mortar were quantitatively evaluated. The plastic tensile strength of mortar under cracking and the evaporation rate of water over time were tested, and the mechanism of steel fiber cracking was discussed. The results show that the content of steel fiber increases, the diameter decreases, the potential parameter Pcrack and scale parameter β decrease, the average width of crack decreases, and the plastic cracking resistance becomes better. The plastic cracking resistance of wavy steel fiber is better than that of straight steel fiber. The improvement of crack resistance of steel fiber reinforced mortar is mainly attributed to the increase of tensile strength, but has little to do with the evaporation rate of water.