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钢纤维砂浆抗裂性能的定量评价与机理

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Abstract:

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。

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