基于水泥基材料多尺度的结构特征及破坏过程,设计了一种由钢纤维、聚乙烯醇(PVA)纤维以及碳酸钙晶须构成的多尺度纤维增强水泥基复合材料(MSFRCC),研究了其抗压强度、抗弯强度、弯曲韧性、多缝开裂形态以及断裂过程等基本力学性能.结果表明:基体材料的强度和韧性均得到了显著提高;MSFRCC在弯曲荷载作用下表现出了硬化行为和多缝开裂模式.扫描电子显微镜和断裂试验结果证实了多尺度纤维在水泥基复合材料破坏过程中发挥了多尺度阻裂作用.研究认为:通过对纤维进行多尺度组合设计,可以显著改善水泥基复合材料的韧性,廉价的碳酸钙晶须可以适量取代钢纤维和PVA纤维.
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