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基于水泥基复合材料多尺度的结构特征,设计了一种由聚乙烯醇(PVA)纤维以及碳酸钙晶须增强的新型多尺度超高韧性水泥基复合材料(Mutil Scale-Ultra High Toughness Cementitious Composite,简称MSUHTCC),并研究了16组MS-UHTCC配比的抗压强度和单轴拉伸性能,探讨了晶须和PVA纤维对水泥基的增强机理。结果表明:晶须的掺入可提高UHTCC的抗压强度、延性及抗拉强度,MS-UHTCC在单拉作用下表现出明显的应变硬化行为和多缝开裂模式,利用碳酸钙晶须和国产PVA配制廉价MS-UHTCC具有可行性。
Based on the multi-scale structural features of cement-based composites, a novel Mutil Scale-Ultra High Toughness Cementitious Composite (PSF) composite reinforced by polyvinyl alcohol (PVA) fibers and calcium carbonate whiskers was designed. Referred to as MSUHTCC). The compressive strength and uniaxial tensile properties of 16 MS-UHTCC compounds were studied. The reinforcement mechanism of whiskers and PVA fibers to cement-based materials was also discussed. The results show that the incorporation of whiskers can improve the compressive strength, ductility and tensile strength of UHTCC. MS-UHTCC shows obvious strain hardening behavior and multi-crack mode under the single pull. The use of calcium carbonate whiskers and domestic PVA prepared cheap MS-UHTCC feasible.