骨料类型及纤维对高延性水泥基复合材料性能的影响

发布时间：2018-04-18 03:02

本文选题：骨料 + 纤维　；参考：《东南大学学报(自然科学版)》2017年06期

【摘要】：为了研究骨料类型及纤维对高延性水泥基复合材料(HDCC)性能的影响,分别采用普通河砂和金刚砂作骨料,添加聚乙烯醇(PVA)纤维,或PVA与微细镀铜钢混杂纤维,制备了4组HDCC,试验研究了HDCC的抗折与抗压强度、弯曲韧性、单轴拉伸性能、抗冲磨性能,并采用扫描电镜观察了HDCC拉伸破坏后PVA纤维的微观形貌.结果表明:骨料对HDCC抗折强度影响较为明显,而对抗压强度、弯曲韧性和抗冲磨性能影响不显著;微细钢纤维对HDCC抗折、抗压强度、弯曲韧性和抗冲磨性能的增强效果比较明显;在不同的HDCC体系中,微细钢纤维对延性影响的规律略有差异,以天然河砂为骨料时,掺加微细钢纤维会降低HDCC的延性,以金刚砂为骨料时,掺加微细钢纤维则会提高HDCC的延性;金刚砂提高了HDCC的抗拉强度,但显著降低了延性.
[Abstract]:In order to study the effect of aggregate type and fiber on the properties of high ductile cement-based composites (HDCCs), ordinary river sand and Emery were used as aggregates, polyvinyl alcohol PVA (PVA) fibers, or PVA and fine copper-plated steel hybrid fibers were added, respectively.Four groups of HDCCs were prepared. The flexural and compressive strength, flexural toughness, uniaxial tensile properties and impact wear resistance of HDCC were investigated. The morphology of PVA fiber after tensile failure of HDCC was observed by scanning electron microscope (SEM).The results show that the impact of aggregate on the flexural strength of HDCC is obvious, but not on the compressive strength, flexural toughness and impact and wear resistance of HDCC.In different HDCC systems, the effect of micro-steel fiber on ductility is slightly different. When natural river sand is used as aggregate, the ductility of HDCC can be reduced by adding micro-steel fiber.When carborundum is used as aggregate, the ductility of HDCC can be improved by adding fine steel fiber, and the tensile strength of HDCC is increased by adding carborundum, but the ductility is decreased significantly.
【作者单位】：东南大学材料科学与工程学院;东南大学江苏省土木工程材料重点实验室;南京水利科学研究院水文水资源与水利工程科学国家重点实验室;
【基金】：国家重点研发计划资助项目(2016YFC0401610) 国家自然科学基金资助项目(51378113,51438003) 江苏省自然科学基金资助项目(BK20151072) 江苏省六大人才高峰B类资助项目(JZ-004)
【分类号】：TU528

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