多尺度纤维对水泥基复合材料性能的影响  

Influence of performance of multi-scale fibers on cement-based composite materials

作　　者：卫颖颖 刘超群[1] 罗林 WEI Yingying;LIU Chaoqun;LUO Lin(School of Surveying and Testing,Shaanxi Railway Institute,Weinan 714099,Shaanxi Province,P.R.China;Sichuan Zili Survey Designing Co.Ltd.,Luzhou 646005,Sichuan Province,P.R.China)

机构地区：[1]陕西铁路工程职业技术学院测绘与检测学院,陕西渭南714099 [2]四川自力建筑勘测设计有限公司,四川泸州646005

出　　处：《深圳大学学报（理工版）》2024年第2期145-151,共7页Journal of Shenzhen University(Science and Engineering)

基　　金：国家自然科学基金资助项目(51709125);陕西省教育厅服务地方专项计划资助项目(23JM008)。

摘　　要：为准确掌握多尺度纤维对水泥基复合材料的性能影响规律,以碳酸钙晶须(calcium carbonate whisker,CW)纤维、钢纤维及聚乙烯醇(polyvinyl alcohol,PVA)纤维为基础,构建多尺度纤维水泥基复合材料,并在不同配合比条件下,通过流动性试验、单轴受压试验、三点弯曲缺口试验和叠加试验(overlay test,OT),研究多尺度纤维对水泥基复合材料力学性能、断裂性能及疲劳性能的影响规律.结果表明,多尺度纤维对水泥基复合材料的力学性能及断裂性能均具显著影响,在力学性能方面,多尺度纤维能较大程度上减弱水泥基复合材料的流动扩展度,并提高轴心抗压强度和弯曲抗拉强度;在断裂性能研究方面,单掺纤维组和混杂纤维组均能不同程度上提高水泥基复合材料的断裂性能.其中,对失稳断裂韧度和黏聚韧度的提升规律较为一致,在断裂性能指标的提升幅度上,黏聚韧度>失稳断裂韧度>起裂断裂韧度;CW纤维、钢纤维及PVA纤维的体积分数分别为0.50%、0.75%和0.25%时,水泥基复合材料的疲劳性能相对最优.研究成果可为水泥基复合材料的工程应用提供理论依据.To precisely understand the impact of multi-scale fiber on the performance of cement-based composite,a multi-scale fiber cement-based composite material was developed based on calcium carbonate whisker(CW)fiber,steel fiber,and polyvinyl alcohol(PVA)fiber.Under different multi-scale mixing ratios,various tests,including flowability test,uniaxial compression test,three point bending notch test and overlay test were conducted to study the influence of multi-scale fibers on the mechanical property,fracture performance,and fatigue performance of cement-based composite materials.The results show that multi-scale fibers have a significant impact on the mechanical and fracture properties of cement-based composites.In terms of mechanical properties,multi-scale fiber can significantly reduce the flow extension of cement-based composites and improve their axial compressive strength and flexural tensile strength.In terms of fracture behavior,both single fiber group and hybrid fiber group can improve the fracture performance of cement-based composite materials to varying degrees.Among them,the improvement law of unstable fracture toughness and cohesive toughness is relatively consistent.In terms of the improvement range of fracture performance indicators,cohesive toughness is greater than unstable fracture toughness,and the latter is greater than initiation fracture toughness.The cement-based composite materials with volume fractions of 0.50%,0.75%,and 0.25%for CW fiber,steel fiber,and PVA fiber demonstrate relatively optimal fatigue performance.The research results can provide theoretical foundation for the engineering application of cement-based composite materials.

关 键 词：复合材料 多尺度纤维 试验设计 力学性能 断裂性能 疲劳性能 

分 类 号：TU528.572[建筑科学—建筑技术科学]