硅酸盐通报2025，Vol.44Issue(7)：2396-2405,10.DOI:10.16552/j.cnki.issn1001-1625.2024.1388
纤维类型对高延性水泥基材料力学性能与微观结构的影响
Effects of Fiber Types on Mechanical Properties and Microstructure of Engineered Cementitious Composites
摘要
Abstract
To investigate the reinforcement mechanism of different fibers on engineered cementitious composites(ECC),the in-situ manufactured sand from a certain project site and three types of fibers(polyvinyl alcohol(PVA),polypropylene(PP)and polyethylene(PE))were used to prepare ECC.The mechanical properties and microstructure of ECC prepared by PVA fibers,PP fibers and PE fibers were compared with the matrix.The distribution pattern of ECC bending cracks was characterized by digital image processing technology.The results show that the incorporation of fibers results in a reduction in the compressive strength of the matrix.Among them,the reduction in compressive strength is smallest for polyethylene PE fibers.The 28 d compressive strength of ECC prepared by PE fibers(E-PE)is 52.5 MPa.In terms of flexural performance,the flexural toughness and ultimate deflection of ECC are enhanced compared to the matrix.E-PE exhibits the best flexural performance,its peak load and ultimate deflection are 5.51 kN and 3.40 mm.With the increase of flexural deflection,the bending crack length and crack area of ECC increase.The crack area of E-PE is only 40.455 9 mm2 when the deflection is 3.0 mm.Distinct failure mechanisms are observed for different fibers.PVA and PP fibers exhibit pullout failure,while the specimens exhibit single crack toughness failure.PE fibers show a combination of pullout and breakage,its specimen shows multi point cracking failure mode.关键词
高延性水泥基材料/机制砂/纤维/数字图像处理/裂缝/增强机理/破坏模式Key words
ECC/mechanical sand/fiber/digital image processing/crack/enhancement mechanism/failure mode分类
建筑与水利引用本文复制引用
郝如升,胡炜,贺晶晶,吴文博,卢浩丹,张伟..纤维类型对高延性水泥基材料力学性能与微观结构的影响[J].硅酸盐通报,2025,44(7):2396-2405,10.基金项目
国家自然科学基金(5207090694) （5207090694）
