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

doi:10.16552/j.cnki.issn1001-1625.2024.1388

摘要/Abstract

摘要： 为研究不同纤维对高延性水泥基材料(ECC)的增强机制,采用工程原状机制砂和三种纤维(聚乙烯醇(PVA)、聚丙烯(PP)和聚乙烯(PE))制备了ECC,研究对比了PVA纤维、PP纤维和PE纤维制备的ECC与基体的力学性能和微观结构,并通过数字图像处理技术表征了ECC弯曲裂缝分布形态变化规律。结果表明:掺入纤维使基体抗压强度降低,PE纤维降低幅度最小,采用PE纤维制备的ECC(E-PE)28 d抗压强度为52.5 MPa。在抗弯性能中,ECC的抗弯韧性和极限挠度相较于基体有所提升,E-PE的抗弯性能最优,其峰值荷载和极限挠度分别为5.51 kN和3.40 mm。随着抗弯挠度的增加,ECC的弯曲裂缝长度和裂缝面积均不同程度增加,E-PE在挠度为3.0 mm时裂缝面积仅为40.455 9 mm²。不同纤维的弯曲破坏机制不同,PVA和PP纤维为脱黏拔出破坏,试件表现为单裂纹韧性破坏;PE纤维则是拔出与断裂同时存在,试件表现为多点开裂的破坏模式。

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

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.

Key words: ECC, mechanical sand, fiber, digital image processing, crack, enhancement mechanism, failure mode

中图分类号:

TU528

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.

HAO Rusheng, HU Wei, HE Jingjing, WU Wenbo, LU Haodan, ZHANG Wei. Effects of Fiber Types on Mechanical Properties and Microstructure of Engineered Cementitious Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(7): 2396-2405.

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