摘要
试验研究了3种纤维掺量聚乙烯醇纤维增强水泥基复合材料(PVA-ECC)的单轴拉伸力学性能及纤维掺量对ECC力学性能的影响规律,探讨了裂缝扩展宽度与轴拉应力的关系,分析了ECC拉伸断裂能与特征长度.结果表明:当纤维掺量由0.308%提高到0.462%时,PVA-ECC的断裂能提高128%,特征长度提高146%,最大拉应变提高128%.PVA-ECC的断裂能和最大拉应变比聚丙烯纤维混凝土分别提高209%和3 614%.表明PVA纤维具有良好的阻裂增韧效用,显著提高了ECC的抗裂性能和变形能力,ECC在单轴拉伸荷载下能实现应变硬化和多重裂纹开裂.
Uniaxial tensile test of three ratios polyvinyl alcohol fiber reinforced cementitious composites(PVA-ECC) and the influence regularity on the mechanical properties of ECC under different fiber content were studied in this paper.The relationship of crack width and tensile stress was researched.Tensile fracture energy and characteristic length were discussed.The result indicates that from 0.308% to 0.462% of PVA fiber in volume,fracture energy,characteristic length and maximum tensile strain for PVA-ECC impro...
出处
《北京工业大学学报》
EI
CAS
CSCD
北大核心
2009年第9期1204-1208,共5页
Journal of Beijing University of Technology
基金
北京市教委资助项目(KM200610005007)
关键词
单轴拉伸
PVA
断裂能
应变硬化
多重裂纹
混凝土
复合材料
uniaxial tensile
polyvinyl alcohol
fracture energy
strain-hardening
multiple cracking
concrete
composite
