高韧性纤维增强水泥基复合材料的单轴拉伸力学性能  

Uniaxial Tensile Mechanical Properties of High Ductile Fiber Reinforced Cementitious Composites

作　　者：邓宗才[1] 薛会青[1] 李朋远[1] 张鹏飞[1] 佘向军[1] 

机构地区：[1]北京工业大学城市与工程安全减灾省部共建教育部重点实验室,北京100124

出　　处：《北京工业大学学报》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)

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...

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 

分 类 号：TU528.572[建筑科学—建筑技术科学]