纤维素纤维增强高韧性水泥基复合材料的拉伸力学性能  

Tensile Mechanical Properties of Cellulose Fiber Reinforced High Ductility Cementitious Composites

作　　者：邓宗才[1] 薛会青[1] 李朋远[1] 张鹏飞[1] 

机构地区：[1]北京工业大学建筑工程学院,北京100124

出　　处：《北京工业大学学报》2009年第8期1069-1073,共5页Journal of Beijing University of Technology

基　　金：北京工业大学第六届研究生科技基金项目资助(ykj-2007-1819)

摘　　要：研究了3种纤维掺量UF纤维素纤维增强水泥基复合材料(UF-ECC)的单轴拉伸性能及纤维掺量对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的拉伸断裂能与特征长度.结果表明:当纤维体积掺量由0.3%提高到0.6%时,UF-ECC的最大拉应变提高183%,断裂能提高419%,特征长度提高281%.ECC复合材料的最大拉应变是聚丙烯纤维混凝土的8~20倍.UF纤维素纤维具有良好的阻裂增韧效用,显著提高了ECC的变形能力,ECC在单轴拉伸荷载下能实现应变硬化和多重裂纹初裂.Uniaxial tensile behavior is the important character for studying resistivity and toughening effect of engineering cementitious composites(ECC).Uniaxial tensile test of three ratios UF cellulose fiber reinforced cementitious composites(UF-ECC) and the influence regularity on the mechanical properties of ECC under different fiber content is studied in this paper.The relationship of crack width and tensile stress is researched.Tensile fracture energy and characteristic length are discussed.The result indicate...

关 键 词：单轴拉伸 断裂能 应变硬化 多重裂纹 混凝土 复合材料 纤维素纤维 

分 类 号：TU528.572[建筑科学—建筑技术科学]