Tensile and Flexural Properties of Ultra High Toughness Cemontious Composite

作     者：李贺东 徐世烺 LI Hedong1,XU Shilang1,Christopher K Y Leung2 (1.State Key Laboratory of Coastal and Offshore Engineering ,Dalian University of Technology,Dalian 116024,China;2.Department of Civil Engineering,Hong Kong University of Science and Technology,Hong Kong,China SAR)

作者机构：State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology 

出 版 物：《Journal of Wuhan University of Technology(Materials Science)》 (武汉理工大学学报（材料科学英文版）)

年 卷 期：2009年第24卷第4期

页      面：677-683页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：Funded by the Hong Kong Research Grant Council( CERG UST6138/04E) the Key Program of National Natural Science Foundation of China( No.50438010) the Research & Application of Key Technology for the South-North Water Transfer Project Construction in China( JGZXJJ2006-13) 

主　　题：pseudo strain hardening cementitious composite multiple cracking ductility SEM 

摘      要：The tensile and flexural properties of polyvinyl alcohol （PVA） fiber reinforced ultra high toughness cementitious composite （UHTCC） were investigated. The composite, tested at the age of 14 d, 28 d and 56 d, shows extremely remarkable pseudo strain hardening behavior, saturated multiple cracking and ultra high ultimate strain capacity above 4% under uniaxial loading. Also, the corresponding crack widths are controlled under 50 um even at 56 days age. In the third point bending tests on thin plate specimens, the composite shows ultra high flexural ductility and multiple cracking on the tension surface. The high ultimate flexural strength/first tensile strength ratio of about 5 verifies the pseudo strain hardening behavior of UHTCC. SEM observation on fracture surfaces provides indirect evidence of optimal design for the composite.