Loading rate effect on crack velocity in ultra-high-performance fiber-reinforced concrete

作     者：Tri Thuong Ngo Park, Jun Kil Kim, Dong Joo 

作者机构：Sejong Univ Dept Civil & Environm Engn 98 Gunja Dong Seoul 05006 South Korea Thuyloi Univ Dept Civil Engn 175 Tay Son Dong Da Ha Noi Vietnam 

出 版 物：《CONSTRUCTION AND BUILDING MATERIALS》 (建筑与建筑材料)

年 卷 期：2019年第197卷

页      面：548-558页

核心收录：

学科分类：08[工学] 081304[工学-建筑技术科学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0813[工学-建筑学] 0814[工学-土木工程] 

基　　金：Construction Technology Research Project - Ministry of Land  Infrastructure and Transport [18SCIP-B128706-02] 

主　　题：UHPFRCs Crack velocity Digital image correlation Edge detection algorithms Strain-rate sensitivity High strain rates Three-point bending test 

摘      要：Loading rate effect on crack propagation in ultra-high-performance fiber-reinforced concrete (UHPFRCs) was investigated using a pre-notched three-point bending specimen in an improved-strain energy frame impact machine (I-SEFIM) and image processing techniques. The crack velocity of up to 984 m/s and the crack initiation strain rate of up to 271 s(-1) were observed. Crack velocity in UHPFRCs increased as the applied strain rate increased. Fiber reinforcements significantly affected on the crack velocity in the UHPFRC at static rates, but slightly did at high strain rates. There is a strong correlation between the strain-rate sensitivity and the dynamic crack growth characteristics of UHPFRCs. (C) 2018 Elsevier Ltd. All rights reserved.