In this study, the dynamic, compressive, and flexural behaviors of ultra-rapid-hardening mortar (URHM) containing 2% polyethylene fiber are investigated. The results confirm the robust strain-hardening behavior of URHM at an early age of 4 h. Its tensile strength, strain capacity, and g value at 4 h were found to be 7.3 MPa, 5.1%, and 297.5 kJ/m3, respectively. The compressive and flexural strength and toughness of URHM increased with the strain rate. A higher loading rate led to a greater increase in the strength; the rate sensitivity was higher during flexure compared to that during compression. The highest dynamic increase factor (DIF) of the compressive strength was 1.75 up to a strain rate of 115/s; the highest DIF of the flexural strength was 3.34 up to a strain rate of 96/s. Its deflection-hardening behavior was converted to deflection-softening behavior under impact loads having a potential energy of 392 J or greater. Furthermore, the greater potential energy led to a lower energy dissipation rate, and more energy remained in the system. The rate sensitivity of the URHM under compression was similar to that of other fiber-reinforced concretes; however, its flexural strength was less sensitive to the strain rate than that of the others.
|Journal||Archives of Civil and Mechanical Engineering|
|Publication status||Published - 2021 May|
Bibliographical noteFunding Information:
This research was supported by a Grant (21CTAP-C152069-03) from the Technology Advancement Research Program funded by the Ministry of Land, Infrastructure and Transport of the Korean government. The SHPB tests were conducted with the assistance of the Extreme Performance Testing Center at Seoul National University.
© 2021, Wroclaw University of Science and Technology.
All Science Journal Classification (ASJC) codes
- Civil and Structural Engineering
- Mechanical Engineering