Dynamic Fracture Behavior of Steel Fiber Reinforced Self-Compacting Concretes (SFRSCCs)

• Published in: Materials Vol. 10; no. 11; p. 1270
• Main Authors: Zhang, Xiaoxin, Ruiz, Gonzalo, Tarifa, Manuel, Cendón, David, Gálvez, Francisco, Alhazmi, Waleed H
• Format: Journal Article
• Language: English
• Published: Switzerland MDPI AG 05.11.2017; MDPI
• Subjects: drop-weight impact test; dynamic increase factor (DIF); fiber content; Fiber reinforced concretes; Flexural strength; flexure; Fracture toughness; Loading rate; Modulus of rupture in bending; Reinforcing steels; Self-compacting concrete; steel fiber reinforced self-compacting concrete (SFRSCC); Steel industry; Steels; fiber content; flexure; dynamic increase factor (DIF); steel fiber reinforced self-compacting concrete (SFRSCC); drop-weight impact test
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma10111270

Three-point bending tests on notched beams of three types of steel fiber-reinforced self-compacting concrete (SFRSCC) have been performed by using both a servo-hydraulic machine and a drop-weight impact instrument. The lo ading rates had a range of six orders of magnitude from 2.20 × 10 mm/s (quasi-static) to 2.66 × 10³ mm/s. These SFRSCCs had the same matrix, but various types of steel fiber (straight and hooked-end) and contents (volume ratios), 0.51%, 0.77% and 1.23%, respectively. The results demonstrate that the fracture energy and the flexural strength increase as the loading rate increases. Moreover, such tendency is relatively moderate at low rates. However, at high rates it is accentuated. For the 0.51% fiber content, the dynamic increase factors of the flexural strength and the fracture energy are approximately 6 and 3, while for the 1.23% fiber content, they are around 4 and 2, respectively. Thus, the higher the fiber content the less rate sensitivity there is.