Abstract
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 × 10−3 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.
Highlights
Since self-compacting concrete (SCC) was developed in 1988 [1], it has been widely used in the construction industry due to the fact that the placement and quality control of SCC are much easier than those of conventional vibrated concrete (CVC) because of its characteristics of super fluidity and self-consolidation
There has been limited research on the impact behavior of steel fiber-reinforced self-compacting concrete (SFRSCC) [19,20,21,22] compared with the studies conducted on conventional vibrated steel fiber-reinforced concrete [23,24,25,26,27,28,29]
The results show that the fracture energy and the flexural strength increase as the loading rate increases for these three SFRSCCs
Summary
Since self-compacting concrete (SCC) was developed in 1988 [1], it has been widely used in the construction industry due to the fact that the placement and quality control of SCC are much easier than those of conventional vibrated concrete (CVC) because of its characteristics of super fluidity and self-consolidation. SCC has higher content in fine aggregates, which results in shorter characteristic length, less toughness and more brittleness than CVC with similar compressive strength [2,3,4]. This makes SCC structures vulnerable to impulsive loads, such as beam-column joints and coupling beams subject to earthquake loading, in which the strain rate could reach values up to. There has been limited research on the impact behavior of SFRSCC [19,20,21,22] compared with the studies conducted on conventional vibrated steel fiber-reinforced concrete [23,24,25,26,27,28,29]. In order to obtain better fluidity, coarse aggregate is removed from SFRSCC
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