Fundamental properties and mechanical characteristics of high performance cement composite with steel fibres under high temperature

Effect of SIFRCCs with Varying Steel Fiber Volume Fractions on Flexural Behavior

“…As shown in Figure 1, third-point loading was applied using a 200-ton universal testing machine. In addition, the deflection displacement at the center was taken using a Japanese yoke [1,9,[11][12], to which two linear variable differential transducers (LVDTs) were attached to the center of the specimen. The load was applied at the rate of 1 mm/min in the displacement control method.…”

“…Slurry was prepared after mixing the contents and poured until no more bubbles were seen, to ensure the infiltration of slurry into the fibers (as the void has negative effects on the strength of the concrete). In addition, to reduce material separation and achieve the required strength, amounts of fine aggregate and silica fume corresponding to 50% and 15% of the binder cement weights, respectively, were replaced before mixing [1,10,11]. Table 4 shows the mixing characteristics of the high-performance slurry used.…”

“…Furthermore, owing to the recent rapid development of construction technology, structures are becoming larger, higher, and longer, and the functions of structures are becoming more diversified and complicated, resulting in an increasing trend of unexpected loads such as explosions and fires [1][2][3]9,10]. These structures are usually located in high-traffic and densely populated areas, which can cause difficulties in recovering the structure if the structure is damaged due to an explosion or an extreme load such as a shock or impact, and there is a risk of chain damage [1,11,12]. Ultra-high-performance concrete (UHPC) is a high-tech material that follows new technological rules regarding composition, production, and mechanical behavior, as well as design and the construction of structures [13].…”

“…The typical defensive design used to respond to unexpected loads in existing structures has been to increase the thickness of concrete walls [11,12], but high-performance materials such as HPFRCCs provide other advantages that include improving the utilization of structures and the efficient reinforcement of work. However, while HPFRCCs have a high compressive strength, their tensile strength and strain capacity are slightly lower than their compressive strength performance.…”

“…However, while HPFRCCs have a high compressive strength, their tensile strength and strain capacity are slightly lower than their compressive strength performance. This may be the biggest issue for the limited fiber volume fraction of HPFCCs [1,11,12]. The increasing threat of global terrorism as well as general safety concerns has given rise to a need for reinforced concrete structures that can withstand sudden dynamic loads like impacts and blasts.…”