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- W2078674001 abstract "Abstract Several studies have already reported on the various effects of high temperature on the mechanical properties of fiber reinforced concrete (FRC). Some of these effects include changes in; compressive strength, compression toughness and splitting tensile strength. None of the previous studies have investigated the changes that might occur on the post-crack flexural response and flexural toughness. Post-crack (or peak) response and toughness is considered one of FRC’s key beneficial characteristics – as the purpose of adding fibers is to increase the energy absorption and load carrying capacity after an initial crack. In this study, the flexural toughness test according to ASTM C1018 was carried out on two types of concrete: plain concrete and fiber reinforced concrete with three different types of fiber (steel, polypropylene, and polyethylene) at 0.5% and 1.0% by volume fractions. Prior to the flexural test, the specimens were put in an oven chamber and subjected to high temperatures using the ISO/TR834 standards of: 400 °C, 600 °C and 800 °C. The results showed the typical load–deflection response of FRC was a double-peak response. The first peak represented the properties of concrete matrix and the second peak represented the properties of the fibers used. Under flexural load, instead of dropping (or remaining unchanged), the post-peak load and the toughness were found to increase at lower temperatures (400 °C) and later, decreased as the temperature increased (600 °C and 800 °C). Fiber type and content also played an important role. At a temperature of 400 °C, all FRCs exhibited higher flexural strength and increased post-peak response and toughness. A significant decrease in strength, toughness and load–deflection response was observed with synthetic or plastic FRC (PFRC) when the temperature approached 800 °C. When steel FRC (SFRC) was used, those effects were relatively small. It appears, SFRC has better heat resistance than the PFRC. The density (measured by ultrasonic pulse velocity) was found to decrease more in the PFRC than in the SFRC." @default.
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- W2078674001 date "2010-10-01" @default.
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- W2078674001 title "Post-crack (or post-peak) flexural response and toughness of fiber reinforced concrete after exposure to high temperature" @default.
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- W2078674001 doi "https://doi.org/10.1016/j.conbuildmat.2010.04.003" @default.
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