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Spherical shaped EAF slag fine aggregate is a promising alternative of natural sand in concrete as it imparts improved mechanical, durability and thermal properties. These features indicate the possibility of obtaining concrete of improved fire resistance by using spherical shaped EAF slag fine aggregate which have not yet been studied. The basic intent of this study is to investigate the high temperature response of concrete produced by spherical shaped EAF oxidizing slag fine aggregates. In this study, seven different types of concrete were produced by replacing natural sand with spherical and angular shaped EAF slag fine aggregates at a volume ratio of 0.0, 0.3, 0.5 and 1.0 for the water to cement ratio (W/C), slump and air content of 0.4, 5 cm and 5% respectively. The specimens were heated in the electric furnace at four different temperature state ranging from 200 °C to 1000 °C after a curing age of 28 days. All the specimens (both heated and sound) were tested for physical properties such as mass loss, length change and mechanical properties such as compressive strength, elastic modulus, flexural strength and tensile fracture energy. Results indicate that spherical shaped EAF slag concrete being exposed to high temperature undergoes lower mass loss with the increase in slag replacement ratio and the values are lower than angular shaped EAF slag concrete of same slag ratio. In addition, up to a heating temperature of 500 °C, spherical shaped EAF slag concrete exhibits superior residual elastic modulus and similar to slightly decreasing residual compressive and flexural strength in comparison to normal concrete. |
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