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Effect of high temperatures on steel fiber reinforced concrete with EAF slag aggregates



Author(s): I. Papayianni, M. Papachristoforou
Paper category: Conference
Book title: 8th RILEM International Symposium on Fiber Reinforced Concrete: challenges and opportunities (BEFIB 2012)
Editor(s): Joaquim A.O. Barros
Print ISBN: 978-2-35158-132-2
e-ISBN: 978-2-35158-133-9
Publisher: RILEM Publications SARL
Pages: 624 - 634
Total Pages: 10
Language: English


Abstract: 
This paper discusses an experimental study on concrete mixtures that can be applied where protection against radiation and high temperatures is required. Limestone aggregates utilized in ordinary concrete were replaced by Electric Arc Furnace (EAF) slag of 3.30 gr/cm³ density and in addition, fibers (hooked-end steel fibers) were incorporated into the mixtures. The primary objective was to obtain the optimum rate of limestone aggregates replaced by EAF slag in steel fiber reinforced concrete (SFRC) mixtures with 30 mm long fibers. The density, compressive strength and flexural strength of all mixtures were measured as well as the flexural toughness. A second aim was to study the properties of the optimum SFRC mixture with EAF slag aggregates after exposure to high temperatures. Two types of steel fibers (30 mm and 60 mm long) were used as reinforcement. An adequate number of cube specimens were prepared and exposed to 400, 500, 600 and 800°C. Then, the residual density, compressive strength and ultrasonic pulse velocity were measured and compared with ordinary concrete. The results indicate that the optimum utilization of EAF slag in fibrous concrete mixtures is achieved when only coarse limestone aggregate particles are replaced by it. This way workability is not affected while unit weight and mechanical properties of concrete are sustained at higher levels compared to ordinary concrete with limestone aggregates. The SFRCs with EAF slag aggregates present higher residual compressive strength after exposure to high temperatures compared to unreinforced concretes. The 60 mm long steel fibers render in higher flexural toughness and residual strength concretes than those with 30 mm fibers.


Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00