Experimental Study on Post-fire Behaviour of Concrete Containing Steel and Polypropylene Fiber and Recycled Metal Spring

Document Type : Research Paper

Authors

1 garmsar university

2 Semnan university

3 semnan university

Abstract

The use of fibre causes to improve resistance, ductility and durability of concrete. Concrete has fire-resistant properties, but the most concern is for rebars when the reinforced concrete structures are exposed to fire. For resolving this issue, fibre, as an alternative material, has been proposed to reduce mentioned risks. In this paper, an experimental study was conducted to assess the effect of different temperatures on the mechanical properties of concrete containing steel fibre, polypropylene and recycled steel springs with a hole diameters of 8, 12, 16 and 20 mm. The results showed that the use of metal springs led to an increase in the resistance of concrete up to 38%. Of all martials, added to the concrete, the most effective material for improving the compressive and tensile strength of concrete was the spring with a hole diameter of 12 mm and then steel fibre. Furthermore, the threshold temperature was 500 ° C which led to a severe reduction in the strength of samples.

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