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Fibers 2019, 7(2), 9; https://doi.org/10.3390/fib7020009

Mechanical Properties of Concrete with Steel and Polypropylene Fibres at Elevated Temperatures

1
Materials Testing Institute, University of Stuttgart, Pfaffenwaldring 4C, 70569 Stuttgart, Germany
2
Institute of Construction Materials, University of Stuttgart, Pfaffenwaldring 4G, 70569 Stuttgart, Germany
3
University of Stuttgart, 70569 Stuttgart, Germany
*
Author to whom correspondence should be addressed.
Received: 6 December 2018 / Revised: 10 January 2019 / Accepted: 16 January 2019 / Published: 24 January 2019
(This article belongs to the Special Issue Recent Advancements in Fiber Reinforced Concrete And its Applications)
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Abstract

Addition of steel fibres to concrete is known to have a significant positive influence on the mechanical properties of concrete. Micro polypropylene (PP) fibres are added to concrete to improve its performance under thermal loads such as in case of fire by preventing the phenomena of explosive spalling. An optimum mixture of steel and micro PP fibres added to concrete may be utilized to enhance both the mechanical and thermal behaviour of concrete. In this work, systematic investigations were carried out to study the influence of elevated temperature on the mechanical properties and physical properties of high strength concrete without and with fibres. Three different mixtures for high strength concrete were used, namely normal concrete without fibres, Steel fibre reinforced concrete and Hybrid fibre reinforced concrete having a blend of hooked end steel fibres and micro PP fibres. The specimens were tested in ambient conditions as well as after exposure to a pre-defined elevated temperature and cooling down to room temperature. For all investigated concrete mixtures the thermal degradation of following properties were investigated: compressive strength, tensile splitting strength, bending strength, fracture energy and static modulus of elasticity. This paper summarizes the findings of the tests performed. View Full-Text
Keywords: steel fiber reinforced concrete; polypropylene fibres; elevated temperature; hybrid fibre reinforced concrete; strength; fracture energy steel fiber reinforced concrete; polypropylene fibres; elevated temperature; hybrid fibre reinforced concrete; strength; fracture energy
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Bošnjak, J.; Sharma, A.; Grauf, K. Mechanical Properties of Concrete with Steel and Polypropylene Fibres at Elevated Temperatures. Fibers 2019, 7, 9.

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