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Polymers 2016, 8(12), 446; doi:10.3390/polym8120446

Transient Thermal Tensile Behaviour of Novel Pitch-Based Ultra-High Modulus CFRP Tendons

1
Mechanical Systems Engineering Laboratory, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
2
BRE Centre for Fire Safety Engineering, Institute for Infrastructure & Environment, School of Engineering, University of Edinburgh, The King’s Buildings Edinburgh, EH93JL Scotland, UK
3
Concrete and Construction Chemistry Laboratory, Empa, Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
4
Institute for Building Materials (IfB), ETH Zurich, 8092 Zurich, Switzerland
*
Author to whom correspondence should be addressed.
Academic Editors: Alper Ilki and Masoud Motavalli
Received: 24 October 2016 / Revised: 5 December 2016 / Accepted: 6 December 2016 / Published: 21 December 2016
View Full-Text   |   Download PDF [3287 KB, uploaded 21 December 2016]   |  

Abstract

A novel ultra-high modulus carbon fibre reinforced polymer (CFRP) prestressing tendon made from coal tar pitch-based carbon fibres was characterized in terms of high temperature tensile strength (up to 570 °C) with a series of transient thermal and steady state temperature tensile tests. Digital image correlation was used to capture the high temperature strain development during thermal and mechanical loading. Complementary thermogravimetric (TGA) and dynamic mechanical thermal (DMTA) experiments were performed on the tendons to elucidate their high temperature thermal and mechanical behaviour. The novel CFRP tendons investigated in the present study showed an ambient temperature design tensile strength of 1400 MPa. Their failure temperature at a sustained prestress level of 50% of the design tensile strength was 409 °C, which is higher than the failure temperature of most fibre reinforced polymer rebars used in civil engineering applications at similar utilisation levels. This high-temperature tensile strength shows that there is potential to use the novel high modulus CFRP tendons in CFRP pretensioned concrete elements for building applications that fulfill the fire resistance criteria typically applied within the construction industry. View Full-Text
Keywords: carbon fibre reinforced polymers (CFRPs); high elastic modulus; tensile properties; high temperature behaviour; dynamic mechanical thermal analysis (DMTA); thermogravimetric analysis (TGA) carbon fibre reinforced polymers (CFRPs); high elastic modulus; tensile properties; high temperature behaviour; dynamic mechanical thermal analysis (DMTA); thermogravimetric analysis (TGA)
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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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Terrasi, G.P.; McIntyre, E.R.E.; Bisby, L.A.; Lämmlein, T.D.; Lura, P. Transient Thermal Tensile Behaviour of Novel Pitch-Based Ultra-High Modulus CFRP Tendons. Polymers 2016, 8, 446.

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