Tensile Performance of Textile-Reinforced Concrete after Fire Exposure: Experimental Investigation and Analytical Approach
Publication: Journal of Composites for Construction
Volume 26, Issue 1
Abstract
This paper presents investigations on the tensile behavior of several textile-reinforced concrete (TRC) material compositions after fire exposure. First, experimental investigations are presented, aiming to provide insights into the thermomechanical performance of fire-exposed TRC, and data that can be used for the development and implementation of analytical or numerical models to design fire-exposed TRC elements. The applicability of the Aveston–Cooper–Kelly (ACK) theory is assessed for ambient and increased temperatures. TRC specimens with various cases of reinforcement (carbon or glass fibers, uncoated or coated textiles, low or high fiber volume fraction) were manufactured and subjected to temperatures reaching 700°C. The residual tensile capacity of the exposed specimens is discussed, focusing on the effect of the varying reinforcement. It is verified that the use of uncoated carbon fibers is the most promising solution for maintaining the residual capacity after fire exposure. Finally, it is concluded that the ACK predictions are reliable for TRC specimens with good bond conditions and when adopting a representative thermal degradation law for the reinforcement.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study (e.g., time versus temperature recordings from all fire tests, stress–strain results from all mechanical tests, and calculations of trilinear response based on ACK model) are available from the corresponding author upon reasonable request.
Acknowledgments
This research is co-financed by Greece and the European Union (European Social Fund—ESF) through the Operational Programme «Human Resources Development, Education and Lifelong Learning» in the context of the project “Strengthening Human Resources Research Potential via Doctorate Research” (Project No. MIS-5000432), implemented by the State Scholarships Foundation (ΙΚΥ). Additionally, the authors would like to thank the Flanders Research Foundation (FWO), the Agentschap voor Innovatie en Ondernemen (VLAIO), Grant Number IWT140070, as well as the Structural Materials Laboratory of the University of Patras for partly funding this research.
Notation
The following symbols are used in this paper:
- Af
- cross-sectional area of textile;
- cf
- correction factor for ACK predictions on tensile strength and postcracking modulus;
- err
- deviation between ACK predictions and experimental data;
- Ef
- elastic modulus of the textile;
- Em
- elastic modulus of the mortar;
- E1
- deformation modulus at end of Stage I of the composite;
- E2
- deformation modulus at end of Stage II of the composite;
- E3
- deformation modulus at end of Stage III of the composite;
- Km
- calibration parameter for degradation of carbon textiles (experimentally determined);
- T
- temperature;
- Vf
- fiber volume fraction of the composite;
- Vm
- mortar volume fraction of the composite;
- ɛm
- strain at compressive failure of the mortar;
- ɛ1
- cracking strain (strain at end of Stage I) of the composite;
- ɛ2
- strain at end of Stage II of the composite;
- ɛ3
- strain at failure of the composite;
- σf
- tensile strength of the textile;
- σm
- compressive strength of the mortar;
- σmf
- tensile strength from flexure of the mortar;
- σmt
- direct tensile strength of the mortar;
- σ1
- cracking stress (stress at end of Stage I) of the composite;
- σ2
- stress at end of Stage II of the composite; and
- σ3
- ultimate stress of the composite.
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Published In
Journal of Composites for Construction
Volume 26 • Issue 1 • February 2022
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Nov 11, 2020
Accepted: Aug 2, 2021
Published online: Dec 9, 2021
Published in print: Feb 1, 2022
Discussion open until: May 9, 2022
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