Thermal Resistance of Fibre-Reinforced and FRP-Wrapped RC Columns: An Experimental Investigation

Maulik Mistry; Prasad Barve; Piyush Patel

doi:10.54392/irjmt25316

Authors

Maulik Mistry Applied Mechanics Department, Government Engineering College, Godhra-389001, Gujarat, India Author https://orcid.org/0000-0002-5598-6108
Prasad Barve Applied Mechanics Department, Government Engineering College, Godhra-389001, Gujarat, India Author https://orcid.org/0000-0002-0894-6859
Piyush Patel Applied Mechanics Department, Government Engineering College, Godhra-389001, Gujarat, India Author https://orcid.org/0009-0007-0509-9491

DOI:

https://doi.org/10.54392/irjmt25316

Keywords:

High temperature, Steel fibres, Polypropylene fibres, Hybrid fibres, GFRP, CFRP

Abstract

Elevated temperatures significantly affect the construction industry, particularly for reinforced concrete (RC) columns. Although concrete resists high temperatures, exposure can cause spalling, cracking, and reduced load-bearing capacity. This study examines the effects of incorporating composite materials, such as steel, polypropylene, and hybrid fibres, into concrete and using fibre-reinforced polymer (FRP) wrapping to strengthen RC columns exposed to high temperatures. Thirty RC column specimens were cast, varying in dimensions, concrete type (control, steel fibres, polypropylene fibres, hybrid fibres reinforced), and FRP wrapping (Glass Fibre Reinforced Polymer (GFRP), Carbon Fibre Reinforced Polymer (CFRP)). The columns were subjected to 200 °C for 6 hours per day over 75 cycles and then tested for ultimate load-carrying capacity (failure load), displacement, secant stiffness, strain, failure modes, and crack patterns. The results showed that steel fibre-reinforced columns had higher failure loads than other fibre-reinforced columns. FRP-wrapped columns experienced a 7.35% to 23.36% decrease in failure load when exposed to high temperatures compared with unheated FRP-wrapped columns. Fibre-reinforced columns displayed lower displacement compared to control columns after exposure to 200 °C, whereas FRP-wrapped columns showed higher displacement. The findings recommended using various types of fibre-reinforced concrete and FRP wrapping to increase the load-carrying capacity and strengthen RC columns, particularly those exposed to high temperatures.

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