Effect of Cooling Conditions, Retrofitting on Strength of Concrete Subjected to Elevated Temperature

Swapnil B. Kharmale; Pramod S. Sathe; Yashwant A. Kolekar

doi:10.28991/CEJ-2023-09-07-013

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Swapnil B. Kharmale
sbkharmale.civil@gcoeara.ac.in
Department of Civil Engineering, Government College of Engineering and Research, Savitribai Phule Pune University, Awasari 412405,, India https://orcid.org/0000-0002-4593-3686
Pramod S. Sathe Department of Civil Engineering, COEP Technological University, Pune 411005,, India
Yashwant A. Kolekar Department of Civil Engineering, COEP Technological University, Pune 411005,, India

Vol. 9 No. 7 (2023): July

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Concrete has a high degree of fire resistance at moderate temperatures. High temperatures, however, cause concrete to lose its stiffness and strength. The effects of cooling techniques and retrofitting on the strength of concrete exposed to high temperatures have not been synchronized in previous studies. This experimental research aims to evaluate the effect of cooling conditions and the effectiveness of retrofitting concrete subjected to elevated temperatures. Four types of concrete: M 20 normal concrete (NC); M 20 metakaolin concrete (MC); M 40 standard concrete (SC); and M 40 self-compacting concrete (SCC) are considered in this study. A total of 864 samples consisting of cube, beam, and cylinder specimens are subjected to sustained elevated temperatures of 400^oC, 600^oC, and 800^oC for 2 hours rating. The weight and strength of half of the heat-damaged samples are assessed following natural air cooling (NAC) and water jet cooling (WJC). The remaining 50% of samples retrofitted with carbon fiber reinforced polymer (CFRP) are tested to evaluate the upgraded strength. The experimental findings demonstrate that water jet cooling (WJC) causes more strength degradation, and CFRP proves to be effective in restoring the strength of heat-deteriorated specimens. Overall, self-compacting concrete (SCC) has shown high resistance to elevated temperatures.

Doi: 10.28991/CEJ-2023-09-07-013

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Kharmale, S. B., Sathe, P. S., & Kolekar, Y. A. (2023). Effect of Cooling Conditions, Retrofitting on Strength of Concrete Subjected to Elevated Temperature. Civil Engineering Journal, 9(7), 1737–1752. https://doi.org/10.28991/CEJ-2023-09-07-013

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Publication Start Year:	2015
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Effect of Cooling Conditions, Retrofitting on Strength of Concrete Subjected to Elevated Temperature

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