Journal of Structural and Construction Engineering

Journal of Structural and Construction Engineering

Investigation of the effect of elevated temperatures on the mechanical properties of concretes containing different fibers

Document Type : Original Article

Authors
Mohammad Saber Moradi 1
Mohammad Hadi Tavana 2
Mohammad Reza Habibi 3
Moslem Amiri 2
1 Ph.D. student, Department of Civil Engineering, Islamic Azad University, Kermanshah, Iran
2 Assistant Professor, Department of Civil Engineering, Faculty of Engineering, Islamic, Kermanshah Branch, Azad University, Kermanshah, Iran
3 Assistant Professor, Department of Civil Engineering, Islamic Azad University, Kermanshah, Iran
10.22065/jsce.2024.441324.3354
Abstract
This study investigates the impact of various fibers on the performance of concrete under high-temperature conditions, considering the prevalent factors leading to concrete degradation, such as loading, thermal fluctuations, and moisture changes. In seismic-prone regions like Iran, the post-earthquake scenario often involves fire hazards, making the study of fire-induced concrete deterioration particularly relevant. The research focuses on determining the optimal percentage of fibers to enhance concrete behavior under high temperatures. A comprehensive set of tests, including slump, 7-day and 28-day compressive strength, and tensile strength assessments, was conducted on both fresh and hardened concrete samples. The study systematically varied fiber percentages, types, sample ages, applied heat levels, and cement content in the mix design to evaluate their collective impact on fiber-reinforced concrete in high-temperature environments. Results revealed that the inclusion of fibers led to a decrease in the workability of the concrete mix. However, this was offset by a significant contribution to the preservation of both compressive and tensile strength. Notably, polypropylene fibers exhibited superior performance compared to steel fibers. In grades 350, 400, and 450, the compressive strength increased by 8%, 22%, and 8.5%, respectively, when using polypropylene fibers instead of steel fibers. Similarly, the improvement in tensile strength with polypropylene fibers surpassed that of steel fibers, with enhancements of 22%, 16%, and a substantial 110% for grades 350, 400, and 450. The findings underscore the effectiveness of incorporating fibers, particularly polypropylene, in mitigating the adverse effects of high temperatures on concrete, offering insights that can inform future construction practices, especially in seismic regions prone to fire hazards.
Keywords
Compressive strength
Tensile strength
Cement content
Steel fiber
PP fiber

Subjects

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  • Receive Date 12 February 2024
  • Revise Date 22 May 2024
  • Accept Date 29 June 2024