Investigation of the mechanical properties of structural lightweight concrete and fiber reinforced concrete exposed to elevated temperatures

Articles in Press

Document Type : Original Article

Authors

1 Ph.D Candidate, Civil engineering department. Shahroud Branch, Islamic azad university, Shahroud, Iran

2 Assistant Professor, Civil engineering department. Shahroud Branch, Islamic azad university, Shahroud, Iran

3 PhD, Department of civil and environmental engineering (Concrete and Building Materials Laboratory), Amirkabir university of technology, Tehran. Iran.

10.22065/jsce.2024.421952.3248

Abstract

Concrete is one of the most widely used materials in the current century. At high temperatures, due to high thermal stresses and low tensile strength, this material suffers from problems such as cracking, crumbling, or disintegration. In this research, concrete samples have been reinforced using steel and polypropylene fibers and subjected to different temperatures from 25 degrees to 800 °C, and compressive and tensile strength tests have been performed on the samples. In order to better examine the results, a concrete sample containing lightweight aggregate was also prepared and tested along with other samples. The test results showed that with the addition of steel and polypropylene fibers, the compressive strength up to the temperature of 200 °C is higher or similar to the control sample. Also, the tensile strength test results showed that samples containing steel fibers had the highest tensile strength at all temperatures. The results of the compressive and tensile strength test also displayed that at temperatures of 600 °C and above, the lightweight concrete sample has a higher or similar strength to the control sample. Polypropylene fibers start to melt at 400 °C, which has caused a drop in compressive and tensile strength in samples containing this type of fibers at temperatures above 400 °C.

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Main Subjects

Journal of Structural and Construction Engineering

Articles in Press, Accepted Manuscript
Available Online from 08 January 2024

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History

  • Receive Date: 23 October 2023
  • Revise Date: 29 December 2023
  • Accept Date: 08 January 2024

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