Investigation of the Effect of High-Temperature Glass Fibers and Pozzolanic Materials on Flexural Strength of Concrete by Pre-Mixing and Spraying Method

Document Type : Research Article

Authors

1 MSc. candidate, Department of Civil Engineering, University of Islamic Azad, South Tehran Branch, Iran

2 Civil Engineering Assistant Professor, Civil Engineering Faculty, Islamic Azad University, Arak branch, Iran

Abstract

This paper uses glass fibers and pozzolanic materials with different percentages. To investigate the flexural strength and toughness indices of concrete produced by pre-mixing and spraying methods, 15 mixing designs containing different percentages of glass fibers and pozzolanic materials in the pre-mixed method and 14 mixing designs with spraying method have been tested. All mixing schemes were also tested at 350, 650, and 1000 °C, and the results were analyzed by scanning electron microscope (SEM). The use of pozzolanic materials in specimens reinforced with glass fiber improves the modulus of rupture. The modulus of rupture in the presence of heat and the event of a fire is greatly reduced, which is a better performance for controlling this reduction process. Also, the flexural strength of high-temperature samples (1000 °C) can be significantly increased by using metakaolin at different percentages of 10 and 15%.

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References

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Amirkabir Journal of Civil Engineering
Volume 53, Issue 5
August 2021
Pages 2063-2090

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