Experimental Investigation on Performance of High Strength Concrete in Prestressed Hollow Core Slabs Subjected to Elevated Temperature

Experimental Investigation on Performance of High Strength Concrete in Prestressed Hollow Core Slabs Subjected to Elevated Temperature
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© 2024 by IJETT Journal
Volume-72 Issue-6
Year of Publication : 2024
Author : Jeyashree T M, P R Kannan Rajkumar
DOI : 10.14445/22315381/IJETT-V72I6P127

How to Cite?

Jeyashree T M, P R Kannan Rajkumar, "Experimental Investigation on Performance of High Strength Concrete in Prestressed Hollow Core Slabs Subjected to Elevated Temperature," International Journal of Engineering Trends and Technology, vol. 72, no. 6, pp. 287-303, 2024. Crossref, https://doi.org/10.14445/22315381/IJETT-V72I6P127

Abstract
The purpose of the study is to examine the effect of elevated temperature on the performance of no-slump high-strength concrete containing fly ash, a routinely utilized material in prestressed precast elements. Assessing the response of structural elements under elevated temperatures is necessary to determine their ability to bear loads under such conditions. Insight into the concrete properties at elevated temperatures can help in assessing the damage attributed to temperature rise on structural elements due to accidental fires or explosions. Three concrete mixes of M50 grade are developed, satisfying the requirement for casting of precast elements by extrusion process. Optimum mix is arrived at room and elevated temperatures by examining the consistency of fresh concrete, and its mechanical and microstructural characteristics. The determined residual properties are compressive strength, split tensile strength, flexural strength, stress-strain behavior, modulus of elasticity, and Poisson’s ratio following exposure to a range of temperatures from 100°C to 600°C. Additionally, the established characteristics of the optimum mix are used in examining the post-fire response of prestressed hollow core slab using analytical investigation. The residual properties had a substantial decrease in its value upon reaching a temperature of 400°C and these properties had a major effect on the behaviour of slabs at higher temperatures exhibiting an increase in deflection with the decrease in ultimate load.

Keywords
Fly ash, High strength concrete, Elevated temperatures, Residual properties, Hollow core slab.

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