RESEARCH ARTICLE


Behavior of Structural Lightweight Polystyrene Foam Concrete Flat Slabs When Exposed to Fire



Magdy Youssef Riad1, Ata El-kareim Shoeib2, *
1 El Shrouk Academy, Al Shorouk, Cairo, Egypt
2 Mataria Faculty of Engineering, Helwan University, Helwan, Egypt


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Creative Commons License
© 2018 Riad and Shoeib.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Mataria Faculty of Engineering, Helwan University, Helwan, Egypt; Tel: 01004310530; E-mail:ataelkareim_2008@yahoo.com


Abstract

Background:

Reinforced concrete flat slab is used in a wide range of applications. In addition, reduction of the weight of the concrete used increases the advantages of the flat slab.

Objective:

The main objective of this work is to study the performance of structurally reinforced foam concrete flat slab exposed to fire under eccentric and concentric loads.

Methods:

The experimental specimens included eleven tested square slabs with typical dimensions of 150 mm thickness and 1750 mm total length. The column cross section was 200 × 200 mm at the center of the slab. The density of the used lightweight polystyrene foam concrete was 1820 kg/m3. The crack patterns, load-deflection curves, steel strains, deflection during the fire, reduction in deflection during cooling by air, and residual deflection after fire and cooling were investigated.

Results:

The experimental results showed that the cracking load and maximum load of the tested slab with foam concrete were reduced compared to those of normal concrete.

Conclusion:

From the analysis of the results, it was found that the fire caused a reduction in the ultimate loads in the case of tested foam concrete slabs compared to that of normal-weight concrete slab. And also, the deformation of the tested foam concrete slab during the fire was increased comparing with normal-weight concrete slab. In a theoretical study, the modification factor for calculating the maximum allowable punching force was evaluated according to the ACI-318 and BS-8110 codes, and the reduction factors of compressive strength during the fire was done.

Keywords: Lightweight concrete, Foam concrete, Flat slab, Fire condition, Reinforced concrete, Polystyrene.