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: 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;



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.


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.


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.


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.


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.