Flexural Properties of Fly Ash Reinforced Perlite/Sodium Silicate Composite and Their Sandwich Structures
DOI:
https://doi.org/10.38032/scse.2025.3.157Keywords:
Sandwich Structure, Perlite, Formica Sheet, Fly ash, Sodium Silicate Solution, Flexural PropertiesAbstract
The current investigation is focused on improving the flexural properties of perlite/sodium silicate composites using fly ash as reinforcement. Perlite/sodium silicate composites are reinforced with varying amount of fly ash (15 %, 30 %, and 45 %). Formica sheet was used as skins of the sandwich structures with fly ash reinforced perlite/sodium silicate composite as core. To attach the formica sheet skins with core pure epoxy and fly ash reinforced epoxy was used. The flexural strength and modulus of perlite/sodium silicate composite, fly ash reinforced perlite/sodium silicate composite, and two types of sandwiches are determined by three point bending test according to the standard. Results showed that the flexural strength of fly ash reinforced perlite/sodium silicate composite for 30 % fly ash content was maximum and 147.62 % greater than perlite/sodium silicate composite without reinforcement. The flexural modulus increased with increasing fly ash content up to 40 % fly ash content. The maximum enhancement in flexural strength and modulus of fly ash reinforced core-based sandwiches were also found at a fly ash content of 30 %. Utilization of fly ash reinforced epoxy as adhesive layer in the interface between the core and the skin improved the flexural modulus of the sandwiches significantly but the flexural strength slightly decreased. The study suggests that fly ash is an excellent reinforcing agent for the improvement of the flexural properties of perlite/sodium silicate composites and their sandwich structures.
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Copyright (c) 2025 Bickrom Saha, Devashis Bagchi, Md. Roknuzzaman, Alamin Islam, Md. Shariful Islam, Md. Arifuzzaman (Author)
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