Flatwise Compression and Flexural Behaviour of Perlite/Sodium Silicate Composite Foam

Abstract:

Flatwise compression and flexural behaviour of perlite/sodium silicate composites made of expanded perlite and sodium silicate is studied using a new manufacturing method for applications of sandwich foam core materials. Sodium silicate content in composites (a perlite particle size of 2-3mm) was varied for a range of 0.1 - 0.3 g/ml and compaction ratio for moulding for a range of 2.0 - 3.0. Specimens under flatwise compression were found to be more capable for energy absorption than those previously reported for lengthwise compression, ascribing to appearance of densification stage following the initial cracking. Also, under flexural loading, energy absorption in composites after the initial cracking was found to be in operation, supporting their candidacy for wide applications where gypsum boards are dominant. It was deduced from both flexural testing results and fracture mechanism that compressive strength is higher than tensile strength, suggesting the future directions of mechanical performance improvement.

• Periodical: Applied Mechanics and Materials (Volume 860)
• Pages: 19-24
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.860.19
• Online since: December 2016
• Authors: Md Arifuzzaman*, Ho Sung Kim
• Keywords: Composite, Energy Absorption, Expanded Perlite, Flexural Strength, Foam, Sodium Silicate

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