Acoustic and thermal performance of sandwich panels made with pine wood and loofah sponge

Authors

DOI:

https://doi.org/10.1590/1983-21252026v3913990rc

Keywords:

Adhesives. Renewable materials. Civil construction. Physical and mechanical properties.

Abstract

Growing interest in renewable products has driven research on the development of structural composites reinforced with plant-based fibers. Among their potential applications, thermal and acoustic insulation in civil construction stands out. This study aimed to evaluate the performance of sandwich panels manufactured with Pinus oocarpa veneers and luffa sponge. Three treatments were evaluated, consisting of five-layer panels that varied in the number of luffa sponge layers in the core (0, 1, and 2). The panels were assessed for physical properties (moisture content and density), mechanical properties (modulus of elasticity and modulus of rupture), as well as acoustic and thermal insulation performance. Analysis of variance was performed, and when statistically significant differences were detected, the Scott–Knott mean comparison test (5%) was applied. The results indicated that panels manufactured with two luffa layers exhibited lower sound absorption at frequencies between 200 and 1000 Hz, meeting acoustic comfort standards at 1000 Hz. Control panels, without a luffa core layer, showed higher mechanical strength. In addition, despite differences in thermal performance, all treatments met regulatory requirements and qualified as thermal insulators. Overall, sandwich panels manufactured with Pinus oocarpa veneers and a luffa core show promise for acoustic insulation and thermal comfort applications in civil construction, representing a natural and sustainable fibrous alternative.

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Published

13-03-2026

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Scientific Article