Resumen

QUINTERO, A. M. et al. Acoustic and thermal study of coconut fiber agglomerated with cassava starch. J. appl. res. technol [online]. 2025, vol.23, n.1, pp.33-44.  Epub 22-Ago-2025. ISSN 2448-6736.  https://doi.org/10.22201/icat.24486736e.2025.23.1.2669.

In this work, a thermal and acoustic study of specimens made from coconut fibers agglomerated with cassava starch was conducted. Measurement for acoustic characterization were performed in third-octave frequencies bands, between 100 and 5000 Hz (maximum frequency of absorption coefficient). Sound absorption coefficient (α) was measured in a transmission tube according to ISO 10534-2: 2001. Agglomerated coconut fiber with cassava starch material exhibits an acceptable sound absorption coefficient (greater than 0,65) across a wide frequency range (between 1000 and 5000 Hz). In addition, procedures described in ASTM E2611-19 were implemented to determine the sound transmission loss (STL), expressed in decibels (dB). Acceptable STL values for a natural fiber insulator were obtained. Improvements in STL were observed when increasing the thickness from 1,2 to 1,4 cm, at higher frequencies (17,3 dB at 5000 Hz). The results demonstrate the capacity of the tested specimen as a sound absorber, with absorption coefficient greater than 70% for a considerable range of frequencies, starting at 1000 Hz and above. Similarly, the thermal study based on ASTM C-177 indicates an average thermal conductivity coefficient of 0,174 W/m·K, in a range of inlet temperatures between 52°C and 137°C, confirming that it has good insulation properties, although still not comparable to some industrial materials.

Palabras llave : Biomaterial; coconut fiber; waste resources; acoustic conditioning; sound insulation; thermal insulation.

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