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The composite panel test were made of gypsum, pumice powder, and glue with
composition of 1:2:1/2 and coconut fiber with volume fraction variation of 10%, 15%, 20%,
25%, and 30% by using Hand lay-up technique. The sound absorption panel was tested for
acoustic and mechanical characteristic using test standard with ASTM E1050, ASTM D256,
and ASTM D790, respectively. The result of data analysis was presented graphically and the
bounding of composite materials was analysed by using SEM photograph. From the data
analysis for 10mm thickness of composite with 30% fiber volume fraction gained the highest
sound absorption coefficient, the highest impact strength occurred on composite with 25%
fiber volume fraction. Meanwhile, the strength and modulus of bending occurred on
composite with 15% fiber volume fraction. Sound absorption coefficient for composite with
15mm thickness was higher than 10mm for 10% fiber volume fraction.
Keywords: pumice waste, coconut fiber, gypsum, acoustic and mechanic |
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