PENGARUH MATERIAL DINDING SEMEN ECENG GONDOK TERHADAP PENYERAPAN SUARA (FUNGSI AKUSTIK)

Abstract

‘Eceng Gondok’ was still considered as troubled weeds plant, since the growth was so fast
and in 3-4 months able to cover more than 70% water surface.
The research was done in Civil Engineering Laboratory University of Muhammadiyah Malang
by prototype placement south area of University of Muhammadiyah Malang stadium. Compound
material with ‘Eceng Gondok’ compound material : glue : cement was 1:1:2.5. Test was done in 3
sound sources 80 dB, 85 dB, and 90 dB.
Test which was done to wall prototype was bounce back sound, escape sound, and sound
absorption to eceng gondok wall by comparing to brick wall prototype with similar test. From test
and calculation, there found average value for eceng gondok wall was not better in sound absorption
with brick wall > eceng gondok wall in sound source 80 dB, 85 dB, and 90 dB found 31.63 > 28.96
dB, 36.64 > 30.06 dB, 39.81> 29.95 dB. eceng gondok wall was better for escape sound with value
brick wall < eceng gondok wall in sound source 80 dB, 85 dB, and 90 dB found 39.86 < 42.46 dB,
39.68 < 46.34 dB, 41.46 < 51.63 dB. And eceng gondok wall could be similar in echo sound with
significance 5% at the sound source 80 dB, 85 dB, and 90 dB.

Keywords: cement wall, ‘Eceng Gondok’, sound absorption (acoustic)