The hyacinth plant (Eichhornia crassipes) is an aquatic weed that causes the silting of swamps. The water hyacinth research was developed because of concerns over the threat of biodiversity in swamps by utilizing water hyacinth for ceramic and composite mixtures. This current research highlights the comparative acoustical performances of ceramic and composite with water hyacinth contents. Dried water hyacinth was added to the clay ceramic mixture with a weight percentage of 2, 6, 8, and 10 wt%. The ceramic dough was then shaped hexagonally with an interlock system and molded overlay respectively before burning and biscuits, while the composite dough consisted of 200 ml polyester resin: 25 mg water hyacinth: 20 ml catalyst. The acoustic test methods refer to ASTM 1050-98 and ASTM E2611-09 for sound absorption and sound transmission loss respectively. The result showed that the 8 wt% water hyacinth mixture of porous ceramic had an average absorption coefficient of 0.29 and a sound transmission loss of a wide range of frequencies with an average of 59.1 dB. Meanwhile, the resin composite has a poor average of sound absorption of 0.10 -0.11 and 58.08 -58.36 dB on its STL. The innovation of the water hyacinth-ceramic, however, had a promising character as a Helmholtz-based diffuser-absorber.
The research was aiming to investigate the potency of water hyacinth (WH) biochar as the most advantageous sound absorber composite when it was blended with polyvinyl alcohol (PVA). It was the first time using WH biochar-based composite as a sound absorber material. Analysis and characterization of the produced WH biochar were essentially performed using N2 absorption–desorption, FTIR spectrophotometer, and SEM methods. While the capability of the sound absorber material was technically conducted using a polyvinyl chloride (PVC) impedance tube of about 95 cm in length with internal and outer diameters of about 9.5 cm and 9.8 cm respectively. The materials that would be tested for their capability of sound absorber were prepared in a disk-like form with about 9.5 cm in diameter and 0.5 cm in thickness. The sound source was continuously turned on for 2 min and transmitted wirelessly through the impedance tube, and the decreasing intensity of the sound was recorded every 5 s. The results showed that the sound absorption coefficient (SAC) of the WH biochar-PVA composite was about 6.50% (0.0650) up to 21.03% (0.2103), while the SAC of the Styrofoam was just about 4.37% (0.0437). This research concluded that the WH biochar produced by the thermal energy of 500 °C indicated it could be the best sound absorber composite when it was blended with PVA, especially for a low frequency of about 440 Hz.
The research was aiming to investigate the potency of water hyacinth (WH) biochar as the most advantageous sound absorber composite when it was blended with polyvinyl alcohol (PVA). Analysis and characterization of the produced WH biochar were essentially performed using N2 absorption-desorption, FTIR spectrophotometer, and SEM methods. While the capability of the sound absorber material was technically conducted using a polyvinylchloride (PVC) impedance tube of about 95 cm in length with internal and outer diameters of about 9.5 cm and 9.8 cm respectively. The materials that would be tested for their capability of sound absorber were prepared in a disk-like form with about 9.5 cm in diameter and 0.5 cm in thickness. The sound source was continuously turned on for 2 minutes and transmitted wirelessly through the impedance tube, and the decreasing intensity of the sound was recorded every 5 seconds. The results showed that the sound absorption coefficient (SAC) of the WH biochar-PVA composite was about 6.50% (0.0650) up to 21.03% (0.2103), while the SAC of the Styrofoam was just about 4.37% (0.0437). This research concluded that the WH biochar produced by the thermal energy of 500oC indicated it could be the best sound absorber composite when it was blended with PVA, especially for a low frequency of about 440 Hz.
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