The effect of pumice composition upon transmission loss and impact strength of pumice hybrid composite-coconut fiber/gypsum

• Published in: IOP conference series. Materials Science and Engineering Vol. 839; no. 1; pp. 12020 - 12028
• Main Authors: Suardana, N P G, Kencanawati, C I P K, Sugita, I K G, Wardana, I G N, Putra, I P G R
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.04.2020
• Subjects: Acoustic insulation; Charpy impact test; Composition effects; Fiber volume fraction; Gypsum; Hybrid composites; Impact strength; Pumice; Sound transmission; Test equipment; Transmission loss
• ISSN: 1757-8981; 1757-899X
• DOI: 10.1088/1757-899X/839/1/012020

Voice could not be separated from ears, but there is other sound called noise. Soundproofing panel in a room is highly important to hold and absorb sound in order to prevent sound to come and out of the room so the room will be comfortable. The objective of this study is to find the characteristic of transmission loss and the value of impact strength caused by the effect of pumice and gypsum composition. This study used 2 mm pumice combined with coconut fiber in 20% of fiber volume fraction, by using gypsum and glue matrix. The varied composition of this study used two comparisons Gypsum: Pumice: Glue of 1:1:1/2, and 1:2:1/2. Transmission loss was tested by using test equipment (ASTM-E-1050) and Sound Level Master (SL-4011), while the impact strength was tested by using Charpy Impact test equipment (ISO179-2). Result of this study showed that the lowest transmission loss occurred in specimen with composition 1:1:1/2 with value 13.48dB, while the highest transmission loss occurred in specimen with composition 1:2:1/2 with value 25.21dB. The lowest impact strength occurred in specimen with composition 1:2:1/2 with value 4.293kJ/m2, while the highest mean value for impact strength was 5, 534 kJ/m2 which occurred in composition 1:1:1/2.