Pengaruh Ketebalan Beton Ringan Akustik Sabut Kelapa Terhadap Kedap Suara

Abstract

In this modern era ,the recontruction and development of technology is advancing Rapidly. This Causes the noise of a room also rises. This noise causes the effective use of space in building also decreases .Therefore we need a system for sound isolation or absortion by using soundproofing material, in the process of making lightweight concrete ,Mix material with low specific gravity are certainly needed. One alternative material that can be used is Coconut Fiber . Coconut Fiber can also by used as silencer .The quality of the sound dampening material is shown by the value A (Coefficient of absorption of the material sound). This research was conducted with the aim to determine the effect of thickness of lightweight concrete (cocofiber) on the strength of concrete to reduce sound. The study was conducted using a mixing of coconut fiber fibers with the percentages used were 0%, 10% and 20% and the sound frequency used was 500 Hz, 1000 Hz, 1500 Hz and 2000 Hz. The lowest sound absorbing results obtained in the mixture of 0% of sample III frequency 500 Hz with a value of 0.250. While the highest sound absorption coefficient results in the mixing of 20% of sample V frequency of 2000 Hz with a value of 0.956. with a biggest sound wave velocity 0f 1912 m/sec.