Acoustic Absorption Characteristics of Porous Asphalt Containing Coconut Shells
Norhafizah Manap1, Ramadhansyah Putra Jaya2, Muhammad Nazri Borhan3, Norhashidah Manap4, Juraidah Ahmad5
1Norhafizah Manap, Department of Civil and Structural Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi, Malaysia.
2Ramadhansyah Putra Jaya, Department of Civil Engineering Technology, Universiti Malaysia Pahang, Pahang, Malaysia.
3Muhammad Nazri Borhan, Department of Civil and Structural Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi, Malaysia.
4Norhashidah Manap, Department of Mechanical Engineering, Universiti Teknologi MARA, Terengganu Branch Bukit Besi Campus, Dungun, Malaysia.
5Juraidah Ahmad, Department of Civil Engineering, Universiti Teknologi Mara, Shah Alam, Selangor, Malaysia.
Manuscript received on 25 November 2019 | Revised Manuscript received on 06 December 2019 | Manuscript Published on 16 December 2019 | PP: 327-331 | Volume-8 Issue-3S3 November 2019 | Retrieval Number: C10011183S319/2019©BEIESP | DOI: 10.35940/ijrte.C1001.1183S319
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: In this study, coconut shells were used as aggregate replacement in porous asphalt to observe its effect on sound absorption through Impedance Tube test. For coconut shells aggregate porous asphalt to be used in realistic situations it is essential to ensure its mix integrity, resistance to oxidation and raveling as well as its durability; therefore, the Cantabro Test, Binder drain-down test and Theoretical Maximum Density were also conducted in this study. The result showed that porous asphalt containing coconut shells exhibited significance improvement of sound absorption. The sound absorption coefficient of porous asphalt incorporating 10%, 30% and 50% of coconut shells approximately at the peak of the curve which is at the frequency of 850hz are 0.93, 0.96 and 0.93 while for conventional porous asphalt is 0.89. This study also found that porous asphalt containing 10 – 50% of coconut shells contributed a significance improvement in sound absorption compare than conventional porous asphalt at the frequency of 200 – 1600 Hz. However, only porous asphalt containing 10% of coconut shells satisfied all the parameters tested similar to the conventional porous asphalt.
Keywords: Coconut Shells, Porous Asphalt, Sound Absorption.
Scope of the Article: Building and Environmental Acoustics