Sains Malaysiana 50(2)(2021): 537-547

http://dx.doi.org/10.17576/jsm-2021-5002-24

Acoustic Properties of Lightweight Foamed Concrete with Eggshell Waste as Partial Cement Replacement Material

(Sifat Akustik Konkrit Berbusa Ringan dengan Sisa Kulit Telur sebagai Bahan Penggantian Simen Separa)

LIM SIONG KANG¹*, FOO KAR POH¹, LEE FOO WEI¹, TIONG HOCK YONG¹, LEE YEE LING¹, LIM JEE HOCK¹ & KING YEONG JIN²

¹Department of Civil Engineering, Universiti Tunku Abdul Rahman, Jalan Sungai Long, Bandar Sungai Long, Cheras 43000 Kajang, Selangor Darul Ehsan, Malaysia

²Department of Mechanical and Materials Engineering, Universiti Tunku Abdul Rahman, Jalan Sungai Long, Bandar Sungai Long, Cheras 43000 Kajang, Selangor Darul Ehsan, Malaysia

Diserahkan: 15 Jun 2020/Diterima: 27 Julai 2020

ABSTRACT

Nowadays, almost every industry needs to undergo green and sustainable industrial revolution due to pollutions like waste dumping and noise that deteriorating the environment. Therefore, feasibility study on application of eggshell waste as partial cement replacement in lightweight foamed concrete was conducted by aiming to solve environmental and acoustical issues, i.e. reduce eggshell waste and improve acoustic properties. In this study, compressive strength and acoustic properties of 1300 kg m^-3 lightweight foamed concrete with and without 5% eggshell powder as partial cement replacement material were tested. Optimal water to cement ratio of 0.6 was obtained for acoustic properties test by comparing compressive strength result. The result shows that application eggshell powder has generally reduced 7 days compressive strength but improved 28 days compressive strength, and either improve or maintain acoustics properties, in which lightweight foamed concrete that containing eggshell powder has improved noise reduction coefficient at testing ages of 7, 28, and 90 days and improved sound transmission class at testing age of 56 and 90 days. Based on these results, 5% of eggshell powder is feasible to be incorporated into lightweight foamed concrete as partial cement replacement material for sound insulation and strength development purposes.  

Keywords: Acoustic properties; eggshell waste; foamed concrete; performance index

ABSTRAK

Pada masa ini, hampir setiap industri perlu melalui revolusi industri hijau dan lestari kerana pencemaran seperti pembuangan sampah dan hingar yang merosakkan persekitaran. Oleh itu, kajian kebolehlaksanaan penggunaan sisa kulit telur sebagai penggantian simen separa dalam konkrit berbusa ringan telah dijalankan bertujuan untuk menyelesaikan masalah persekitaran dan akustik, iaitu mengurangkan sisa kulit telur dan meningkatkan sifat akustik. Dalam kajian ini, kekuatan mampatan dan sifat akustik 1300 kg m^-3 konkrit berbusa ringan dengan dan tanpa 5% serbuk kulit telur sebagai bahan pengganti simen separa diuji. Nisbah air dan simen optimum 0.6 diperoleh untuk ujian sifat akustik dengan membandingkan hasil kekuatan mampatan. Hasilnya menunjukkan bahawa penggunaan serbuk kulit telur secara amnya telah mengurangkan kekuatan mampatan 7 hari tetapi meningkatkan kekuatan mampatan selama 28 hari, sama ada memperbaiki atau mengekalkan sifat akustik dengan konkrit berbusa ringan yang mengandungi serbuk kulit telur telah meningkatkan pekali pengurangan hingar pada usia ujian 7, 28 dan 90 hari serta peningkatan kelas transmisi suara pada usia ujian 56 dan 90 hari. Berdasarkan hasilnya, 5% serbuk kulit telur layak untuk dimasukkan ke dalam konkrit berbusa ringan sebagai bahan pengganti semen separa untuk tujuan penebat dan pengembangan kekuatan.

Kata kunci: Indeks prestasi; konkrit berbuih; sifat akustik; sisa kulit telur

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*Pengarang untuk surat-menyurat; email: sklim@utar.edu.my