The Effect of Perforation Properties on the Use of Fiber Reinforced Cementitious Panels as Grooved Acoustic Panels

Year 2023, Volume: 11 Issue: 2, 1075 - 1093, 30.04.2023

Lütfullah Gündüz , Şevket Onur Kalkan

https://doi.org/10.29130/dubited.1076395

Abstract

Perforated cement boards are used as a sound absorbing material, especially in indoor noise control. In this study, grooves with an average width of 4 mm and a depth of 6 mm were applied from one surface of the panels. Within the scope of the study, three different perforation rates were designed for acoustic performance analysis, and perforated test specimens were prepared by drilling holes with an average depth of 10 mm on the other surface of the plate samples to obtain rates of 5.5%, 8.0% and 12.6%, respectively. The sound absorption properties of the plates converted into this form have been examined. For perforated test specimens, 3 different groups were prepared depending on the applicability section. These; one-component perforated cement-bonded acoustic sheet in plain form (Yalın-I plate), two-component jointed perforated cement-bonded composite acoustic plate with geotextile (Geo-II plate) and polyethylene-based rubber layered two-component jointed perforated cement-bonded composite acoustic plate (PE-II plate). The sound absorption properties of all three groups were compared with the fiber-reinforced cementitious plain plate specimen (reference plate), which was tested as a reference specimen in the form of a flat-filled surface without any grooves and perforations. According to the results of the study, when the perforated plate performances are compared with the non-perforated flat plate performances, the absorption property of the flat plate shows an increase in the high frequency band change, while the absorption property of the grooved-perforated sheets shows more effective absorption in the low frequency regions. In addition, the use of polyethylene-based rubber material as an insulation layer provides a highly absorbent and/or excellent absorbent quality depending on the perforation rate to the sound reduction characteristics of cement-bonded acoustic plates in grooved and perforated composite form.

Keywords

Cementitious panel, Groove, Hole, Perforation, Acoustic, Sound absorption

Elyaf Takviyeli Çimentolu Levhaların Derzli-Delikli Akustik Panel Olarak Kullanımında Perforasyon Özelliklerinin Etkisi

Abstract

Perforeli çimentolu levhalar özellikle iç mekân gürültü kontrolünde bir ses emici malzeme olarak kullanılmaktadır. Bu çalışmada, plakaların bir yüzeyinden ortalama 4 mm genişliğinde ve 6 mm derinliğinde oluklar (yarıklar) açılarak bir yüzü oluklu ve derzli form kazandırılmıştır. Çalışma kapsamında akustik performans irdelemesi için üç ayrı perforasyon oranı tasarlanmış olup sırasıyla %5.5, %8.0 ve %12.6 oranları elde edilecek şekilde levha örneklerinin diğer yüzeyinde ortalama 10 mm derinliğinde delikler açılarak perforeli test örnekleri hazırlanmıştır. Bu forma dönüştürülen levhaların ses yutma özellikleri irdelenmiştir. Delikli perforeli test örnekleri için uygulanabilirlik kesitine bağlı olarak 3 ayrı grup numune hazırlanmıştır. Bunlar; tek bileşenli yalın formda derzli perforeli çimento bağlayıcılı akustik levha (Yalın-I levhası), geotekstil katmanlı iki bileşenli derzli perforeli çimento bağlayıcılı kompozit akustik levha (Geo-II levhası) ve polietilen esaslı kauçuk katmanlı iki bileşenli derzli perforeli çimento bağlayıcılı kompozit akustik levha (PE-II levhası). Her üç grubun ses yutma özelliği referans örneği olarak test edilen düz-dolu yüzey formunda herhangi bir derz ve perfore işlemi yapılmamış elyaf takviyeli çimentolu yalın levha örneği (kontrol levhası) ile karşılaştırılmıştır. Çalışma sonuçlarına göre, derzli perforeli form kazandırılmış levha örneklerinin perforesiz düz levha formu performansları ile karşılaştırıldığında görüldüğü üzere düz levhanın absorpsiyon özelliği yüksek frekans band değişiminde artış gösterirken, derzli perforeli levhaların absorpsiyon özelliğinin ise düşük frekans bölgelerinde daha etkin absorpsiyon özelliği göstermektedir. Ayrıca, polietilen esaslı kauçuk malzemenin yalıtım katmanı olarak kullanımı, derzli ve perforeli kompozit formda çimento bağlayıcılı akustik levhaların ses azaltma karakteristiğine perforasyon oranına bağlı olarak yüksek emici ve/veya mükemmel emici birer nitelik kazandırmaktadır.

Keywords

Çimentolu levha, Derz, Delik, Perforasyon, Akustik, Ses yutma

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