»A Pilot Study on the Development of an Ecological, Unperforated Sound Absorptive Material

Awareness of the nature has a limited capacity and the consideration that the future generations are in danger due to the rapid waste with the development of technology in the last century, is leading to sustainability and green building design concept. The hazardous effects of the industrial materials are coming out, thus, healthier, natural materials and production methods are being discovered to design healthier interior environments.


Architectural acoustics requirements are one of the vital topics to provide healthy and comfortable environments. The materials that are consumed in Turkey to provide acoustical comfort   requirements in terms of room and building acoustics are commonly synthetic fibers, such as glass wool and rock wool or perforated materials consisting of those fibers. The preference by architects is mostly smooth, unperforated and plain sound absorbers because of aesthetical reasons. This kind of materials frequently imported from other countries with high costs and yet, that are supported with synthetic fibers. Rock wool and glass wool are hazardous for respiration; furthermore physical touch may induce itching. Moreover, synthetic fibers, such as glass wool and rock wool are produced with high energy demands in addition to transportation costs which result in high carbon footprints. The investigation of ecological and natural materials is indispensable to provide acoustical requirements considering the health and energy efficiency.


This study is focused on the development of a sound absorptive material having smooth surface and ecological features. The material is made of pumice which has large reserves in Turkey and reed, which grows in wet areas such as rivers and lakes. The binding agent for the pumice is lime, which is a more ecological binder compared with cement and gypsum products in terms of energy efficiency and acoustical performance. The selected materials are found to have great potential for improved acoustical performances in addition to being economic and ecological. The measurements of the composite acoustical performance are realized with Impedance Tube.