1-عطية، محمد عطية واخرون، الانسان والبيئة، دار الحامد للنشر، الاردن، 2011.
2-المعموري، حمزة سلمان، المطيري محمد علي، اثر الخصائص المستدامة في الاعتدال الصوتي للقاعات الدراسية، مجلة جامعة بابل للعلوم الهندسية، المجلد 23، العدد 1، 2015، 16-26.
Hawkins T. Studies and research regarding sound reduction materials with the purpose of reducing sound pollution. M.Sc Thesis, California Polytechnic State University; 2014.
Gong X. Vibration and acoustic performance of in-plane honeycomb sandwich panels. M.Sc Thesis, Clemson University; 2012.
Cotana C. Acoustic tests on original concrete and inert mixture materials. 14th International Congress on Sound and Vibration in Cairns Australia: Proceedings of the 14th Australasian Conference on the Mechanics of Structures of Materials, ASS, Cairns; 2007.
Tikrit Journal of Engineering Sciences (2017) 24(2) 77-85
Noise Isolation Capability for a Range of Construction Materials used in Iraq
|Qusay K. Al-Ahmady||Muthana K. Abed|
|Mosul University, Iraq||North Refinery Company, Baji, Iraq|
This study deals with the ability of noise isolation for some type of concrete block used in Iraq. These materials are divided into groups and the noise isolation of these materials is tested by a device made locally. The results of these materials are compared and the following conclusions are reached: the sound isolation increases generally with the increase of the frequency, the increase is not linear but vibrated and a relative decrease in the sound insolation is noticed for the frequencies from 2000 Hz to 4000 Hz. The sound isolation increases with the increase of density of the material and vice versa. The sound isolation increases with the increase of the thickness if the density is stable. The sound isolation increases with the increase of the thickness of gap between two layers of a material and the highest value of the loss of sound transition corresponds a highest value of reducing of noise level. The lowest value of the noise reduction index corresponds to the lowest value of reducing of noise level. The most effective materials in reducing noise of the materials tested in this research are the solid concrete block to which a layer of Sandwich panel is added. The error percentage was less than 10%, particularly at the frequencies less than 1000 Hz.
Keywords: Noise pollution, sound insulation, sound transmission loss, soncrete block.