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Characteristics of sound absorption materials by using ecological aggregates  

Kim, Kang-Duk (Department of Materials Engineering, Kyonggi University)
Ryu, Yu-Gwang (Department of Materials Engineering, Kyonggi University)
Kim, Yoo-Taek (Department of Materials Engineering, Kyonggi University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.18, no.6, 2008 , pp. 264-270 More about this Journal
Abstract
Ecological lightweight aggregates were made by using the wastes come from various industrial fields. Wastes were crushed and pulverized by mills and a certain portions of wastes were mixed and formed by pelletizer like small beads. The formed lightweight aggregates were finally sintered with $1125^{\circ}C$/15 min conditions by using rotary kiln. Lightweight concrete sound absorbers were made of ecological lightweight aggregates K73 (Coal bottom ash 70 wt%: Dredged soil 30 wt%) and K631 (Clay 60 wt%: Stone sludge 30 wt%: Spent bleaching clay 10 wt%). For the reference, lightweight concrete sound absorbers made of DL (German made 'L' company LWA) were also made under the same conditions. Sound absorption characteristics were observed and measured according to the kinds of aggregates, water/cement ratio (W/C=20, 25, and 30%), and designed pore rates (V=20, 25, and 30%). The pore rates of the lightweight concrete sound absorber were turned out to be 5 to 10% higher than designed ones. Absorption coefficient of the lightweight concrete sound absorber by using K631 aggregates with W/C=20% and V=25% conditions was 0.88 at 1000 and 3150 Hz from the measurement by the impedance tube.
Keywords
Ecological aggregates; Sound absorption; Lightweight; Impedance tube; Pore;
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  • Reference
1 H.J. Lee and J.S. Kim, "The effects of noise barrier in reducing road traffic noise and related problems", J. of Ksee. 26(10) (2004) 1166
2 Korea concrete institute, "Advanced concrete engineering for special uses", Kimundang, Korea (2004)
3 KS F 2814; Determination of sound absorption coefficient and impedance in impedance tubes, Korea Standards Association (2001)
4 S.B. Park, J. Lee and D.S. Seo, "A study on the quality properties of porous concrete for pavement using silica fume and steel fiber", J. of KSRE 7(3) (2005) 31
5 Korea concrete institute, "New concrete engineering", Kimundang, Korea (2007)
6 M.C. Lim, "The preparation of sound absorption plate for photocatalytic property using industrial wastes", J. Environ. Hi-Tech. 9 (1998) 89
7 J.S. Kim, L.F. Cohn and K.S. Kim, "A study on the effects of absorptive treatment for the highway noise barriers", J. Kor. Soc. for Noise and Vibration Eng. 8(1) (1998) 146
8 J.F. Allard, Y. Champoux and C. Depollier, "Modelization of layered sound absorption materials with transfer matrices", J. Acoustic Soc. Am. 82(5) (1987) 1792   DOI
9 K.W. Kim, K.S. Yang and J.S. Kang, "Study on the sound absorption properties of noise barrier according to the compositions of absorptive material", J. Kor. Soc. for Noise and Vibration Eng. (2002) 1222