Characteristics of sound absorption materials by using ecological aggregates
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초록
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 1125oC/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.
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 1125oC/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.
참고문헌 (9)
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