PRODUCTION METHOD OF SOUND ABSORPTION TYPE SOUND PROOFING PANELS USING LIGHTWEIGHT AGGREGATE OF BOTTOM ASH

A sound absorption type sound proofing panel manufacturing method using lightweight aggregates of bottom ash is provided to produce lightweight sound proofing panels by combining a rear plate with a metal plate instead of concrete by using the lightweight aggregates extracted from the bottom ash. The sound absorption type sound proofing panel manufacturing method using lightweight aggregates of bottom ash comprises a sound absorbing material producing process comprising the steps of mixing the lightweight aggregates generated as by-products of a power plant and buried in an ash disposal site, a binder, water, and a water reducing agent, injecting the mixture into a mold, curing the mixture filled into the mold, and separating the cured mixture from the mold, and a sound insulating material connecting process for connecting a concrete or galvanized steel plate to a sound absorbing material. The lightweight aggregate is bottom ash with the grain size of 1.25~5mm sorted from the buried bottom ash. The main component of the binder is cement. The water reducing agent is polycarbonate, melamine, or naphthalene. The binder contains Portland cement of 85~95vol.% and fly ash of 5~15vol.%. The mixture is produced by mixing the lightweight aggregate of 45~55vol.%, the binder of 25~35vol.%, the water of 20~25vol.%, and the water reducing agent of 1vol.% to the volume percent of the water. The binder and the lightweight aggregate are agitated for 30~180 seconds, the water and the water reducing agent are added and stirred for 30~180 seconds, and then the mixture is injected into the mold.