Abstract
A new recycling process of coal flyash exhausted from a coal fired power plant and polymer waste was studied. In this paper, we proposed a novel process to prepare coal flyash/polymer waste composite for a sound absorbing wall. First, granules with diameter of 2.5-5mm or 5-10mm were made from the coal flyash, and then calcinated to improve the strength of granules. During the granulation operation, we also investigated the effect of additive of bentonite on the strength of granules. The surface of granules were coated by mixing the heated granules with the crushed polymer. These coated granules were then heat-molded, and a composite sound absorbing wall was obtained. The conditions and material properties during the process were examined, and the sound absorption coefficient of the composite was evaluated for the application to sound absorbing wall for highway roads.
