Preparation of Smoked Roof Tiles Using Waste Roof Tile
Takeshi SHIONO, Masahisa ASADA, Masaki SAKATA, Keisuke HIROTA and Yasunori OKAMOTO
Abstract:Porcelain roof tiles are very popular in Japan. In Kyoto, in particular, smoked roof tiles are preferred for temples, shrines and even home. A volume of roof tiles are taken out as an industrial waste, with building renovation and housing rehabilitation. Such tiles have been discarded in landfills in the past. Decrease in landfills and demand of reduction of such waste promote to recycle the waste roof tile. On the contrary, clay with good quality for roof tile is being depleted. In order to decrease fraction of roof tile clay used in producing the tile, in the preset study, waste roof tile was recycled for the production of the new tile. In consequence, green compacts with waste roof tiles were sintered by conventional method and the mechanical and water-resistant properties were improved. However, smoking process was insufficient. Beautiful smoked tiles could not be prepared, resulting from formation of glassy phase on the tiles. Control of sintering temperature makes it successful to prepare the tiles with almost the same shrinkage and water absorption of tile prepared with only roof tile clay without waste tile. Key Words:Roof tile, Smoking, Recycle, Water absorption, Strength