廃シリカゲルを再利用したセラミック基盤を持つコケ緑化材の蒸発熱による日射熱低減効果

抄録

To recycle silica byproducts and to moderate the heat-island phenomenon, a porous ceramic was prepared by mixing waste silica powder with clay and then firing the resultant mixture. The high water-absorption capacity of the ceramic was used to produce a greening material: a moss-covered porous ceramic. To examine the suppression ability of the temperature increase caused by solar-radiant heat on the moss-covered ceramic as well as to clarify the influence of water absorption in the sample on the temperature increase suppression effect, the surface temperature change of a moss-covered sample during solar radiant heat reception and the amount of water evaporated from the sample were measured simultaneously. Furthermore, to verify whether the moss-covered ceramic can reduce the indoor temperature, the heat flux acting between the sample rear surface and the rooftop floor of a testing structure was measured. The experimental results confirmed that the moss-covered and ceramic samples that could absorb sufficient water could suppress the temperature increase caused by solar radiant heat, and the moss-covered sample could suppress it for a longer time when compared to the ceramic sample.