土を用いた機能賢材(<シンポジウム特集>生活空間・身の回りの粘土 : 粘土圏環境における粘土の利用)

概要

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Indoor climate controlling soil based materials were investigated for a sustainable technology. Hydrothermal reaction of soil and low temperature calcination of allophane were applied aiming at decreasing input energy and natural resources. Soil generally contains higher amount of Al_2O_3, yielding the formation of large hydrogarnet crystals as the prevention factor of the strength development of hydrothermal solidification. It was found that the formation of nano-sized hydrogarnet crystals by the controlling of reaction condition enables the strength development on the hydrothermal solidification of soil. Furthermore, the formation of mesoporous structure was suitable for the application to the humidity controlling materials or adsorption materials. For the low temperature calcination, allophane containing soil was used because of its high adsorption-desorption ability. The addition of waste glass additives enables the strength development and higher humidity controlling property simultaneously even at low firing temperature of 900℃. The room temperature and relative humidity in a house with the soil based material was measured, showing the effects of keeping the relative humidity, reducing dew condensation, and reduction of the energy utilized for living.
2005-04-05