Water Moisture Adsorption Characteristics of Heat-treated Ceramic Siding Waste Powder

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  • 熱処理した窯業系サイディング粉末の水蒸気吸着挙動

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In this study, the water moisture adsorption isotherms of ceramic siding waste powder samples heated at 650, 700, 800, 900 and 1000°C were measured to evaluate hydroscopic property changes resulting from heat treatment. The amount of adsorbed moisture decreased as the heat treatment temperature was raised because the organic material in the ceramic siding waste powder was removed and the specific surface area and pore volume were decreased by heat treatment. In addition, the amount of adsorbed moisture on the ceramic siding waste powder heated at 650, 700 and 800°C was increased by dry and wet cycle treatment, though specific surface area, gel pore and capillary pore volume were decreased. From this result, it was conjectured that micro pores such as intraglobular pores in calcium silicate hydrate (CSH) were formed by dry and wet cycle treatment of these heated ceramic siding waste powder samples. In contrast, the amounts of adsorbed moisture on ceramic siding waste powder heated at 900 and 1000°C changed little. Therefore, ceramic siding waste powder could be used for applications requiring low hygroscopicity by heating it over 900°C.

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