蛍光X線分析装置を用いた海洋コンクリート製再生細骨材中の塩化物含有率測定に関する検討

Abstract

This paper describes the applicability assessment of light-element measurable energy dispersive fluorescent X-ray analyzers to estimate the chloride content of recycled fine aggregate produced from waste marine concrete. In this study, various types of chloride-containing recycled fine aggregate were prepared. Then, the water soluble chloride content and the total chloride content of each type of aggregate and its fluorescent X-ray intensity were measured by using non-treated samples of each aggregate and samples crushed to a size of less than 0.15 mm. It was found that the relation between the fluorescent X-ray intensity and the chloride content could be represented by one equation not dependent on the type of aggregate, and that the X-ray intensity had a high correlation with the total chloride content. Furthermore, it was determined that samples crushed to a size of less than 0.15 mm should be used in order to improve the estimate accuracy. Lastly, a procedure for the estimation of the chloride content of fine aggregate produced from waste marine concrete using a light-element measurable energy dispersive fluorescent X-ray analyzer was proposed.本稿では，海洋コンクリート塊から製造した再生細骨材中の塩化物含有率の迅速な測定方法として，可搬式の軽元素対応エネルギー分散型蛍光X線分析装置の適用性を検討した。その結果，蛍光X線強度と再生細骨材中の塩化物含有率の関係は骨材の種類によらない1つの直線式により表現できることがわかった。また，本装置による塩化物含有率推定の精度を向上させるには，0.15mmのふるいを全通する程度まで骨材を粉砕させた試料を用いるべきと考えられた。さらに，本装置を用いた海洋コンクリート製再生細骨材中の塩化物含有率の推定方法の流れを提案した。