METHOD FOR MEASURING CONCENTRATION OF CHLORIDE ION IN CONCRETE STRUCTURE USING LASER-INDUCED BREAKDOWN SPECTROSCOPY

To provide a measurement method capable of obtaining the result substantially coincident with concentration distribution of chloride ions acquired by potentiometric titration, in a case of measuring salinity of concrete with LIBS using a wet sampled specimen.SOLUTION: When measuring the concentration of chloride ions by laser-induced breakdown spectroscopy by sampling a wet specimen from a concrete structure, after removing the surface of the specimen having come into contact with water, the position where the surface has been removed is irradiated with a pulsed laser beam so that the main measurement for chloride ion concentration is performed by the laser-induced breakdown spectroscopy.SELECTED DRAWING: None 【課題】コンクリートの塩分を湿式で採取した試験体を使ってＬＩＢＳで計測する場合に電位差滴定法で求めた塩化物イオン濃度分布とほぼ一致する結果が得られる計測方法を提供する。【解決手段】コンクリート構造物から湿式で試験体を採取してレーザ誘起ブレイクダウン分光法で塩化物イオン濃度を計測する際に、試験体の水と接触した表面を取り除いた後に、表面が除去された位置にパルスレーザ光が照射されてレーザ誘起ブレイクダウン分光法による塩化物イオン濃度計測の本計測が実施されるようにしている。【選択図】なし