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Decalcification of cement concrete structures and dissolution of bitumen by windshield washer fluid

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Title: Decalcification of cement concrete structures and dissolution of bitumen by windshield washer fluid
Other Titles: ウインドーウォッシャー液によるセメントコンクリート構造物の脱カルシウム化とアスファルトの溶出
Authors: Moriyoshi, Akihiro1 Browse this author →KAKEN DB
Tabata, Masayoshi2 Browse this author →KAKEN DB
Kitagawa, Hiromitsu3 Browse this author
Tokumitsu, Katsuya4 Browse this author
Saeki, Noboru5 Browse this author →KAKEN DB
Authors(alt): 森吉, 昭博1
田畑, 昌祥2
北川, 弘光3
徳光, 克也4
佐伯, 昇5
Keywords: Cement concrete
Decalcification
Surfactant
Windshield washer fluid
Ion exchange
Bitumen
Issue Date: 1-Mar-2002
Publisher: Japan Petroleum Institute
Journal Title: Journal of the Japan Petroleum Institute
Volume: 45
Issue: 2
Start Page: 84
End Page: 88
Abstract: A new phenomenon of decalcification of the cement concrete structure and dissolution of bitumen in bituminous pavement is described, caused by the surfactants included in the windshield washer fluid of automobiles. Decalcification occurs in cement concrete samples in the laboratory even at low concentrations of surfactant of 25ppm. Recently, foam with fine bubbles have been observed in the water on pavement just after rain worldwide. The decalcification reaction was identified as an ion exchange reaction between the calcium ions Ca2+ in the concrete and Na+ in the surfactants using the electron spectroscopy for chemical analysis (ESCA) method. Bitumen was also found in the decalcified cement concrete, from which the Ca component had dissolved out gradually with time.
アスファルト舗装で雨の降り始めに見られる表面水の細かい泡はウインドーウォッシャー液中の界面活性剤が主な原因であり,この泡は日本だけでなく世界中で観測されている。本論文は,自動車用のウインドーウォッシャー液中の界面活性剤が25ppmの低濃度でもセメントコンクリート構造物中のセメントの脱カルシウム化をもたらすことを道路沿いの種々のセメントコンクリート構造物,および実験室の作製供試体の浸漬実験やESCA法等から最初に明らかにした。すなわち,本研究は陰イオン系の界面活性剤を有するウインドーウォッシャー液中のNa+等がセメント中のCa2+と急速に化学反応し,セメントの主要鉱物であるCa成分が次第に外部に溶け出すこと,また戸外で採取した脱カルシウム化したセメントコンクリート構造物には界面活性剤とアスファルトが内部に蓄積されていることを見い出した。
Type: article
URI: http://hdl.handle.net/2115/40067
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 森吉 昭博

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