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Title
Japanese:下水道施設における防食被覆材の長期供用環境下における劣化機構 
English:Deterioration Mechanism of Protective Coating Materials for Anti-corrosion in Sewage Facilities Under Long-term Service Environment 
Author
Japanese: 藤澤 健一, 今井 隆太, 千々和 伸浩, 藤井 学.  
English: Kenichi Fujisawa, Ryuta Imai, Nobuhiro Chijiwa, Manabu Fujii.  
Language Japanese 
Journal/Book name
Japanese:コンクリート工学論文集 
English:Concrete Research and Technology 
Volume, Number, Page Vol. 36        pp. 61-69
Published date Sept. 15, 2025 
Publisher
Japanese: 
English: 
Conference name
Japanese: 
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Conference site
Japanese: 
English: 
Official URL https://www.jstage.jst.go.jp/article/crt/36/0/36_61/_article/-char/ja
 
DOI https://doi.org/10.3151/crt.36.61
Abstract Surface protection methods are primarily employed to mitigate sulfuric acid-induced deterioration in sewerage facilities. While laboratory-scale accelerated testing has been conducted to examine the sulfuric acid resistance of surface protective coatings, little research has been done in actual facilities, and the mechanism of sulfuric acid penetration and structural deterioration remains unclear. This study investigated the effects of surface protective coatings in actual facilities with approximately 20 years of service to shed light on the long-term deterioration mechanism. A series of analyses revealed that, in environments where sulfuric acid is present, the acid can penetrate the protective coating material and gradually deteriorate the underlying concrete. Furthermore, the pH drop caused by sulfuric acid was observed to extend beyond the neutralization depth zone, affecting the structural integrity of the hardened concrete.

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