Concrete Research and Technology

Featured article

Volume 36 (2025) Pages 61-69

Deterioration Mechanism of Protective Coating Materials for Anti-corrosion in Sewage Facilities Under Long-term Service Environment

Kenichi Fujisawa, Ryuta Imai, Nobuhiro Chijiwa, Manabu Fujii

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.

Editor's pick

Best Paper of 2026 (2025.7～2026.5) selected by CRT

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2026 Volume 37

Response Displacement Prediction Equations for Low- to Mid-Rise RC Buildings Considering Damping Performance under Inland Crustal Earthquake Ground Motions Yoshinori Ito, Koichi Kusunoki
Prediction Method for Anomalies in Concrete Structures Considering Carbonation and Water Ingress Tomohisa Kamada, Vu Viet Cuong, Toshiharu Kishi
Damage Classification of Precast Concrete Column Post-Tensioned by Unbonded Tendons Based on Limit States Kentaro Matsunaga, Masanori Tani, Hiroshi Shinjo, Kenji Tano
Development and Validation of a Monitoring System Using Two Accelerometers for Damage Assessment of RC Residential Buildings Narumi Ougiya, Syun Yoshino, Takuma Eguchi, Keiji Kitajima

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