항만 상치 콘크리트 품질 관리를 위한 비파괴 스캐닝 기법 비교 연구
Comparative Study on NDT Techniques for Evaluation of Concrete Quality Exposed to Marine Environment
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초록
부두 안벽의 주요 재료인 콘크리트는 염해 환경에 직접적으로 노출되어 있으며, 특히 상치 콘크리트는 선박 계선 및 상·하역 작업이 반복적으로 이루어지는 특성 상 품질 저하 속도가 상대적으로 빠르다. 콘크리트 품질은「시설물 안전 및 유지관리 실시 세부지침」에 의해 점 단위 샘플링을 통해 평가되며, 샘플링 위치에서의 결과값이점검단위를 대표한다. 본 논문에서는 대면적에 해당하는 상치 콘크리트를 대상으로 다양한 비파괴 스캐닝 기법을 적용하여 면적 단위 품질 관리 방안을 검토하였다. 그 결과, 계선 작업 구간에서 열화가 집중적으로 발생함을 초음파어레이 이미징 및 GPR 스캐닝 결과로부터 확인할 수 있었으며, 기존의 샘플링 기반 초음파 속도(UPV), 반발경도값을 통해서는 품질 저하와 관련한 정확한 판단이 어려웠다.
Abstract
Concrete, the primary material used in quay walls, is directly exposed to saline environments. Coping concrete, particularly in areas where periodic berthing and loading/unloading occur, is prone to rapid quality deterioration. Current facility safety and maintenance guidelines assess concrete durability at specific points through sampling, which are intended to represent the entire inspection unit. This paper explores quality management strategies from an areal perspective by applying various non-destructive scanning methods to extensive areas of coping concrete. Ultrasonic array imaging and ground-penetrating radar scanning images revealed significant quality degradation in berthing operation areas, whereas sampling-based ultrasonic pulse velocity and rebound hardness values were less effective in detecting this degradation.
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