Abstract

This paper presents an experimental study on monitoring the deterioration in Reinforced Concrete (RC) and Steel Fiber Reinforced Concrete (SFRC) beams under simultaneous corrosion exposure and sustained loading using Acoustic Emission (AE) Technique. AE method can be effectively used to detect damage initiation and progression of micro and macro-cracking during the entire period of corrosion in RC as well as SFRC beams. Addition of steel fibers in concrete leads to delay in AE parameters of AE hits and AE energy, revealing that SFRC beams can sustain the corrosion exposure for longer duration due to their crack-arresting properties. This study also reveals that beams subjected to simultaneous corrosion exposure and sustained loading are susceptible to brittle failure with reduced load carrying capacity and this is well depicted by increased AE activity.

摘要

本文介绍了使用声发射 (AE) 技术监测钢筋混凝土 (RC) 和钢纤维增强混凝土 (SFRC) 梁在同时腐蚀暴露和持续载荷下的劣化情况的实验研究。AE 方法可有效地用于检测 RC 和 SFRC 梁在整个腐蚀期间的损伤萌生和微裂纹和宏观裂纹的进展。在混凝土中添加钢纤维会导致 AE 命中和 AE 能量的 AE 参数延迟，表明 SFRC 梁由于其止裂性能而可以承受更长时间的腐蚀暴露。