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论文类型：期刊论文

发表时间：2015-11-01

发表刊物：SMART MATERIALS AND STRUCTURES

收录刊物：SCIE、EI、Scopus

卷号：24

期号：11

ISSN号：0964-1726

关键字：crack detection; leakage monitoring; active sensing approach; piezoceramic; reinforced concrete pipe

摘要：Reinforced concrete underground pipelines are some of the most widely used types of structures in water transportation systems. Cracks and leakage are the leading causes of pipeline structural failures which directly results in economic losses and environmental hazards. In this paper, the authors propose a piezoceramic based active sensing approach to detect the cracks and the further leakage of concrete pipelines. Due to the piezoelectric properties, piezoceramic material can be utilized as both the actuator and the sensor in the active sensing approach. The piezoceramic patch, which is sandwiched between protective materials called 'smart aggregates,' can be safely embedded into concrete structures. Circumferential and axial cracks were investigated. A wavelet packet-based energy analysis was developed to distinguish the type of crack and determine the further leakage based on different stress wave energy attenuation propagated through the cracks.