Abstract
Piezoceramic based smart aggregate (SA) has been employed to monitor the strength development of early age concrete. The validity of SA-based active sensing method was tested and verified with loading and unloading conditions. However, the early age concrete in buildings is subjected to many load increments during the construction process. The influence of incremental load on the properties of the propagating waves is still unclear. This study aims to investigate the effects of axial stage loads on the signal response of the SA. The concrete specimens that are embedded with SA’s were loaded step by step, and the amplitude and wave velocity of the sensing signals were measured at each stress state. The experimental results indicated that the amplitude of the received signal decrease with the increase of the stress level. As for the velocity of the propagated stress wave, however, the velocity shows an increasing trend before a sharp decline at high stress level.
Highlights
IntroductionThe use of experimental techniques for monitoring the development of microstructure, durability, and mechanical properties of cement-based materials, such as impedance spectroscopy [1,2,3]and electrical resistivity [4,5], has become very popular
Nowadays, the use of experimental techniques for monitoring the development of microstructure, durability, and mechanical properties of cement-based materials, such as impedance spectroscopy [1,2,3]and electrical resistivity [4,5], has become very popular
Structural health monitoring (SHM) technology based on piezoelectric materials has been widely applied to concrete structures [6,7]
Summary
The use of experimental techniques for monitoring the development of microstructure, durability, and mechanical properties of cement-based materials, such as impedance spectroscopy [1,2,3]and electrical resistivity [4,5], has become very popular. The use of experimental techniques for monitoring the development of microstructure, durability, and mechanical properties of cement-based materials, such as impedance spectroscopy [1,2,3]. Structural health monitoring (SHM) technology based on piezoelectric materials has been widely applied to concrete structures [6,7]. Piezoceramic based smart aggregate has been developed rapidly since being proposed and introduced by Song [8]. Some researchers investigated on the potential usage of smart aggregate (SA’s) in SHM through laboratory tests. The results demonstrated that the piezoelectric based SA transducer is capable of monitoring the damage induced by different kinds of loads
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