Ultrasonic broadband signals monitoring of glass-fiber reinforced cement (GRC) bending tests |
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| Affiliation: | 1. ICITECH, Universitat Politècnica de València, Camino de Vera, s/n 46022 Valencia, Spain;2. ITEAM, Universitat Politècnica de València, Camino de Vera, s/n 46022 Valencia, Spain;1. Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin, 150080, China;2. School of Civil Engineering and Architecture, Heilongjiang University, Harbin, 150080, China;3. University of Lille, CNRS, Centrale Lille, LaMcube, UMR9013, 59000, Lille, France;1. School of Highway, Chang''an University, Xi''an 710064, China;2. National and Local Joint Engineering Materials Laboratory of Traffic Engineering and Civil Engineering, Chongqing Jiaotong University, 400074, China;3. School of Materials Science and Engineering, Chang''an University, Xi''an 710061, China;4. Engineering Research Central of Pavement Materials, Ministry of Education of P.R. China, Chang''an University, Xi''an 710061, China |
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| Abstract: | In this study, complete ultrasonic monitoring of Glass-fiber Reinforced Cement plates under bending tests was addressed. In this kind of experiment, the mechanical properties of the specimen continuously change during the test, thus, the acquisition time of the ultrasonic signals is a critical variable. In order to overcome this drawback, a new ultrasonic procedure based on broadband signals (chirp) has been applied. Following this line of thought, the analysed ultrasonic parameters have been split into the parameters that only depend on time, and those that depend on both time and frequency. In particular, the frequency dependent attenuation parameter allows characterizing the evolution of the plate being damaged over a wide frequency range and significantly detecting the main two events happening during the experiment: the first crack and the maximum stress point. In short, this paper demonstrates the suitability of ultrasonic broadband signals for characterizing fiber-reinforced cementitious composites under bending stress. |
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| Keywords: | Glass fibres Process monitoring Reinforced cement/plaster Ultrasonics Mechanical testing |
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