Acoustic emission waveform characterization of crack origin and mode in fractured and ASR damaged concrete |
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| Affiliation: | 1. Lyles School of Civil Engineering, Purdue University, 550 Stadium Mall Dr., West Lafayette, IN 47907, USA;2. Department of Structural Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway;3. Materials and Structural Systems Division, National Institute of Standards and Technology, 100 Bureau Drive, Stop 8615, Gaithersburg, MD 20899, USA;1. Lyles School of Civil Engineering, Purdue University, 550 Stadium Mall Dr., West Lafayette, IN 47907, USA;2. Materials and Structural Systems Division, National Institute of Standards and Technology, 100 Bureau Drive, Stop 8615, Gaithersburg, MD 20899, USA;3. Materials Measurement Science Division, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899, USA;1. Smart Structures Research Laboratory (SSRL), Department of Civil, Structural, and Environmental Engineering, University at Buffalo, USA;2. Department of Materials Science and Engineering, University of Ioannina, 45110 Ioannina, Greece;3. Department of Computer Science and Engineering, University of South Florida, FL 33620, USA;4. Department of Mechanics of Materials and Constructions, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium;1. L’UNAM Université, Institut de Recherche en Génie Civil et Mécanique (GeM), UMR-CNRS 6183, Ecole Centrale de Nantes, Nantes, France;2. National University of Computer and Emerging Sciences, Department of Civil Engineering, Lahore, Pakistan;1. Université de Bordeaux, Institut de Mécanique et d’Ingénierie (I2M), Département Génie Civil et Environnemental (GCE), Talence, France;2. RISAM Université de Tlemcen, BP 230, Algeria;3. LUNAM Universite, UMR-CNRS 6183, Ecole Centrale de Nantes, Institut de Recherche en Génie Civil et Mécanique, (GeM), Nantes, France;4. Université de Pau et Pays Adour, Laboratoire des Fluides Complexes et leurs Réservoirs, LFC-R UMR5150, Anglet, France |
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| Abstract: | Different constituents of concrete can have cracking behavior that varies in terms of the acoustic waveform that is generated. Understanding the waveform may provide insight into the source and behavior of a crack that occurs in a cementitious composite. In this study, passive acoustic emission (AE) was used to investigate the waveform properties of the individual components of concrete (i.e., aggregate, paste, and interfacial transition zone (ITZ)). First, acoustic events produced by cracks generated using mechanical loading in a wedge splitting test were detected. It was observed that cracks that occurred through the aggregate have an AE frequency range between 300 kHz and 400 kHz, while cracks that propagated through the matrix (paste and ITZ) have a frequency range between 100 kHz and 300 kHz. Second, tests were performed using samples that were susceptible to alkali silica reaction; and AE and X-ray computed tomography were used to detect cracking. AE events with a frequency range between 300 kHz and 400 kHz were detected at early ages, suggesting the initiation of cracks within reactive aggregate. At later ages, AE events were detected with frequency ranges of 100–300 kHz, indicating crack development and propagation in the matrix. |
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| Keywords: | Acoustic emission Aggregate Alkali silica reaction Concrete Fracture Matrix |
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