PSI - Issue 64

First page Table of contents Previous page 46 Next page Last page

ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000 Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 64 (2024) 1790–1797

SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Acoustic Emission monitoring of OPC mortars at elevated temperatures in fracture tests Hernán Xargay a,b,c *, Alejandra Vesga-Ramírez a,c,d , Marianela Ripani b,c , Martín Gómez a,d and Paula Folino b,c a Comisión Nacional de Energía Atómica (CNEA), Departamento ICES, Av. Gral. Paz 1499, San Martín B1650, Argentina b Universidad de Buenos Aires, Facultad de Ingeniería, LMNI-FIUBA, Av. Gral. Las Heras 2214, CABA C1126, Argentina c CONICET - Universidad de Buenos Aires, Instituto de Tecnologías y Ciencias de la Ingeniería “Hilario Fernández Long” (INTECIN), Av. Paseo Colón 850, CABA C1063, Argentina d Universidad Tecnológica Nacional, Facultad Regional Delta (GEA-UTN-FRD), San Martín 1171, Campana B2804, Argentina Abstract The action of moderate and high temperatures produces the degradation of main physical and mechanical properties of Ordinary Portland Cement (OPC) composites. As an example, from an application point of view and at a structural level, the case of concrete radiation shielding containers in nuclear facilities can be mentioned, which can be severely affected by thermal cracking. In this work, the results of Acoustic Emission (AE) monitoring of mortar prismatic specimens under three-point bending tests are analyzed. Samples are firstly submitted to a heating treatment in an electrical furnace, with maximum target temperatures ranging between 100 to 600 ºC. After the heating process, the prisms were cooled down and finally, mechanically tested, i.e. under residual conditions. The AE signals were continuously recorded during each bending test and its characteristics at different loading stages were explored, scrutinizing variations in AE parameters, such as event rise time, amplitude and energy. Additionally, average frequency (AF) and RA value parameters were employed to assess fracture modes aiming to highlight situations where tension or shear/mixed modes predominate through the test. A comparative analysis of the AE characteristics during loading path and progressive damage is presented. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers Keywords: OPC mortar; Acoustic Emission; Temperature; Three-point bending tests SMAR 2024 – 7th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures Acoustic Emission monitoring of OPC mortars at elevated temperatures in fracture tests Hernán Xargay a,b,c *, Alejandra Vesga-Ramírez a,c,d , Marianela Ripani b,c , Martín Gómez a,d and Paula Folino b,c a Comisión Nacional de Energía Atómica (CNEA), Departamento ICES, Av. Gral. Paz 1499, San Martín B1650, Argentina b Universidad de Buenos Aires, Facultad de Ingeniería, LMNI-FIUBA, Av. Gral. Las Heras 2214, CABA C1126, Argentina c CONICET - Universidad de Buenos Aires, Instituto de Tecnologías y Ciencias de la Ingeniería “Hilario Fernández Long” (INTECIN), Av. Paseo Colón 850, CABA C1063, Argentina d Universidad Tecnológica Nacional, Facultad Regional Delta (GEA-UTN-FRD), San Martín 1171, Campana B2804, Argentina Abstract The action of moderate and high temperatures produces the degradation of main physical and mechanical properties of Ordinary Portland Cement (OPC) composites. As an example, from an application point of view and at a structural level, the case of concrete radiation shielding containers in nuclear facilities can be mentioned, which can be severely affected by thermal cracking. In this work, the results of Acoustic Emission (AE) monitoring of mortar prismatic specimens under three-point bending tests are analyzed. Samples are firstly submitted to a heating treatment in an electrical furnace, with maximum target temperatures ranging between 100 to 600 ºC. After the heating process, the prisms were cooled down and finally, mechanically tested, i.e. under residual conditions. The AE signals were continuously recorded during each bending test and its characteristics at different loading stages were explored, scrutinizing variations in AE parameters, such as event rise time, amplitude and energy. Additionally, average frequency (AF) and RA value parameters were employed to assess fracture modes aiming to highlight situations where tension or shear/mixed modes predominate through the test. A comparative analysis of the AE characteristics during loading path and progressive damage is presented. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers Keywords: OPC mortar; Acoustic Emission; Temperature; Three-point bending tests © 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers

* Corresponding author. E-mail address : hxargay@fi.uba.ar * Corresponding author. E-mail address : hxargay@fi.uba.ar

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers 2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of SMAR 2024 Organizers

Made with FlippingBook Digital Proposal Maker