PSI - Issue 28

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 28 (2020) 1694–1701

© 2020 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 the European Structural Integrity Society (ESIS) ExCo The aim of the present work is to study a binary paste matrix applied for the development of Cultural Heritage restoration mortars, which incorporates modified carbon nanomaterials as reinforcement. In specific, a mixture of natural hydraulic lime and metakaolin was examined. The incorporation of two different, nanomaterials was studied, namely reduced graphene oxide and carboxylated carbon nanotubes. Both types of nano-reinforcement were added at a concentration of 0.15 wt % of the binder. The pastes were studied through mechanical tests (compression, flexure), as well as electrical resistance measurements. The mechanical tests showed that the flexural strength is significantly increased when the carboxylated carbon nanotubes are added, due to the anchoring capability of the nanotubes. The addition of reduced graphene oxide increases the compressive strength of the paste, while for both nano-reinforcements a decrease in electrical resistance is recorded that indicates a good distribution of the electrically conductive nanomaterials within the binder, forming an efficient electrical network. The experimental test results strongly indicate the potential use of the nano-composite binder for the structural health monitoring of cultural heritage architectural monuments. © 2020 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 the European Structural Integrity Society (ESIS) ExCo Keywords: natural hydraulic lime pastes; reduced graphene oxide; multiwall carbon nanotubes 1 st Virtual European Conference on Fracture Mechanical and electrical properties of hydraulic lime pastes reinforced with carbon nanomaterials Angeliki-Eirini Dimou a , Christina-Margarita Charalampidou a , Zoi S. Metaxa b , Stavros K. Kourkoulis c , Ioannis Karatasios d , Georgios Asimakopoulos e , Nikolaos D. Alexopoulos a* a University of the Aegean, School of Engineering, Department of Financial Engineering, 821 32 Chios, Greece b International Hellenic University, School of Science and Technology, Department of Chemistry, St. Luke 654 04, Kavala, Greece c National Technical University of Athens, Department of Mechanics, Laboratory for Testing and Materials, 157 80 Athens, Greece d National Centre for Scientific Research ”Demokritos”, Institute of Nanoscience and Nanotechnology, 153 41 Aghia Paraskevi, Greece e University of Ioannina, Department of Materials Science & Engineering, 451 10 Ioannina, Greece Abstract

* Corresponding author. Tel.: +30 22710 35464 E-mail address: nalexop@aegean.gr

2452-3216 © 2020 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 the European Structural Integrity Society (ESIS) ExCo

2452-3216 © 2020 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 the European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.10.144