Piezoresistive Properties of Natural Hydraulic Lime Binary Pastes with Incorporated Carbon-Based Nanomaterials under Cyclic Compressive Loadings.

Angeliki-Eirini Dimou, Zoi S Metaxa, Stavros K Kourkoulis, Nikolaos D Alexopoulos

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Article in Nanomaterials (Basel, Switzerland), 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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4 authors.

Angeliki-Eirini DimouResearch Unit of Advanced Materials, Department of Financial Engineering, School of Engineering, University of the Aegean, 82132 Chios, Greece.ORCID 0000-0003-4093-5110

Zoi S MetaxaDepartment of Chemistry, International Hellenic University, St. Luke, 65404 Kavala, Greece.ORCID 0000-0001-6588-4298

Stavros K KourkoulisLaboratory of Testing and Materials, Department of Mechanics, National Technical University of Athens, 15780 Athens, Greece.ORCID 0000-0003-3246-9308

Nikolaos D AlexopoulosResearch Unit of Advanced Materials, Department of Financial Engineering, School of Engineering, University of the Aegean, 82132 Chios, Greece.ORCID 0000-0001-7851-1845

Funding

European Regional Development Fund (ERDF) and the Greek State by the Research e- Infrastructure "Interregional Digital Transformation for Culture and Tourism in Aegean Archipelagos", which is implemented within the framework of the "Regional Excellence" MIS 5047046European Regional Development Fund of the European Union and Greek national funds through the Operational Program Competitiveness, Entrepreneurship, and Innovation, under the call RE-SEARCH - CREATE - INNOVATE MIS 5031866

6 · The paper itself

Abstract

Natural Hydraulic Limes (NHL) are extensively used for the restoration of Monuments of Cultural Heritage, often combined with pozzolanic materials, such as natural pozzolans and metakaolin etc. In the present study, five (5) different cases of binary lime-based pastes composed of a specific type of NHL (NHL5) and metakaolin as pozzolanic addition were examined, that were reinforced with carbon nanostructures, namely graphene and carbon nanotubes. For the first time in restoration mortars, the incorporation of carbon nanostructures was investigated, aiming to produce materials with adequate piezoresistive response, so that they have the potential to be exploited for in situ structural health monitoring. The compressive strength, flexural strength, electrical resistance and piezoresistive response of the composite pastes was examined. The results showed that all modified carbon nanostructures lead to a significant reduction in electrical resistance. The pastes reinforced with 2D nanostructures (graphene family) displayed up to 30% increase in compressive strength and the pastes reinforced with 1D nanostructures (carbon nanotubes) displayed enhanced flexural strength (up to 100% increase). Piezoresistivity was attained for almost all investigated pastes, nevertheless the graphene oxide (GO) was considered as optimal reinforcement as the sensing ability of such pastes was found to be almost proportional to the applied compressive load level.

Indexed as

carbon nanomaterialscarboxylated CNTscarboxylated graphenegraphene oxidemetakaolinnatural hydraulic limereduced graphene oxidesulfonated CNTs

Identifiers

PMID36296884

DOI10.3390/nano12203695

PMCPMC9610883

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