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Carbon Nanofiber Cement Sensors to Detect Strain and Damage of Concrete Specimens Under Compression

Cement composites with nano-additions have been vastly studied for their functional applications, such as strain and damage sensing. The capacity of a carbon nanofiber (CNF) cement paste has already been tested. However, this study is focused on the use of CNF cement composites as sensors in regular...

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Detalles Bibliográficos
Autores principales: Galao, Oscar, Baeza, F. Javier, Zornoza, Emilio, Garcés, Pedro
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5746903/
https://www.ncbi.nlm.nih.gov/pubmed/29186797
http://dx.doi.org/10.3390/nano7120413
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author Galao, Oscar
Baeza, F. Javier
Zornoza, Emilio
Garcés, Pedro
author_facet Galao, Oscar
Baeza, F. Javier
Zornoza, Emilio
Garcés, Pedro
author_sort Galao, Oscar
collection PubMed
description Cement composites with nano-additions have been vastly studied for their functional applications, such as strain and damage sensing. The capacity of a carbon nanofiber (CNF) cement paste has already been tested. However, this study is focused on the use of CNF cement composites as sensors in regular concrete samples. Different measuring techniques and humidity conditions of CNF samples were tested to optimize the strain and damage sensing of this material. In the strain sensing tests (for compressive stresses up to 10 MPa), the response depends on the maximum stress applied. The material was more sensitive at higher loads. Furthermore, the actual load time history did not influence the electrical response, and similar curves were obtained for different test configurations. On the other hand, damage sensing tests proved the capability of CNF cement composites to measure the strain level of concrete samples, even for loads close to the material’s strength. Some problems were detected in the strain transmission between sensor and concrete specimens, which will require specific calibration of each sensor one attached to the structure.
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spelling pubmed-57469032018-01-03 Carbon Nanofiber Cement Sensors to Detect Strain and Damage of Concrete Specimens Under Compression Galao, Oscar Baeza, F. Javier Zornoza, Emilio Garcés, Pedro Nanomaterials (Basel) Article Cement composites with nano-additions have been vastly studied for their functional applications, such as strain and damage sensing. The capacity of a carbon nanofiber (CNF) cement paste has already been tested. However, this study is focused on the use of CNF cement composites as sensors in regular concrete samples. Different measuring techniques and humidity conditions of CNF samples were tested to optimize the strain and damage sensing of this material. In the strain sensing tests (for compressive stresses up to 10 MPa), the response depends on the maximum stress applied. The material was more sensitive at higher loads. Furthermore, the actual load time history did not influence the electrical response, and similar curves were obtained for different test configurations. On the other hand, damage sensing tests proved the capability of CNF cement composites to measure the strain level of concrete samples, even for loads close to the material’s strength. Some problems were detected in the strain transmission between sensor and concrete specimens, which will require specific calibration of each sensor one attached to the structure. MDPI 2017-11-24 /pmc/articles/PMC5746903/ /pubmed/29186797 http://dx.doi.org/10.3390/nano7120413 Text en © 2017 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Galao, Oscar
Baeza, F. Javier
Zornoza, Emilio
Garcés, Pedro
Carbon Nanofiber Cement Sensors to Detect Strain and Damage of Concrete Specimens Under Compression
title Carbon Nanofiber Cement Sensors to Detect Strain and Damage of Concrete Specimens Under Compression
title_full Carbon Nanofiber Cement Sensors to Detect Strain and Damage of Concrete Specimens Under Compression
title_fullStr Carbon Nanofiber Cement Sensors to Detect Strain and Damage of Concrete Specimens Under Compression
title_full_unstemmed Carbon Nanofiber Cement Sensors to Detect Strain and Damage of Concrete Specimens Under Compression
title_short Carbon Nanofiber Cement Sensors to Detect Strain and Damage of Concrete Specimens Under Compression
title_sort carbon nanofiber cement sensors to detect strain and damage of concrete specimens under compression
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5746903/
https://www.ncbi.nlm.nih.gov/pubmed/29186797
http://dx.doi.org/10.3390/nano7120413
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