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The Influence of Curing Regimes in Self-Healing of Nano-Modified Cement Pastes

The present study proposes nano-calcium oxide (NC) and nano-silica (NS) particles as healing agents in cement pastes, taking into account the curing conditions. Two series of specimens were treated in water and under wetting-drying cycles. The addition of NC (1.5%wt of binder) triggered early healin...

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Autores principales: Stefanidou, Maria, Tsardaka, Eirini-Chrysanthi, Karozou, Aspasia
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7700502/
https://www.ncbi.nlm.nih.gov/pubmed/33238635
http://dx.doi.org/10.3390/ma13225301
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author Stefanidou, Maria
Tsardaka, Eirini-Chrysanthi
Karozou, Aspasia
author_facet Stefanidou, Maria
Tsardaka, Eirini-Chrysanthi
Karozou, Aspasia
author_sort Stefanidou, Maria
collection PubMed
description The present study proposes nano-calcium oxide (NC) and nano-silica (NS) particles as healing agents in cement pastes, taking into account the curing conditions. Two series of specimens were treated in water and under wetting-drying cycles. The addition of NC (1.5%wt of binder) triggered early healing since cracks were healed within 14 days in underwater immersion and before 28 days at wetting-drying cycles. Attenuated Total Reflectance (ATR) spectroscopy and SEM analysis revealed that the healing products were mainly aragonite and calcite in water conditions and more amorphous carbonates under wetting-drying cycles. The combination of NS and NC (3.0%wt in total) offered healing under both curing conditions before 28 days. The presence of NS assisted toward porosity refinement and NC increased the carbonates’ content. The newly formed material was dense, and its elemental analysis by SEM revealed the C-S-H compounds that were also verified by ATR.
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spelling pubmed-77005022020-11-30 The Influence of Curing Regimes in Self-Healing of Nano-Modified Cement Pastes Stefanidou, Maria Tsardaka, Eirini-Chrysanthi Karozou, Aspasia Materials (Basel) Article The present study proposes nano-calcium oxide (NC) and nano-silica (NS) particles as healing agents in cement pastes, taking into account the curing conditions. Two series of specimens were treated in water and under wetting-drying cycles. The addition of NC (1.5%wt of binder) triggered early healing since cracks were healed within 14 days in underwater immersion and before 28 days at wetting-drying cycles. Attenuated Total Reflectance (ATR) spectroscopy and SEM analysis revealed that the healing products were mainly aragonite and calcite in water conditions and more amorphous carbonates under wetting-drying cycles. The combination of NS and NC (3.0%wt in total) offered healing under both curing conditions before 28 days. The presence of NS assisted toward porosity refinement and NC increased the carbonates’ content. The newly formed material was dense, and its elemental analysis by SEM revealed the C-S-H compounds that were also verified by ATR. MDPI 2020-11-23 /pmc/articles/PMC7700502/ /pubmed/33238635 http://dx.doi.org/10.3390/ma13225301 Text en © 2020 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
Stefanidou, Maria
Tsardaka, Eirini-Chrysanthi
Karozou, Aspasia
The Influence of Curing Regimes in Self-Healing of Nano-Modified Cement Pastes
title The Influence of Curing Regimes in Self-Healing of Nano-Modified Cement Pastes
title_full The Influence of Curing Regimes in Self-Healing of Nano-Modified Cement Pastes
title_fullStr The Influence of Curing Regimes in Self-Healing of Nano-Modified Cement Pastes
title_full_unstemmed The Influence of Curing Regimes in Self-Healing of Nano-Modified Cement Pastes
title_short The Influence of Curing Regimes in Self-Healing of Nano-Modified Cement Pastes
title_sort influence of curing regimes in self-healing of nano-modified cement pastes
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7700502/
https://www.ncbi.nlm.nih.gov/pubmed/33238635
http://dx.doi.org/10.3390/ma13225301
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