Cargando…
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...
Autores principales: | , , |
---|---|
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 |
_version_ | 1783616295290273792 |
---|---|
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. |
format | Online Article Text |
id | pubmed-7700502 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
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 |
work_keys_str_mv | AT stefanidoumaria theinfluenceofcuringregimesinselfhealingofnanomodifiedcementpastes AT tsardakaeirinichrysanthi theinfluenceofcuringregimesinselfhealingofnanomodifiedcementpastes AT karozouaspasia theinfluenceofcuringregimesinselfhealingofnanomodifiedcementpastes AT stefanidoumaria influenceofcuringregimesinselfhealingofnanomodifiedcementpastes AT tsardakaeirinichrysanthi influenceofcuringregimesinselfhealingofnanomodifiedcementpastes AT karozouaspasia influenceofcuringregimesinselfhealingofnanomodifiedcementpastes |