Cargando…

Study of the Microstructure Evolution of Low-pH Cements Based on Ordinary Portland Cement (OPC) by Mid- and Near-Infrared Spectroscopy, and Their Influence on Corrosion of Steel Reinforcement

Low-pH cements are designed to be used in underground repositories for high level waste. When they are based on Ordinary Portland Cements (OPC), high mineral admixture contents must be used which significantly modify their microstructure properties and performance. This paper evaluates the microstru...

Descripción completa

Detalles Bibliográficos
Autores principales: García Calvo, José Luis, Sánchez Moreno, Mercedes, Alonso Alonso, María Cruz, Hidalgo López, Ana, García Olmo, Juan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2013
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5458935/
https://www.ncbi.nlm.nih.gov/pubmed/28809287
http://dx.doi.org/10.3390/ma6062508
_version_ 1783241859691184128
author García Calvo, José Luis
Sánchez Moreno, Mercedes
Alonso Alonso, María Cruz
Hidalgo López, Ana
García Olmo, Juan
author_facet García Calvo, José Luis
Sánchez Moreno, Mercedes
Alonso Alonso, María Cruz
Hidalgo López, Ana
García Olmo, Juan
author_sort García Calvo, José Luis
collection PubMed
description Low-pH cements are designed to be used in underground repositories for high level waste. When they are based on Ordinary Portland Cements (OPC), high mineral admixture contents must be used which significantly modify their microstructure properties and performance. This paper evaluates the microstructure evolution of low-pH cement pastes based on OPC plus silica fume and/or fly ashes, using Mid-Infrared and Near-Infrared spectroscopy to detect cement pastes mainly composed of high polymerized C-A-S-H gels with low C/S ratios. In addition, the lower pore solution pH of these special cementitious materials have been monitored with embedded metallic sensors. Besides, as the use of reinforced concrete can be required in underground repositories, the influence of low-pH cementitious materials on steel reinforcement corrosion was analysed. Due to their lower pore solution pH and their different pore solution chemical composition a clear influence on steel reinforcement corrosion was detected.
format Online
Article
Text
id pubmed-5458935
institution National Center for Biotechnology Information
language English
publishDate 2013
publisher MDPI
record_format MEDLINE/PubMed
spelling pubmed-54589352017-07-28 Study of the Microstructure Evolution of Low-pH Cements Based on Ordinary Portland Cement (OPC) by Mid- and Near-Infrared Spectroscopy, and Their Influence on Corrosion of Steel Reinforcement García Calvo, José Luis Sánchez Moreno, Mercedes Alonso Alonso, María Cruz Hidalgo López, Ana García Olmo, Juan Materials (Basel) Article Low-pH cements are designed to be used in underground repositories for high level waste. When they are based on Ordinary Portland Cements (OPC), high mineral admixture contents must be used which significantly modify their microstructure properties and performance. This paper evaluates the microstructure evolution of low-pH cement pastes based on OPC plus silica fume and/or fly ashes, using Mid-Infrared and Near-Infrared spectroscopy to detect cement pastes mainly composed of high polymerized C-A-S-H gels with low C/S ratios. In addition, the lower pore solution pH of these special cementitious materials have been monitored with embedded metallic sensors. Besides, as the use of reinforced concrete can be required in underground repositories, the influence of low-pH cementitious materials on steel reinforcement corrosion was analysed. Due to their lower pore solution pH and their different pore solution chemical composition a clear influence on steel reinforcement corrosion was detected. MDPI 2013-06-18 /pmc/articles/PMC5458935/ /pubmed/28809287 http://dx.doi.org/10.3390/ma6062508 Text en © 2013 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 license (http://creativecommons.org/licenses/by/3.0/).
spellingShingle Article
García Calvo, José Luis
Sánchez Moreno, Mercedes
Alonso Alonso, María Cruz
Hidalgo López, Ana
García Olmo, Juan
Study of the Microstructure Evolution of Low-pH Cements Based on Ordinary Portland Cement (OPC) by Mid- and Near-Infrared Spectroscopy, and Their Influence on Corrosion of Steel Reinforcement
title Study of the Microstructure Evolution of Low-pH Cements Based on Ordinary Portland Cement (OPC) by Mid- and Near-Infrared Spectroscopy, and Their Influence on Corrosion of Steel Reinforcement
title_full Study of the Microstructure Evolution of Low-pH Cements Based on Ordinary Portland Cement (OPC) by Mid- and Near-Infrared Spectroscopy, and Their Influence on Corrosion of Steel Reinforcement
title_fullStr Study of the Microstructure Evolution of Low-pH Cements Based on Ordinary Portland Cement (OPC) by Mid- and Near-Infrared Spectroscopy, and Their Influence on Corrosion of Steel Reinforcement
title_full_unstemmed Study of the Microstructure Evolution of Low-pH Cements Based on Ordinary Portland Cement (OPC) by Mid- and Near-Infrared Spectroscopy, and Their Influence on Corrosion of Steel Reinforcement
title_short Study of the Microstructure Evolution of Low-pH Cements Based on Ordinary Portland Cement (OPC) by Mid- and Near-Infrared Spectroscopy, and Their Influence on Corrosion of Steel Reinforcement
title_sort study of the microstructure evolution of low-ph cements based on ordinary portland cement (opc) by mid- and near-infrared spectroscopy, and their influence on corrosion of steel reinforcement
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5458935/
https://www.ncbi.nlm.nih.gov/pubmed/28809287
http://dx.doi.org/10.3390/ma6062508
work_keys_str_mv AT garciacalvojoseluis studyofthemicrostructureevolutionoflowphcementsbasedonordinaryportlandcementopcbymidandnearinfraredspectroscopyandtheirinfluenceoncorrosionofsteelreinforcement
AT sanchezmorenomercedes studyofthemicrostructureevolutionoflowphcementsbasedonordinaryportlandcementopcbymidandnearinfraredspectroscopyandtheirinfluenceoncorrosionofsteelreinforcement
AT alonsoalonsomariacruz studyofthemicrostructureevolutionoflowphcementsbasedonordinaryportlandcementopcbymidandnearinfraredspectroscopyandtheirinfluenceoncorrosionofsteelreinforcement
AT hidalgolopezana studyofthemicrostructureevolutionoflowphcementsbasedonordinaryportlandcementopcbymidandnearinfraredspectroscopyandtheirinfluenceoncorrosionofsteelreinforcement
AT garciaolmojuan studyofthemicrostructureevolutionoflowphcementsbasedonordinaryportlandcementopcbymidandnearinfraredspectroscopyandtheirinfluenceoncorrosionofsteelreinforcement