Microscopic observations of sites and forms of ettringite in the microstructure of deteriorated concrete
The determination of delayed ettringite formation (DEF) in hardened concrete relying simply on the identification of ettringite by electron microscopy or powder X-ray diffractometry can be imperfect because of the high risk of missing other possible deterioration phenomena. The presence of ettringi...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Consejo Superior de Investigaciones Científicas
2022-04-01
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| Series: | Materiales de Construccion |
| Subjects: | |
| Online Access: | https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/2921 |
| _version_ | 1828811594481532928 |
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| author | Y. Ando H. Shinichi T. Katayama K. Torii |
| author_facet | Y. Ando H. Shinichi T. Katayama K. Torii |
| author_sort | Y. Ando |
| collection | DOAJ |
| description |
The determination of delayed ettringite formation (DEF) in hardened concrete relying simply on the identification of ettringite by electron microscopy or powder X-ray diffractometry can be imperfect because of the high risk of missing other possible deterioration phenomena. The presence of ettringite can be easily biased as an indication of DEF while the actual cause of deterioration is ASR. This paper identifies the deterioration causes and presents different ettringite formation factors based on the petrological observation results. The experiments conditions including depth of carbonation, mix proportions of concrete, curing temperature and others were considered. The deterioration of the samples seem to be correlated to ASR, except for the precast concrete product which presented DEF. In order to determine the deterioration causes and demonstrate the importance of petrological approach, different observations using the same methods were carried out on a concrete specimen blended with fly ash showing some cracks.
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| first_indexed | 2024-12-12T09:30:22Z |
| format | Article |
| id | doaj.art-b9707593635c41b8b55c9af2dcfeb382 |
| institution | Directory Open Access Journal |
| issn | 0465-2746 1988-3226 |
| language | English |
| last_indexed | 2024-12-12T09:30:22Z |
| publishDate | 2022-04-01 |
| publisher | Consejo Superior de Investigaciones Científicas |
| record_format | Article |
| series | Materiales de Construccion |
| spelling | doaj.art-b9707593635c41b8b55c9af2dcfeb3822022-12-22T00:28:53ZengConsejo Superior de Investigaciones CientíficasMateriales de Construccion0465-27461988-32262022-04-017234610.3989/mc.2022.15521Microscopic observations of sites and forms of ettringite in the microstructure of deteriorated concreteY. Ando0H. Shinichi1T. Katayama2K. Torii3Taiheiyo Consultant Co. Ltd.Taiheiyo Consultant Co. Ltd.Katayama Petrographic Consulting OfficeKanazawa Branch, Central Nippon Highway Engineering Nagoya Ltd. The determination of delayed ettringite formation (DEF) in hardened concrete relying simply on the identification of ettringite by electron microscopy or powder X-ray diffractometry can be imperfect because of the high risk of missing other possible deterioration phenomena. The presence of ettringite can be easily biased as an indication of DEF while the actual cause of deterioration is ASR. This paper identifies the deterioration causes and presents different ettringite formation factors based on the petrological observation results. The experiments conditions including depth of carbonation, mix proportions of concrete, curing temperature and others were considered. The deterioration of the samples seem to be correlated to ASR, except for the precast concrete product which presented DEF. In order to determine the deterioration causes and demonstrate the importance of petrological approach, different observations using the same methods were carried out on a concrete specimen blended with fly ash showing some cracks. https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/2921Alkali-silica reactionDelay-ettringite formation (DEF)Scanning electron microscopy (SEM)EttringitePetrography |
| spellingShingle | Y. Ando H. Shinichi T. Katayama K. Torii Microscopic observations of sites and forms of ettringite in the microstructure of deteriorated concrete Materiales de Construccion Alkali-silica reaction Delay-ettringite formation (DEF) Scanning electron microscopy (SEM) Ettringite Petrography |
| title | Microscopic observations of sites and forms of ettringite in the microstructure of deteriorated concrete |
| title_full | Microscopic observations of sites and forms of ettringite in the microstructure of deteriorated concrete |
| title_fullStr | Microscopic observations of sites and forms of ettringite in the microstructure of deteriorated concrete |
| title_full_unstemmed | Microscopic observations of sites and forms of ettringite in the microstructure of deteriorated concrete |
| title_short | Microscopic observations of sites and forms of ettringite in the microstructure of deteriorated concrete |
| title_sort | microscopic observations of sites and forms of ettringite in the microstructure of deteriorated concrete |
| topic | Alkali-silica reaction Delay-ettringite formation (DEF) Scanning electron microscopy (SEM) Ettringite Petrography |
| url | https://materconstrucc.revistas.csic.es/index.php/materconstrucc/article/view/2921 |
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