Assessment of the potential alkali-reactivity of volcanic aggregates from Azores islands
Volcanic rocks have been found to be potentially alkali-reactive in a number of countries, including Japan, Iceland and Turkey. To characterize the potential reactivity of the volcanic rocks used as aggregates for concrete in the Azores islands, an experimental program is being carried out which inc...
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ftlnec:oai:localhost:123456789/1003565 2023-05-15T16:51:02+02:00 Assessment of the potential alkali-reactivity of volcanic aggregates from Azores islands Medeiros, S. Katayama, T. Zanon, V. Fernandes, I. Santos Silva, A. Nunes, J. C. Miranda, V. Ramos, V. Soares, D. 2012-05 http://repositorio.lnec.pt:8080/jspui/handle/123456789/1003565 eng eng Proceedings of the 14th International Conference on Alkali Aggregate Reaction http://repositorio.lnec.pt:8080/jspui/handle/123456789/1003565 Austin 14th International Conference on Alkali-Aggregate Reaction Austin, Texas, USA 0204/14/17905 0202/11/17679 openAccess Azores islands Volcanic aggregates Petrography Geochemistry Asr conferenceObject 2012 ftlnec 2022-02-21T12:33:28Z Volcanic rocks have been found to be potentially alkali-reactive in a number of countries, including Japan, Iceland and Turkey. To characterize the potential reactivity of the volcanic rocks used as aggregates for concrete in the Azores islands, an experimental program is being carried out which includes petrographic examination, chemical analysis and lab accelerated tests. The geochemical composition of the rocks of the Azores islands varies considerably. The rocks used as aggregates are mainly silica-undersaturated basalts and trachytes. The petrographic examination and the chemical analyses of the rocks confirmed that one of the five analysed samples contains free silica and another sample presents volcanic glass. The occurrence of microcrystalline quartz as a secondary product filling the interstices of the trachyte was confirmed by SEM/EDS. This paper presents the preliminary results obtained on the characterization of the first five samples of volcanic rocks from Azores regarding the potential reactivity to alkalis using different methods. The analyses by SEM/EDS were performed at CEMUP which equipment was funded by the projects REEQ/1062/CTM/2005 and REDE/1512/RME/2005 of Portuguese Foundation for Science and Technology (FCT). The authors also acknowledge the financial support of the FCT under the projects PTDC/CTM/65243/2006 and PDTC/ECM/115486/2009. 4 3 10p DM/NMM 2012 20 a 25 de maio Conference Object Iceland Repositório Cientifico do LNEC (Laboratório Nacional de Engenharia Civil) |
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Open Polar |
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Repositório Cientifico do LNEC (Laboratório Nacional de Engenharia Civil) |
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ftlnec |
language |
English |
topic |
Azores islands Volcanic aggregates Petrography Geochemistry Asr |
spellingShingle |
Azores islands Volcanic aggregates Petrography Geochemistry Asr Medeiros, S. Katayama, T. Zanon, V. Fernandes, I. Santos Silva, A. Nunes, J. C. Miranda, V. Ramos, V. Soares, D. Assessment of the potential alkali-reactivity of volcanic aggregates from Azores islands |
topic_facet |
Azores islands Volcanic aggregates Petrography Geochemistry Asr |
description |
Volcanic rocks have been found to be potentially alkali-reactive in a number of countries, including Japan, Iceland and Turkey. To characterize the potential reactivity of the volcanic rocks used as aggregates for concrete in the Azores islands, an experimental program is being carried out which includes petrographic examination, chemical analysis and lab accelerated tests. The geochemical composition of the rocks of the Azores islands varies considerably. The rocks used as aggregates are mainly silica-undersaturated basalts and trachytes. The petrographic examination and the chemical analyses of the rocks confirmed that one of the five analysed samples contains free silica and another sample presents volcanic glass. The occurrence of microcrystalline quartz as a secondary product filling the interstices of the trachyte was confirmed by SEM/EDS. This paper presents the preliminary results obtained on the characterization of the first five samples of volcanic rocks from Azores regarding the potential reactivity to alkalis using different methods. The analyses by SEM/EDS were performed at CEMUP which equipment was funded by the projects REEQ/1062/CTM/2005 and REDE/1512/RME/2005 of Portuguese Foundation for Science and Technology (FCT). The authors also acknowledge the financial support of the FCT under the projects PTDC/CTM/65243/2006 and PDTC/ECM/115486/2009. 4 3 10p DM/NMM 2012 20 a 25 de maio |
format |
Conference Object |
author |
Medeiros, S. Katayama, T. Zanon, V. Fernandes, I. Santos Silva, A. Nunes, J. C. Miranda, V. Ramos, V. Soares, D. |
author_facet |
Medeiros, S. Katayama, T. Zanon, V. Fernandes, I. Santos Silva, A. Nunes, J. C. Miranda, V. Ramos, V. Soares, D. |
author_sort |
Medeiros, S. |
title |
Assessment of the potential alkali-reactivity of volcanic aggregates from Azores islands |
title_short |
Assessment of the potential alkali-reactivity of volcanic aggregates from Azores islands |
title_full |
Assessment of the potential alkali-reactivity of volcanic aggregates from Azores islands |
title_fullStr |
Assessment of the potential alkali-reactivity of volcanic aggregates from Azores islands |
title_full_unstemmed |
Assessment of the potential alkali-reactivity of volcanic aggregates from Azores islands |
title_sort |
assessment of the potential alkali-reactivity of volcanic aggregates from azores islands |
publishDate |
2012 |
url |
http://repositorio.lnec.pt:8080/jspui/handle/123456789/1003565 |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
Proceedings of the 14th International Conference on Alkali Aggregate Reaction http://repositorio.lnec.pt:8080/jspui/handle/123456789/1003565 Austin 14th International Conference on Alkali-Aggregate Reaction Austin, Texas, USA 0204/14/17905 0202/11/17679 |
op_rights |
openAccess |
_version_ |
1766041152528580608 |