Soil stabilisation using alkaline activation of fly ash for self-compacting rammed earth construction
Autor(a) principal: | |
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Data de Publicação: | 2012 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/1822/21819 |
Resumo: | This paper studies the effectiveness of alkaline activation of low-calcium fly ash on the improvement of residual granitic soils to be used on rammed-earth construction. Different liquid:solid ratios, alkali concentrations and Na2O : ash ratios were tested. Effect of calcium hidroxide, sodium chloride and concrete superplasticiser is also reported. Compressive strength up to 7 days at 60ºC was determined. Results show that, in terms of mechanical strength, there is an optimum value for the activator:solids ratio and the alkali concentration, and that a decrease in the Na2O:ash ratio results in strength increase. No improvement was observed with the sodium chloride or the superplasticiser, while the calcium produced only a short term increase in strength. SEM/EDS analysis were used to analyse microstructural development, showing that strength is fairly related to the Si:Al and Na:Si ratios. |
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spelling |
Soil stabilisation using alkaline activation of fly ash for self-compacting rammed earth constructionSoil stabilisationAlkaline activationFly ashRammed earthScience & TechnologyThis paper studies the effectiveness of alkaline activation of low-calcium fly ash on the improvement of residual granitic soils to be used on rammed-earth construction. Different liquid:solid ratios, alkali concentrations and Na2O : ash ratios were tested. Effect of calcium hidroxide, sodium chloride and concrete superplasticiser is also reported. Compressive strength up to 7 days at 60ºC was determined. Results show that, in terms of mechanical strength, there is an optimum value for the activator:solids ratio and the alkali concentration, and that a decrease in the Na2O:ash ratio results in strength increase. No improvement was observed with the sodium chloride or the superplasticiser, while the calcium produced only a short term increase in strength. SEM/EDS analysis were used to analyse microstructural development, showing that strength is fairly related to the Si:Al and Na:Si ratios.ElsevierUniversidade do MinhoCristelo, NunoGlendinning, StephanieMiranda, Tiago F. S.Oliveira, Daniel V.Silva, Rui André Martins2012-112012-11-01T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/1822/21819eng0950-061810.1016/j.conbuildmat.2012.06.037http://dx.doi.org/10.1016/j.conbuildmat.2012.06.037info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-07-21T12:01:34Zoai:repositorium.sdum.uminho.pt:1822/21819Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T18:51:28.994067Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Soil stabilisation using alkaline activation of fly ash for self-compacting rammed earth construction |
title |
Soil stabilisation using alkaline activation of fly ash for self-compacting rammed earth construction |
spellingShingle |
Soil stabilisation using alkaline activation of fly ash for self-compacting rammed earth construction Cristelo, Nuno Soil stabilisation Alkaline activation Fly ash Rammed earth Science & Technology |
title_short |
Soil stabilisation using alkaline activation of fly ash for self-compacting rammed earth construction |
title_full |
Soil stabilisation using alkaline activation of fly ash for self-compacting rammed earth construction |
title_fullStr |
Soil stabilisation using alkaline activation of fly ash for self-compacting rammed earth construction |
title_full_unstemmed |
Soil stabilisation using alkaline activation of fly ash for self-compacting rammed earth construction |
title_sort |
Soil stabilisation using alkaline activation of fly ash for self-compacting rammed earth construction |
author |
Cristelo, Nuno |
author_facet |
Cristelo, Nuno Glendinning, Stephanie Miranda, Tiago F. S. Oliveira, Daniel V. Silva, Rui André Martins |
author_role |
author |
author2 |
Glendinning, Stephanie Miranda, Tiago F. S. Oliveira, Daniel V. Silva, Rui André Martins |
author2_role |
author author author author |
dc.contributor.none.fl_str_mv |
Universidade do Minho |
dc.contributor.author.fl_str_mv |
Cristelo, Nuno Glendinning, Stephanie Miranda, Tiago F. S. Oliveira, Daniel V. Silva, Rui André Martins |
dc.subject.por.fl_str_mv |
Soil stabilisation Alkaline activation Fly ash Rammed earth Science & Technology |
topic |
Soil stabilisation Alkaline activation Fly ash Rammed earth Science & Technology |
description |
This paper studies the effectiveness of alkaline activation of low-calcium fly ash on the improvement of residual granitic soils to be used on rammed-earth construction. Different liquid:solid ratios, alkali concentrations and Na2O : ash ratios were tested. Effect of calcium hidroxide, sodium chloride and concrete superplasticiser is also reported. Compressive strength up to 7 days at 60ºC was determined. Results show that, in terms of mechanical strength, there is an optimum value for the activator:solids ratio and the alkali concentration, and that a decrease in the Na2O:ash ratio results in strength increase. No improvement was observed with the sodium chloride or the superplasticiser, while the calcium produced only a short term increase in strength. SEM/EDS analysis were used to analyse microstructural development, showing that strength is fairly related to the Si:Al and Na:Si ratios. |
publishDate |
2012 |
dc.date.none.fl_str_mv |
2012-11 2012-11-01T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/1822/21819 |
url |
http://hdl.handle.net/1822/21819 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
0950-0618 10.1016/j.conbuildmat.2012.06.037 http://dx.doi.org/10.1016/j.conbuildmat.2012.06.037 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
|
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1799132287656263680 |