Soil stabilisation using alkaline activation of fly ash for self-compacting rammed earth construction

Detalhes bibliográficos
Autor(a) principal: Cristelo, Nuno
Data de Publicação: 2012
Outros Autores: Glendinning, Stephanie, Miranda, Tiago F. S., Oliveira, Daniel V., Silva, Rui André Martins
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
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