Evaluation of Internal and Superficial Self-Healing of Cracks in Concrete with Crystalline Admixtures

Detalhes bibliográficos
Autor(a) principal: Ziegler, Fabiana
Data de Publicação: 2020
Outros Autores: Masuero, Angela Borges, Pagnussat, Daniel Tregnago, Dal Molin, Denise Carpena Coitinho
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRGS
Texto Completo: http://hdl.handle.net/10183/224116
Resumo: Reinforced concrete structures are prone to cracking. The development of cementitious matrices with the capacity for self-healing soon after these cracks appear represents savings with inspections and repairs of the structures. Self-healing can be stimulated with the use of crystalline admixtures. Such materials easily react with water and increase the density of C-S-H (hydrated-calcium-silicate), forming insoluble deposits blocking existing pores and cracks. In this research, self-healing in concrete cracks was evaluated using three di erent crystalline admixtures, submitted to two and six wetting–drying cycles. The e ciency of self-healing was evaluated by optical microscopy and using the chloride di usion test, which allowed calculating the predicted useful life of the concretes. The results highlight two important findings: (i) in optical microscopy, crystalline admixtures were not e cient in promoting self-healing on the surface of cracks in any of the studied concretes; (ii) the passage of chlorides by di usion was lower for concretes with crystalline admixtures compared to the reference, showing better internal healing of these materials and, consequently, greater prediction of the concrete’s useful life.
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spelling Ziegler, FabianaMasuero, Angela BorgesPagnussat, Daniel TregnagoDal Molin, Denise Carpena Coitinho2021-07-17T04:43:47Z20201996-1944http://hdl.handle.net/10183/224116001119593Reinforced concrete structures are prone to cracking. The development of cementitious matrices with the capacity for self-healing soon after these cracks appear represents savings with inspections and repairs of the structures. Self-healing can be stimulated with the use of crystalline admixtures. Such materials easily react with water and increase the density of C-S-H (hydrated-calcium-silicate), forming insoluble deposits blocking existing pores and cracks. In this research, self-healing in concrete cracks was evaluated using three di erent crystalline admixtures, submitted to two and six wetting–drying cycles. The e ciency of self-healing was evaluated by optical microscopy and using the chloride di usion test, which allowed calculating the predicted useful life of the concretes. The results highlight two important findings: (i) in optical microscopy, crystalline admixtures were not e cient in promoting self-healing on the surface of cracks in any of the studied concretes; (ii) the passage of chlorides by di usion was lower for concretes with crystalline admixtures compared to the reference, showing better internal healing of these materials and, consequently, greater prediction of the concrete’s useful life.application/pdfengMaterials [recurso eletrônico]. Basel, Switzerland. Vol. 13, no. 21 (2020), 18 p.Concreto armadoCloretoSelf-healing concreteEvaluation of Internal and Superficial Self-Healing of Cracks in Concrete with Crystalline AdmixturesEstrangeiroinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFRGSinstname:Universidade Federal do Rio Grande do Sul (UFRGS)instacron:UFRGSTEXT001119593.pdf.txt001119593.pdf.txtExtracted Texttext/plain78031http://www.lume.ufrgs.br/bitstream/10183/224116/2/001119593.pdf.txt11145c29edc80101e2c3b2c62b0cb576MD52ORIGINAL001119593.pdfTexto completo (inglês)application/pdf7773738http://www.lume.ufrgs.br/bitstream/10183/224116/1/001119593.pdf89c1433719329b68d92fd20205dfe579MD5110183/2241162021-08-18 04:35:08.217317oai:www.lume.ufrgs.br:10183/224116Repositório de PublicaçõesPUBhttps://lume.ufrgs.br/oai/requestopendoar:2021-08-18T07:35:08Repositório Institucional da UFRGS - Universidade Federal do Rio Grande do Sul (UFRGS)false
dc.title.pt_BR.fl_str_mv Evaluation of Internal and Superficial Self-Healing of Cracks in Concrete with Crystalline Admixtures
title Evaluation of Internal and Superficial Self-Healing of Cracks in Concrete with Crystalline Admixtures
spellingShingle Evaluation of Internal and Superficial Self-Healing of Cracks in Concrete with Crystalline Admixtures
Ziegler, Fabiana
Concreto armado
Cloreto
Self-healing concrete
title_short Evaluation of Internal and Superficial Self-Healing of Cracks in Concrete with Crystalline Admixtures
title_full Evaluation of Internal and Superficial Self-Healing of Cracks in Concrete with Crystalline Admixtures
title_fullStr Evaluation of Internal and Superficial Self-Healing of Cracks in Concrete with Crystalline Admixtures
title_full_unstemmed Evaluation of Internal and Superficial Self-Healing of Cracks in Concrete with Crystalline Admixtures
title_sort Evaluation of Internal and Superficial Self-Healing of Cracks in Concrete with Crystalline Admixtures
author Ziegler, Fabiana
author_facet Ziegler, Fabiana
Masuero, Angela Borges
Pagnussat, Daniel Tregnago
Dal Molin, Denise Carpena Coitinho
author_role author
author2 Masuero, Angela Borges
Pagnussat, Daniel Tregnago
Dal Molin, Denise Carpena Coitinho
author2_role author
author
author
dc.contributor.author.fl_str_mv Ziegler, Fabiana
Masuero, Angela Borges
Pagnussat, Daniel Tregnago
Dal Molin, Denise Carpena Coitinho
dc.subject.por.fl_str_mv Concreto armado
Cloreto
topic Concreto armado
Cloreto
Self-healing concrete
dc.subject.eng.fl_str_mv Self-healing concrete
description Reinforced concrete structures are prone to cracking. The development of cementitious matrices with the capacity for self-healing soon after these cracks appear represents savings with inspections and repairs of the structures. Self-healing can be stimulated with the use of crystalline admixtures. Such materials easily react with water and increase the density of C-S-H (hydrated-calcium-silicate), forming insoluble deposits blocking existing pores and cracks. In this research, self-healing in concrete cracks was evaluated using three di erent crystalline admixtures, submitted to two and six wetting–drying cycles. The e ciency of self-healing was evaluated by optical microscopy and using the chloride di usion test, which allowed calculating the predicted useful life of the concretes. The results highlight two important findings: (i) in optical microscopy, crystalline admixtures were not e cient in promoting self-healing on the surface of cracks in any of the studied concretes; (ii) the passage of chlorides by di usion was lower for concretes with crystalline admixtures compared to the reference, showing better internal healing of these materials and, consequently, greater prediction of the concrete’s useful life.
publishDate 2020
dc.date.issued.fl_str_mv 2020
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dc.relation.ispartof.pt_BR.fl_str_mv Materials [recurso eletrônico]. Basel, Switzerland. Vol. 13, no. 21 (2020), 18 p.
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