{"id":614,"date":"2021-09-02T20:33:00","date_gmt":"2021-09-02T20:33:00","guid":{"rendered":"https:\/\/site.ibracon.org.br\/Site_revista\/Concreto_Construcoes\/Concreto_blog\/?p=614"},"modified":"2025-07-31T02:06:07","modified_gmt":"2025-07-31T02:06:07","slug":"analise-multinivel","status":"publish","type":"post","link":"https:\/\/site.ibracon.org.br\/Site_revista\/Concreto_Construcoes\/Concreto_blog\/press-releases\/analise-multinivel\/","title":{"rendered":"An\u00e1lise multin\u00edvel de viaduto respaldou sua demoli\u00e7\u00e3o"},"content":{"rendered":"\n

As estruturas de concreto das obras de engenharia podem sofrer deteriora\u00e7\u00e3o ao longo do tempo devido a diferentes fatores qu\u00edmicos<\/a>, f\u00edsico-mec\u00e2nicos, eletroqu\u00edmicos e biol\u00f3gicos, que podem atuar isolada ou conjuntamente no concreto.<\/p>\n\n\n\n

Esses fatores podem causar ao longo do tempo de uso da obra a deteriora\u00e7\u00e3o das pe\u00e7as<\/strong>, componentes e estrutura de concreto, isto \u00e9, a redu\u00e7\u00e3o de sua integridade f\u00edsica, de sua rigidez e de seu desempenho mec\u00e2nico, comprometendo a seguran\u00e7a, funcionalidade e durabilidade da obra.<\/p>\n\n\n\n

Com estruturas de concreto atingindo, em n\u00edvel mundial, sua vida \u00fatil m\u00ednima de 50 anos, torna-se imprescind\u00edvel inspecion\u00e1-las para se certificar se sofrem ou n\u00e3o deteriora\u00e7\u00e3o precoce e, caso sofram, \u00e9 necess\u00e1rio realizar procedimentos de ensaios para avali\u00e1-las quanto ao mecanismo, grau e velocidade dessa deteriora\u00e7\u00e3o (an\u00e1lise multin\u00edvel). Com isso, \u00e9 poss\u00edvel atestar se uma determinada obra em uso j\u00e1 por v\u00e1rias d\u00e9cadas pode continuar prestando seus servi\u00e7os com seguran\u00e7a, ou se precisa sofrer interven\u00e7\u00f5es corretivas para continuar em uso, ou ainda se necessita ser demolida e dar lugar a uma obra nova.<\/p>\n\n\n\n

Este assunto foi ilustrado por um estudo de caso de avalia\u00e7\u00e3o multin\u00edvel de um viaduto afetado por rea\u00e7\u00f5es expansivas na cidade canadense de Quebec<\/strong>, com mais de 50 anos, pelo pesquisador brasileiro Dr. Leandro Sanchez<\/a>, professor da Universidade de Ottawa, em sua palestra magna no 62CBC2020.<\/p>\n\n\n\n

\"Prof.
Prof. Leandro Sanchez (\u00e0 esq.)\u00e9 apresentado aos congressistas do 62\u00ba Congresso Brasileiro do Concreto pelo presidente do IBRACON, Prof. Paulo Helene<\/figcaption><\/figure>\n\n\n\n

An\u00e1lise multin\u00edvel<\/strong><\/h2>\n\n\n\n

O viaduto Robert-Bourassa Charest era composto por tabuleiro, pilares em Y e blocos de funda\u00e7\u00e3o<\/strong>, sendo este com 24 MPa e aqueles com 28 MPa. Antes que fosse demolido por estar completamente deteriorado, foram retirados testemunhos do tabuleiro, dos pilares e dos blocos de funda\u00e7\u00e3o para avalia\u00e7\u00e3o do estado geral da estrutura ap\u00f3s 50 anos.<\/p>\n\n\n\n

\"Primeiro
Extra\u00e7\u00e3o dos testemunhos de concreto dos componentes do viaduto<\/figcaption><\/figure>\n\n\n\n

Alguns desses testemunhos foram submetidos ao ensaio de compress\u00e3o modificado (\u201cStiffness Damage Test\u201d \u2013 SDT<\/strong>), que consiste em executar cinco ciclos de compress\u00e3o, com uma carga 40% da carga total de ruptura do testemunho extra\u00eddo, para fazer suas fissuras fecharem e plastificarem. O ensaio gera uma curva tens\u00e3o x deforma\u00e7\u00e3o, gerando \u00edndices relativos \u00e0 expans\u00e3o da deteriora\u00e7\u00e3o na pe\u00e7a\/estrutura. Os resultados indicaram expans\u00e3o muito elevada nos blocos de funda\u00e7\u00e3o, elevada no tabuleiro e moderada nos pilares.<\/p>\n\n\n\n

\"Resultados
Gr\u00e1fico com os resultados SDT apresentado pelo Prof. Leandro Sanchez<\/figcaption><\/figure>\n\n\n\n

J\u00e1, o ensaio microsc\u00f3pio dos testemunhos consistiu, primeiramente, em localizar, caracterizar, quantificar e medir, por meio de uma lupa binocular com aumento de 16 vezes, as fissuras por cent\u00edmetro quadrado nos testemunhos avaliados. Secundariamente, esses \u00edndices preliminares foram multiplicados por fatores de pondera\u00e7\u00e3o relacionados ao local e caracter\u00edsticas dessas fissuras. Com isso, chegou-se, por fim, aos \u00edndices gerais de deteriora\u00e7\u00e3o das pe\u00e7as (DRI)<\/strong>.<\/p>\n\n\n\n

\"Resultados
Compara\u00e7\u00e3o dos resultados dos ensaios microsc\u00f3picos<\/figcaption><\/figure>\n\n\n\n

Os resultados DRI mostraram grande propor\u00e7\u00e3o de fissuras nos agregados preenchidas por gel, indicando a presen\u00e7a da rea\u00e7\u00e3o \u00e1lcali-s\u00edlica<\/a> (RAS)<\/strong>, bem como fissuras na pasta de cimento, o que pode ser indicativo de RAS em est\u00e1gio bem avan\u00e7ado ou de gelo-degelo como mecanismo secund\u00e1rio de deteriora\u00e7\u00e3o.<\/p>\n\n\n\n

\"Resultados
Resultados da an\u00e1lise multin\u00edvel do viaduto<\/figcaption><\/figure>\n\n\n\n

Saiba mais, lendo o artigo \u201cDiagn\u00f3stico de rea\u00e7\u00e3o \u00e1lcali-agregado implicou demoli\u00e7\u00e3o de viaduto no Canad\u00e1\u201d<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Conhe\u00e7a os ensaios microsc\u00f3picos e mec\u00e2nicos que integraram a inspe\u00e7\u00e3o do viaduto e que possibilitaram o diagn\u00f3stico de RAA<\/p>\n","protected":false},"author":2,"featured_media":621,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4],"tags":[108,63,79,80],"class_list":["post-614","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-press-releases","tag-analise-multinivel","tag-deterioracao-do-concreto","tag-inspecao-de-obras","tag-manutencao-de-obras"],"acf":[],"yoast_head":"\nAn\u00e1lise multin\u00edvel de viaduto respaldou sua demoli\u00e7\u00e3o - Blog CONCRETO & Constru\u00e7\u00f5es<\/title>\n<meta name=\"description\" content=\"Palestra exp\u00f5e as an\u00e1lises microsc\u00f3picas e mec\u00e2nicas dos componentes de um viaduto no Canad\u00e1 que possibilitaram o diagn\u00f3stico da RAA\" \/>\n<meta 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