{"id":547,"date":"2020-12-28T10:51:00","date_gmt":"2020-12-28T10:51:00","guid":{"rendered":"https:\/\/site.ibracon.org.br\/Site_revista\/Concreto_Construcoes\/Concreto_blog\/?p=547"},"modified":"2025-07-31T02:06:55","modified_gmt":"2025-07-31T02:06:55","slug":"palestrasanchez","status":"publish","type":"post","link":"https:\/\/site.ibracon.org.br\/Site_revista\/Concreto_Construcoes\/Concreto_blog\/destaques\/palestrasanchez\/","title":{"rendered":"Pesquisador brasileiro tratou das rea\u00e7\u00f5es expansivas no concreto"},"content":{"rendered":"\n

As estruturas de concreto podem, sob certas condi\u00e7\u00f5es, sofrer deteriora\u00e7\u00e3o com rea\u00e7\u00f5es expansivas entre os componentes em seu interior. A rea\u00e7\u00e3o \u00e1lcali-agregado (RAA) <\/strong>foi detectada h\u00e1 mais de 70 anos, sendo uma rea\u00e7\u00e3o qu\u00edmica entre as s\u00edlicas reativas dos agregados e os \u00e1lcalis do cimento, sol\u00faveis nos poros do concreto. A rea\u00e7\u00e3o forma um gel, que, na presen\u00e7a de \u00e1gua, expande-se, provocando tens\u00f5es internas nas pe\u00e7as de concreto, ocasionando sua fissura\u00e7\u00e3o.<\/p>\n\n\n\n

J\u00e1, a etringita tardia ou secund\u00e1ria (DEF<\/strong>, do ingl\u00eas Delay Etringgite Formation<\/em>) veio a ser conhecida apenas na d\u00e9cada de 1980. A etringita prim\u00e1ria \u00e9 um dos primeiros produtos decorrentes da hidrata\u00e7\u00e3o do cimento, ou seja, a rea\u00e7\u00e3o qu\u00edmica entre o cimento e a \u00e1gua que leva ao endurecimento do concreto, sendo, portanto, normal no concreto fresco e sem causar problemas futuros. Por\u00e9m, quando a temperatura do concreto nas primeiras idades supera valores da ordem de 60 a 70 graus Celsius, pode haver uma desestabiliza\u00e7\u00e3o desse produto e ocorrer o desencadeamento de uma nova rea\u00e7\u00e3o expansiva, agora muito delet\u00e9ria porque o concreto j\u00e1 est\u00e1 endurecido e vai fissurar.<\/p>\n\n\n\n

Os cientistas t\u00eam estudado os fen\u00f4menos de rea\u00e7\u00f5es expansivas no concreto e lan\u00e7ado m\u00e3o de estrat\u00e9gias te\u00f3ricas e pr\u00e1ticas para estimar as origens, a extens\u00e3o e a evolu\u00e7\u00e3o da deteriora\u00e7\u00e3o de pe\u00e7as de concreto afetadas pela RAA e DEF. Com isso, esperam encontrar solu\u00e7\u00f5es de engenharia para minimizar a expans\u00e3o dessas rea\u00e7\u00f5es e estender a durabilidade das estruturas de concreto.<\/p>\n\n\n\n

Leandro Sanchez<\/strong>, professor da Universidade de Ottawa, no Canad\u00e1, palestrou aos inscritos no 62\u00ba Congresso Brasileiro do Concreto<\/a><\/strong>, evento t\u00e9cnico-cient\u00edfico do Instituto Brasileiro do Concreto (IBRACON)<\/strong>, sobre as investiga\u00e7\u00f5es que vem desenvolvendo com sua equipe em termos de ensaios de laborat\u00f3rio para diagn\u00f3stico das rea\u00e7\u00f5es expansivas no concreto e de modelos matem\u00e1ticos para previs\u00e3o da evolu\u00e7\u00e3o dessa expans\u00e3o no tempo.<\/p>\n\n\n\n

Saiba mais, lendo a cobertura da palestra na edi\u00e7\u00e3o 99<\/a> da CONCRETO & Constru\u00e7\u00f5es<\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"

Palestra do pesquisador Leandro Sanchez apresentou seu trabalho na Universidade de Ottawa sobre RAA e DEF<\/p>\n","protected":false},"author":2,"featured_media":548,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[3],"tags":[62,63,67,29,66,61,65,64],"class_list":["post-547","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-destaques","tag-def","tag-deterioracao-do-concreto","tag-durabilidade-do-concreto","tag-estruturas-de-concreto","tag-etringita-tardia","tag-raa","tag-reacao-alcali-agregado","tag-reacoes-expansivas-no-concreto"],"acf":[],"yoast_head":"\nPesquisador brasileiro tratou das rea\u00e7\u00f5es expansivas no concreto - Blog CONCRETO & Constru\u00e7\u00f5es<\/title>\n<meta name=\"description\" content=\"O professor da Universidade de Ottawa falou de ensaios de laborat\u00f3rio para diagn\u00f3stico das rea\u00e7\u00f5es 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