{"id":580,"date":"2021-03-24T18:15:26","date_gmt":"2021-03-24T18:15:26","guid":{"rendered":"https:\/\/site.ibracon.org.br\/Site_revista\/Concreto_Construcoes\/Concreto_blog\/?p=580"},"modified":"2025-07-31T02:06:54","modified_gmt":"2025-07-31T02:06:54","slug":"concreto-branco","status":"publish","type":"post","link":"https:\/\/site.ibracon.org.br\/Site_revista\/Concreto_Construcoes\/Concreto_blog\/press-releases\/concreto-branco\/","title":{"rendered":"O que \u00e9 o concreto branco?"},"content":{"rendered":"\n
O concreto branco \u00e9 o concreto com colora\u00e7\u00e3o branca, garantida pelo uso de cimento branco e agregados mi\u00fados e gra\u00fados adequados. <\/p>\n\n\n\n
Ele \u00e9 indicado para obras que, al\u00e9m das caracter\u00edsticas de durabilidade e desempenho mec\u00e2nico conferidas pelos concretos convencionais de colora\u00e7\u00e3o cinza, tenham valor est\u00e9tico<\/strong>. \u00c9 tamb\u00e9m usado em pe\u00e7as pr\u00e9-fabricadas de pavimento intertravado (pavers<\/em>), usadas em pra\u00e7as, cal\u00e7adas e parques, bem como em tampos de cozinhas e banheiros.<\/p>\n\n\n\n
Composi\u00e7\u00e3o do concreto branco<\/strong><\/h2>\n\n\n\n
O cimento branco \u00e9 fabricado a partir de mat\u00e9rias-primas isentas de \u00f3xidos de ferro e mangan\u00eas, que s\u00e3o os principais compostos corantes e respons\u00e1veis pela colora\u00e7\u00e3o do cimento cinza tradicional. Sua fabrica\u00e7\u00e3o requer algumas condi\u00e7\u00f5es especiais, como o resfriamento do cl\u00ednquer (principal composto do cimento) na sa\u00edda do forno com \u00e1gua, para uma queda abrupta na temperatura, o que preserva a cor branca, e sua moagem por meio de bolas que n\u00e3o contenham cromo, caso contr\u00e1rio o cimento adquire uma cor esverdeada.<\/p>\n\n\n\nCimento branco, fabricado com mat\u00e9rias-primas isentas de \u00f3xidos de ferro e mangan\u00eas<\/figcaption><\/figure>\n\n\n\n
Os agregados gra\u00fados (britas) usados no concreto branco devem ter colora\u00e7\u00e3o clara, com prefer\u00eancia para os agregados calc\u00e1rios calc\u00edticos e dolom\u00edticos, para n\u00e3o interferirem na cor final. J\u00e1, as areias devem ter sua fra\u00e7\u00e3o fina com colora\u00e7\u00e3o branca ou amarelada, pois \u00e9 justamente esta fra\u00e7\u00e3o que mancha ou interfere na pigmenta\u00e7\u00e3o da pasta de cimento.<\/p>\n\n\n\n
Prepara\u00e7\u00e3o do concreto branco<\/strong><\/h2>\n\n\n\n
Os agregados gra\u00fados e mi\u00fados devem ser lavados. O tra\u00e7o do concreto branco, ou seja, o proporcionamento entre seus constituintes, deve ser mais rico em cimento branco para garantir a homogeneidade da cor<\/strong>, com o m\u00ednimo de 350kg de cimento por metro c\u00fabico de concreto.<\/p>\n\n\n\n
\u00c9 recomendado o uso de aditivos superplastificantes<\/strong>, qu\u00edmicos capazes de garantir um concreto fluido e coeso quando no estado fresco. A coes\u00e3o evita a ascens\u00e3o da nata de cimento, que provoca varia\u00e7\u00f5es de tonalidade na superf\u00edcie da pe\u00e7a de concreto branco. J\u00e1, a fluidez do concreto garante o preenchimento uniforme das pe\u00e7as de concreto, evitando falhas de concretagem, que podem acarretar perdas de desempenho mec\u00e2nico e durabilidade, bem como forma\u00e7\u00e3o de bolhas de ar e de poros superficiais, que comprometeriam o acabamento est\u00e9tico da pe\u00e7a de concreto branco.<\/p>\n\n\n\n
A rela\u00e7\u00e3o \u00e1gua\/cimento do concreto branco deve ser mantida constante e buscar um equil\u00edbrio<\/strong>: quanto maior a rela\u00e7\u00e3o a\/c, mais branco ser\u00e1 o concreto; por\u00e9m, menor ser\u00e1 sua resist\u00eancia mec\u00e2nica e sua durabilidade. Assim, a rela\u00e7\u00e3o \u00e1gua\/cimento do concreto branco deve ter valores para assegurar brancura, resist\u00eancia e durabilidade, e precisa variar pouco para n\u00e3o provocar manchas nas pe\u00e7as de concreto branco.<\/p>\n\n\n\n
As armaduras devem receber pinturas do tipo ep\u00f3xi, \u00e0 base de zinco, ou galvanizadas, para prevenir sua corros\u00e3o e o consequente manchamento das pe\u00e7as de concreto branco causado por ferrugem.<\/p>\n\n\n\n
Lan\u00e7amento, desforma e cura<\/strong><\/h2>\n\n\n\n
O concreto branco deve ser lan\u00e7ado sob temperaturas abaixo de 30\u00b0C, com aus\u00eancia de ventos e insola\u00e7\u00e3o, para se evitar a retra\u00e7\u00e3o por secagem.<\/p>\n\n\n\n
As f\u00f4rmas n\u00e3o devem permitir o vazamento de nata, que compromete o acabamento superficial da pe\u00e7a de concreto branco. O reaproveitamento das f\u00f4rmas deve ser limitado a duas vezes, para evitar retrabalhos, remendos ou a necessidade de revestimentos ou pintura.<\/p>\n\n\n\n
A desforma do concreto branco deve ser prematura, para evitar seu manchamento pelas f\u00f4rmas.<\/p>\n\n\n\n
A cura do concreto branco deve ser providenciada logo ap\u00f3s a desforma e por um certo per\u00edodo de tempo, tamb\u00e9m para evitar a fissura\u00e7\u00e3o por secagem.<\/p>\n","protected":false},"excerpt":{"rendered":"
O concreto branco toma partido das qualidades est\u00e9ticas do concreto, al\u00e9m de seu desempenho mec\u00e2nico e durabilidade. Conhe\u00e7a os cuidados de dosagem e execu\u00e7\u00e3o do concreto branco nas obras.<\/p>\n","protected":false},"author":2,"featured_media":581,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4],"tags":[92,91,94,28,93],"class_list":["post-580","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-press-releases","tag-cimento-branco","tag-concreto-branco","tag-cura-do-concreto","tag-dosagem-do-concreto","tag-lancamento-do-concreto"],"acf":[],"yoast_head":"\n
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