{"id":860,"date":"2026-06-24T18:28:59","date_gmt":"2026-06-24T18:28:59","guid":{"rendered":"https:\/\/site.ibracon.org.br\/Site_revista\/Concreto_Construcoes\/Concreto_blog\/?p=860"},"modified":"2026-06-24T18:29:02","modified_gmt":"2026-06-24T18:29:02","slug":"ligante-rcd","status":"publish","type":"post","link":"https:\/\/site.ibracon.org.br\/Site_revista\/Concreto_Construcoes\/Concreto_blog\/press-releases\/ligante-rcd\/","title":{"rendered":"Ligantes termoativados de fra\u00e7\u00e3o fina de RCD"},"content":{"rendered":"\n<p>O Brasil gera cerca de 106 milh\u00f5es de toneladas de res\u00edduos de constru\u00e7\u00e3o e demoli\u00e7\u00e3o (RCD) por ano, sendo um ter\u00e7o deste montante beneficiado por usinas de reciclagem para produ\u00e7\u00e3o de agregados reciclados destinados \u00e0 constru\u00e7\u00e3o civil.<\/p>\n\n\n\n<p>Recentemente, pesquisas cient\u00edficas e tecnol\u00f3gicas t\u00eam avaliado se a fra\u00e7\u00e3o fina desses RCD, especialmente part\u00edculas inferiores a 0,30 mm, podem readquirir reatividade \u00e0 \u00e1gua quando calcinada. <\/p>\n\n\n\n<p>A termoativa\u00e7\u00e3o desses materiais a temperaturas entre 300\u00b0C e 600\u00b0C promove a forma\u00e7\u00e3o de fases amorfas derivadas do C-S-H e silicatos dic\u00e1lcicos cristalinos do tipo belita, compostos t\u00edpicos do cimento Portland.<\/p>\n\n\n\n<p>No contexto da economia circular e menor pegada de carbono, a ativa\u00e7\u00e3o t\u00e9rmica de RCD desponta como uma alternativa promissora para a produ\u00e7\u00e3o de ligantes de baixo carbono e adi\u00e7\u00f5es ciment\u00edcias voltadas \u00e0 pavimenta\u00e7\u00e3o e obras geot\u00e9cnicas.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pesquisa no IPT avaliou termoativa\u00e7\u00e3o de RCD<\/h2>\n\n\n\n<p>O Laborat\u00f3rio de Materiais para Produtos de Constru\u00e7\u00e3o do Instituto de Pesquisas Tecnol\u00f3gicas de S\u00e3o Paulo (IPT) conduziu um projeto de pesquisa voltado \u00e0 produ\u00e7\u00e3o de ligantes termoativados a partir da fra\u00e7\u00e3o fina de RCD para aplica\u00e7\u00e3o em pavimenta\u00e7\u00e3o, em coopera\u00e7\u00e3o com a Intercement e do Banco Nacional de Desenvolvimento Econ\u00f4mico e Social (BNDES).<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"815\" src=\"https:\/\/site.ibracon.org.br\/Site_revista\/Concreto_Construcoes\/Concreto_blog\/wp-content\/uploads\/2026\/06\/Residuo-de-concreto-1024x815.jpg\" alt=\"RCD de concretos\" class=\"wp-image-861\" srcset=\"https:\/\/site.ibracon.org.br\/Site_revista\/Concreto_Construcoes\/Concreto_blog\/wp-content\/uploads\/2026\/06\/Residuo-de-concreto-1024x815.jpg 1024w, https:\/\/site.ibracon.org.br\/Site_revista\/Concreto_Construcoes\/Concreto_blog\/wp-content\/uploads\/2026\/06\/Residuo-de-concreto-300x239.jpg 300w, https:\/\/site.ibracon.org.br\/Site_revista\/Concreto_Construcoes\/Concreto_blog\/wp-content\/uploads\/2026\/06\/Residuo-de-concreto-768x611.jpg 768w, https:\/\/site.ibracon.org.br\/Site_revista\/Concreto_Construcoes\/Concreto_blog\/wp-content\/uploads\/2026\/06\/Residuo-de-concreto-1536x1222.jpg 1536w, https:\/\/site.ibracon.org.br\/Site_revista\/Concreto_Construcoes\/Concreto_blog\/wp-content\/uploads\/2026\/06\/Residuo-de-concreto-2048x1629.jpg 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Numa primeira etapa, o projeto avaliou a melhor forma de combinar e otimizar a reatividade de materiais de RCD provenientes de concreteiras, usinas de reciclagem, olarias, \u00e1reas de transbordo e triagem, e solos urbanos depositados em aterros inertes da Regi\u00e3o Metropolitana de S\u00e3o Paulo.<\/p>\n\n\n\n<p>Depois de britados e peneirados, os finos atingiram a granulometria passante na peneira de 0,075 mm, semelhante \u00e0 finura do cimento Portland, em moinhos de bola. Posteriormente, foram calcinados em forno est\u00e1tico de batelada, em temperaturas entre 300\u00b0C e 600\u00b0C.<\/p>\n\n\n\n<p>Em seguida, diferentes t\u00e9cnicas f\u00edsico-qu\u00edmicas e mineral\u00f3gicas avaliaram composi\u00e7\u00f5es, fases mineral\u00f3gicas e a reatividade dos finos termoativados de RCD.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pesquisa mediu desempenho de pastas com RCD termoativados<\/h2>\n\n\n\n<p>Na sequ\u00eancia, ensaios de resist\u00eancia \u00e0 compress\u00e3o de pastas contendo 100% de finos termoativados de RCD, com rela\u00e7\u00f5es \u00e1gua\/material de 0,40 e 0,45, avaliaram seu desempenho mec\u00e2nico.<\/p>\n\n\n\n<p>Um dos resultados mostrou o aumento progressivo da resist\u00eancia mec\u00e2nica com a eleva\u00e7\u00e3o da temperatura de termoativa\u00e7\u00e3o, que passou de valores inferiores a 6 MPa para valores superiores a 12 MPa entre a temperatura m\u00ednima e m\u00e1xima de ativa\u00e7\u00e3o.<\/p>\n\n\n\n<p>Outro resultado foi o ganho de resist\u00eancia entre 7 e 28 dias, que confirmou a continuidade das rea\u00e7\u00f5es de hidrata\u00e7\u00e3o das fases ciment\u00edcias reativadas dos RCD. Por sua vez, o incremento adicional de resist\u00eancia entre 28 e 91 dias apontou para a ocorr\u00eancia de rea\u00e7\u00f5es pozol\u00e2nicas tardias associadas aos compostos ricos em s\u00edlica e alumina presentes nas fra\u00e7\u00f5es dos res\u00edduos mistos.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Pesquisa constatou viabilidade t\u00e9cnica de pavimento com RCD termoativados<\/h2>\n\n\n\n<p>Numa segunda etapa de testes, foram desenvolvidas e avaliadas diferentes combina\u00e7\u00f5es de agregados reciclados e naturais associadas ao ligante termoativado de RCD, com o objetivo de verificar sua viabilidade t\u00e9cnica para uso em infraestrutura vi\u00e1ria. As composi\u00e7\u00f5es mais promissoras foram aplicadas em escala real, na execu\u00e7\u00e3o de trechos de pavimento na Rua Miguel Biondi, em Guarulhos, o que permitiu comparar o desempenho estrutural real das solu\u00e7\u00f5es empregadas.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/site.ibracon.org.br\/Site_revista\/Concreto_Construcoes\/Concreto_blog\/wp-content\/uploads\/2026\/06\/Trecho-3-1024x768.jpg\" alt=\"Composi\u00e7\u00e3o com RCD termoativado\" class=\"wp-image-862\" srcset=\"https:\/\/site.ibracon.org.br\/Site_revista\/Concreto_Construcoes\/Concreto_blog\/wp-content\/uploads\/2026\/06\/Trecho-3-1024x768.jpg 1024w, https:\/\/site.ibracon.org.br\/Site_revista\/Concreto_Construcoes\/Concreto_blog\/wp-content\/uploads\/2026\/06\/Trecho-3-300x225.jpg 300w, https:\/\/site.ibracon.org.br\/Site_revista\/Concreto_Construcoes\/Concreto_blog\/wp-content\/uploads\/2026\/06\/Trecho-3-768x576.jpg 768w, https:\/\/site.ibracon.org.br\/Site_revista\/Concreto_Construcoes\/Concreto_blog\/wp-content\/uploads\/2026\/06\/Trecho-3-1536x1152.jpg 1536w, https:\/\/site.ibracon.org.br\/Site_revista\/Concreto_Construcoes\/Concreto_blog\/wp-content\/uploads\/2026\/06\/Trecho-3-2048x1536.jpg 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>Para saber mais, leia o artigo \u201cLigante sustent\u00e1vel obtido por termoativa\u00e7\u00e3o de res\u00edduos de constru\u00e7\u00e3o e demoli\u00e7\u00e3o\u201d, na edi\u00e7\u00e3o 122 da Revista CONCRETO &amp; Constru\u00e7\u00f5es.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>O Brasil gera cerca de 106 milh\u00f5es de toneladas de res\u00edduos de constru\u00e7\u00e3o e demoli\u00e7\u00e3o (RCD) por ano, sendo um ter\u00e7o deste montante beneficiado por usinas de reciclagem para produ\u00e7\u00e3o de agregados reciclados destinados \u00e0 constru\u00e7\u00e3o civil. Recentemente, pesquisas cient\u00edficas e tecnol\u00f3gicas t\u00eam avaliado se a fra\u00e7\u00e3o fina desses RCD, especialmente part\u00edculas inferiores a 0,30 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":863,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[4],"tags":[117,120,218],"class_list":["post-860","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-press-releases","tag-agregados-reciclados","tag-rcd","tag-residuos-termoativados"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Ligantes termoativados de fra\u00e7\u00e3o fina de RCD - Blog CONCRETO &amp; Constru\u00e7\u00f5es<\/title>\n<meta name=\"description\" content=\"RCD ativados termicamente e usados como ligante em composi\u00e7\u00f5es com agregados 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