{"id":905,"date":"2016-03-23T14:55:16","date_gmt":"2016-03-23T17:55:16","guid":{"rendered":"https:\/\/www.nachodelatorre.com.ar\/mosconi\/?p=905"},"modified":"2016-03-23T14:55:16","modified_gmt":"2016-03-23T17:55:16","slug":"como-convertir-dioxido-de-carbono-en-hormigon-sustentable-posible-ayuda-para-eliminar-dos-fuentes-importantes-de-gases-de-efecto-invernadero","status":"publish","type":"post","link":"https:\/\/www.fie.undef.edu.ar\/ceptm\/?p=905","title":{"rendered":"C\u00f3mo convertir di\u00f3xido de carbono en hormig\u00f3n sustentable. Posible ayuda para eliminar dos fuentes importantes de gases de efecto invernadero"},"content":{"rendered":"<p>Un equipo de investigaci\u00f3n de la University of California Los Angeles (UCLA)) ha desarrollado un proceso para la captura de di\u00f3xido de carbono de las chimeneas de plantas de generaci\u00f3n de energ\u00eda (la mayor fuente de gas de efecto invernadero en el mundo) y utilizar ese CO<sub>2<\/sub> para crear un nuevo material de construcci\u00f3n \u2014 CO2NCRETE \u2014 que puede ser fabricado usando impresoras 3D, que sirve de reemplazo del cemento, por lo que al mismo tiempo se reduce la producci\u00f3n de esta importante materia prima responsable de cerca del 5 por ciento de las emisiones de gases de efecto invernadero del planeta.<\/p>\n<p>Invocando analog\u00edas con los llamados morteros de la industria de la construcci\u00f3n tradicionales, este estudio examina la carbonataci\u00f3n de la portlandita (Ca(OH)<sub>2<\/sub>) empleando di\u00f3xido de carbono (CO<sub>2<\/sub>) en los estados l\u00edquidos y supercr\u00edticos como una ruta potencial de cementaci\u00f3n de balance neutral de \u00a0CO<sub>2<\/sub>. La carbonataci\u00f3n de la portlandita se produce de manera r\u00e1pida; por ejemplo, &gt; 80% carbonataci\u00f3n del Ca(OH)<sub>2<\/sub> se alcanza en 2 horas al entrar en contacto con CO<sub>2<\/sub> l\u00edquido a temperatura ambiente, y es s\u00f3lo ligeramente m\u00e1s sensible a los efectos de la temperatura, presi\u00f3n y estado de CO<sub>2<\/sub> en la gama de 6 MPa \u2264 p \u2264 10 MPa y 8\u00b0C \u2264 T \u2264 42\u00b0C. Estudios adicionales sugieren que la carbonataci\u00f3n del cemento de portland ordinario anhidro es m\u00e1s lenta y menos fiable que el de portlandita. Aunque el cementado no se eval\u00faa directamente, el estudio detallado a trav\u00e9s de el an\u00e1lisis por microscopia de escaneo electr\u00f3nico (SEM) de microestructuras carbonatadas indican que los productos de la carbonataci\u00f3n formados rodean y \u201cincorporan\u201d los granos de arena de manera similar a la observada en los morteros de cal t\u00edpicos.<!--more--><\/p>\n<p><img class=\" alignright\" src=\"http:\/\/pubs.acs.org\/appl\/literatum\/publisher\/achs\/journals\/content\/iecred\/2015\/iecred.2015.54.issue-36\/acs.iecr.5b02356\/20150910\/images\/medium\/ie-2015-02356k_0001.gif\" alt=\"Abstract Image\" \/>By invoking analogies to lime mortars of times past, this study examines the carbonation of portlandite (Ca(OH)<sub>2<\/sub>) by carbon dioxide (CO<sub>2<\/sub>) in the liquid and supercritical states as a potential route toward CO<sub>2<\/sub>-neutral cementation. Portlandite carbonation is noted to be rapid; e.g., &gt;80% carbonation of Ca(OH)<sub>2<\/sub> is achieved in 2 h upon contact with liquid CO<sub>2<\/sub> at ambient temperatures, and it is only slightly sensitive to the effects of temperature, pressure, and the state of CO<sub>2<\/sub> over the range of 6 MPa \u2264 <i>p<\/i> \u2264 10 MPa and 8 \u00b0C \u2264 <i>T<\/i> \u2264 42 \u00b0C. Additional studies suggest that the carbonation of anhydrous ordinary portland cement is slower and far less reliable than that of portlandite. Although cementation is not directly assessed, detailed scanning electron microscopy (SEM) examinations of carbonated microstructures indicate that the carbonation products formed encircle and embed sand grains similar to that observed in lime mortars. The outcomes suggest innovative directions for \u201ccarbon-neutral cementation.\u201d<\/p>\n<p><strong>Fuente:<\/strong> <em><a href=\"http:\/\/pubs.acs.org\/doi\/10.1021\/acs.iecr.5b02356\" target=\"_blank\" rel=\"noopener noreferrer\">http:\/\/pubs.acs.org<\/a><\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Un equipo de investigaci\u00f3n de la University of California Los Angeles (UCLA)) ha desarrollado un proceso para la captura de di\u00f3xido de carbono de las&hellip; <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[29,24],"tags":[],"_links":{"self":[{"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=\/wp\/v2\/posts\/905"}],"collection":[{"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=905"}],"version-history":[{"count":0,"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=\/wp\/v2\/posts\/905\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=905"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=905"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fie.undef.edu.ar\/ceptm\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=905"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}