{"id":24233,"date":"2018-06-18T06:00:55","date_gmt":"2018-06-18T04:00:55","guid":{"rendered":"https:\/\/breinco.com\/breincosmartblog\/beton-a-ultra-hautes-performances-uhpc-le-beton-du-xxie-siecle\/"},"modified":"2018-06-18T06:00:55","modified_gmt":"2018-06-18T04:00:55","slug":"beton-a-ultra-hautes-performances-uhpc-le-beton-du-xxie-siecle","status":"publish","type":"post","link":"https:\/\/breinco.com\/fr\/breincosmartblog\/beton-a-ultra-hautes-performances-uhpc-le-beton-du-xxie-siecle\/","title":{"rendered":"B\u00e9ton \u00e0 ultra-hautes performances (UHPC). Le b\u00e9ton du XXIe si\u00e8cle"},"content":{"rendered":"<h4>B\u00e9tons UHPC (Ultra-High Performance Concrete)<\/h4>\n<p> <img decoding=\"async\" class=\"aligncenter wp-image-1026\" src=\"https:\/\/www.breinco.com\/smartideas\/wp-content\/uploads\/2018\/06\/logo-300x214.jpg\" alt=\"\" width=\"210\" height=\"150\" \/>  <\/p>\n<h5>Comment sont-ils appel\u00e9s \u00e0 l\u2019international ?<\/h5>\n<p> Ce sont des b\u00e9tons fibr\u00e9s, avec des proportions \u00e9lev\u00e9es de fibres, \u00e0 tel point qu\u2019ils ne sont plus seulement appel\u00e9s UHPC \u00e0 l\u2019international mais UHPFRC, c\u2019est-\u00e0-dire <strong>Ultra High Performance Fiber Reinforced Concrete<\/strong> ; en fran\u00e7ais BFUP : B\u00e9ton Fibr\u00e9 \u00e0 Ultra-Haute Performance.  <\/p>\n<h5>Avec quel type de fibres sont-ils fabriqu\u00e9s ? Quels avantages apportent les fibres au b\u00e9ton ?<\/h5>\n<p> Les fibres, tr\u00e8s fines de 2 \u00e0 3 dixi\u00e8mes de millim\u00e8tre d\u2019\u00e9paisseur, g\u00e9n\u00e9ralement en acier recouvert de cuivre ou de laiton, sont pr\u00e9sentes en proportions \u00e9lev\u00e9es, jusqu\u2019\u00e0 environ 150 kg\/m\u00b3. Elles ne sont pas n\u00e9cessaires uniquement pour atteindre la r\u00e9sistance exig\u00e9e, mais pour garantir la ductilit\u00e9, c\u2019est-\u00e0-dire un comportement non fragile.  <\/p>\n<h5>Quelle est la consistance du b\u00e9ton UHPC ?<\/h5>\n<p> Ce sont des b\u00e9tons \u201cWet-Cast\u201d, et non \u201cDry-Cast\u201d, m\u00eame si cela reste possible. Si un industriel parvenait \u00e0 compacter un b\u00e9ton Dry-Cast avec la r\u00e9sistance et la ductilit\u00e9 requises, ce serait une avanc\u00e9e majeure, les dry-cast \u00e9tant associ\u00e9s \u00e0 de fortes capacit\u00e9s industrielles et de production.  <\/p>\n<h5>Existe-t-il une norme en vigueur ?<\/h5>\n<p> \u00c0 la date de juin 2018, il n\u2019existe pas encore de norme ou d\u2019instruction espagnole, mais elle est en cours d\u2019\u00e9laboration. Il existe toutefois une norme fran\u00e7aise apparue il y a deux ans ainsi qu\u2019une norme suisse.  <\/p>\n<h5>Quelles sont les caract\u00e9ristiques en compression d\u2019un b\u00e9ton UHPC ? Rapport eau\/ciment ?<\/h5>\n<p> Ils doivent pr\u00e9senter une r\u00e9sistance caract\u00e9ristique \u00e0 la compression minimale de <strong>150 m\u00e9gapascals<\/strong>, soit environ 1 500 kg\/cm\u00b2. Ils sont contr\u00f4l\u00e9s non seulement en compression mais aussi en traction directe et en flexion. La rupture doit toujours se produire au-del\u00e0 de la limite de proportionnalit\u00e9 contrainte-d\u00e9formation, donc avec une certaine ductilit\u00e9.  Une r\u00e9sistance de 130 MPa peut \u00eatre accept\u00e9e lorsque l\u2019UHPFRC r\u00e9pond \u00e0 des exigences esth\u00e9tiques ou architecturales particuli\u00e8res.  Bien qu\u2019il s\u2019agisse de b\u00e9tons \u201cwet-cast\u201d, g\u00e9n\u00e9ralement autopla\u00e7ants, ils peuvent contenir moins d\u2019eau que certains dry-cast, avec des rapports eau\/ciment entre 0,18 et 0,22. Cela est rendu possible gr\u00e2ce \u00e0 des superplastifiants r\u00e9ducteurs d\u2019eau et \u00e0 des granulom\u00e9tries tr\u00e8s fines. La taille maximale des granulats ne d\u00e9passe souvent pas 1 mm.  Les dosages en ciment sont \u00e9lev\u00e9s, autour de 800 kg\/m\u00b3, compl\u00e9t\u00e9s par environ 200 kg\/m\u00b3 de \u201cfum\u00e9e de silice\u201d tr\u00e8s r\u00e9active.  <\/p>\n<h5>Quelle est la durabilit\u00e9 d\u2019un b\u00e9ton UHPC ?<\/h5>\n<p> Il est tr\u00e8s compact, avec une tr\u00e8s faible absorption et perm\u00e9abilit\u00e9, ce qui lui conf\u00e8re une durabilit\u00e9 nettement sup\u00e9rieure aux b\u00e9tons traditionnels.  Le professeur qui pr\u00e9sente souvent la norme suisse en congr\u00e8s dit : \u201cUHPFRC IS NOT A CONCRETE\u201d, autrement dit <strong>\u201cl\u2019UHPC n\u2019est pas un b\u00e9ton\u201d<\/strong> : c\u2019est r\u00e9ellement un nouveau mat\u00e9riau.  Il peut \u00eatre arm\u00e9, pr\u00e9contraint ou postcontraint, ce qui permet des \u00e9l\u00e9ments structurels extr\u00eamement l\u00e9gers. En Suisse, il est utilis\u00e9 pour la r\u00e9paration de tabliers de ponts d\u00e9grad\u00e9s ; en France, pour divers \u00e9l\u00e9ments pr\u00e9fabriqu\u00e9s architecturaux. En Espagne, certaines r\u00e9alisations revendiquent l\u2019usage de l\u2019UHPC, mais seules les \u00e9quipes autour du <a href=\"https:\/\/www.linkedin.com\/in\/pedro-serna-a2618b12\/\">professeur Pedro Serna<\/a> de l\u2019Universit\u00e9 polytechnique de Valence ont r\u00e9ellement atteint des performances sup\u00e9rieures \u00e0 150 MPa en conditions r\u00e9elles hors laboratoire.  <\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/es.linkedin.com\/in\/francisco-javier-reg%C3%A1s-arimany-b0670415a\">Javier Regas<\/a> Ing\u00e9nieur consultant chez Architectonic Concrete S.L. depuis 1999.<\/p>\n<p>  &nbsp;  <img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-1023\" src=\"https:\/\/www.breinco.com\/smartideas\/wp-content\/uploads\/2018\/06\/la-gardunya-mobiliario-hormigon-uhpc.jpg\" alt=\"mobilier urbain b\u00e9ton UHPC\" width=\"700\" height=\"500\" \/>  <img decoding=\"async\" class=\"aligncenter size-full wp-image-1024\" src=\"https:\/\/www.breinco.com\/smartideas\/wp-content\/uploads\/2018\/06\/dibujo-mobiliario-urbano.jpg\" alt=\"dessin mobilier urbain\" width=\"700\" height=\"500\" \/>  &nbsp;  <\/p>\n<h4><a href=\"https:\/\/breinco.com\/fr\/wet-cast\/\">Finitions de surface<\/a> du b\u00e9ton UHPC<\/h4>\n<h4>Finition SIMPLE \u201csortie de moule\u201d<\/h4>\n<p> Une pi\u00e8ce peut \u00eatre moul\u00e9e avec un aspect totalement lisse gr\u00e2ce au moule, de sorte qu\u2019il suffit de nettoyer sa surface, sans textures ni reliefs, en veillant \u00e0 ce que les ar\u00eates soient bien d\u00e9finies (id\u00e9alement avec un l\u00e9ger chanfrein) afin d\u2019\u00e9viter l\u2019\u00e9caillage. Il est \u00e9galement possible d\u2019int\u00e9grer un motif dans le moule afin de donner un effet particulier et de rendre la pi\u00e8ce unique.  Selon le motif du moule, la pi\u00e8ce peut pr\u00e9senter des aspects tr\u00e8s vari\u00e9s. Les possibilit\u00e9s sont infinies et laiss\u00e9es au choix du cr\u00e9ateur : reliefs plus ou moins prononc\u00e9s, reproduction de dessins, photographies ou textures singuli\u00e8res. Ainsi, fa\u00e7ades, pavements ou \u00e9l\u00e9ments de mobilier gagnent en caract\u00e8re.  <img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1019\" src=\"https:\/\/www.breinco.com\/smartideas\/wp-content\/uploads\/2018\/06\/acabado-superficial-simple-hormig\u00f3n.jpg\" alt=\"finition superficielle simple\" width=\"700\" height=\"500\" \/>  <\/p>\n<h4>Finition STRIP \u201cd\u00e9cap\u00e9e\u201d<\/h4>\n<p> La finition d\u00e9cap\u00e9e strip\u00ae est l\u00e9g\u00e8rement rugueuse au toucher. Elle laisse appara\u00eetre la forme et la couleur naturelle des granulats sur une surface lisse mais textur\u00e9e. Elle offre des couleurs vives et intenses, avec un aspect min\u00e9ral tr\u00e8s d\u00e9fini et durable.  La technique consiste \u00e0 retirer quelques dixi\u00e8mes de millim\u00e8tre de la couche de b\u00e9ton en contact avec le moule \u00e0 l\u2019aide de retardateurs de prise. Apr\u00e8s d\u00e9moulage, la surface est lav\u00e9e \u00e0 haute pression pour r\u00e9v\u00e9ler les granulats et obtenir la texture souhait\u00e9e.  <img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1021\" src=\"https:\/\/www.breinco.com\/smartideas\/wp-content\/uploads\/2018\/06\/acabado-superficial-strip-hormigon.jpg\" alt=\"finition strip\" width=\"700\" height=\"500\" \/>  <\/p>\n<h4>R\u00e9sum\u00e9 des sp\u00e9cifications techniques du b\u00e9ton UHPC<\/h4>\n<p> <strong>R\u00e9sistance \u00e0 la compression :<\/strong> caract\u00e9ristique essentielle pour la prescription et le contr\u00f4le qualit\u00e9 de tout b\u00e9ton. M\u00eame pour des \u00e9l\u00e9ments non structurels, on travaille g\u00e9n\u00e9ralement avec des r\u00e9sistances sup\u00e9rieures \u00e0 45 MPa afin de permettre un d\u00e9moulage rapide sans fissuration.  <strong>R\u00e9sistance \u00e0 la flexion :<\/strong> li\u00e9e au risque de fissuration sous efforts de flexion et directement associ\u00e9e \u00e0 la durabilit\u00e9. Elle doit \u00eatre sup\u00e9rieure \u00e0 5 MPa pour les pi\u00e8ces sensibles \u00e0 la manipulation ou \u00e0 la position structurelle.  <strong>Absorption et r\u00e9sistance au gel :<\/strong> l\u2019absorption d\u2019eau influence la durabilit\u00e9 et l\u2019esth\u00e9tique. Elle est essentielle pour garantir la r\u00e9sistance au gel dans les climats concern\u00e9s.  <strong>R\u00e9sistance \u00e0 l\u2019abrasion :<\/strong> d\u00e9pend fortement de la granulom\u00e9trie des granulats pour atteindre des performances \u00e9lev\u00e9es.  <strong>R\u00e9sistance aux impacts :<\/strong> selon la norme UNE EN 127748-1\/2006 : hauteur de rupture par bille d\u2019acier de 1 kg > 200 cm.  <img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-1050\" src=\"https:\/\/www.breinco.com\/smartideas\/wp-content\/uploads\/2018\/06\/hormig\u00f3n-uhpc-alta-resistencia.jpg\" alt=\"b\u00e9ton UHPC haute r\u00e9sistance\" width=\"700\" height=\"500\" \/>  &nbsp;  <\/p>\n<h4>Diff\u00e9rences et points communs entre le b\u00e9ton UHPC et le b\u00e9ton GRC<\/h4>\n<p> https:\/\/www.youtube.com\/watch?v=MFRIaH2YKXQ  Bibliographie : <a href=\"https:\/\/www.architectonicconcretesl.com\">Architectonic Concrete SL<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>C\u2019est un type de b\u00e9ton de nouvelle g\u00e9n\u00e9ration qui permet de concevoir et de produire des formes complexes, \u00e0 la fois tr\u00e8s r\u00e9sistantes, tr\u00e8s l\u00e9g\u00e8res et \u00e9lanc\u00e9es. Il pr\u00e9sente une r\u00e9sistance \u00e9lev\u00e9e \u00e0 la compression, \u00e0 la flexion et \u00e0 l\u2019usure, ainsi qu\u2019une grande durabilit\u00e9. Il s\u2019agit d\u2019un b\u00e9ton de consistance fluide\/liquide qui pr\u00e9sente une faible absorption d\u2019eau. Il est fabriqu\u00e9 avec des fibres polym\u00e8res, inorganiques ou m\u00e9talliques, ainsi que des granulats siliceux d\u2019une taille maximale de 1 mm.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1056],"tags":[1775,1776],"class_list":["post-24233","post","type-post","status-publish","format-standard","hentry","category-corporative","tag-hormigon-uhpc","tag-wet-cast"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>B\u00e9ton \u00e0 ultra-hautes performances (UHPC). Le b\u00e9ton du XXIe si\u00e8cle - Breinco<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/breinco.com\/fr\/breincosmartblog\/beton-a-ultra-hautes-performances-uhpc-le-beton-du-xxie-siecle\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"B\u00e9ton \u00e0 ultra-hautes performances (UHPC). Le b\u00e9ton du XXIe si\u00e8cle - Breinco\" \/>\n<meta property=\"og:description\" content=\"C\u2019est un type de b\u00e9ton de nouvelle g\u00e9n\u00e9ration qui permet de concevoir et de produire des formes complexes, \u00e0 la fois tr\u00e8s r\u00e9sistantes, tr\u00e8s l\u00e9g\u00e8res et \u00e9lanc\u00e9es. Il pr\u00e9sente une r\u00e9sistance \u00e9lev\u00e9e \u00e0 la compression, \u00e0 la flexion et \u00e0 l\u2019usure, ainsi qu\u2019une grande durabilit\u00e9. Il s\u2019agit d\u2019un b\u00e9ton de consistance fluide\/liquide qui pr\u00e9sente une faible absorption d\u2019eau. 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