{"id":2070,"date":"2016-01-06T16:07:03","date_gmt":"2016-01-06T15:07:03","guid":{"rendered":"https:\/\/dev.sicherheitsforum.ch\/?p=2070"},"modified":"2016-01-06T16:07:03","modified_gmt":"2016-01-06T15:07:03","slug":"feuerbestaendigen-beton-entwickelt","status":null,"type":"post","link":"https:\/\/news.save.ch\/fr\/feuerbestaendigen-beton-entwickelt\/","title":{"rendered":"B\u00e9ton r\u00e9sistant au feu d\u00e9velopp\u00e9"},"content":{"rendered":"<figure id=\"attachment_2073\" aria-describedby=\"caption-attachment-2073\" style=\"width: 680px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2073 size-medium\" src=\"https:\/\/news.save.ch\/wp-content\/uploads\/2016\/12\/Feuerbest\u00e4ndigen-Beton-entwickelt-sicherheitsforum.jpg\" width=\"680\" height=\"383\" \/><figcaption id=\"caption-attachment-2073\" class=\"wp-caption-text\">Les chercheurs de l'Empa ont test\u00e9 un \u00e9l\u00e9ment en b\u00e9ton de SHB enrichi de SAP \u00e0 l'aide d'un radiateur.<\/figcaption><\/figure>\n<p>Le bois cr\u00e9pite sous la chaleur d'un feu de chemin\u00e9e ou de camp, le b\u00e9ton subit ce que l'on appelle des \u00e9clatements lorsqu'il est expos\u00e9 \u00e0 un incendie. Ces deux effets sont dus \u00e0 des processus similaires : l'eau \u00e0 l'int\u00e9rieur d'une pi\u00e8ce de bois ou d'un support en b\u00e9ton s'\u00e9vapore en raison de la temp\u00e9rature \u00e9lev\u00e9e. Plus il y a de vapeur d'eau, plus la pression sur la structure en bois ou en b\u00e9ton augmente. Les cellules de bois \u00e9clatent, des fentes se creusent dans les b\u00fbches (le cr\u00e9pitement) ; des morceaux de b\u00e9ton se d\u00e9tachent des plafonds, des murs et des piliers de soutien. La capacit\u00e9 de charge des \u00e9l\u00e9ments de construction diminue et le risque d'effondrement du b\u00e2timent pendant l'incendie augmente.<\/p>\n<p>La r\u00e9sistance \u00e0 la chaleur d'un incendie peut \u00eatre optimis\u00e9e dans le b\u00e9ton vibr\u00e9 traditionnel en ajoutant quelques kilogrammes de fibres de polypropyl\u00e8ne (fibres PP) par m\u00e8tre cube de b\u00e9ton. En cas d'incendie, ces fibres fondent. Un r\u00e9seau de canaux subsiste et traverse le b\u00e9ton. La vapeur d'eau peut s'\u00e9chapper \u00e0 travers celui-ci, la pression \u00e0 l'int\u00e9rieur diminue et la pi\u00e8ce en b\u00e9ton reste enti\u00e8re.<\/p>\n<p><strong>Conflit d'objectifs pour les utilisateurs de b\u00e9ton : r\u00e9sistance au feu et autocompactage ?<\/strong><\/p>\n<p>Il en va autrement du b\u00e9ton autocompactant \u00e0 hautes performances (BHP) : Plus de deux kilogrammes de fibres de PP par m\u00e8tre cube de BES nuisent \u00e0 l'autocompactage. La proportion de fibres de PP dans le BPE doit donc \u00eatre suffisamment faible, ce qui a pour cons\u00e9quence qu'en cas d'incendie, aucun syst\u00e8me de canaux coh\u00e9rent ne peut se former pour emp\u00eacher l'\u00e9clatement. La question cruciale est donc la suivante : comment r\u00e9ussir \u00e0 rendre le BHS r\u00e9sistant au feu malgr\u00e9 une faible proportion de fibres de PP, et donc \u00e0 rendre les constructions plus s\u00fbres ?<\/p>\n<p>Les chercheurs de la <a href=\"https:\/\/www.empa.ch\" target=\"_blank\" data-cke-saved-href=\"https:\/\/www.empa.ch\" rel=\"noopener\">Empa<\/a>-Les d\u00e9partements \"B\u00e9ton\/chimie de la construction\" et \"Mechanical Systems Engineering\" ont trouv\u00e9 une r\u00e9ponse \u00e0 cette question. Ils ont fabriqu\u00e9 une s\u00e9rie de panneaux de b\u00e9ton \u00e0 parois minces, pr\u00e9contraints par des fils en plastique renforc\u00e9 de fibres de carbone. Chacune d'entre elles contenait deux kilogrammes de fibres de PP par m\u00e8tre cube de b\u00e9ton. Dans certaines dalles, les chercheurs ont \u00e9galement m\u00e9lang\u00e9 une petite quantit\u00e9 de polym\u00e8res superabsorbants (SAP), des plastiques sp\u00e9ciaux qui peuvent absorber plusieurs fois leur propre poids en eau. Les scientifiques ont ensuite expos\u00e9 les dalles de b\u00e9ton \u00e0 des temp\u00e9ratures allant jusqu'\u00e0 1000 \u00b0C. Apr\u00e8s 90 minutes, il s'est av\u00e9r\u00e9 que les dalles de b\u00e9ton enrichies en SAP pr\u00e9sentaient certes quelques fissures, mais que seules les dalles de b\u00e9ton sans SAP s'\u00e9taient effrit\u00e9es.<\/p>\n<p>L'explication : pendant la production du b\u00e9ton, les PAS se gorgent d'eau et gonflent plusieurs fois par rapport \u00e0 leur volume sec. Lors du durcissement du b\u00e9ton, l'eau est retir\u00e9e des SAP par l'aspiration des pores capillaires de la p\u00e2te de ciment ; les SAP r\u00e9tr\u00e9cissent, un espace vide se forme. Il relie les fibres PP s\u00e9par\u00e9es les unes des autres. Un r\u00e9seau de SAP et de fibres PP se ramifie dans l'\u00e9l\u00e9ment de construction, de sorte que celui-ci r\u00e9siste suffisamment longtemps \u00e0 la chaleur d'un incendie et que l'ouvrage reste stable.<\/p>\n<p><strong>Convient \u00e9galement pour la protection contre les incendies<\/strong><\/p>\n<p>Avec leur innovation, les chercheurs de l'Empa \u00e9largissent \u00e9galement les possibilit\u00e9s d'utiliser les avantages \u00e9conomiques et \u00e9cologiques du SHB. Le proc\u00e9d\u00e9 pour lequel une demande de brevet a \u00e9t\u00e9 d\u00e9pos\u00e9e permet par exemple d'utiliser le SHB sans frais suppl\u00e9mentaires pour la protection incendie. Jusqu'\u00e0 pr\u00e9sent, celle-ci ne pouvait \u00eatre garantie que si l'on installait par exemple un syst\u00e8me d'extinction automatique ou si l'on ajoutait un manteau d'isolation externe.<\/p>\n<p>Mais le nouveau BSE pr\u00e9sente encore un autre avantage : lors du compactage du b\u00e9ton vibr\u00e9 traditionnel, la machine vibrante produit un bruit consid\u00e9rable. Les entrepreneurs peuvent r\u00e9duire les nuisances sonores en utilisant, \u00e0 la place du b\u00e9ton vibr\u00e9, le b\u00e9ton autocompactant \u00e0 hautes performances, enrichi en SAP et tout aussi r\u00e9sistant au feu.<\/p>\n<p><em>Texte : Reto Zanettin, Empa<\/em><\/p>\n<p>&nbsp;<\/p>","protected":false},"excerpt":{"rendered":"<p>Holz knistert in der Hitze eines Kamin- oder Lagerfeuers, Beton erleidet sogenannte Abplatzungen, wenn er einem Brand ausgesetzt ist. Beide Effekte r\u00fchren von \u00e4hnlichen Vorg\u00e4ngen her: Wasser im Inneren eines Holzst\u00fccks oder Betontr\u00e4gers verdampft aufgrund der hohen Temperatur. Je mehr Wasserdampf entsteht, desto gr\u00f6sser wird der Druck auf die Holz- respektive Betonstruktur. Holzzellen platzen, Spalten [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2073,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"pgc_sgb_lightbox_settings":"","footnotes":""},"categories":[67],"tags":[105,156,108],"class_list":["post-2070","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-brandschutz","tag-brandbekaempfung","tag-brandschutz","tag-vkf"],"acf":[],"hkrextid":null,"publication":null,"issue":null,"workflow":null,"startPage":null,"spitzmarke":null,"_posts_by_tag_page_fields":{"widget_title":"","widget_tags":""},"_at_widget":"1","_yoast_wpseo_primary_category":"4","_yoast_wpseo_focuskw_text_input":"Feuerbest\u00e4ndigen Beton entwickelt","_yoast_wpseo_opengraph-image":"https:\/\/news.save.ch\/wp-content\/uploads\/2016\/12\/Feuerbest\u00e4ndigen-Beton-entwickelt-sicherheitsforum.jpg","_yoast_wpseo_opengraph-description":"Selbstverdichtender Hochleistungsbeton hatte bisher eine Schwachstelle: Er platzt im Falle eines Feuers h\u00e4ufig ab, wodurch seine Tragf\u00e4higkeit leidet. Wissenschaftler der Empa haben ein Verfahren zur Herstellung von feuerbest\u00e4ndigem Beton entwickelten, der selbst bei Br\u00e4nden lange stabil bleibt.","_yoast_wpseo_opengraph-title":"Feuerbest\u00e4ndigen Beton entwickelt","enclosure":null,"_yoast_wpseo_twitter-title":null,"_yoast_wpseo_twitter-description":null,"_yoast_wpseo_twitter-image":null,"_wp_old_slug":null,"_yoast_wpseo_title":null,"_yoast_wpseo_canonical":null,"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Feuerbest\u00e4ndigen Beton entwickelt - Save<\/title>\n<meta name=\"description\" content=\"Wissenschaftler der Empa haben ein Verfahren zur Herstellung von feuerbest\u00e4ndigem Beton entwickelten, der selbst bei Br\u00e4nden lange stabil bleibt.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/news.save.ch\/fr\/feuerbestaendigen-beton-entwickelt\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Feuerbest\u00e4ndigen Beton entwickelt\" \/>\n<meta property=\"og:description\" content=\"Selbstverdichtender Hochleistungsbeton hatte bisher eine Schwachstelle: Er platzt im Falle eines Feuers h\u00e4ufig ab, wodurch seine Tragf\u00e4higkeit leidet. 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