{"id":153331,"date":"2026-04-14T10:13:49","date_gmt":"2026-04-14T08:13:49","guid":{"rendered":"https:\/\/www.immo-invest.ch\/das-holz-das-sich-selbst-schuetzt\/"},"modified":"2026-04-14T11:54:32","modified_gmt":"2026-04-14T09:54:32","slug":"das-holz-das-sich-selbst-schuetzt","status":"publish","type":"post","link":"https:\/\/www.immo-invest.ch\/fr\/das-holz-das-sich-selbst-schuetzt\/","title":{"rendered":"Le bois qui se prot\u00e8ge"},"content":{"rendered":"\n\n<p class=\"wp-block-paragraph\">Des millions de tonnes de sciure sont produites chaque ann\u00e9e dans le monde. La plus grande partie est br\u00fbl\u00e9e, le CO2 li\u00e9 au bois retourne dans l&rsquo;atmosph\u00e8re. C&rsquo;est pr\u00e9cis\u00e9ment l\u00e0 qu&rsquo;intervient l&rsquo;\u00e9quipe de recherche du doctorant Ronny K\u00fcrsteiner, sous la direction d&rsquo;Ingo Bungert, professeur de mat\u00e9riaux \u00e0 base de bois \u00e0 l&rsquo;EPF de Zurich. L&rsquo;objectif est de garder la sciure plus longtemps dans le cycle des mat\u00e9riaux.<\/p>\n\n\n\n\n\n<p class=\"wp-block-paragraph\"><strong>L&rsquo;astuce avec le noyau de past\u00e8que<br><\/strong>Le liant est la struvite, un phosphate d&rsquo;ammonium et de magn\u00e9sium cristallin aux propri\u00e9t\u00e9s ignifuges connues. Le probl\u00e8me jusqu&rsquo;\u00e0 pr\u00e9sent \u00e9tait que la struvite se liait mal \u00e0 la sciure de bois en raison de son comportement de cristallisation. Les chercheurs ont trouv\u00e9 la solution dans une enzyme extraite de graines de past\u00e8que. Cette enzyme contr\u00f4le la cristallisation de mani\u00e8re \u00e0 ce que de gros cristaux de struvite se forment et remplissent les espaces vides entre les particules de sciure, les liant solidement entre elles. Le mat\u00e9riau compress\u00e9 est ensuite s\u00e9ch\u00e9 \u00e0 temp\u00e9rature ambiante.<\/p>\n\n\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Trois fois plus longtemps que le bois d&rsquo;\u00e9pic\u00e9a<br><\/strong>Les tests d&rsquo;incendie r\u00e9alis\u00e9s \u00e0 l&rsquo;\u00e9cole polytechnique de Turin parlent d&rsquo;eux-m\u00eames. Dans un calorim\u00e8tre \u00e0 c\u00f4ne, une m\u00e9thode d&rsquo;essai standardis\u00e9e pour l&rsquo;action de la chaleur, du bois d&rsquo;\u00e9pic\u00e9a non trait\u00e9 a pris feu apr\u00e8s environ 15 secondes. Le composite struvite-sciure a mis plus de trois fois plus de temps. Une fois en feu, le mat\u00e9riau forme rapidement une couche protectrice de mati\u00e8re inorganique et de carbone qui freine la propagation. De plus, la struvite lib\u00e8re de la vapeur d&rsquo;eau et de l&rsquo;ammoniaque sous l&rsquo;effet de la chaleur, ce qui a un effet refroidissant et prive le feu d&rsquo;oxyg\u00e8ne.<\/p>\n\n\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Plus l\u00e9ger que le ciment, meilleur pour le climat<br><\/strong>Les panneaux de particules traditionnels li\u00e9s au ciment, aujourd&rsquo;hui tr\u00e8s r\u00e9pandus dans l&rsquo;am\u00e9nagement int\u00e9rieur, sont compos\u00e9s de 60 \u00e0 70 % de ciment en poids. Ils sont lourds et nuisent au climat lors de leur fabrication. Les nouveaux panneaux de sciure de struvite se contentent de 40 pour cent de liant. Ils sont plus l\u00e9gers, ont un bilan climatique nettement meilleur et n&rsquo;atterrissent pas dans les d\u00e9charges sp\u00e9ciales apr\u00e8s la d\u00e9molition.<\/p>\n\n\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Recyclables et utilisables comme engrais<br><\/strong>Le composite peut \u00eatre d\u00e9compos\u00e9 en ses composants. M\u00e9caniquement dans le broyeur, puis chauff\u00e9 \u00e0 un peu plus de 100 degr\u00e9s, ce qui lib\u00e8re de l&rsquo;ammoniaque et permet de tamiser la sciure. Le mat\u00e9riau min\u00e9ral de base, la newberyite, tombe sous forme solide et peut \u00eatre \u00e0 nouveau transform\u00e9 en struvite. Si l&rsquo;on ne recycle pas le mat\u00e9riau, on peut l&rsquo;utiliser comme engrais \u00e0 long terme. La struvite lib\u00e8re lentement et de mani\u00e8re contr\u00f4l\u00e9e le phosphore, l&rsquo;azote et le magn\u00e9sium dans le sol.<\/p>\n\n\n\n\n\n<p class=\"wp-block-paragraph\"><strong>La station d&rsquo;\u00e9puration comme source de mati\u00e8re premi\u00e8re<br><\/strong>Un autre cycle se dessine. La struvite est produite en grande quantit\u00e9 comme sous-produit ind\u00e9sirable dans les stations d&rsquo;\u00e9puration, o\u00f9 elle bouche les tuyaux et doit \u00eatre \u00e9limin\u00e9e \u00e0 grands frais. \u00ab\u00a0Nous pourrions utiliser ces d\u00e9p\u00f4ts comme mat\u00e9riau de base pour notre mat\u00e9riau de construction\u00a0\u00bb, explique K\u00fcrsteiner. Le fait que le mat\u00e9riau s&rsquo;impose sur le march\u00e9 d\u00e9pend en premier lieu du co\u00fbt du liant. Un probl\u00e8me qui pourrait \u00eatre r\u00e9solu gr\u00e2ce \u00e0 cette source.<\/p>\n\n","protected":false},"excerpt":{"rendered":"<p>Aujourd&rsquo;hui, la sciure de bois finit g\u00e9n\u00e9ralement dans le four. Demain, elle pourrait prot\u00e9ger les maisons contre le feu. Des chercheurs de l&rsquo;ETH Zurich et de l&rsquo;Empa ont d\u00e9velopp\u00e9 un mat\u00e9riau composite qui associe les d\u00e9chets de bois au min\u00e9ral struvite et atteint ainsi la classe de r\u00e9sistance au feu des panneaux de ciment traditionnels. Le mat\u00e9riau se prot\u00e8ge lui-m\u00eame, peut \u00eatre recycl\u00e9 et provient en partie de stations d&rsquo;\u00e9puration.<\/p>\n","protected":false},"author":2,"featured_media":153332,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_surecart_dashboard_logo_width":"180px","_surecart_dashboard_show_logo":true,"_surecart_dashboard_navigation_orders":true,"_surecart_dashboard_navigation_invoices":true,"_surecart_dashboard_navigation_subscriptions":true,"_surecart_dashboard_navigation_downloads":true,"_surecart_dashboard_navigation_billing":true,"_surecart_dashboard_navigation_account":true,"inline_featured_image":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[22699,22357,55976,4957],"tags":[40689,58412,872,3931,19419,2002,58413],"class_list":["post-153331","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-durabilite","category-industrie-du-batiment","category-institutions-formation","category-region-zurich","tag-brandschutz-fr","tag-holzwerkstoff","tag-immoinvest-fr","tag-immonews-fr","tag-kreislaufwirtschaft-fr","tag-news-fr","tag-saegemehl-2"],"acf":{"bild_mit_ki_erstellt_worden":"","lead":"Aujourd'hui, la sciure de bois finit g\u00e9n\u00e9ralement dans le four. Demain, elle pourrait prot\u00e9ger les maisons contre le feu. Des chercheurs de l'ETH Zurich et de l'Empa ont d\u00e9velopp\u00e9 un mat\u00e9riau composite qui associe les d\u00e9chets de bois au min\u00e9ral struvite et atteint ainsi la classe de r\u00e9sistance au feu des panneaux de ciment traditionnels. Le mat\u00e9riau se prot\u00e8ge lui-m\u00eame, peut \u00eatre recycl\u00e9 et provient en partie de stations d'\u00e9puration.","autor":"","ort":"","bildunterschrift":"Image : Dan Vivas Glaser \/ tir\u00e9 de K\u00fcrsteiner R et al. Chem Circularity 2026, CC BY 4.0","zusammenfassung":"","bild_im_grid":false,"gallerie":"","newsim":""},"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"Aujourd&#039;hui, la sciure de bois finit g\u00e9n\u00e9ralement dans le four. Demain, elle pourrait prot\u00e9ger les maisons contre le feu. 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