{"id":29852,"date":"2018-06-14T08:50:27","date_gmt":"2018-06-14T06:50:27","guid":{"rendered":"https:\/\/objectif-lune.ch\/?page_id=29852"},"modified":"2024-11-16T16:27:01","modified_gmt":"2024-11-16T15:27:01","slug":"sur-l-origine-des-taches-humides","status":"publish","type":"page","link":"https:\/\/conservation-science.ch\/?page_id=29852","title":{"rendered":"Sur l’origine des taches humides"},"content":{"rendered":"
Sur l’origine des taches humides…<\/h6>\n\n\n\n
\"\"<\/a><\/td>\nLes \u00ab\u00a0taches humides\u00a0\u00bb observ\u00e9es sur les b\u00e2timents sont classiquement imput\u00e9es \u00e0 des infiltrations ou \u00e0 des remont\u00e9es capillaires, ph\u00e9nom\u00e8nes qui impliquent la pr\u00e9sence d’une grande quantit\u00e9 d’eau liquide dans la \u00ab\u00a0zone humide\u00a0\u00bb. Or, dans la majorit\u00e9 des cas, des sels hygroscopiques (tels que des chlorures* ou des nitrates**) qui adsorbent facilement et abondamment la vapeur d’eau contenue dans l’air ambiant jouent un r\u00f4le pr\u00e9pond\u00e9rant.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n
Lorsque de tels sels sont pr\u00e9sents dans les mat\u00e9riaux de construction, ils ont la propri\u00e9t\u00e9 de modifier les interactions entre la lumi\u00e8re et la mati\u00e8re poreuse qui les contient donnant \u00e0 cette derni\u00e8re un aspect plus sombre ou \u00ab\u00a0mouill\u00e9\u00a0\u00bb.
\nLes quantit\u00e9s d’eau et de sels n\u00e9cessaires pour que ces illusions d’optiques soient observables d\u00e9pendent de la nature des sels, mais la quantit\u00e9 de vapeur d’eau pr\u00e9sente dans l’air ambiant, m\u00eame par temps \u00ab\u00a0sec\u00a0\u00bb, est souvent suffisante. Les appareils de mesure d’humidit\u00e9 non destructifs, g\u00e9n\u00e9ralement sensibles aux sels, sont rarement capables de faire la distinction entre ces cas \u00ab\u00a0b\u00e9nins\u00a0\u00bb – quoique esth\u00e9tiquement d\u00e9rangeants – et les cas de r\u00e9elles infiltrations ou de remont\u00e9es capillaires, mais quelques tests de laboratoire permettent facilement et rapidement de lever l’ind\u00e9termination.<\/td>\n		\"\"<\/a><\/p>\n

 <\/p>\n

\"\"<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n
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\"\"<\/a><\/td>\n

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En conclusion<\/strong><\/em>,\u00a0avant d’entreprendre des interventions lourdes telles qu’un drainage ou la mise en place d’une \u00ab\u00a0barri\u00e8re capillaire\u00a0\u00bb quelconque, nous conseillons vivement de faire \u00e9valuer la quantit\u00e9 d’eau r\u00e9ellement pr\u00e9sente dans une ma\u00e7onnerie et \u00e9ventuellement de proc\u00e9der \u00e0 quelques analyses des sels pr\u00e9sents.<\/p>\n

* les chlorures peuvent par exemple \u00eatre apport\u00e9s par les sels de d\u00e9vergla\u00e7age ;
\n** les nitrates peuvent \u00eatre apport\u00e9s par des d\u00e9jections animales ou par des engrais.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\n","protected":false},"excerpt":{"rendered":"

Sur l’origine des taches humides… Les \u00ab\u00a0taches humides\u00a0\u00bb observ\u00e9es sur les b\u00e2timents sont classiquement imput\u00e9es \u00e0 des infiltrations ou \u00e0 des remont\u00e9es capillaires, ph\u00e9nom\u00e8nes qui impliquent la pr\u00e9sence d’une grande quantit\u00e9 d’eau liquide dans la \u00ab\u00a0zone humide\u00a0\u00bb. Or, dans la majorit\u00e9 des cas, des sels hygroscopiques (tels que des chlorures* ou des nitrates**) qui adsorbent … Continuer la lecture de Sur l’origine des taches humides<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"parent":29891,"menu_order":5,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-29852","page","type-page","status-publish","hentry"],"yoast_head":"\nSur l'origine des taches humides - Bl\u00e4uer - Conservation - Science<\/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:\/\/conservation-science.ch\/?page_id=29852\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sur l'origine des taches humides - Bl\u00e4uer - Conservation - Science\" \/>\n<meta property=\"og:description\" content=\"Sur l’origine des taches humides… Les \u00ab\u00a0taches humides\u00a0\u00bb observ\u00e9es sur les b\u00e2timents sont classiquement imput\u00e9es \u00e0 des infiltrations ou \u00e0 des remont\u00e9es capillaires, ph\u00e9nom\u00e8nes qui impliquent la pr\u00e9sence d’une grande quantit\u00e9 d’eau liquide dans la \u00ab\u00a0zone humide\u00a0\u00bb. Or, dans la majorit\u00e9 des cas, des sels hygroscopiques (tels que des chlorures* ou des nitrates**) qui adsorbent … Continuer la lecture de Sur l’origine des taches humides\" \/>\n<meta property=\"og:url\" content=\"https:\/\/conservation-science.ch\/?page_id=29852\" \/>\n<meta property=\"og:site_name\" content=\"Bl\u00e4uer - Conservation - Science\" \/>\n<meta property=\"article:modified_time\" content=\"2024-11-16T15:27:01+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/csc-sarl.ch\/wp-content\/uploads\/2018\/06\/astuce_090422_chateau_aileromane_haut90.jpg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/conservation-science.ch\/?page_id=29852\",\"url\":\"https:\/\/conservation-science.ch\/?page_id=29852\",\"name\":\"Sur l'origine des taches humides - Bl\u00e4uer - Conservation - Science\",\"isPartOf\":{\"@id\":\"https:\/\/conservation-science.ch\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/conservation-science.ch\/?page_id=29852#primaryimage\"},\"image\":{\"@id\":\"https:\/\/conservation-science.ch\/?page_id=29852#primaryimage\"},\"thumbnailUrl\":\"https:\/\/csc-sarl.ch\/wp-content\/uploads\/2018\/06\/astuce_090422_chateau_aileromane_haut90.jpg\",\"datePublished\":\"2018-06-14T06:50:27+00:00\",\"dateModified\":\"2024-11-16T15:27:01+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/conservation-science.ch\/?page_id=29852#breadcrumb\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/conservation-science.ch\/?page_id=29852\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/conservation-science.ch\/?page_id=29852#primaryimage\",\"url\":\"https:\/\/csc-sarl.ch\/wp-content\/uploads\/2018\/06\/astuce_090422_chateau_aileromane_haut90.jpg\",\"contentUrl\":\"https:\/\/csc-sarl.ch\/wp-content\/uploads\/2018\/06\/astuce_090422_chateau_aileromane_haut90.jpg\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/conservation-science.ch\/?page_id=29852#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Accueil\",\"item\":\"https:\/\/conservation-science.ch\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Accueil\",\"item\":\"https:\/\/conservation-science.ch\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Nos astuces\",\"item\":\"https:\/\/conservation-science.ch\/?page_id=29899\"},{\"@type\":\"ListItem\",\"position\":4,\"name\":\"Nos astuces archiv\u00e9es\",\"item\":\"https:\/\/conservation-science.ch\/?page_id=29891\"},{\"@type\":\"ListItem\",\"position\":5,\"name\":\"Sur l’origine des taches humides\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/conservation-science.ch\/#website\",\"url\":\"https:\/\/conservation-science.ch\/\",\"name\":\"CSC - Conservation - Sciences\",\"description\":\"Transmission de connaissances dans le domaine des sciences de la conservation du patrimoine b\u00e2ti\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/conservation-science.ch\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"fr-FR\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Sur l'origine des taches humides - Bl\u00e4uer - Conservation - Science","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/conservation-science.ch\/?page_id=29852","og_locale":"fr_FR","og_type":"article","og_title":"Sur l'origine des taches humides - Bl\u00e4uer - Conservation - Science","og_description":"Sur l’origine des taches humides… Les \u00ab\u00a0taches humides\u00a0\u00bb observ\u00e9es sur les b\u00e2timents sont classiquement imput\u00e9es \u00e0 des infiltrations ou \u00e0 des remont\u00e9es capillaires, ph\u00e9nom\u00e8nes qui impliquent la pr\u00e9sence d’une grande quantit\u00e9 d’eau liquide dans la \u00ab\u00a0zone humide\u00a0\u00bb. 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