<\/div>\n
La m\u00e9thode replica tape<\/h2>
La m\u00e9thode replica tape (ISO 8503-5, NACE RP0287, ASTM D4417 m\u00e9thode C) utilise un ruban sp\u00e9cial constitu\u00e9 d’un film de polyester recouvert d’une couche de mousse microcellulaire compressible. Le ruban est pos\u00e9 sur la surface sabl\u00e9e puis press\u00e9 et frott\u00e9 \u00e0 l’aide d’un outil d\u00e9di\u00e9 (burnishing tool) : la mousse se comprime sur les pics tout en \u00e9pousant les creux, enregistrant une empreinte tridimensionnelle du profil. L’\u00e9paisseur de la mousse comprim\u00e9e, additionn\u00e9e de celle du film support (50 \u03bcm fixes), est mesur\u00e9e avec un microm\u00e8tre num\u00e9rique d\u00e9di\u00e9 ; en retranchant les 50 \u03bcm de film, on obtient directement la valeur de profil (peak-to-valley) en microm\u00e8tres. <\/p>
Comparateurs visuels-tactiles<\/h2>
Une m\u00e9thode compl\u00e9mentaire est l’emploi de comparateurs visuels-tactiles ISO 8503-1 : des plaques m\u00e9talliques de r\u00e9f\u00e9rence \u00e0 profils calibr\u00e9s, en classes \u00ab fine \u00bb, \u00ab medium \u00bb et \u00ab coarse \u00bb, pour sablage \u00e0 la grenaille angulaire G (acier angulaire) et \u00e0 la grenaille sph\u00e9rique S (acier sph\u00e9rique). L’op\u00e9rateur compare la surface sabl\u00e9e visuellement et au toucher avec les \u00e9chantillons de r\u00e9f\u00e9rence et la classe selon les cat\u00e9gories normalis\u00e9es. C’est une m\u00e9thode rapide pour les contr\u00f4les de r\u00e9ception sur chantier, compl\u00e9mentaire de la mesure quantitative par replica tape ou par rugosim\u00e8tres portables d\u00e9di\u00e9s. <\/p>
Rugosim\u00e8tres portables d\u00e9di\u00e9s<\/h2>
Il existe en outre des rugosim\u00e8tres portables d\u00e9di\u00e9s \u00e0 la mesure du profil de sablage, \u00e0 palpeur de contact, qui balaient une courte longueur de surface et calculent le param\u00e8tre Ry ou Rt selon l’ISO 8503-4. Ils sont plus rapides que le replica tape et fournissent des donn\u00e9es num\u00e9riques enregistrables, mais exigent une manipulation correcte et un \u00e9talonnage p\u00e9riodique. Les normes les acceptent comme m\u00e9thodes de substitution au replica tape dans de nombreux cahiers des charges anticorrosion. <\/p>
Applications<\/h2>
Le contr\u00f4le du profil de sablage est exig\u00e9 dans tous les projets anticorrosion de structures m\u00e9talliques : ponts, gazoducs, navires, plateformes offshore, \u00e9changeurs, r\u00e9servoirs, grues, infrastructures ferroviaires. La v\u00e9rification a lieu apr\u00e8s le sablage et avant l’application du primaire, selon les crit\u00e8res de r\u00e9ception du cahier des charges. La documentation de la mesure (photos des replica tapes, microm\u00e8tre affichant les valeurs, fiche de campagne d’inspection) constitue la preuve objective du respect des sp\u00e9cifications. <\/p>
Normes et \u00e9talonnage<\/h2>
Les normes de r\u00e9f\u00e9rence sont l’ISO 8503 (parties 1 \u00e0 5 : types de m\u00e9thodes et modes op\u00e9ratoires correspondants), la NACE RP0287 (replica tape) et l’ASTM D4417 (m\u00e9thodes A visuelle-tactile, B au depth gauge, C replica tape). Les crit\u00e8res de choix du degr\u00e9 de rugosit\u00e9 sont fix\u00e9s par la fiche technique du primaire et par le cahier des charges (par exemple un profil moyen-grossier de 50-100 \u03bcm pour les syst\u00e8mes \u00e9poxy standard, 75-125 \u03bcm pour les syst\u00e8mes marins plus s\u00e9v\u00e8res). Les microm\u00e8tres pour replica tape doivent \u00eatre \u00e9talonn\u00e9s selon l’ISO 17025 et v\u00e9rifi\u00e9s avec des shims certifi\u00e9s. <\/p>
L’int\u00e9gration de capteurs num\u00e9riques de profil de sablage \u00e0 un logiciel de gestion de campagne permet de constituer des cartes num\u00e9riques du profil enregistr\u00e9es sur de grandes surfaces, apportant la preuve statistique de la conformit\u00e9 du traitement de pr\u00e9paration au cahier des charges de r\u00e9ception.<\/p>","protected":false},"excerpt":{"rendered":"
Instruments pour la mesure du profil peak-to-valley des surfaces sabl\u00e9es et microm\u00e8tres pour replica tape.<\/p>\n","protected":false},"author":157040980,"featured_media":0,"parent":19365,"menu_order":1,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"","_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_wpcom_ai_launchpad_about_page":false,"_wpcom_ai_launchpad_gallery_page":false,"_wpcom_ai_launchpad_contact_page":false,"_wpcom_ai_launchpad_events_page":false,"_wpcom_ai_launchpad_video_page":false,"_wpcom_ai_launchpad_portfolio_piece":false,"footnotes":""},"class_list":["post-22991","page","type-page","status-publish","hentry"],"yoast_head":"\n
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