{"id":23853,"date":"2018-06-18T06:00:55","date_gmt":"2018-06-18T04:00:55","guid":{"rendered":"https:\/\/breinco.com\/breincosmartblog\/formigo-dultra-alta-resistencia-uhpc-formigo-del-segle-xxi\/"},"modified":"2018-06-18T06:00:55","modified_gmt":"2018-06-18T04:00:55","slug":"formigo-dultra-alta-resistencia-uhpc-formigo-del-segle-xxi","status":"publish","type":"post","link":"https:\/\/breinco.com\/ca\/breincosmartblog\/formigo-dultra-alta-resistencia-uhpc-formigo-del-segle-xxi\/","title":{"rendered":"Formig\u00f3 d\u2019ultra-alta resist\u00e8ncia (UHPC). Formig\u00f3 del segle XXI"},"content":{"rendered":"<h4>El formig\u00f3 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>Com es denomina internacionalment?<\/h5>\n<p> \u00f3n formigons amb fibres, amb elevades proporcions de fibres, fins al punt que \u00e9s obligatori i ja no es denominen internacionalment com a UHPC, sin\u00f3 com a UHPFRC, \u00e9s a dir, <strong>Ultra High<\/strong> <strong>Performance Fiber Reinforced Concrete<\/strong>; en franc\u00e8s BFUP: B\u00e9ton Fibr\u00e9 \u00e0 Ultra-Haute Performance. <\/p>\n<h5>Amb quin tipus de fibres es fabriquen? Quins avantatges aporten les fibres al formig\u00f3?<\/h5>\n<p> Les fibres, molt fines de 2 o 3 d\u00e8cimes de mil\u00b7l\u00edmetre de gruix, normalment d\u2019acer recobert de coure o llaut\u00f3, estan en proporcions tan altes com uns 150 quilograms per m\u00b3, i no \u00e9s que siguin necess\u00e0ries per assolir la resist\u00e8ncia exigida, sin\u00f3 per aconseguir-la amb ductilitat, \u00e9s a dir, sense fragilitat. <\/p>\n<h5>Quina consist\u00e8ncia t\u00e9 el formig\u00f3 UHPC?<\/h5>\n<p> \u00c9s formig\u00f3 \u201cWet-Cast\u201d, no \u00e9s \u201cDry-Cast\u201d, encara que no s\u2019impedeix que ho siguin. Si algun industrial aconsegu\u00eds compactar un formig\u00f3 Dry-Cast amb la resist\u00e8ncia i ductilitat exigida, seria un gran assoliment, ja que els dry cast s\u2019associen a fortes capacitats industrials i de mercat. <\/p>\n<h5>Existeix normativa vigent?<\/h5>\n<p> Al mes de juny de 2018, encara no hi ha Norma o Instrucci\u00f3 espanyola, s\u2019est\u00e0 elaborant. Hi ha norma francesa i tamb\u00e9 norma su\u00efssa. <\/p>\n<h5>Quines s\u00f3n les caracter\u00edstiques de compressi\u00f3 d\u2019un formig\u00f3 UHPC? Relaci\u00f3 aigua\/ciment?<\/h5>\n<p> Han de tenir una resist\u00e8ncia a compressi\u00f3 caracter\u00edstica m\u00ednima de <strong>150 MegaPascals<\/strong> \u00e9s a dir uns 1.500 \u201ckilos por centimetro cuadrado\u201d i es controlen no nom\u00e9s a compressi\u00f3 sin\u00f3 tamb\u00e9 a tracci\u00f3 directa i flexotracci\u00f3. La ruptura ha de produir-se m\u00e9s enll\u00e0 del l\u00edmit de proporcionalitat tensi\u00f3-deformaci\u00f3, amb certa ductilitat.  Se acepta que la resistencia a compresi\u00f3n sea de \u201csolamente\u201d 130 MegaPascals en el caso de que el UHPFRC deba responder a una exigencia especialmente est\u00e9tica o arquitect\u00f3nica.  Tot i ser formigons \u201cwet-cast\u201d autocompactants, poden tenir menys aigua que un dry-cast, amb relacions aigua\/ciment entre 0,18 i 0,22. Aix\u00f2 s\u2019aconsegueix amb els additius fluidificants-reductors d\u2019aigua d\u2019alt rang i amb granulometries molt fines. La mida m\u00e0xima de l\u2019\u00e0rid de molts UHPFRC no arriba a un mil\u00b7l\u00edmetre. Les dosificacions de ciment s\u00f3n elevades, al voltant de 800 kg\/m\u00b3, que es complementen amb uns 200 kg\/m\u00b3 addicionals de \u201cfum de s\u00edlice\u201d el m\u00e9s reactiu possible. <\/p>\n<h5>Quina durabilitat t\u00e9 un formig\u00f3 UHPC?<\/h5>\n<p> Resulta molt compacte, amb una absorci\u00f3 i permeabilitat molt baixes, i per tant amb una durabilitat molt superior a la dels formigons tradicionals. El professor que sol explicar la norma su\u00efssa en congressos sovint diu: \u201cUHPFRC IS NOT A CONCRETE\u201d, \u00e9s a dir <strong>\u201cl\u2019UHPC, NO \u00e9s formig\u00f3\u201d<\/strong> i \u00e9s que realment \u00e9s un nou material.  Es pot armar i pretensar o postensar, per tant s&#8217;utilitza per a elements estructurals que poden resultar espectacularment lleugers. A Su\u00efssa s&#8217;est\u00e0 fent servir en reparacions de taulers de ponts deteriorats. A Fran\u00e7a, en prefabricats arquitect\u00f2nics molt variats. A Espanya hi ha qui presumeix de fer UHPC, per\u00f2 nom\u00e9s \u00e9s una presumpci\u00f3 perqu\u00e8 nom\u00e9s l&#8217;equip d&#8217;enginyers entorn al <a href=\"https:\/\/www.linkedin.com\/in\/pedro-serna-a2618b12\/\" target=\"_blank\" rel=\"noopener\">Profesor Pedro Serna<\/a>, de la Universitat Polit\u00e8cnica de Val\u00e8ncia, ho ha materialitzat en realitzacions fora de laboratori, en resist\u00e8ncies de m\u00e9s de 150. <\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/es.linkedin.com\/in\/francisco-javier-reg%C3%A1s-arimany-b0670415a\" target=\"_blank\" rel=\"noopener\">Javier Regas<\/a>\u00a0\u00a0 Enginyer Consultor a Architectonic Concrete S.L. des de 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=\"mobiliario urbano hormigon 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=\"dibujo mobiliario urbano\" width=\"700\" height=\"500\" \/> <\/p>\n<h4><\/h4>\n<p> &nbsp; <\/p>\n<h4><a href=\"https:\/\/www.breinco.com\/es\/wetcast\">Acabats superficials<\/a> del formig\u00f3 UHPC<\/h4>\n<h4>Acabat superficial SIMPLE \u00absortit de motlle\u00bb<\/h4>\n<p> Una pe\u00e7a pot emmotllar-se amb l&#8217;aspecte totalment llis que li concedeix el motlle de manera que, per a la preparaci\u00f3, nom\u00e9s haguem de netejar la seva superf\u00edcie, sense textures ni relleus, vigilant en tot moment que les aristes quedin ben configurades (preferiblement amb un petit bisell) i evitar aix\u00ed l&#8217;escantellament. Tamb\u00e9 es pot col\u00b7locar un motiu al motlle que li doni un efecte particular i converteixi la pe\u00e7a en un element \u00fanic i diferenciador.  En funci\u00f3 del motiu del motlle, la pe\u00e7a pot presentar un aspecte molt variat. <strong>Les possibilitats s\u00f3n infinites<\/strong> i a gust del creador. Des de la possibilitat d&#8217;emmotllar elements amb poc o molt relleu, fins a reproduir un dibuix, una fotografia o una textura singular a la superf\u00edcie. D&#8217;aquesta manera, la fa\u00e7ana, el paviment o l&#8217;element de mobiliari guanya car\u00e0cter.  <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=\"acabado superficial simple\" width=\"700\" height=\"500\" \/> <\/p>\n<h4>Acabat superficial STRIP \u00abdecapat\u201d<\/h4>\n<p> L&#8217;acabat decapat strip\u00ae \u00e9s lleugerament rug\u00f3s al tacte. Deixa a la vista la forma i el color natural dels \u00e0rids, sobre una superf\u00edcie llisa per\u00f2 amb una textura sorrenca. Aquest acabat aconsegueix uns colors brillants e intensos que permeten obtenir un aspecte mineral amb una gran definici\u00f3 i durabilitat dels detalls.  La t\u00e8cnica consisteix a eliminar d\u00e8cimes de mil\u00b7l\u00edmetre de la capa de formig\u00f3 que estaven en contacte amb el motlle mitjan\u00e7ant productes que retarden l&#8217;enduriment del formig\u00f3. Un cop es desmotlla la pe\u00e7a, es renta la superf\u00edcie desactivada amb aigua a pressi\u00f3. Aix\u00ed, els \u00e0rids es fan m\u00e9s o menys patents i la superf\u00edcie queda amb una textura m\u00e9s o menys marcada.  <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=\"acabado superficial strip\" width=\"700\" height=\"500\" \/> <\/p>\n<h4>Resum especificacions t\u00e8cniques formig\u00f3 UHPC<\/h4>\n<p> <strong>Resist\u00e8ncia a la compressi\u00f3:<\/strong> \u00c9s la caracter\u00edstica m\u00e9s habitual tant per a la prescripci\u00f3 com per al control de qualitat de qualsevol tipus de formig\u00f3. Tot i que l&#8217;element que es vulgui fabricar no sigui estructural, pr\u00e0cticament sempre es treballa amb resist\u00e8ncies superiors a 45 MPa. La ra\u00f3: cal obtenir una alta resist\u00e8ncia transcorregudes 20-24 hores per poder desmotllar cada dia sense risc de fissures o trencaments.  <strong>Resist\u00e8ncia a la flexotracci\u00f3:<\/strong> Es relaciona amb el risc d&#8217;aparici\u00f3 de fissures per esfor\u00e7os de flexi\u00f3. Aquest factor est\u00e0 estretament relacionat amb la durabilitat. Aquesta resist\u00e8ncia ha de ser superior a 5 MPa per a les peces que presentin un risc especial de manipulaci\u00f3 o per la seva posici\u00f3 constructiva.  <strong>Coeficient d&#8217;absorci\u00f3 i resist\u00e8ncia a les gelades:<\/strong> El coeficient d&#8217;absorci\u00f3 d&#8217;aigua no nom\u00e9s influeix en la durabilitat, sin\u00f3 que tamb\u00e9 afecta directament l&#8217;est\u00e8tica del producte. A m\u00e9s, \u00e9s la caracter\u00edstica clau per aconseguir l&#8217;adequada resist\u00e8ncia a la gelades en climatologies on sigui necessari.  <strong>Resist\u00e8ncia a l&#8217;abrasi\u00f3:<\/strong> En condicions d&#8217;abrasi\u00f3, la granulometria de l&#8217;\u00e0rid \u00e9s determinant per arribar a resist\u00e8ncies a l&#8217;abrasi\u00f3 elevades. Resist\u00e8ncia a l&#8217;impacte: Segons la norma UNE EN 127748-1\/2006 Al\u00e7ada de trencament per bola d&#8217;acer 1 kg &gt; 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=\"hormigon-uhpc-alta-resistencia\" width=\"700\" height=\"500\" \/>  &nbsp; <\/p>\n<h4>Difer\u00e8ncies i factors en com\u00fa entre el Formig\u00f3 UHPC i el Formig\u00f3 GRC<\/h4>\n<p> https:\/\/www.youtube.com\/watch?v=MFRIaH2YKXQ  Bibliografia:\u00a0 <a href=\"https:\/\/www.architectonicconcretesl.com\" target=\"_blank\" rel=\"noopener\">Achitectonic Concrete SL<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u00c9s un tipus de formig\u00f3 de nova generaci\u00f3 que permet dissenyar i produir formes complexes de gran resist\u00e8ncia i, alhora, molt lleugeres i esveltes. Posseeix una elevada resist\u00e8ncia a la compressi\u00f3, a la flexi\u00f3 i al desgast, aix\u00ed com una gran durabilitat. \u00c9s un formig\u00f3 de consist\u00e8ncia fluida\/l\u00edquida que aconsegueix una baixa absorci\u00f3 d&#8217;aigua. Es fabrica amb fibres polim\u00e8riques, inorg\u00e0niques o met\u00e0l\u00b7liques i \u00e0rids silicis amb una mida m\u00e0xima d&#8217;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":[868],"tags":[1486,1487],"class_list":["post-23853","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>Formig\u00f3 d\u2019ultra-alta resist\u00e8ncia (UHPC). 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Posseeix una elevada resist\u00e8ncia a la compressi\u00f3, a la flexi\u00f3 i al desgast, aix\u00ed com una gran durabilitat. \u00c9s un formig\u00f3 de consist\u00e8ncia fluida\/l\u00edquida que aconsegueix una baixa absorci\u00f3 d&#039;aigua. 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