{"id":44349,"date":"2025-01-23T07:08:07","date_gmt":"2025-01-23T06:08:07","guid":{"rendered":"https:\/\/betoff.eu\/?p=44349"},"modified":"2025-01-23T07:08:07","modified_gmt":"2025-01-23T06:08:07","slug":"beton-vyztuzeny-vlakny-se-stale-vice-prosazuje-ve-stavebnictvi","status":"publish","type":"post","link":"https:\/\/betoff.eu\/cs\/beton-vyztuzeny-vlakny-se-stale-vice-prosazuje-ve-stavebnictvi\/","title":{"rendered":"Beton vyztu\u017een\u00fd vl\u00e1kny se st\u00e1le v\u00edce prosazuje ve stavebnictv\u00ed"},"content":{"rendered":"\r\n

Beton vyztu\u017een\u00fd vl\u00e1kny. Pom\u011brn\u011b n\u00edzk\u00e1 pevnost um\u011bl\u00e9ho kamene v tahu byla ji\u017e n\u011bkolikr\u00e1t \u0159e\u0161ena v d\u0159\u00edv\u011bj\u0161\u00edch odborn\u00fdch prac\u00edch o betonu. C\u00edlem \u010detn\u00fdch pokus\u016f o \u00fapravu stavebn\u00edho materi\u00e1lu tak, aby byl lep\u0161\u00ed, je tuto slabinu co nejv\u00edce odstranit. To plat\u00ed i pro „beton vyztu\u017een\u00fd vl\u00e1kny“, kter\u00fd m\u00e1 mnohem vy\u0161\u0161\u00ed pevnost v tahu ne\u017e b\u011b\u017en\u00fd beton. M\u00e1 v\u0161ak i n\u011bkolik dal\u0161\u00edch v\u00fdhod.<\/p>\r\n\r\n\r\n\r\n

Proto\u017ee beton vyztu\u017een\u00fd vl\u00e1kny je zpevn\u011bn p\u0159\u00edsadami – obvykle ocel\u00ed nebo sklem – je m\u00e9n\u011b n\u00e1chyln\u00fd k poru\u0161en\u00ed ne\u017e b\u011b\u017en\u00fd beton. Stejn\u00fdm zp\u016fsobem lze zv\u00fd\u0161it pevnost \u017eelezobetonu. Odolnost proti nam\u00e1h\u00e1n\u00ed v tahu m\u00e1 samoz\u0159ejm\u011b sv\u00e9 meze. P\u0159i velmi vysok\u00e9m zat\u00ed\u017een\u00ed se nakonec objev\u00ed trhliny. Beton vyztu\u017een\u00fd vl\u00e1kny v\u0161ak st\u00e1le nab\u00edz\u00ed v\u00fdhody. Trhliny jsou \u010dasto u\u017e\u0161\u00ed ne\u017e u b\u011b\u017en\u00e9ho betonu, a proto jsou m\u00e9n\u011b nebezpe\u010dn\u00e9 pro stabilitu konstruk\u010dn\u00edho prvku.<\/p>\r\n\r\n\r\n\r\n

Abychom si vyjasnili p\u0159\u00edpadn\u00e9 nejasnosti, vl\u00e1kna slou\u017e\u00ed jako „mikrov\u00fdztu\u017e“, ale nenahrazuj\u00ed zcela tradi\u010dn\u00ed ocelovou v\u00fdztu\u017e ve vysoce zat\u00ed\u017een\u00fdch, nosn\u00fdch prvc\u00edch. M\u016f\u017eete je v\u0161ak roz\u0161\u00ed\u0159it. „\u010cist\u00fd“ vl\u00e1knobeton lze pou\u017e\u00edt i k v\u00fdrob\u011b m\u00e9n\u011b nam\u00e1han\u00fdch komponent.<\/p>\r\n\r\n\r\n\r\n

Je t\u0159eba poznamenat, \u017ee vl\u00e1knov\u00e1 v\u00fdztu\u017e zvy\u0161uje krom\u011b pevnosti v tahu tak\u00e9 pevnost betonu v tlaku a odolnost proti n\u00e1razu. Krom\u011b toho se zvy\u0161uje pru\u017enost stavebn\u00edho materi\u00e1lu. To umo\u017e\u0148uje v\u011bt\u0161\u00ed m\u00edru deformace bez po\u0161kozen\u00ed (zpevn\u011bn\u00e9!) hmoty.<\/p>\r\n\r\n\r\n\r\n

Beton vyztu\u017een\u00fd vl\u00e1kny. Vl\u00e1kna z oceli<\/h2>\r\n\r\n\r\n\r\n

Beton vyztu\u017een\u00fd vl\u00e1kny je relativn\u011b nov\u00fd, a\u010dkoli \u017eelezobeton m\u00e1 dlouhou historii, kter\u00e1 sah\u00e1 a\u017e do poloviny 19. stolet\u00ed. Jejich v\u00fdvoj se zintenzivnil a\u017e od 70. let 20. stolet\u00ed. P\u016fvodn\u011b se jednalo o betony s ocelov\u00fdmi vl\u00e1kny, kter\u00e9 jsou nyn\u00ed vyv\u00edjeny a vyu\u017e\u00edv\u00e1ny p\u0159edev\u0161\u00edm pro pr\u016fmyslov\u00e9 podlahy, v\u00fdstavbu tunel\u016f a st\u00e1le v\u011bt\u0161\u00ed mno\u017estv\u00ed betonov\u00fdch prefabrik\u00e1t\u016f.<\/p>\r\n\r\n\r\n\r\n

Za\u010dlen\u011bn\u00edm ocelov\u00fdch vl\u00e1ken se z b\u011b\u017en\u00e9ho betonu – kter\u00fd je pom\u011brn\u011b k\u0159ehk\u00fd – st\u00e1v\u00e1 v\u00fdrazn\u011b tvrd\u0161\u00ed kompozitn\u00ed materi\u00e1l. V z\u00e1vislosti na aplikaci jej lze pou\u017e\u00edt pouze jako dopln\u011bk nebo jako plnou n\u00e1hradu ocelov\u00e9 konstruk\u010dn\u00ed v\u00fdztu\u017ee. Krom\u011b ji\u017e uveden\u00fdch oblast\u00ed vyu\u017eit\u00ed se tato l\u00e1tka objevuje tak\u00e9 p\u0159i stavb\u011b silnic a v rostouc\u00ed m\u00ed\u0159e tak\u00e9 v bytov\u00e9 architektu\u0159e, kde se beton s ocelov\u00fdmi vl\u00e1kny pou\u017e\u00edv\u00e1 pro st\u011bny suter\u00e9n\u016f a podlahov\u00e9 desky. P\u0159i zpracov\u00e1n\u00ed je v\u00fdhodn\u00e9, pokud materi\u00e1l nahrazuje tradi\u010dn\u00ed v\u00fdztu\u017e, proto\u017ee beton\u00e1\u017e vy\u017eaduje m\u00e9n\u011b \u00fasil\u00ed ne\u017e instalace \u017eelezobetonu, proto\u017ee se pou\u017e\u00edv\u00e1 hotov\u00fd v\u00fdrobek.<\/p>\r\n\r\n\r\n\r\n

Nakonec to, kolik a jak\u00fdch ocelov\u00fdch vl\u00e1ken se do betonu vlo\u017e\u00ed, rozhodne o tom, jak velk\u00fd stabiliza\u010dn\u00ed \u00fa\u010dinek budou m\u00edt. Je t\u0159eba zd\u016fraznit, \u017ee extr\u00e9mn\u011b vysok\u00e1 koncentrace vl\u00e1ken m\u016f\u017ee v\u00e9st k probl\u00e9m\u016fm p\u0159i zpracov\u00e1n\u00ed, co\u017e zt\u011b\u017euje hutn\u011bn\u00ed a \u010derp\u00e1n\u00ed \u010derstv\u00e9ho betonu. V d\u016fsledku toho je t\u0159eba obsah vl\u00e1ken pe\u010dliv\u011b v\u00e1\u017eit. Pokud je v betonu p\u0159\u00edli\u0161 mnoho vl\u00e1ken, m\u016f\u017ee b\u00fdt obt\u00ed\u017en\u011bj\u0161\u00ed jej \u0159\u00e1dn\u011b zhutnit, co\u017e by mohlo zhor\u0161it pevnost, kterou jste zam\u00fd\u0161leli zv\u00fd\u0161it pomoc\u00ed p\u0159\u00edsad.<\/p>\r\n\r\n\r\n\r\n

Paradoxn\u011b ocelov\u00e1 vl\u00e1kna podstatn\u011b zhor\u0161uj\u00ed ji\u017e tak pom\u011brn\u011b \u0161patnou tepelnou izolaci betonu. To v\u0161ak nemus\u00ed b\u00fdt nev\u00fdhodou, proto\u017ee p\u0159inejmen\u0161\u00edm v p\u0159\u00edpad\u011b podlahov\u00e9ho vyt\u00e1p\u011bn\u00ed je \u010dasto preferov\u00e1na vysok\u00e1 tepeln\u00e1 vodivost, zejm\u00e9na v oblasti pot\u011bru.<\/p>\r\n\r\n\r\n\r\n

Beton vyztu\u017een\u00fd vl\u00e1kny. Sklen\u011bn\u00e1 vl\u00e1kna<\/h2>\r\n\r\n\r\n\r\n

Textiln\u00ed beton je term\u00edn, kter\u00fd se pou\u017e\u00edv\u00e1, kdy\u017e jsou do betonu p\u0159im\u00edch\u00e1ny kompletn\u00ed roho\u017ee ze sklen\u011bn\u00fdch vl\u00e1ken.<\/p>\r\n\r\n\r\n\r\n

Ji\u017e n\u011bkolik let roste tak\u00e9 obliba sklovl\u00e1knobetonu. N\u011bkter\u00e9 v\u00fdrobky se vyu\u017e\u00edvaj\u00ed p\u0159edev\u0161\u00edm pro b\u00edl\u00e9 vany a pot\u011bry a maj\u00ed velmi n\u00edzk\u00fd obsah vl\u00e1ken (m\u00e9n\u011b ne\u017e 0,4 objemov\u00fdch procent). Na rozd\u00edl od zbo\u017e\u00ed s relativn\u011b vysok\u00fdm obsahem vl\u00e1ken (a\u017e 5 % objemov\u00fdch) slou\u017e\u00ed vl\u00e1kna v betonu pouze ke zv\u00fd\u0161en\u00ed jeho vodot\u011bsnosti a nepln\u00ed t\u00e9m\u011b\u0159 \u017e\u00e1dn\u00fd zpev\u0148uj\u00edc\u00ed \u00fa\u010del. Jejich hlavn\u00ed vyu\u017eit\u00ed spo\u010d\u00edv\u00e1 ve vytv\u00e1\u0159en\u00ed drobn\u00fdch, jemn\u011b tvarovan\u00fdch betonov\u00fdch d\u00edlc\u016f, kter\u00e9 jsou p\u0159esto neuv\u011b\u0159iteln\u011b stabiln\u00ed. Sklen\u011bn\u00e1 vl\u00e1kna nerezav\u00ed, a proto nen\u00ed pot\u0159eba minim\u00e1ln\u00ed vrstva betonu, kter\u00e1 by kov chr\u00e1nila, na rozd\u00edl od betonu, kter\u00fd obsahuje ocelov\u00e1 nebo ocelov\u00e1 vl\u00e1kna. P\u0159\u00edpadn\u011b je mo\u017en\u00e9 vytvo\u0159it komponenty, kter\u00e9 jsou siln\u00e9 jen n\u011bkolik milimetr\u016f.<\/p>\r\n\r\n\r\n\r\n

Koncept „textiln\u00edho betonu“ je nov\u011bj\u0161\u00ed. Tvo\u0159\u00ed jej sp\u00ed\u0161e spojen\u00e9 roho\u017ee ze sklen\u011bn\u00fdch vl\u00e1ken ne\u017e jednotliv\u00e1 sklen\u011bn\u00e1 vl\u00e1kna. T\u00edm se krom\u011b pevnosti v tahu v\u00fdrazn\u011b zvy\u0161uje i nosnost. Nap\u0159\u00edklad testy proveden\u00e9 na Technick\u00e9 univerzit\u011b v Dr\u00e1\u017e\u010fanech prok\u00e1zaly, \u017ee p\u0159id\u00e1n\u00edm dal\u0161\u00ed vrstvy betonu vyztu\u017een\u00e9ho tkaninou lze zv\u00fd\u0161it nosnost \u017eelezobetonov\u00fdch d\u00edlc\u016f a\u017e o 125 %.<\/p>\r\n\r\n\r\n\r\n

Textiln\u00ed beton m\u00e1 pozoruhodnou stabilitu i p\u0159i absenci tradi\u010dn\u00ed ocelov\u00e9 v\u00fdztu\u017ee. Jako p\u0159\u00edklad mohou slou\u017eit konstrukce, jako je prvn\u00ed p\u011b\u0161\u00ed most vyztu\u017een\u00fd tkaninou na sv\u011bt\u011b, kter\u00fd m\u011bl premi\u00e9ru v roce 2006 na St\u00e1tn\u00ed zahradnick\u00e9 v\u00fdstav\u011b v sask\u00e9m Oschatzu (viz foto). Tento most v\u00e1\u017e\u00ed celkem pouh\u00fdch p\u011bt tun a m\u00e1 tlou\u0161\u0165ku pouh\u00e9 t\u0159i centimetry. Most s podobnou v\u00fdztu\u017e\u00ed z betonu by v\u00e1\u017eil asi 25 tun.<\/p>\r\n\r\n\r\n\r\n

Beton vyztu\u017een\u00fd vl\u00e1kny. Vl\u00e1kna z plastu<\/h2>\r\n\r\n\r\n\r\n

Existuj\u00ed i dal\u0161\u00ed mo\u017enosti vyu\u017eit\u00ed betonu vyztu\u017een\u00e9ho syntetick\u00fdmi vl\u00e1kny, i kdy\u017e jsou pon\u011bkud omezen\u00e9. Po\u017e\u00e1rn\u00ed odolnost \u017eelezobetonu se d\u00e1le zvy\u0161uje pou\u017eit\u00edm polypropylenu. V p\u0159\u00edpad\u011b po\u017e\u00e1ru plast ho\u0159\u00ed a zanech\u00e1v\u00e1 za sebou drobn\u00e9 kan\u00e1lky, kter\u00fdmi funguje. To usnad\u0148uje \u00fanik vodn\u00edch par, kter\u00e9 se v betonu b\u011bhem po\u017e\u00e1ru hromad\u00ed, a oddaluje rychlost odlupov\u00e1n\u00ed povrchu prvku. To znamen\u00e1 del\u0161\u00ed dobu po\u017e\u00e1rn\u00ed ochrany ocelov\u00e9 v\u00fdztu\u017ee. D\u00edky polypropylenov\u00fdm vl\u00e1kn\u016fm vznik\u00e1 p\u0159i tvrdnut\u00ed \u010derstv\u011b polo\u017een\u00e9ho betonu m\u00e9n\u011b trhlin. Tuto vlastnost si obl\u00edbila zejm\u00e9na semena. Nicm\u00e9n\u011b plastov\u00e1 vl\u00e1kna ve ztvrdl\u00e9m betonu nemaj\u00ed v podstat\u011b \u017e\u00e1dn\u00fd vliv na pevnost materi\u00e1lu v tahu a tlaku.<\/p>\r\n\r\n\r\n\r\n

Materi\u00e1ly na b\u00e1zi uhl\u00edku<\/h2>\r\n\r\n\r\n\r\n

Beton vyztu\u017een\u00fd uhl\u00edkov\u00fdmi vl\u00e1kny se na trhu objevil tak\u00e9 teprve ned\u00e1vno. Ozna\u010duj\u00ed se tak\u00e9 jako uhl\u00edkov\u00e1 vl\u00e1kna a jejich hlavn\u00ed vyu\u017eit\u00ed bylo doposud v plastech vyztu\u017een\u00fdch vl\u00e1kny pro leteck\u00fd a automobilov\u00fd pr\u016fmysl a sportovn\u00ed vybaven\u00ed. Budouc\u00ed vyu\u017eit\u00ed v\u00fdjime\u010dn\u00e9 pevnosti a n\u00edzk\u00e9 hmotnosti uhl\u00edkov\u00fdch vl\u00e1ken v kombinaci s jejich velkou flexibilitou by se m\u011blo roz\u0161\u00ed\u0159it i na betonov\u00e9 v\u00fdrobky.<\/p>\r\n\r\n\r\n\r\n

Podle informac\u00ed v\u00fdrobce SGL Group by tento materi\u00e1l, kter\u00fd byl d\u0159\u00edve mimo\u0159\u00e1dn\u011b drah\u00fd, mohl \u010dasem dokonce nahradit d\u0159\u00edv\u011bj\u0161\u00ed \u017eelezobeton. D\u00edky v\u00fdvoji tenkost\u011bnn\u00fdch betonov\u00fdch konstrukc\u00ed s odolnost\u00ed proti korozi by byly a\u017e o 75 % leh\u010d\u00ed, pru\u017en\u011bj\u0161\u00ed a p\u0159inejmen\u0161\u00edm stejn\u011b pevn\u00e9 jako \u017eelezobeton. Mo\u017en\u00e1 v\u00e1s tedy zaj\u00edm\u00e1, zda v p\u0159\u00ed\u0161t\u00edch letech \u010di desetilet\u00edch p\u0159evl\u00e1dne tento nov\u00fd v\u00fdvoj v historicky pom\u011brn\u011b konzervativn\u00edm stavebnictv\u00ed.<\/p>\r\n\r\n\r\n\r\n

\u010ci\u0161t\u011bn\u00ed betonu vyztu\u017een\u00e9ho vl\u00e1kny<\/h2>\r\n\r\n\r\n\r\n

Na\u0161e \u010distic\u00ed prost\u0159edky, jako je nap\u0159\u00edklad tekut\u00fd BETOFF-B<\/a>, jsou ur\u010deny nejen k \u010di\u0161t\u011bn\u00ed<\/a> b\u011b\u017en\u00e9ho betonu, ale tak\u00e9 \u017eelezobetonu. Sta\u010d\u00ed nan\u00e9st kapalinu na zne\u010di\u0161t\u011bn\u00fd beton, po\u010dkat asi 10 minut a pot\u00e9 pomoc\u00ed kart\u00e1\u010de s m\u011bkk\u00fdmi \u0161t\u011btinami nan\u00e9st kapalinu na ne\u010distoty. Nakonec<\/a> v\u0161e smyjte vodou a beton je op\u011bt \u010dist\u00fd!<\/p>\r\n\r\n\r\n\r\n

\"Beton<\/figure>\r\n\r\n\r\n\r\n

Jak rozpustit beton vyztu\u017een\u00fd vl\u00e1kny?<\/h2>\r\n\r\n\r\n\r\n

N\u00e1\u0161 nejsiln\u011bj\u0161\u00ed prost\u0159edek na rozpou\u0161t\u011bn\u00ed betonu dok\u00e1\u017ee rozpustit jak\u00fdkoli typ betonu, v\u010detn\u011b \u017eelezobetonu. Pokud v\u00e1m z\u00e1le\u017e\u00ed na pevnosti a \u00fa\u010dinnosti<\/a>, kupte si BETOFF<\/a> liquid (koncentr\u00e1t<\/a>).<\/p>\r\n\r\n\r\n\r\n

\"vl\u00e1kny\"<\/figure>\r\n\r\n\r\n","protected":false},"excerpt":{"rendered":"

Beton vyztu\u017een\u00fd vl\u00e1kny. Pom\u011brn\u011b n\u00edzk\u00e1 pevnost um\u011bl\u00e9ho kamene v tahu byla ji\u017e n\u011bkolikr\u00e1t \u0159e\u0161ena v d\u0159\u00edv\u011bj\u0161\u00edch odborn\u00fdch prac\u00edch o betonu. C\u00edlem \u010detn\u00fdch pokus\u016f o \u00fapravu stavebn\u00edho materi\u00e1lu tak, aby byl lep\u0161\u00ed, je tuto slabinu co nejv\u00edce odstranit. To plat\u00ed i pro „beton vyztu\u017een\u00fd vl\u00e1kny“, kter\u00fd m\u00e1 mnohem vy\u0161\u0161\u00ed pevnost v tahu ne\u017e b\u011b\u017en\u00fd beton. M\u00e1 […]\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"footnotes":""},"categories":[570],"tags":[],"class_list":["post-44349","post","type-post","status-publish","format-standard","hentry","category-news-5"],"yoast_head":"\nBeton vyztu\u017een\u00fd vl\u00e1kny se st\u00e1le v\u00edce prosazuje ve stavebnictv\u00ed - BETOFF-Produkty pro sv\u011bt betonu i mimo n\u011bj!<\/title>\n<meta name=\"description\" content=\"Beton vyztu\u017een\u00fd vl\u00e1kny. \u010co s\u00fa to vl\u00e1kna na vystu\u017eenie bet\u00f3nu? Ako \u010disti\u0165 bet\u00f3n? Akou tekutinou rozp\u00fa\u0161\u0165a\u0165 bet\u00f3n? 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