Na prv\u00fd poh\u013ead to znie ako jeden z t\u00fdch typick\u00fdch \u201elife hackov\u201c, ktor\u00e9 vid\u00edte v pochybn\u00fdch internetov\u00fdch vide\u00e1ch, ale v skuto\u010dnosti sa za t\u00fdm skr\u00fdva poriadna ch\u00e9mia na stavenisku. In\u017einieri a odborn\u00edci na bet\u00f3n pou\u017e\u00edvaj\u00fa cukor ako druh \u201en\u00fadzovej brzdy\u201c.<\/p>\n\n\n\n
D\u00f4vod je rovnako jednoduch\u00fd ako d\u00f4myseln\u00fd: Cukor je jedn\u00fdm z najsilnej\u0161\u00edch spoma\u013eova\u010dov tuhnutia bet\u00f3nu.<\/p>\n\n\n\n
Tu je tajomstvo, pre\u010do a kedy profesion\u00e1li h\u00e1d\u017eu cukor do mie\u0161a\u010dky:<\/p>\n\n\n\n
D\u00f4sledok: Aj mal\u00e9 mno\u017estvo cukru (pribli\u017ene 0,1 a\u017e 0,2 % hmotnosti cementu) nar\u00fa\u0161a kry\u0161taliz\u00e1ciu silik\u00e1tov v cemente.<\/p>\n\n\n\n
V\u00fdsledok: Chemick\u00e1 reakcia sa zastav\u00ed alebo v\u00fdrazne spomal\u00ed. Bet\u00f3n zost\u00e1va tekut\u00fd, k\u00fdm n\u00e1kladn\u00e9 auto nedoraz\u00ed na stavenisko alebo k\u00fdm ho nie je mo\u017en\u00e9 bezpe\u010dne vy\u010disti\u0165.<\/p>\n\n\n\n
Debnenie je potiahnut\u00e9 pastou na b\u00e1ze cukru.<\/p>\n\n\n\n
Tam, kde sa bet\u00f3n dot\u00fdka cukru, na povrchu nestvrdne.<\/p>\n\n\n\n
Po odformovan\u00ed sa zvy\u0161n\u00e9 m\u00e4kk\u00e9 zvy\u0161ky cementu daj\u00fa jednoducho odstr\u00e1ni\u0165 tlakov\u00fdm \u010disti\u010dom a kamienky s\u00fa dokonale odhalen\u00e9.<\/p>\n\n\n\n
M\u00e1lo cukru: Od\u010fa\u013euje tvrdnutie o nieko\u013eko hod\u00edn (ide\u00e1lne v extr\u00e9mnych hor\u00fa\u010dav\u00e1ch).<\/p>\n\n\n\n
Pr\u00edli\u0161 ve\u013ea cukru: Bet\u00f3n nikdy nestvrdne. Zost\u00e1va drobiv\u00e1, pieso\u010dnat\u00e1 hmota, ktor\u00e1 neunesie \u017eiadnu z\u00e1\u0165a\u017e. V hist\u00f3rii stavebn\u00edctva sa dokonca vyskytli pr\u00edpady sabot\u00e1\u017ee, ke\u010f sa cukor primie\u0161aval do z\u00e1kladov, aby sa budovy stali nestabiln\u00fdmi.<\/p>\n\n\n\n
\u010co sa deje chemicky?<\/p>\n\n\n\n
Molekuly cukru sa prichytia na drobn\u00e9 \u010dastice cementu a vytvoria ochrann\u00fa vrstvu. T\u00e1to vrstva zabra\u0148uje vode dosta\u0165 sa k jadru \u010dastice. Bez vody nedoch\u00e1dza k hydrat\u00e1cii \u2013 bet\u00f3n \u201esp\u00ed\u201c.<\/p>\n\n\n\n
Varovanie pre dom\u00e1cich majstrov: Nikdy nepou\u017e\u00edvajte tento trik na nosn\u00e9 prvky (ako s\u00fa preklady alebo z\u00e1klady), pokia\u013e presne neviete, ko\u013eko cukru pou\u017e\u00edvate. Jedna \u010dajov\u00e1 ly\u017ei\u010dka prive\u013ea a v\u00e1\u0161 projekt z\u00e1hradn\u00e9ho m\u00faru sa zmen\u00ed na trval\u00e9 pieskovisko.<\/p>\n\n\n\n
Pl\u00e1novali ste s t\u00fdmto za\u010da\u0165 svojpomocne, alebo ste boli jednoducho zvedav\u00ed na zvl\u00e1\u0161tne tipy, ktor\u00e9 po\u010dujete na stavb\u00e1ch?<\/p>\n","protected":false},"excerpt":{"rendered":"
Na prv\u00fd poh\u013ead to znie ako jeden z t\u00fdch typick\u00fdch \u201elife hackov\u201c, ktor\u00e9 vid\u00edte v pochybn\u00fdch internetov\u00fdch vide\u00e1ch, ale v skuto\u010dnosti sa za t\u00fdm skr\u00fdva poriadna ch\u00e9mia na stavenisku. In\u017einieri […]<\/p>\n","protected":false},"author":2,"featured_media":2748,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-2747","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-zivotne-triky"],"_links":{"self":[{"href":"https:\/\/www.sk-babickinerady.top\/index.php?rest_route=\/wp\/v2\/posts\/2747"}],"collection":[{"href":"https:\/\/www.sk-babickinerady.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.sk-babickinerady.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.sk-babickinerady.top\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sk-babickinerady.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2747"}],"version-history":[{"count":1,"href":"https:\/\/www.sk-babickinerady.top\/index.php?rest_route=\/wp\/v2\/posts\/2747\/revisions"}],"predecessor-version":[{"id":2749,"href":"https:\/\/www.sk-babickinerady.top\/index.php?rest_route=\/wp\/v2\/posts\/2747\/revisions\/2749"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.sk-babickinerady.top\/index.php?rest_route=\/wp\/v2\/media\/2748"}],"wp:attachment":[{"href":"https:\/\/www.sk-babickinerady.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2747"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.sk-babickinerady.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2747"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.sk-babickinerady.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2747"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}