{"id":278644,"date":"2021-08-27T12:54:10","date_gmt":"2021-08-27T12:54:10","guid":{"rendered":"https:\/\/www.sanier.pl\/bw-hasla\/gips\/"},"modified":"2025-03-03T10:25:15","modified_gmt":"2025-03-03T10:25:15","slug":"gips","status":"publish","type":"knowledgebase","link":"https:\/\/www.sanier.pl\/sk\/bw-hasla\/gips\/","title":{"rendered":"Sadra"},"content":{"rendered":"<p>[vc_row][vc_column][vc_column_text]<\/p>\n<h2 data-start=\"36\" data-end=\"55\"><strong data-start=\"36\" data-end=\"55\">\u010co je to sadra?<\/strong><\/h2>\n<p data-start=\"57\" data-end=\"414\">Stavebn\u00e1 sadra, z chemick\u00e9ho h\u013eadiska je polvodn\u00fd s\u00edran v\u00e1penat\u00fd CaSO4\u20220,5H2O, vyr\u00e1ban\u00fd procesom pra\u017eenia pr\u00edrodn\u00e9ho sadrov\u00e9ho kame\u0148a alebo technol\u00f3giou z\u00edskavania sadry z in\u0161tal\u00e1ci\u00ed na ods\u00edrovanie spal\u00edn v uho\u013en\u00fdch elektr\u00e1r\u0148ach. V stavebn\u00edctve sa pou\u017e\u00edva ako spojivo, na v\u00fdrobu cementu a \u010fal\u0161\u00edch v\u00fdrobkov. Je \u013eahko rezn\u00fd a dobre sa rozp\u00fa\u0161\u0165a v hor\u00facej vode.<\/p>\n<p data-start=\"416\" data-end=\"881\">Sadry, teda v\u00e1penat\u00e9 s\u00edrany, s\u00fa zn\u00e1me u\u017e tis\u00edce rokov. Vyskytuj\u00fa sa v pr\u00edrode ako horniny v podobe sadrov\u00e9ho kame\u0148a (jeho ve\u013emi \u010dist\u00e1 jemnozrnna odroda je alabaster) a anhydritu, ako aj produkty spa\u013eovania sadrov\u00e9ho kame\u0148a, teda sadrov\u00e9 spojiv\u00e1, v podobe hlavne polvodnej sadry a tzv. rozpustn\u00e9ho anhydritu. Sadrov\u00e9 spojiv\u00e1 s\u00fa chemicky akt\u00edvne. Po zmie\u0161an\u00ed s vodou r\u00fdchlo tuhn\u00fa, pri\u010dom vytv\u00e1raj\u00fa sadrov\u00fd materi\u00e1l so zlo\u017een\u00edm zodpovedaj\u00facim p\u00f4vodnej dvojvodnej sade.<\/p>\n<h3 data-start=\"883\" data-end=\"901\"><strong data-start=\"883\" data-end=\"901\">Pou\u017eitie sadry<\/strong><\/h3>\n<p data-start=\"903\" data-end=\"1273\">Sadra je nenahradite\u013en\u00e1 v kr\u00e1snych umeniach ako soch\u00e1rsky, modelovac\u00ed a dekorat\u00edvny materi\u00e1l, v chirurgii a stomatol\u00f3gii, v keramickom priemysle na v\u00fdrobu foriem. V minulosti a \u010dasto aj dnes sa sadra vyu\u017e\u00edva v chemickom priemysle (farby a laky), papierenskom priemysle, potravin\u00e1rstve (na \u010d\u00edrenie v\u00edna) a v po\u013enohospod\u00e1rstve (prostriedok na hnojenie a zlep\u0161ovanie p\u00f4dy).<\/p>\n<p data-start=\"1275\" data-end=\"1734\">Sadra sa pou\u017e\u00edva predov\u0161etk\u00fdm v stavebn\u00edctve a architekt\u00fare, \u010do je sp\u00f4soben\u00e9 okrem in\u00e9ho aj \u013eahkos\u0165ou tvarovania v\u00fdrobkov a ich povrchov. Je to ekologicky \u010dist\u00fd materi\u00e1l, zdrav\u00fd a poskytuj\u00faci spr\u00e1vne hygienick\u00e9 podmienky pre \u013eudsk\u00fd organizmus. Sadrov\u00e9 materi\u00e1ly spolu s v\u00e1pnom a keramikou patria k najstar\u0161\u00edm stavebn\u00fdm materi\u00e1lom vyroben\u00fdm \u010dlovekom. Viacero storo\u010d\u00ed sk\u00fasenost\u00ed uk\u00e1zalo, \u017ee sadra je ide\u00e1lny materi\u00e1l pre stavebn\u00edctvo, najm\u00e4 pre bytov\u00fa v\u00fdstavbu.<\/p>\n<h3 data-start=\"1736\" data-end=\"1756\"><strong data-start=\"1736\" data-end=\"1756\">Vlastnosti sadry<\/strong><\/h3>\n<ul data-start=\"1758\" data-end=\"2207\" data-is-only-node=\"\" data-is-last-node=\"\">\n<li data-start=\"1758\" data-end=\"1842\">kr\u00e1tky \u010das tuhnutia (nieko\u013eko min\u00fat), ktor\u00fd sa d\u00e1 \u013eahko upravi\u0165 vhodn\u00fdmi pr\u00edsadami<\/li>\n<li data-start=\"1843\" data-end=\"1916\">\u017eiadny smr\u0161tovac\u00ed efekt, ba dokonca ur\u010dit\u00fd n\u00e1rast objemu po\u010das tuhnutia<\/li>\n<li data-start=\"1917\" data-end=\"1957\">pomerne vysok\u00e1 pevnos\u0165 v tlaku a ohybe<\/li>\n<li data-start=\"1958\" data-end=\"1982\">oh\u0148ovzdorn\u00e9 vlastnosti<\/li>\n<li data-start=\"1983\" data-end=\"2153\">chemicky viazan\u00e1 voda v sadr\u00e1ch (pribli\u017ene 20% hmotnosti) sa pri teplot\u00e1ch nad 140 \u00b0C uvo\u013e\u0148uje vo forme pary, \u010do absorbuje zna\u010dn\u00e9 mno\u017estvo tepla, \u010d\u00edm ochladzuje povrchy<\/li>\n<li data-start=\"2154\" data-end=\"2207\" data-is-last-node=\"\">udr\u017eiava stabiln\u00fa vlhkos\u0165 vzduchu v ur\u010ditom rozsahu<\/li>\n<\/ul>\n<p>[\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n","protected":false},"author":1,"featured_media":280347,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"","categories":[875],"tags":[],"class_list":["post-278644","knowledgebase","type-knowledgebase","status-publish","has-post-thumbnail","hentry","category-baza-wiedzy-sk"],"_links":{"self":[{"href":"https:\/\/www.sanier.pl\/sk\/wp-json\/wp\/v2\/knowledgebase\/278644","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.sanier.pl\/sk\/wp-json\/wp\/v2\/knowledgebase"}],"about":[{"href":"https:\/\/www.sanier.pl\/sk\/wp-json\/wp\/v2\/types\/knowledgebase"}],"author":[{"embeddable":true,"href":"https:\/\/www.sanier.pl\/sk\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sanier.pl\/sk\/wp-json\/wp\/v2\/comments?post=278644"}],"version-history":[{"count":0,"href":"https:\/\/www.sanier.pl\/sk\/wp-json\/wp\/v2\/knowledgebase\/278644\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.sanier.pl\/sk\/wp-json\/wp\/v2\/media\/280347"}],"wp:attachment":[{"href":"https:\/\/www.sanier.pl\/sk\/wp-json\/wp\/v2\/media?parent=278644"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.sanier.pl\/sk\/wp-json\/wp\/v2\/categories?post=278644"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.sanier.pl\/sk\/wp-json\/wp\/v2\/tags?post=278644"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}