"Mnoho chemick\u00FDch slou\u010Denin m\u00E1 vliv na zm\u011Bnu mechanismu hydrata\u010Dn\u00ED reakce cementu, av\u0161ak p\u0159esn\u00FD mechanismus velk\u00E9 \u0159ady reakc\u00ED t\u011Bchto slou\u010Denin s cementovou sm\u011Bs\u00ED nebyl dosud zcela objasn\u011Bn. L\u00E1tky, kter\u00E9 se ozna\u010Duj\u00ED jako chemick\u00E9 p\u0159\u00EDsady, reaguj\u00ED jak se slo\u017Ekami cementu, s hydratovan\u00FDmi sl\u00EDnkov\u00FDmi miner\u00E1ly, tak i s dal\u0161\u00EDmi produkty hydratace, r\u016Fzn\u011B tedy ovliv\u0148uj\u00ED fyzik\u00E1ln\u00ED, chemick\u00E9 i mechanick\u00E9 vlastnosti cementov\u00FDch sm\u011Bs\u00ED. P\u0159\u00EDsady zpomaluj\u00EDc\u00ED ovliv\u0148uj\u00ED hydrataci kalciumalumin\u00E1t\u016F, kter\u00E9 hraj\u00ED podstatnou roli v pr\u016Fb\u011Bhu prvn\u00EDch hodin hydrata\u010Dn\u00EDho procesu. Bylo provedeno stanoven\u00ED voln\u00FDch Ca2+ iont\u016F metodou vyvinutou na kated\u0159e fyziky v prvn\u00EDch 100 minut\u00E1ch hydratace cementov\u00E9 pasty a kalorimetrick\u00E9 m\u011B\u0159en\u00ED v prvn\u00EDch 150 minut\u00E1ch hydrata\u010Dn\u00ED reakce cementu pro cementovou pastu s p\u0159\u00EDdavkem sachar\u00F3zy p\u0159\u00EDsady a pro srovn\u00E1vac\u00ED vzorek cementov\u00E9 pasty bez t\u00E9to p\u0159\u00EDsady. Pro ob\u011B metody byla pou\u017Eita cementov\u00E1 pasta pro w/c =0,5, t= 25\u00B0C. V\u00FDsledn\u00E9 k\u0159ivky pro stanoven\u00ED Ca2+ iont\u016F i kalorimetrick\u00E9 m\u011B\u0159en\u00ED vykazuj\u00ED v\u00FDrazn\u00FD rozd\u00EDl, kter\u00FD je d\u016Fsledkem zpomalen\u00ED hydrata\u010Dn\u00ED reakce cementu p\u0159\u00EDdavkem sachar\u00F3zy." . . "8"^^ . . . "Effect of sucrose as a set-retarding admixture on setting of cement paste"@en . "Chemical admixtures are used to alter the course of cement hydration reactions and the properties of concrete. Many organic admixtures containing a HO-C-C=O group markedly increase the setting time of cement mixtures, and sugars form an important class of such compounds. The effect of sucrose on the early hydration of Portland cement paste by determining of Ca2+ ions and by calorimetry has been studied."@en . "2"^^ . . "Brno" . . "Brno" . . "Ho\u0161kov\u00E1, \u0160\u00E1rka" . "2012-01-26+01:00"^^ . . "Vysok\u00E9 u\u010Den\u00ED technick\u00E9 v Brn\u011B. Fakulta stavebn\u00ED" . . . "178123" . "21110" . "Vliv sachar\u00F3zy jako zpomaluj\u00EDc\u00ED p\u0159\u00EDsady na tuhnut\u00ED cementov\u00E9 pasty"@cs . "Vliv sachar\u00F3zy jako zpomaluj\u00EDc\u00ED p\u0159\u00EDsady na tuhnut\u00ED cementov\u00E9 pasty"@cs . "S" . . . "Effect of sucrose as a set-retarding admixture on setting of cement paste"@en . . "Vliv sachar\u00F3zy jako zpomaluj\u00EDc\u00ED p\u0159\u00EDsady na tuhnut\u00ED cementov\u00E9 pasty" . . "Vliv sachar\u00F3zy jako zpomaluj\u00EDc\u00ED p\u0159\u00EDsady na tuhnut\u00ED cementov\u00E9 pasty" . "Juniorstav 2012 - 14. odborn\u00ED konference doktorsk\u00E9ho studia" . . . . "978-80-214-4393-8" . "RIV/68407700:21110/12:00195135" . . . . "Mnoho chemick\u00FDch slou\u010Denin m\u00E1 vliv na zm\u011Bnu mechanismu hydrata\u010Dn\u00ED reakce cementu, av\u0161ak p\u0159esn\u00FD mechanismus velk\u00E9 \u0159ady reakc\u00ED t\u011Bchto slou\u010Denin s cementovou sm\u011Bs\u00ED nebyl dosud zcela objasn\u011Bn. L\u00E1tky, kter\u00E9 se ozna\u010Duj\u00ED jako chemick\u00E9 p\u0159\u00EDsady, reaguj\u00ED jak se slo\u017Ekami cementu, s hydratovan\u00FDmi sl\u00EDnkov\u00FDmi miner\u00E1ly, tak i s dal\u0161\u00EDmi produkty hydratace, r\u016Fzn\u011B tedy ovliv\u0148uj\u00ED fyzik\u00E1ln\u00ED, chemick\u00E9 i mechanick\u00E9 vlastnosti cementov\u00FDch sm\u011Bs\u00ED. P\u0159\u00EDsady zpomaluj\u00EDc\u00ED ovliv\u0148uj\u00ED hydrataci kalciumalumin\u00E1t\u016F, kter\u00E9 hraj\u00ED podstatnou roli v pr\u016Fb\u011Bhu prvn\u00EDch hodin hydrata\u010Dn\u00EDho procesu. Bylo provedeno stanoven\u00ED voln\u00FDch Ca2+ iont\u016F metodou vyvinutou na kated\u0159e fyziky v prvn\u00EDch 100 minut\u00E1ch hydratace cementov\u00E9 pasty a kalorimetrick\u00E9 m\u011B\u0159en\u00ED v prvn\u00EDch 150 minut\u00E1ch hydrata\u010Dn\u00ED reakce cementu pro cementovou pastu s p\u0159\u00EDdavkem sachar\u00F3zy p\u0159\u00EDsady a pro srovn\u00E1vac\u00ED vzorek cementov\u00E9 pasty bez t\u00E9to p\u0159\u00EDsady. Pro ob\u011B metody byla pou\u017Eita cementov\u00E1 pasta pro w/c =0,5, t= 25\u00B0C. V\u00FDsledn\u00E9 k\u0159ivky pro stanoven\u00ED Ca2+ iont\u016F i kalorimetrick\u00E9 m\u011B\u0159en\u00ED vykazuj\u00ED v\u00FDrazn\u00FD rozd\u00EDl, kter\u00FD je d\u016Fsledkem zpomalen\u00ED hydrata\u010Dn\u00ED reakce cementu p\u0159\u00EDdavkem sachar\u00F3zy."@cs . "[B88276A76D36]" . "RIV/68407700:21110/12:00195135!RIV13-MSM-21110___" . "Rollov\u00E1, Jitka" . "Hydrating cement paste; admixtures; retarders; sucrose; concentration of Ca2+ ions"@en . "2"^^ .