"Buenos Aires" . . . "26110" . . . "Z(MSM0021630511)" . "2007-10-22+02:00"^^ . . . . . "9"^^ . "Gypsum free cements and concretes made with them: strength determination using nondestructive testing methods" . "Gypsum free cements and concretes made with them: strength determination using nondestructive testing methods"@en . . . "Zji\u0161\u0165ov\u00E1n\u00ED pevnost\u00ED bezs\u00E1drovcov\u00FDch cement\u016F a beton\u016F z nich vyroben\u00FDch s vyu\u017Eit\u00EDm nedestruktivn\u00EDch zku\u0161ebn\u00EDch metod"@cs . "1-9" . "Bezs\u00E1drovcov\u00FD cement (GFC -gypsum free cement) je pojivo na b\u00E1zi portlandsk\u00E9ho slinku ve kter\u00E9m je p\u0159\u00EDsada pro regulaci po\u010D\u00E1tku tuhnut\u00ED s\u00E1drovec nahrazena syst\u00E9mem lignosulfinanem alkalich\u00E9ho kovu a uhli\u010Ditanem alkalick\u00E9ho kovu. Toto pojivo se vyzna\u010Duje vysok\u00FDmi po\u010D\u00E1te\u010Dn\u00EDmi pevnostmi a rachl\u00FDm po\u010D\u00E1tkem tuhnut\u00ED, tyto vlastnosti se n\u00E1sledn\u011B p\u0159en\u00E1\u0161\u00ED i na betony vyroben\u00E9 s t\u00EDmto pojivem. V \u010Dl\u00E1nku je uvedena metodika a kalibra\u010Dn\u00ED vztahy jednak pro ur\u010Dov\u00E1n\u00ED pevnost\u00ED bezs\u00E1drovcov\u00FDch cement\u016F z rychlosti \u0161\u00ED\u0159en\u00ED ultrazvuku a jednak pro zji\u0161\u0165ov\u00E1n\u00ED pevnost\u00ED bet\u016F s bezs\u00E1drovcov\u00FDch cement\u016F s vyu\u017Eit\u00EDm tvrdom\u011Brn\u00E9 odrazov\u00E9 metody a ultrazvukov\u00E9 impulsov\u00E9 metody. Ultrazvukov\u00E1 impulsov\u00E1 metoda je vyu\u017Eiteln\u00E1 pro zji\u0161\u0165ov\u00E1n\u00ED pevnost\u00ED v tlaku GFC. Pro zji\u0161\u0165ov\u00E1n\u00ED pevnost\u00ED v tlaku beton\u016F s GFC jsou vyu\u017Eiteln\u00FD odrazov\u00E9 tvrdom\u011Bry (system Schmidt typ N a L - PROCEQ, \u0160v\u00FDcarsko), ultrazvukov\u00E1 metoda je vyu\u017Eiteln\u00E1 za p\u0159edpokladu nem\u011Bnn\u00FDch s"@cs . . . "Non-destructive testing, Cement, Concrete, Compression strength, Impact Hammer, Ultrasonic pulse velocity"@en . "2"^^ . . "Bro\u017Eovsk\u00FD, Ji\u0159\u00ED" . . "3"^^ . "RIV/00216305:26110/07:PU67855" . "Gypsum free cements and concretes made with them: strength determination using nondestructive testing methods"@en . "Gypsum free cements and concretes made with them: strength determination using nondestructive testing methods" . "Zji\u0161\u0165ov\u00E1n\u00ED pevnost\u00ED bezs\u00E1drovcov\u00FDch cement\u016F a beton\u016F z nich vyroben\u00FDch s vyu\u017Eit\u00EDm nedestruktivn\u00EDch zku\u0161ebn\u00EDch metod"@cs . "Gypsum free cement (GFC) is based on Portland clinker. Gypsum as an initial setting time regulation additive is replaced by a system based on lignosulfonane of alkali metal and carbonate of alkali metal. This binder features high initial strength and short initial setting time; subsequently, these properties continue in concretes made with this binding material. Concrete with gypsum-free cement is characterized with short setting time and high initial strength. Concrete with gypsum-free cement has comparable strength after 3 days of curing with a 28 days strength of common concrete with Portland cement containing gypsum. Our paper describes methodology and calibration relations for both - GFC strength determination through ultrasonic pulse velocity and strength determination of types of concrete made with GFC using ball thrust hardness test. The last-named method is applicable for GFC compression strength determination; and also for types concrete based on GFC, commendable are impact hammers (Schmidt"@en . "423746" . "978-987-23957-0-4" . "RIV/00216305:26110/07:PU67855!RIV08-MSM-26110___" . . "CD - PROSEDINGS IV Conferencia Panamericana de END" . . "Gypsum free cement (GFC) is based on Portland clinker. Gypsum as an initial setting time regulation additive is replaced by a system based on lignosulfonane of alkali metal and carbonate of alkali metal. This binder features high initial strength and short initial setting time; subsequently, these properties continue in concretes made with this binding material. Concrete with gypsum-free cement is characterized with short setting time and high initial strength. Concrete with gypsum-free cement has comparable strength after 3 days of curing with a 28 days strength of common concrete with Portland cement containing gypsum. Our paper describes methodology and calibration relations for both - GFC strength determination through ultrasonic pulse velocity and strength determination of types of concrete made with GFC using ball thrust hardness test. The last-named method is applicable for GFC compression strength determination; and also for types concrete based on GFC, commendable are impact hammers (Schmidt" . "Asociaci\u00F3n Argentina de Ensayos No Destructivos y Estructurales" . . . . "Zach, Ji\u0159\u00ED" . "Buenos Aires" . . "[20707CAECA5C]" .