Reologija svežih samozgoščevalnih betonov in malt z enako razvito površino agregatnih zrn

Povzetek

Ključne besede

Podatki

Jezik:	Slovenski jezik
Leto izida:	2014
Izvor:	Ljubljana
Tipologija:	2.11 - Diplomsko delo
Organizacija:	UL FGG - Fakulteta za gradbeništvo in geodezijo
Založnik:	[J. Maver]
UDK:	666.9:691.32(043.2)
COBISS:	6513505
Št. ogledov:	3376
Št. prenosov:	769
Ocena:	0 (0 glasov)
Metapodatki:

Ostali podatki

Sekundarni jezik:	Angleški jezik
Sekundarni naslov:	Rheology of fresh self-compacting concretes and mortars with the same specific surface of aggregate grains
Sekundarni povzetek:	The thesis investigates the rheological properties and workability of fresh self consolidating concrete mixtures. The purpose of the study is to investigate the impact of inaccurate addition of water on the stability of concrete. Changes in the consistency of fresh concrete mixture were compared with the changes of rheological properties of fresh concrete mixture. The amount of water was added in four stages, relative to the reference mixture. All mixtures were composed of mineral aggregate, cement, water and admixtures - two liquid superplasticizers (based on polycaboxylate and polyphosphonate) and a powder thickener. Studies were preformed using the rheometer Contec Viscometer 5 and standard slump-flow test. The goal in our study was to keep the consistency of all fresh concrete mixtures in one consistency class. We also studied the same impact on the properties of fresh mortar mixtures formulated using CEM method. The results were correlated with compressive strength of the SCC and mortar samples after 7 and 28 days.
Sekundarne ključne besede:	graduation thesis;civil engineering;rheology of fresh cement mixtures;self-compacting concrete;water-to-cement ratio;polycaboxylate superplasticizer;polyphosphonate superplasticizer;yield value;plastic viscosity;slump-flow;coaxial rheometer;
Vrsta datoteke:	application/pdf
Vrsta dela (COBISS):	Diplomsko delo
Komentar na gradivo:	Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Strani:	XV, 69 str.
Vrsta dela (ePrints):	thesis
Naslov (ePrints):	Reologija svežih samozgoščevalnih betonov in malt z enako razvito površino agregatnih zrn
Ključne besede (ePrints):	Reologija svežih cementnih mešanic;samozgoščevalni beton;vodocementno razmerje;polikarboksilatni superplastifikator;polifosfonatni superplastifikator;strižna napetost na meji tečenja;plastična viskoznost;razlez s posedom;koaksialni reometer
Ključne besede (ePrints, sekundarni jezik):	Rheology of fresh cement mixtures;self-compacting concrete;water-to-cement ratio;polycaboxylate superplasticizer;polyphosphonate superplasticizer;yield value;plastic viscosity;slump-flow;coaxial rheometer
Povzetek (ePrints):	V sklopu diplomske naloge smo opravili preiskave reoloških lastnosti in obdelavnosti na svežih samozgoščevalnih betonih. Glavni namen raziskave je bil preučiti vpliv netočnega dodajanja vode na stabilnost betona. Spremembe v konsistenci svežega betona smo primerjali s spremembami reoloških lastnosti svežega betona. Količino vode smo spreminjali v štirih stopnjah glede na referenčno mešanico. Vse mešanice so bile sestavljene iz mineralnega agregata, cementa, vode in kemijskega dodatka ali dodatkov - dveh superplastifikatorjev v tekoči obliki (na polikarboksilatni in polifosfonatni osnovi) ter gostila v obliki prahu. Raziskave smo opravili s pomočjo reometra ConTec Viscometer 5 in standardne metode razleza s posedom. Cilj raziskave je bil obdržati konsistenco svežega betona v enem konsistenčnem razredu. Enako smo preverili vpliv na lastnosti sveže malte, ki je formulirana na podlagi betonske mešanice z uporabo CEM metode. Na koncu smo dobljene rezultate povezali tudi z rezultati tlačne trdnosti samo-zgoščevalega betona in malte pri starosti 7 in 28 dni.
Povzetek (ePrints, sekundarni jezik):	The thesis investigates the rheological properties and workability of fresh self consolidating concrete mixtures. The purpose of the study is to investigate the impact of inaccurate addition of water on the stability of concrete. Changes in the consistency of fresh concrete mixture were compared with the changes of rheological properties of fresh concrete mixture. The amount of water was added in four stages, relative to the reference mixture. All mixtures were composed of mineral aggregate, cement, water and admixtures - two liquid superplasticizers (based on polycaboxylate and polyphosphonate) and a powder thickener. Studies were preformed using the rheometer Contec Viscometer 5 and standard slump-flow test. The goal in our study was to keep the consistency of all fresh concrete mixtures in one consistency class. We also studied the same impact on the properties of fresh mortar mixtures formulated using CEM method. The results were correlated with compressive strength of the SCC and mortar samples after 7 and 28 days.
Ključne besede (ePrints, sekundarni jezik):	Rheology of fresh cement mixtures;self-compacting concrete;water-to-cement ratio;polycaboxylate superplasticizer;polyphosphonate superplasticizer;yield value;plastic viscosity;slump-flow;coaxial rheometer
ID:	8327179