diplomska naloga
Nejc Andrejka (Author), Violeta Bokan-Bosiljkov (Mentor), Tomo Cerovšek (Thesis defence commission member), Sebastjan Bratina (Thesis defence commission member), Andraž Hočevar (Co-mentor)

Abstract

Vpliv mineralnih dodatkov na reološke lastnosti svežega betona

Keywords

gradbeništvo;diplomska dela;VSŠ;OG-MK;reologija;viskoznost;strižna napetost na meji tečenja;plastična viskoznost;posed;razlez;

Data

Language: Slovenian
Year of publishing:
Source: Ljubljana
Typology: 2.11 - Undergraduate Thesis
Organization: UL FGG - Faculty of Civil and Geodetic Engineering
Publisher: [N. Andrejka]
UDC: 666.97.031(043.2)
COBISS: 6029921 Link will open in a new window
Views: 2508
Downloads: 602
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Other data

Secondary language: English
Secondary title: Influence of mineral additives on rheological properties of fresh concrete
Secondary abstract: The purpose of the research was to examine the influence of mineral admixture on the rheological properties of fresh concrete mixtures. Rheological properties of fresh concrete mixtures were obtained in three ways, with well known methods slump test and flow table test and with yet fairly non-established coaxial cylindrical rheometer ConTec Viscometer 5. Rheometer is a better and modern way to detect such properties of fresh concrete. Recently the approach has become indispensable, due to growing demands for quality of cast concrete and for adequate design of self-compacting and highly-flowable concrete mixtures. Slump test and flow table test do not provide enough information about rheological properties for this kind of special concrete. We researched the impact of three mineral additives: micro silica, tuff and granulated blast furnace slag, as well as the impact of water-cement ratio, which is a key factor in concrete. We also researched the influence of super-plasticizer, because concrete needs to be in proper workability, which is necessary for proper measurements. We analyzed the influence of mineral admixtures on the rheological properties of concrete over time and their effect on mechanical properties according to their share in the concrete.
Secondary keywords: graduation thesis;civil engineering;rheology;plastic viscosity;yield value;slump;flow;
File type: application/pdf
Type (COBISS): Bachelor thesis/paper
Thesis comment: Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Pages: XII, 64 str.
Type (ePrints): thesis
Title (ePrints): Influence of mineral additives on rheological properties of fresh concrete
Keywords (ePrints): reologija;viskoznost;strižna napetost na meji tečenja;plastična viskoznost;posed;razlez
Keywords (ePrints, secondary language): rheology;plastic viscosity;yield value;slump;flow
Abstract (ePrints): Namen opravljenih preiskav je bil raziskati vpliv mineralnih dodatkov na reološke lastnosti svežih betonskih mešanic. Lastnosti svežih betonskih mešanic smo pridobili na tri načine, s klasičnima metodama preizkusa z razlezom in preizkusa s posedom ter s še dokaj neuveljavljenim koaksialnim valjastim reometrom ConTec Viscometer 5. Reometer predstavlja boljši in modernejši način za ugotavljanje lastnosti svežih betonov. To je v zadnjem času ob vse večjih zahtevah po kakovostni vgradnji betona ter ustreznem projektiranju samozgoščevalnih in lahkovgradljivih betonov nujno potrebno, saj uveljavljeni metodi razleza in poseda ne podata dovolj informacij. Obravnavali smo vpliv treh mineralnih dodatkov: mikrosilike, tufa in granulirane plavžne žlindre, poleg tega pa tudi vpliv vodo-cementnega razmerja, ki je ključni faktor v betonu in vpliv super-plastifikatorja, ker smo ga zaradi boljše obdelavnosti betona, ki je potrebna za ustrezno meritev dodali vsem mešanicam z mineralnimi dodatki. Analizirali smo vpliv mineralnih dodatkov na mehanske lastnosti sveže betonske mešanice po času ter njihov vpliv na reološke lastnosti glede na njihov delež v betonu.
Abstract (ePrints, secondary language): The purpose of the research was to examine the influence of mineral admixture on the rheological properties of fresh concrete mixtures. Rheological properties of fresh concrete mixtures were obtained in three ways, with well known methods slump test and flow table test and with yet fairly non-established coaxial cylindrical rheometer ConTec Viscometer 5. Rheometer is a better and modern way to detect such properties of fresh concrete. Recently the approach has become indispensable, due to growing demands for quality of cast concrete and for adequate design of self-compacting and highly-flowable concrete mixtures. Slump test and flow table test do not provide enough information about rheological properties for this kind of special concrete. We researched the impact of three mineral additives: micro silica, tuff and granulated blast furnace slag, as well as the impact of water-cement ratio, which is a key factor in concrete. We also researched the influence of super-plasticizer, because concrete needs to be in proper workability, which is necessary for proper measurements. We analyzed the influence of mineral admixtures on the rheological properties of concrete over time and their effect on mechanical properties according to their share in the concrete.
Keywords (ePrints, secondary language): rheology;plastic viscosity;yield value;slump;flow
ID: 8312545