diplomska naloga
Jože Maver (Author), Violeta Bokan-Bosiljkov (Mentor), Tomo Cerovšek (Thesis defence commission member), Andraž Hočevar (Co-mentor)

Abstract

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

Keywords

gradbeništvo;diplomska naloga;VSŠ;reologija svežih cementnih mešanic;samozgoščevalni beton;vodocementno razmerje;polikarboksilatni superplastifikator;strižna napetost na meji tečenja;plastična viskoznost;razlez s posedom;koaksialni reometer;polifosfonatni superplastifikator,;

Data

Language: Slovenian
Year of publishing:
Source: Ljubljana
Typology: 2.11 - Undergraduate Thesis
Organization: UL FGG - Faculty of Civil and Geodetic Engineering
Publisher: [J. Maver]
UDC: 666.9:691.32(043.2)
COBISS: 6513505 Link will open in a new window
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Downloads: 769
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Other data

Secondary language: English
Secondary title: Rheology of fresh self-compacting concretes and mortars with the same specific surface of aggregate grains
Secondary abstract: 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.
Secondary keywords: 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;
File type: application/pdf
Type (COBISS): Undergraduate thesis
Thesis comment: Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Pages: XV, 69 str.
Type (ePrints): thesis
Title (ePrints): Reologija svežih samozgoščevalnih betonov in malt z enako razvito površino agregatnih zrn
Keywords (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
Keywords (ePrints, secondary language): Rheology of fresh cement mixtures;self-compacting concrete;water-to-cement ratio;polycaboxylate superplasticizer;polyphosphonate superplasticizer;yield value;plastic viscosity;slump-flow;coaxial rheometer
Abstract (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.
Abstract (ePrints, secondary language): 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.
Keywords (ePrints, secondary language): 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