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Razvoj lahkoagregatnega samozgoščevalnega betona z deklariranimi lastnostmi : magistrsko delo
Klopčič, Jure (Author), Bokan-Bosiljkov, Violeta (Mentor) More about this mentor... This link opens in a new window, Sobočan, Štefan (Co-mentor)

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Abstract
V magistrski nalogi smo se ukvarjali z razvojem samozgoščevalnega betona iz lahkega agregata s predpisanimi lastnostmi, kot sta razred tlačne trdnosti in največja ciljna gostota betona. Pri določanju samozgoščevalnih lastnosti smo kot osnovno orodje uporabili meritve reoloških lastnosti in izbiro optimalnega območja napetosti na meji tečenja in plastične viskoznosti. V prvem delu naloge prikazujemo lastnosti in specifikacije lahkega agregata in lahkoagregatnega betona. Te podatke smo pridobili na podlagi pregledane strokovne literature in standardov. V tem delu podajamo še nekatere splošne razlage o reologiji betona in modelih za opis tekočin ter predstavimo meritve z ultrazvokom in meritve toplotnega toka. Drugi del naloge, ki predstavlja jedro naloge, je obširnejši in je naravnan eksperimentalno. Najprej so prikazane preskusne metode in načini izvajanja preiskav ter izmerjene lastnosti materiala. Sledi analiza rezultatov meritev. Betonske mešanice smo razdelili v dve skupini. Najprej smo obravnavali preliminarne mešanice, ki so služile kot priprava za glavno skupino mešanic. Pri glavni skupini mešanic smo analizirali vpliv različnih parametrov na reološke lastnosti svežih cementnih kompozitov, kar prikazujemo z reografi. Nato smo izbrano betonsko mešanico vgradili v steno dimenzij 100 cm x 230cm x 6 cm. Homogenost vgrajenega betona smo ocenili z meritvami z ultrazvokom, njegovo izolativnost pa z meritvami toplotnega toka. Preiskave so bile opravljene v okviru sodelovanja s podjetjem, ki uporablja takšne betone v praksi.

Language:Slovenian
Keywords:gradbeništvo, magistrska dela, samozgoščevalni lahkoagregatni beton, reologija, plastična viskoznost, napetost na meji tečenja, tlačna trdnost, prostorninska masa
Work type:Master's thesis/paper (mb22)
Tipology:2.09 - Master's Thesis
Organization:FGG - Faculty of Civil and Geodetic Engineering
Year:2015
Publisher:[J. Klopčič]
Number of pages:XVIII, 84 str.
Place:Ljubljana
COBISS.SI-ID:7323489  Link is opened in a new window
Views:701
Downloads:202
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Secondary language

Language:English
Title:Development of lightweight self-compacting concrete with declared properties
Abstract:
The aim of the master thesis was to develop lightweight self-compacting concrete made of lightweight aggregate and with declared properties, such as compressive strength class and maximal target density. Self-compacting properties were determined by measuring rheological properties and selecting the optimum range of yield stresses and plastic viscosities as a result of these measurements. In the first part of the thesis properties and specifications of lightweight aggregate and lightweight concrete are given. The data were obtained using relevant literature and standards. Common explanations about rheology of concrete and models for the description of liquids are also given, along with presentation of ultrasound testing and thermal current measurements. The second part of the thesis, which is experimental, represents the main part of my work. First the used test methods are given and the testing protocols are described, with obtained results of the tests. After that the test results are analysed. Concrete mixtures were divided in two groups. Preliminary concrete mixtures were first tested in order to define the composition of the main group of the mixtures. For the main mixtures rheological properties were first measured for different influencing parameters and presented in the form of rheographs. Then selected mixture was used to cast a concrete wall of 100 cm x 230 cm x 6 cm. The homogeneity of concrete in the wall was evaluated using ultrasound testing. The thermal insulation properties of the concrete were evaluated using thermal flow measurements. The study was carried out in the framework of cooperation with an enterprise that uses such concretes in practice.

Keywords:civil engineering, master of science thesis, lightweight self-compacting concrete, rheology, plastic viscosity, yield stress, compressive strength, density

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