diplomska naloga
Leon Mačak (Author), Drago Saje (Mentor)

Abstract

V diplomskem delu smo obravnavali vpliv notranje nege na tlačno trdnost betona visoke trdnosti. Betoni visoke trdnosti imajo višjo tlačno trdnost kot običajni betoni, zato lahko elementi iz omenjenih betonov, v primerjavi z elementi iz običajnega betona, enako obtežbo pri manjšem prečnem prerezu elementa. Ker pa visoko tlačno trdnost zagotavljamo predvsem z nizkim vodo-cementnim razmerjem, so ti betoni podvrženi večjemu krčenju in posledično razpokam. Deformacijo krčenja v zgodnjem obdobju lahko močno omilimo z notranjim negovanjem betona, s pomočjo notranjih rezervoarjev vode, kar pa lahko negativno vpliva na tlačno trdnost betona. Izvedli smo eksperimentalno raziskavo, v okviru katere smo testirali in analizirali vpliv različnih notranjih rezervoarje vode v betonih na velikost njihove tlačne trdnosti. Kot notranji rezervoar vode smo uporabili predhodno namočen naraven lahek agregat lehnjak, predhodno namočen umeten lahek agregat, s komercialnim imenom Liapor, predhodno namočena bazaltna vlakna, predhodno namočena celulozna vlakna. Notranje rezervoarje vode v beton vgradimo tako, da del običajnega agregata zamenjamo s predhodno namočenim medijem. Ugotovili smo, da je predhodno namočen lahek agregat, naraven in umeten, omogočil betonu višjo tlačno trdnost glede na primerjalni beton brez lahkega agregata, vgradnji predhodno namočenih bazaltnih in predhodno namočenih celuloznih vlaken pa sta na tlačno trdnost betona vplivali negativno.

Keywords

gradbeništvo;diplomska naloga;UNI;B-GR;tlačna trdnost;notranja nega;bazaltna vlakna;celulozna vlakna;lahki agregat;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL FGG - Faculty of Civil and Geodetic Engineering
Publisher: L. Mačak]
UDC: 539.411:691.32(043.2)
COBISS: 8977761 Link will open in a new window
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Downloads: 226
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Other data

Secondary language: English
Secondary title: The influence of internal curing on the compressive strength of high strength concrete
Secondary abstract: In this thesis the influence of internal curing on the compressive strength of high strength concrete was examined. Such concretes have much higher compressive strength than conventional concretes, so they can withstand the same load with a smaller cross-section of the element. However, since the high compressive strength is ensured primarily by the low water-cement ratio, these concretes are subject to greater shrinkage and consequently, cracks. Early shrinkage deformation can be greatly alleviated by the internal curing of the concrete, by means of internal water reservoirs, which in turn may adversely affect the compressive strength of the concrete. An experimental study was conducted in which the phenomenon of internal reservoirs in high strength concrete was tested and analyzed. As an internal water reservoir we used pre-soaked natural tufa aggregate, pre-soaked artificial lightweight Liapor aggregate, pre-soaked basalt fibers and pre-soaked cellulose fibers. Internal water reservoirs were placed in concrete by replacing part of a conventional unit with a pre-soaked medium. We found that pre-soaked lightweight aggregate, natural and artificial, gave concrete a higher compressive strength compared to non-lightweight aggregate concrete, and placement of pre-soaked basalt and presoaked cellulose fibers had a negative effect on the compressive strength of concrete.
Secondary keywords: civil engineering;graduation thesis;compressive strenght;internal curing;basalt fibers;cellulose fibers;lightweight aggregate;
Type (COBISS): Bachelor thesis/paper
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Pages: VII, 30 str.
ID: 11270678