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Avtogeno krčenje, posebnost betonov visoke trdnosti : diplomska naloga
Vogrič, Nina (Author), Saje, Drago (Mentor) More about this mentor... This link opens in a new window, Sinur, Franc (Thesis defence commission member), Bratina, Sebastjan (Thesis defence commission member)

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Abstract
Avtogeno krčenje je posledica samoizsuševanja v porah cementnega kamna in je pri betonih visoke trdnosti znatno večje kot pri betonih običajne trdnosti, predvsem zaradi nizkega vodo cementnega razmerja betonov visoke trdnosti. V diplomski nalogi smo preučili glavne mehanizme, ki povzročajo avtogeno krčenje. Le to lahko zmanjšamo z ustrezno notranjo nego – notranjimi rezervoarji vode. Kot notranje rezervoarje vode smo uporabili predhodno namočeno ekspandirano glino Liapor. Na preizkušancih iz betona, pri katerem smo 12 % običajnega agregata nadomestili s predhodno namočeno ekspandirano glino, smo merili krčenje in tlačno trdnost. Rezultate smo primerjali s predhodno opravljenimi preizkusi na primerljivih betonih visoke trdnosti brez in s predhodno namočenim lahkim agregatom Lehnjak. Ugotovili smo, da predhodno namočena ekspandirana glina frakcije 2 - 4 mm, v betonih visoke trdnosti, ugodno vpliva na velikost avtogenega krčenja betona in neugodno na velikost njegove tlačne trdnosti.

Language:Slovenian
Keywords:diplomska naloga, UNI-B, gradbeništvo, avtogeno krčenje, betoni visoke trdnosti, notanja nega betona, ekspandirana glina, hidratacijska reackija
Work type:Bachelor thesis/paper (mb11)
Tipology:2.11 - Undergraduate Thesis
Organization:FGG - Faculty of Civil and Geodetic Engineering
Year:2014
Publisher:[N. Vogrič]
Number of pages:IX, 32 str.
Place:Ljubljana
UDC:691.32(043.2)
COBISS.SI-ID:6654305 This link opens in a new window
Views:1843
Downloads:470
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Secondary language

Language:English
Title:Autogenous shrinkage, speciality of high performance concrete
Abstract:
Autogenous shrinkage is a consequence of self dessication in pores of hardened cement paste and is, at high performance concrete significantly greater than that of the ordinary concretes, mainly due to low water to cement ratio. In the graduation thesis we examined the main mechanisms that cause autogenous shrinkage. It can be reduced by internal curinginternal water reservoirs. As internal water reservoirs we used pre-soaked expanded clay Liapor. On specimens, in which we replaced 12 % of aggregate with pre-soaked expanded clay, we measured shrinkage and compressive strength. The results were compared with previously performed tests on high performance concrete without additives and on high performance concrete with addition of pre-soaked lightweight aggregate Lehnjak. We concluded that content of pre-soaked expanded clay has positive effect on shrinkage, but negative effect on the compressive strength.

Keywords:graduation thesis, civil engineering, autogenous shrinkage, high performance concretes, internal curing of concretes, expanded clay, hydration reaction

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