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Vpliv vsebnosti recikliranega opečnega agregata na velikost avtogenega krčenja betona visoke trdnost : diplomska naloga
ID Debevec, Urban (Author), ID Saje, Drago (Mentor) More about this mentor... This link opens in a new window

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Abstract
Betoni visoke trdnosti imajo v primerjavi z betoni običajne trdnosti v splošnem nižje vodo-cementno razmerje, kar pomeni, da vsebujejo manj vode v sami mešanici in običajno več cementa. Manj vode in več cementa v mešanici betona sta razloga za večje krčenje, predvsem v zgodnjem obdobju strjevanja betona. Krčenje betona povzroča natezne napetosti, zaradi katerih lahko nastanejo razpoke, ki poslabšajo trajnost betonskih elementov. Z namenom znižanja velikosti krčenja smo v okviru diplomske naloge v betonsko mešanico poleg navadnega agregata vgradili tudi 12 % recikliranega agregata, pripravljenega iz opeke navadnega formata. Tega smo predhodno namočili v vodi. V okviru eksperimentalne raziskave smo izvedli meritve začetnega avtogenega krčenja betona visoke trdnosti na zatesnjenih preizkušancih in tlačni preizkus na betonskih kockah. Ugotovili smo, da predhodno namočen recikliran opečni agregat, razporejen po strukturi betona, nudi notranjo nego betonu visoke trdnosti in zmanjšuje zgodnje krčenje betona. Pri tem se je tudi nekoliko zmanjšala tlačna trdnost preiskovanega betona.

Language:Slovenian
Keywords:diplomske naloge, recikliran opečni agregat, visoko trdni beton, avtogeno krčenje betona, notranja nega betona
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FGG - Faculty of Civil and Geodetic Engineering
Place of publishing:Ljubljana
Publisher:[U. Debevec]
Year:2024
Number of pages:1 spletni vir (1 datoteka PDF (XVI, 35 str.))
PID:20.500.12556/RUL-164002-b3eb9c73-4648-9947-826a-f7f3ee6a2fc8 This link opens in a new window
UDC:691.3(043.2)
COBISS.SI-ID:211787523 This link opens in a new window
Publication date in RUL:15.10.2024
Views:161
Downloads:121
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Secondary language

Language:English
Title:The effect of recycled brick aggregate on the autogenous shrinkage of high-strength concrete : graduation thesis
Abstract:
High-strength concretes, compared to normal-strength concretes, generally have a lower water-cement ratio, which means that they contain less water in the mix itself and usually more cement. However, less water and more cement in the concrete mix are the reasons for higher shrinkage, especially during the early curing period of the concrete. Shrinkage of concrete causes tensile stresses which can lead to cracks that impair the durability of concrete elements. In the thesis, in order to reduce the magnitude of shrinkage, 12 % recycled aggregate made from common size bricks was incorporated in the concrete mix in addition to the normal aggregate. The aggregate was pre-soaked in water. As part of the experimental research, measurements of the initial autogenous shrinkage of the high-strength concrete were carried out on sealed test specimens and a compression test on concrete cubes. We found that pre soaked recycled brick aggregate distributed throughout the concrete structure provides internal curing to the high-strength concrete - reducing the early shrinkage of the concrete. At the same time, the compressive strength of the concrete tested was slightly reduced.

Keywords:graduation thesis, high-strength concrete, recycled brick aggregate, autogenous shrinkage of concrete, internal curing of concrete

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