20.500.12556/RUL-164002 Vpliv vsebnosti recikliranega opečnega agregata na velikost avtogenega krčenja betona visoke trdnost diplomska naloga The effect of recycled brick aggregate on the autogenous shrinkage of high-strength concrete graduation thesis 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. 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. diplomske naloge recikliran opečni agregat visoko trdni beton avtogeno krčenje betona notranja nega betona graduation thesis high-strength concrete recycled brick aggregate autogenous shrinkage of concrete internal curing of concrete true false false [U. Debevec] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2024-10-15 12:57:51 2024-10-15 12:57:57 2025-08-08 13:42:52 0000-00-00 00:00:00 2024 0 Ljubljana 2024 Ljubljana 1 spletni vir (1 datoteka PDF (XVI, 35 str.)) 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 691.3(043.2) 165928 211787523 15064.pdf 15064.pdf 1 B664A76E501A953498ABEDEC7B9B0B37 4c9e344ce115537a0db42b761414c842d1f43a2a4ca04887ad1de49d8f21db81 1b476c42-8ae4-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=194057 Fakulteta za gradbeništvo in geodezijo 0 0 0