449 KB34 KB195120262025Bokan-Bosiljkov, VioletaMarinšek, MarjanŠtukovnik, PetraTurk, Tilenštevilka:letn. 74str. 163-170ISSN:0017-2774COBISSID_HOST:251871747URN:URN:NBN:SI:doc-M78CS3Q3slZveza društev gradbenih inženirjev in tehnikov SlovenijeGradbeni vestnikbetonconcreteconcrete settingheavy metalsrecikliran agregatrecycled aggregatetežke kovinevezanje betonaVpliv težkih kovin iz recikliranega agregata na lastnosti betona| Impact of heavy metals from recycled aggregate on concrete properties|The green transition in construction requires, among other measures, reducing of the carbon footprint of concrete, which remains the most widely used construction material worldwide. In addition to the well-established use of secondary raw materials in cement production, increasing attention is being paid to the use of recycled aggregate as a partial or complete replacement for natural stone aggregate. Since recycled aggregate may originate from various industrial processes, it often contains impurities that affect the hydration processes of cement. This has been observed in recycled aggregate from the mining industry, where ore-bound heavy metals delay the cement matrix setting and slow down the strength development. In this study, recycled aggregate and its influence on the properties of cement composites were systematically characterized. We determined its mineralogical composition, monitored changes in ultrasonic pulse velocity and temperature during the setting and hardening of cement composites with different recycled aggregate contents, and measured the time-dependent development of compressive and flexural strength. Based on the analysis of the results, we identified the threshold concentration of recycled aggregate that is suitable for use in constructionZeleni prehod v gradbeništvu med drugim zahteva zmanjšanje ogljičnega odtisa betona, ki ostaja najbolj uporabljan gradbeni material na svetu. Poleg že uveljavljene uporabe sekundarnih surovin pri proizvodnji cementa se vse bolj raziskuje tudi uporaba recikliranega agregata kot delne ali popolne zamenjave naravnega kamenega materiala. Recikliran agregat lahko izvira iz različnih industrijskih procesov, zato pogosto vsebuje nečistoče, ki vplivajo na hidratacijske procese cementa. To se je pokazalo pri recikliranem agregatu iz rudarske industrije, kjer prisotne orudene težke kovine zavirajo vezanje cementne matrice in upočasnijo razvoj trdnosti. V raziskavi smo recikliran agregat in njegov vpliv na lastnosti cementnih kompozitov sistematično okarakterizirali, določili njegovo mineraloško sestavo, spremljali spremembe hitrosti ultrazvočnih valov in temperature med vezanjem in strjevanjem cementnih kompozitov z različnimi deleži recikliranega ag regata ter določili časovni razvoj njihove tlačne in upogibne trdnosti. Na podlagi analize rezultatov smo opredelili mejno koncentracijo recikliranega agregata, ki je še primerna za uporabo v gradbeništvuTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaZveza društev gradbenih inženirjev in tehnikov Slovenije