20.500.12556/DiRROS-27361 Vpliv težkih kovin iz recikliranega agregata na lastnosti betona Impact of heavy metals from recycled aggregate on concrete properties Zeleni 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 gradbeništvu. 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 construction. recikliran agregat težke kovine beton vezanje betona recycled aggregate heavy metals concrete concrete setting true false true Slovenski jezik Angleški jezik Neznano 2026-02-03 13:41:16 2026-02-03 13:41:16 2026-02-04 04:07:12 0000-00-00 00:00:00 2025 0 0 str. 163-170 Letn. 74 sep. 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 666.123.4:620.284:691.32 0017-2774 251871747 RAZ_Turk_Tilen_2025.pdf RAZ_Turk_Tilen_2025.pdf 1 8549F6614D7450F9A7D47A5D9E6C5530 1a99e79cc77465c97dbe18c088789aab89eae95716176b3bbc2a657242567857 f8676b33-00fd-11f1-93b0-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=39990 GV-09-25-Clanek-4-T.pdf GV-09-25-Clanek-4-T.pdf 1 D4EC76459E86D0C8FF6E1625A682567A 680e64f1ffb223cd0fce8c467c5733e5e1e3fd4615ca937fd175b555ddbd6cec a2f8d9a7-00fd-11f1-93b0-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=39989 https://www.zveza-dgits.si/wp-content/uploads/2025/09/GV-09-25-Clanek-4-T.pdf 0 4d64dad3-00fe-11f1-93b0-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=39992 Zveza društev gradbenih inženirjev in tehnikov Slovenije Gradbeni vestnik 0 0 0