20.500.12556/RUL-173016 Vpliv dodatkov na bazi ksantanskega gumija na strižno trdnost zemljin diplomska naloga The influence of xanthan gum-based soil conditioners on the shear strength of soils graduation thesis V zadnjem desetletju se vedno več pozornosti posveča raziskavam biopolimerov, kot alternativi za tretiranje zemljin. Prednost biopolimerov v primerjavi z drugimi vezivi, kot npr. cementom in apnom je predvsem njihova cena in bistveno manjši ogljični odtis. Eden najpogosteje raziskovanih biopolimerov je ksantanski gumi, predvsem zaradi svoje nizke cene, dostopnosti in dokazane učinkovitosti. Ksantanski gumi kot dodatek k zemljinam spremeni njihove mehanske in hidravlične lastnosti. Predvsem izboljša sposobnost zadrževanja vode med deževnimi in sušnimi obdobji. Izziv pri uporabi ksantanskega gumija pa predstavlja njegova občutljivost na vlago. Pri nizki vlažnosti deluje kot vezivo med zrni zemljine, pri višji vlažnosti pa tvori hidrogel, ki poslabša stik med zrni zemljine in lahko posledično zmanjša strižno trdnost. Cilj diplomske naloge je bil raziskati vpliv dodatka na osnovi ksantanskega gumija na strižno trdnost zemljin, ugotoviti, kako lastnosti zemljin vplivajo na učinkovitost dodatka ter ovrednotiti vpliv vlage na drenirano strižno trdnost tretiranih in netretiranih zemljin. V okviru laboratorijskih preiskav smo za dve različni zemljini (prva iz Heldburga v Nemčiji in druga iz Katalonije v Španiji) opravili neposredne strižne preizkuse na vzorcih netretirane in tretirane zemljine pri različnih vsebnostih vlage. Rezultati, predstavljeni v preglednicah in grafih kažejo, da vlaga bistveno vpliva na učinkovitost biopolimerov; v zasičenih pogojih je drenirana strižna trdnost tretirane zemljine nižja od drenirane strižne trdnosti netretirane zemljine. Rezultate smo tudi podrobno analizirali ter jih primerjali z drugimi članki in dostopno literaturo. In the last decade, increasing attention has been paid to the study of biopolymers as an alternative for soil treatment. Compared to conventional binders such as cement and lime, the main advantages of biopolymers are their lower cost and significantly smaller carbon footprint. One of the most extensively studied biopolymers is xanthan gum, primarily due to its low price, availability and proven effectiveness. When added to soils, xanthan gum alerts their mechanical and hydraulic properties, perticularly enhancing their ability to retain water during periods of rainfall and drought. However, the main challenge associated with xanthan gum is its sensitivity to moisture. At low moisture contents, it acts as a binder between soil particles, whereas at higher moisture levels it forms a hydrogel, which reduces interparticle contact and may consequently decrease shear strength. The aim of this thesis was to investigate the effect of xanthan gum-based soil conditioners on the shear strength of soils, to determine how soil properties influence the effectiveness of the soil conditioner and to evaluate the influence of moisture on the drained shear strength of treated and untreated soils. Laboratory investigations were carried out on two different soils, one originating from Heldburg in Germany and the other from Catalonia in Spain. DDirect shear tests were performed on specimens prepared from untreated and treated soil at different moisture contents. The results presented in the tables and graphs show that moisture content has a significant influence on the effectiveness of biopolymers; under saturated conditions, the drained shear strength of the treated soils is lower than that of the untreated soils. The results were further analysed in detail and compared with findings from other studies and the available literature. diplomske naloge gradbeništvo drenirana strižna trdnost ksantanski gumi neposredni strižni preizkus tretiranje vlažnost zemljina graduation thesis civil engineering drained shear strength xanthan gum direct shear test soil treatment moisture content soil true false false [D. Makuc] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2025-09-12 08:46:03 2025-09-12 08:46:06 2025-10-30 03:56:48 0000-00-00 00:00:00 2025 0 Ljubljana 2025 Ljubljana 1 spletni vir (1 datoteka PDF (VIII, 28 str.)) 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 620.176:577.11(043.2) 174014 249190403 19164.pdf 19164.pdf 1 93FECCD525E6769BF4B5B4E5A3F951FB 5086a3cbee967a4285f31a379e784273a9fc23d88bd7fc5b22885814ff8bd40e fe4c34b4-8fa3-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=217169 Fakulteta za gradbeništvo in geodezijo 0 0 0