Eksperimentalna analiza vplivov soli na učinkovitost izboljšanja morskih glin z apnom za gradnjo nasipov : magistrsko delo

Jeraj, Blaž (author), Petkovšek, Ana (mentor), Smolar, Jasna (comentor)

V Luki Koper je potrebno stalno vzdrževanje in poglabljanje morskih plovnih poti. Pri tem nastanejo velike količine mešanice gline in vode, ki se odlagajo v namensko zgrajenih bazenih na kopnem, kjer se trdni delci usedejo, voda pa odteka nazaj v morje. Lokalno ime za proces je »refuliranje«, material v procesu pa »reful«. Obravnavani način ravnanja z refulom zavzema velike površine na kopnem, zato Luka Koper išče alternativne rešitve za boljšo rabo tega materiala. Ena od rešitev je izboljšanje lastnosti refula z ožemanjem in dodajanjem veziv. V nalogi smo raziskovali možnost izboljšanja lastnosti refula z apnom ter vplive soli na lastnosti mešanic apna in refula. Za določitev vplivov soli na delovanje apna, so bili odvzeti vzorci pripravljeni na tri načine: (a) s pranjem je bila iz refula odstranjena vsa sol, (b) uporabljen je bil naravno slan reful in (c) reful je bil negovan v zasičeni solni raztopini. Iz tako pripravljenih vzorcev so bile izdelane mešanice z apnom in izvedene laboratorijske preiskave: Atterbergove meje plastičnosti, enoosna tlačna trdnost, vodovpojnost po metodi Enslin-Neff, meja krčenja, sukcija, pH vrednost, metilen modro, Proctorjev preskus in kalifornijski indeks nosilnosti (CBR) ter nabrekanje. Raziskave so pokazale, da sol v porni vodi pozitivno vpliva na obnašanje refula, če je vlaga materiala blizu optimalne vlage. Sol zniža plastičnost, sposobnost navzemanja vode in kationsko izmenjalno kapaciteto zemljine ter zniža optimalno vlago in zviša maksimalno suho gostoto. Pri raziskavah ni bilo zaznati morebitnih škodljivih vplivov soli na obnašanje z apnom izboljšane zemljine.

• Language: Slovenian
• Keywords: apno, enoosna tlačna trdnost, Enslin-Neff, izboljšanje slane zemljine, izboljšanje z vezivi, Luka Koper, metilen modro, mulj, reful, sol
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Publisher: [B. Jeraj]
• Year: 2020
• PID: 20.500.12556/RUL-114237
• UDC: 624.131.22:627.21(497.4Koper)(043.3)
• COBISS.SI-ID: 15547395
• Publication date in RUL: 20.02.2020

JERAJ, Blaž, 2020, Eksperimentalna analiza vplivov soli na učinkovitost izboljšanja morskih glin z apnom za gradnjo nasipov : magistrsko delo [online]. Master’s thesis. B. Jeraj. [Accessed 26 April 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=114237

Secondary language

• Language: English
• Title: Experimental analysis of salt effects on the effectiveness of modified sea clay with lime for embankment construction : master thesis

Abstract

The port of Koper requires constant maintenance and deepening of the sea waterways. This produces large amounts of a clay-water mixture, which is deposited in purpose-built onshore basins where solid particles settle and the water flows back into the sea. The local name for the process is "reful" and the material in the process is "reful". The discussed method of handling reful occupies large areas on land, which is why Luka Koper is looking for alternative solutions for a better use of this material. One solution is to improve reful properties by filtrating and adding binders. In the paper, we explored the possibility of improving the properties of reful with lime and the effects of salt on the properties of mixtures of lime and reful. To determine the effects of salt on the action of lime, the samples taken were prepared in three ways: (a) by washing all salt was removed from reful, (b) naturally salty reful was used and (c) reful was nourished in a saturated salt solution. From the samples thus prepared, lime mixtures were prepared and laboratory tests were carried out: Atterberg plasticity limits, uniaxial compressive strength, Enslin-Neff method of water absorption, shrinkage limit, suction, pH value, methylene blue, Proctor test and California load index (CBR), and swelling. Research has shown that salt in pore water has a positive effect on the behaviour of reful when the moisture of the material is close to optimal moisture. Salt reduces the plasticity, water absorption capacity and cation exchange capacity of the soil and lowers optimum moisture and increases maximum dry density. The research did not detect any potential adverse effects of salt on the behaviour of the lime-improved soil.

• Keywords: reful, mud, Luka Koper, lime, modification with binders, salt, modification of saline soil, methylene blue, Enslin-Neff, unconfined compressive strength