Vpliv pH in soli v vodi na lastnosti bentonita

diplomska naloga št.: 129/B-VOI

Lucija Babij (Author), Janko Logar (Mentor), Jasna Smolar (Co-mentor)

Abstract

Zaradi inertnosti in svojih značilnih lastnosti je bentonit vse pogosteje uporabljen naravni proizvod v geotehniki in geotehniki okolja. Uporablja se pri izkopih jarkov, v predorogradnji, za injektiranje razpok v temeljnih tleh, za tesnjenje deponij, remediacije onesnaženih tal, idr. Izstopajoče in za stroko pomembne lastnosti tega materiala so: nedrenirana strižna trdnost, viskoznost, nabrekalni potencial, tiksotropija, sposobnost vezanja določenih polutantov in nizka vodoprepustnost. Prve tri smo podrobneje obravnavali v tej nalogi in sicer nas je zanimalo, kako se spreminjajo izbrane lastnosti bentonita, ko je izpostavljen različno slanim oz. kislim (nizek pH) okoljem. Spremembe lastnosti zaradi različno slanih ali različno kislih pornih raztopin smo ugotavljali na dveh tipih bentonitov istega proizvajalca – kalcijevem in natrijevem. Njuno obnašanje smo preverjali z laboratorijskimi preiskavami ugotavljanja meje židkosti, nedrenirane strižne trdnosti, reoloških lastnosti in preiskav nabrekanja. Dobljene rezultate smo prikazali v preglednicah ali pa v obliki grafov, jih analizirali in med seboj primerjali. Kritično smo se opredelili glede vpliva priprave preizkušancev in postopkov izvedbe preiskav ter ocenili uporabnost preiskav za načrtovanje ciljane rabe bentonitov.

Keywords

gradbeništvo;diplomske naloge;UNI;VOI;B-VOI;bentonit;geotehnika okolja;meja židkosti;nedrenirana strižna trdnost;reološke lastnosti;nabrekanje;

Data

Language:	Slovenian
Year of publishing:	2023
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FGG - Faculty of Civil and Geodetic Engineering
Publisher:	[L. Babij]
UDC:	624.13:666.322-047.44(043.2)
COBISS:	178619395
Views:	137
Downloads:	12
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Influence of water pH and salinity on the behaviour of bentonite
Secondary abstract:	As a natural product, bentonite is increasingly used in geotechnical engineering and environmental geotechnics due to its inertness and its characteristic properties. It is used in trench excavating, tunnel construction, grouting of cracks in bedrock soils, sealing of landfills, remediation of contaminated soils, etc. The outstanding and important properties of this material for the profession are undrained shear strength, viscosity, swelling potential, thixotropy, ability to bind certain pollutants and water permeability. The first three are discussed in more detail in this thesis, where we were interested in how selected properties of bentonite change when exposed to different saline or acidic (low pH) environments. The changes in properties due to different saline or acidic pore solutions were determined on two types of bentonite from the same manufacturer - calcium and sodium. Their behaviour was verified by laboratory tests to determine the liquid limit, undrained shear strength, rheological properties and swelling. The results were presented in tables or graphs then analysed and compared with each other. We critically commented on the influence of the specimen’s preparation and test procedures then assessed the usefulness of the tests for planning the targeted use of bentonites.
Secondary keywords:	graduation thesis;civil engineering;bentonite;environmental geotechnics;liquid limit;undrained shear strength;rheological properties;swelling potential;
Type (COBISS):	Bachelor thesis/paper
Thesis comment:	Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Pages:	X, 34 str.
ID:	22264513