Materialni modeli sodobnih geopolimernih betonov za računske analize gradbenih konstrukcij

diplomska naloga št.: 223/OG-MK

Katja Hrobat (Author), Jerneja Kolšek (Mentor), Peter Češarek (Co-mentor)

Abstract

Geopolimerni betoni so izdelani iz mešanice peska, agregata, veziva in alkalne raztopine. Za vezivo se največkrat uporablja elektrofiltrski pepel, žlindra ali njuna mešanica. Pri proizvodnji geopolimernega betona porabimo manj energije in v zrak izpustimo manj toplogrednih plinov, kot jih pri pripravi surovin (portlandskega cementa) za izdelavo običajnega betona. Dokazano je, da sta mehanska in kemijska odpornost geopolimernega betona podobni ali boljši, kot so lastnosti običajnega betona. Zaradi dobre kemijske odpornosti bi jih v prihodnosti lahko uporabljali v morski in obmorski gradnji, kanalizacijskih sistemih, pa tudi v protipožarni zaščiti. Podoben odziv pri preizkušanju mehanskih karakteristik vzorcev geopolimernega betona v primerjavi z vzorci običajnega betona nakazuje na možnost uporabe v gradbenih konstrukcijah. Zato so raziskovalci razvili materialne modele, s katerimi bi v prihodnosti lahko pridobili ustrezne tabele o trdnostnih in deformacijskih vrednostih materiala. V tabelah so podatki za izračun nepogrešljivega pripomočka pri dimenzioniranju konstrukcij, to je materialnega diagrama. Testi odzivov enostavnih konstrukcij iz geopolimernih betonov, za katere zaenkrat poznamo materialne diagrame, kažejo, da imajo konstrukcije iz geopolimernih betonov podoben odziv kot konstrukcije iz običajnih betonov, če nanje deluje obtežba. Sklepamo lahko, da bi za dimenzioniranje konstrukcij iz geopolimerrnih betonov lahko uporabljali enake postopke, kot jih poznamo iz dimenzioniranja konstrukcij iz običajnih betonov. Za nadaljnji razvoj materiala je potrebno na globalni ravni predpisati priporočila za izdelavo mešanic geopolimernih betonov.

Keywords

gradbeništvo;diplomska naloga;VSŠ;GR;GR-OG;geopolimerni beton;materialni diagram;elektrofiltrski pepel;žlindra;enoosni preizkus tlačne trdnosti;odziv gradbenih konstrukcij;materialni model;

Data

Language:	Slovenian
Year of publishing:	2022
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FGG - Faculty of Civil and Geodetic Engineering
Publisher:	[K. Hrobat]
UDC:	539.411:624.042(078.9)(043.2)
COBISS:	129132547
Views:	50
Downloads:	6
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Material models of modern geopolymer concrete for structural analysis
Secondary abstract:	Geopolymer concretes are made from a mixture of sand, aggregate, binder and alkaline solution. Fly ash, slag or its mixture is most often used as a binder. In the production of geopolymer concrete, less energy is used and fewer greenhouse gases are released into the air than in the preparation of raw materials (Portland cement) for the production of conventional concrete. It has been proven that the mechanical and chemical properties of geopolymer concrete are similar or better than those of conventional concrete. Due to the good chemical properties, they could be used in the future in marine and coastal construction, sewage systems, as well as in fire protection. A similar response when testing the mechanical characteristics of geopolymer concrete samples compared to conventional concrete samples indicates the possibility of application in building structures. Therefore, the researchers developed material models that could be used in the future to obtain appropriate tables on the strength and deformation values of materials. The tables contain data for the calculation of an indispensable tool when dimensioning constructions, i.e. the material diagram. Response tests of simple constructions made of geopolymer concrete, for which we currently know the material diagram, show that constructions made of geopolymer concrete have a similar response to constructions made of conventional concrete, if a load is applied to them. We can conclude that for the dimensioning of structures made of geopolymeric concrete, the same procedures that are known for the dimensioning of structures made of conventional concrete could be used. For the further development of the material, it is necessary to prescribe recommendations for the production of mixed geopolymer concrete at the global level.
Secondary keywords:	graduation thesis;civil engineering;geopolymer concrete;material diagram;fly ash;slag,;uniaxial compressive strength test;response of building structures;material model;
Type (COBISS):	Bachelor thesis/paper
Study programme:	0
Embargo end date (OpenAIRE):	1970-01-01
Thesis comment:	Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Pages:	XVIII, 82 str.
ID:	16534352