Biološko samopopravljivi betonski sistemi

diplomsko delo

Nastja Strašek (Author), Marjan Marinšek (Mentor)

Abstract

Beton je material, ki se ga na svetu največ uporablja in proizvede. Problem predstavljajo razpoke, ki se lahko pojavijo v svežem ali strjenem betonu. Velik potencial v celjenju teh razpok predstavlja biološka samopopravljivost. V biološko samopopravljivih betonskih sistemih sodelujejo bakterije in hranila, ki proizvedejo kalcijev karbonat. Gre za kristale, ki napolnijo razpoke na površini ali v notranjosti betona. Katera vrsta bakterije je najprimernejša, je odvisno od tega, kakšen beton želimo narediti. Pomembno je, da so bakterije sposobne preživeti v betonu, saj je bazičnost betona velika. Bakterije pri presnovi potrebujejo kisik, zato se posledično zmanjša koncentracija kisika v betonu. To poveča obstojnost betonskih sistemov iz armiranega betona in zmanjša korozijo jekla v betonu. Dodajanje bakterij v beton poteka na različne načine. Lahko jih direktno vmešamo v betonsko mešanico, za bolj učinkovito rešitev pa veljajo kapsule. Ko bakterije proizvedejo kalcijev karbonat, vplivajo tudi na lastnosti betona. Študije so pokazale, da lahko dodatek bakterij in hranil izboljša tlačno trdnost, cepilno natezno trdnost, upogibno trdnost ter zmanjša prepustnost vode in klorida. Navsezadnje je samopopravljivost odvisna tudi od okolja, v katerem se beton nahaja. V ugodnem okolju se razpoke zapolnijo s kalcijevim karbonatom in tako vzpostavijo ponovno tesnost betona.

Keywords

beton;razpoke v betonu;samopopravljivost;biološki procesi;biomineralizacija;mikrobno inducirano obarjanje kalcijevega karbonata;bakterije;diplomska dela;

Data

Language:	Slovenian
Year of publishing:	2021
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FKKT - Faculty of Chemistry and Chemical Technology
Publisher:	[N. Strašek]
UDC:	666.972:66.098(043.2)
COBISS:	47845891
Views:	514
Downloads:	112
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Biologically self-healing concrete systems
Secondary abstract:	Concrete is the most used and produced material in the world. Problems can be caused by cracks that may form in fresh or hardened concrete. Biological self-healing represents a great potential in the healing of these cracks. Bacteria and nutrients are needed in biologically self-healing concrete systems to produce calcium carbonate. These crystals fill cracks on the surface or inside of concrete. Choosing the optimal type of bacterium depends on what concrete we aim to make. Due to high alkalinity of concrete, it is of importance that bacteria are able to survive in it. Bacteria need oxygen for their metabolic activity. Therefore, the concentration of oxygen in the concrete is reduced. This increases the durability of reinforced concrete structures and reduces the corrosion of steel in concrete. Adding bacteria to concrete can be carried out through various means. They can be mixed directly into the concrete mix, whereas capsules are considered a more effective solution. When bacteria produce calcium carbonate, they also affect the properties of the concrete. Studies have shown that the addition of bacteria and nutrients can improve compressive strength, splitting tensile strength and flexural strength, and reduce water and chloride permeability. Ultimately, the self-healing process depends on the environment of the concrete as well. In a favourable environment, the cracks are filled with calcium carbonate and thus restore the tightness of the concrete.
Secondary keywords:	concrete;self-healing;biological processes;bacteria;
Type (COBISS):	Bachelor thesis/paper
Study programme:	1000372
Embargo end date (OpenAIRE):	1970-01-01
Thesis comment:	Univ. v Ljubljani, Fak. za kemijo in kemijsko tehnologijo, UNI Kemijsko inženirstvo
Pages:	36 str.
ID:	12400263