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VYŠVAŘIL, M. ROVNANÍKOVÁ, M. BAYER, P.
Original Title
Mikrostrukturní změny jemnozrnných betonů po ročním působení kyseliny sírové
English Title
Microstructural changes of fine-grained concretes after the one year treatement in sulfuric acid
Type
conference paper
Language
Czech
Original Abstract
In sewer collection systems there exists a corrosion problem involving the destruction of concrete pipes or structures by sulfuric acid produced by sulfur-oxidizing bacteria from hydrogen sulfide. This type of corrosion is termed microbiologically induced corrosion (MIC), or more precisely biogenic sulfuric acid corrosion. Present study is focused on the effect of 0.5% sulfuric acid, simulating biogenic sulfuric acid corrosion, on microstructural changes of various types of concrete after one year of treatment. Microstructural changes have been investigated by mercury intrusion porosimetry and scanning electron microscopy. It was found that the greatest changes in porosity and microstructure occured in the sample made from Portland cement and with the high temperature fly ash one. The pores of the samples were filled by crystals of gypsum, ettringite, calcite and portlandite and also by Al(OH)3 in the form of hollow sticks.
English abstract
Keywords
beton, síranová koroze, sádrovec, ettringit, mikrostruktura, porozita
Key words in English
concrete, sulfate attack, gypsum, ettringite, microstructure, porosity
Authors
VYŠVAŘIL, M.; ROVNANÍKOVÁ, M.; BAYER, P.
RIV year
2015
Released
3. 6. 2015
ISBN
978-80-214-5205-3
Book
CONSTRUMAT 2015
Edition number
1.
NEUVEDENO
Pages from
1
Pages to
7
Pages count
BibTex
@inproceedings{BUT114934, author="Martin {Vyšvařil} and Markéta {Rovnaníková} and Patrik {Bayer}", title="Mikrostrukturní změny jemnozrnných betonů po ročním působení kyseliny sírové", booktitle="CONSTRUMAT 2015", year="2015", number="1.", pages="1--7", isbn="978-80-214-5205-3" }