Publication detail

Mikrostrukturní změny jemnozrnných betonů po ročním působení kyseliny sírové

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

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.

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.

ISBN

NEUVEDENO

Pages from

1

Pages to

7

Pages count

7

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"
}