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

Czech Title

Mikrostrukturní změny jemnozrnných betonů po ročním působení kyseliny sírové

Language

cs

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.

Czech 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.

Documents

BibTex 


@inproceedings{BUT114934,
  author="Martin {Vyšvařil} and Markéta {Rovnaníková} and Patrik {Bayer}",
  title="Mikrostrukturní změny jemnozrnných betonů po ročním působení kyseliny sírové",
  annote="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.",
  booktitle="CONSTRUMAT 2015",
  chapter="114934",
  howpublished="electronic, physical medium",
  year="2015",
  month="june",
  pages="1--7",
  type="conference paper"
}