Publication detail

One-year sulfate attack on various types of fine grained concrete

VYŠVAŘIL, M. ROVNANÍKOVÁ, M.

Original Title

One-year sulfate attack on various types of fine grained concrete

Type

conference paper

Language

English

Original Abstract

Concrete shows extensive degradation when exposed to the external sulfate attack, characterized by ingress of sulfate ions from surrounding medium. This process leads to gradual pH decrease, to expansion, cracking, spalling of concrete, and finally to the complete disintegration of the material. Sulfate attack becomes a major destructor in sewage collection systems where the concrete sewer pipes are exposed to sulfates from wastewater as well as from biogenic activity of bacteria. This paper is focused on the sulfate attack on fine grained concrete where the effect of 0.5% sulfuric acid, simulating biogenic sulfuric acid corrosion, 5% sodium sulfate solution and solution simulating sewage water on various types of concrete has been investigated. The concrete specimens were characterized after exposition to corroding media by their mechanical parameters, microstructure and in the case of H2SO4 as the most aggressive corroding solution, the mineralogical composition was also determined by XRD analysis. It was found that the exposition to Na2SO4 solution twofold improved flexural strengths of concrete mixes based on Portland and sulfate-resisting cements. Contrary, the exposition to H2SO4 solution significantly decreased compressive strengths of all types of concrete

Keywords

sulfates; pH; ettringite; gypsum; concrete; strength;

Authors

VYŠVAŘIL, M.; ROVNANÍKOVÁ, M.

RIV year

2015

Released

14. 9. 2015

ISBN

978-3-03859-377-5

Book

Ecological and New Building Materials and Products

ISBN

1662-8985

Periodical

Advanced Materials Research (online)

Year of study

1124

State

Swiss Confederation

Pages from

313

Pages to

318

Pages count

6

BibTex

@inproceedings{BUT116482,
  author="Martin {Vyšvařil} and Markéta {Rovnaníková}",
  title="One-year sulfate attack on various types of fine grained concrete",
  booktitle="Ecological and New Building Materials and Products",
  year="2015",
  journal="Advanced Materials Research
 (online)",
  volume="1124",
  pages="313--318",
  doi="10.4028/www.scientific.net/AMR.1124.313",
  isbn="978-3-03859-377-5",
  issn="1662-8985"
}