Publication detail

Influence of ammonia content in SNCR fly ash on phase composition and morphology of autoclaved aerated concrete (AAC)

GALVÁNKOVÁ, L. LÉDL, M. OPRAVIL, T. BERANOVÁ, D. TKACZ, J.

Original Title

Influence of ammonia content in SNCR fly ash on phase composition and morphology of autoclaved aerated concrete (AAC)

Type

conference paper

Language

English

Original Abstract

In production of AAC the fly ash was used as a source of SiO2 for many years. Now, after introducing a selective non-catalytic reduction (SNCR) technology to coal combustion process, the fly ash contain ammonia in a form of soluble salts, such as NH4HSO4 and (NH4)2SO4, which causes problems during manufacturing the AAC. Among all the influence of ammonia ions to the phase composition of the final product was not fully described. The main aim of this contribution is to describe the influence of ammonia to phase composition and morphology of autoclaved aerated concrete (AAC). For preparing AAC in laboratory conditions, the fly ash with various content of ammonia was used. The amount of ammonia before and after the hydrothermal reaction was measured by VIS spectrofotometry. The phase composition of prepared samples was determined by means of X-ray diffractometry and confirmed by TG-DTA analysis. The influence of the ammonia to the morphology of final products was studied by scanning electron microscopy.

Keywords

SNCR, fly ash, autoclaved aerated concrete, tobermorite

Authors

GALVÁNKOVÁ, L.; LÉDL, M.; OPRAVIL, T.; BERANOVÁ, D.; TKACZ, J.

Released

20. 6. 2018

Publisher

Trans Tech Publications

Location

Switzerland

ISBN

978-3-0357-1348-0

Book

Binders, Materials and Technologies in Modern Construction IV

ISBN

1662-9779

Periodical

Solid State Phenomena

Year of study

276

State

Swiss Confederation

Pages from

167

Pages to

172

Pages count

6

URL

https://doi.org/10.4028/www.scientific.net/SSP.276.167

BibTex

@inproceedings{BUT144920,
  author="Lucie {Dlabajová} and Matěj {Lédl} and Tomáš {Opravil} and Denisa {Beranová} and Jakub {Tkacz}",
  title="Influence of ammonia content in SNCR fly ash on phase composition and morphology of autoclaved aerated concrete (AAC)",
  booktitle="Binders, Materials and Technologies in Modern Construction IV",
  year="2018",
  journal="Solid State Phenomena",
  volume="276",
  pages="167--172",
  publisher="Trans Tech Publications",
  address="Switzerland",
  doi="10.4028/www.scientific.net/SSP.276.167",
  isbn="978-3-0357-1348-0",
  issn="1662-9779",
  url="https://doi.org/10.4028/www.scientific.net/SSP.276.167"
}