Effect of Ammonium ion content in Fly Ash after Selective Non-catalytic Reduction (SNCR) on Physical and Mechanical Properties of Autoclaved Aerated Concrete (AAC)

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F18%3APU126622" target="_blank" >RIV/00216305:26110/18:PU126622 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.4028/www.scientific.net/SSP.276.148" target="_blank" >http://dx.doi.org/10.4028/www.scientific.net/SSP.276.148</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.4028/www.scientific.net/SSP.276.148" target="_blank" >10.4028/www.scientific.net/SSP.276.148</a>

Result language

angličtina

Original language name

Effect of Ammonium ion content in Fly Ash after Selective Non-catalytic Reduction (SNCR) on Physical and Mechanical Properties of Autoclaved Aerated Concrete (AAC)

Original language description

After introducing SNCR in coal combustion process in power plants, the valuable by-product such as fly ash remains contaminated with amount of ammonia in form of NH 4 HSO 4 , (NH 4 ) 2 SO 4 respectively, which became undesirable in AAC technology because the toxic ammonia is released in the air during the mixing process. This paper deals with the effect of varying ammonia content in fly ash after selective non-catalytic reduction (SNCR) on the physical-mechanical properties of the fly ash based autoclaved aerated concrete (AAC) with the main focus on determination of the impact of the various content of ammonium ion in fly ash on the initial consistency of fresh slurry, the residual content of ammonium ion in hardened aerated matrix and also the impact on the bulk density, compressive strength and tobermorite formation after hydrothermal treatment. Seven batches of AAC, made out of fly ash with rising content of ammonium ion from 0 ppm to 250 ppm, were tested and based on the results obtained it was found out that ammonia is released during the mixing process entirely and doesn t remain in AAC after autoclaving, moreover it doesn t affect the properties of both fresh slurry (no apparent foaming effect noticed) and thermally treated samples of AAC. Formation of tobermorite wasn’t negatively affected.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

20101 - Civil engineering

Project

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Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Solid State Phenomena

ISBN

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ISSN

1662-9779

e-ISSN

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Number of pages

6

Pages from-to

148-153

Publisher name

Trans Tech Publications

Place of publication

Switzerland

Event location

Brno

Event date

Dec 7, 2017

Type of event by nationality

EUR - Evropská akce

UT code for WoS article

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