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The Effects of Aggressive Environments on the Properties of Fly Ash based Geopolymers

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2015
897.pdf (1.785Mb)
Authors
Baščarević, Zvezdana
Komljenović, Miroslav M
Nikolić, Violeta
Džunuzović, Nataša
Conference object (Published version)
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Abstract
This paper analyzes the effects of two different aggressive environments, concentrated ammonium nitrate solution (480 g/dm(3)) and sodium sulphate solution (50 g/dm(3)), on the structure and mechanical strength of fly ash based geopolymers. Geopolymer samples were subjected to the aggressive solutions over a period of 365 days. It was found that exposure to the NH4NO3 and Na2SO4 solutions caused small decrease in geopolymer strength (10-20 %). The most valuable insight into the structural changes caused by testing of the geopolymer samples in the aggressive solutions was provided by means of Si-29 MAS NMR. It was found that the immersion of geopolymer samples in the NH4NO3 solution caused breaking of Si-O-Al bonds in the aluminosilicate geopolymer gel structure. On the other hand, treatment of the geopolymer samples with the Na2SO4 solution resulted in breaking of Si-O-Si bonds in geopolymer gel structure and leaching of Si. It was concluded that the major changes in the geopolymer str...ucture were associated with the changes in the pH values of aggressive solutions during the testing.

Keywords:
geopolymer / durability / NH4NO3 / leaching / sulfate attack
Source:
2nd International Conference on Innovative Materials, Structures and Technologies, 2015, 96
Publisher:
  • IOP Publishing Ltd, Bristol

DOI: 10.1088/1757-899X/96/1/012001

ISBN: 978-9934-10-742-9

WoS: 000365029600001

Scopus: 2-s2.0-84960470036
[ Google Scholar ]
1
URI
http://rimsi.imsi.bg.ac.rs/handle/123456789/900
Collections
  • Radovi istraživača / Researchers’ publications
Institution/Community
Institut za multidisciplinarna istraživanja
TY  - CONF
AU  - Baščarević, Zvezdana
AU  - Komljenović, Miroslav M
AU  - Nikolić, Violeta
AU  - Džunuzović, Nataša
PY  - 2015
UR  - http://rimsi.imsi.bg.ac.rs/handle/123456789/900
AB  - This paper analyzes the effects of two different aggressive environments, concentrated ammonium nitrate solution (480 g/dm(3)) and sodium sulphate solution (50 g/dm(3)), on the structure and mechanical strength of fly ash based geopolymers. Geopolymer samples were subjected to the aggressive solutions over a period of 365 days. It was found that exposure to the NH4NO3 and Na2SO4 solutions caused small decrease in geopolymer strength (10-20 %). The most valuable insight into the structural changes caused by testing of the geopolymer samples in the aggressive solutions was provided by means of Si-29 MAS NMR. It was found that the immersion of geopolymer samples in the NH4NO3 solution caused breaking of Si-O-Al bonds in the aluminosilicate geopolymer gel structure. On the other hand, treatment of the geopolymer samples with the Na2SO4 solution resulted in breaking of Si-O-Si bonds in geopolymer gel structure and leaching of Si. It was concluded that the major changes in the geopolymer structure were associated with the changes in the pH values of aggressive solutions during the testing.
PB  - IOP Publishing Ltd, Bristol
C3  - 2nd International Conference on Innovative Materials, Structures and Technologies
T1  - The Effects of Aggressive Environments on the Properties of Fly Ash based Geopolymers
VL  - 96
DO  - 10.1088/1757-899X/96/1/012001
ER  - 
@conference{
author = "Baščarević, Zvezdana and Komljenović, Miroslav M and Nikolić, Violeta and Džunuzović, Nataša",
year = "2015",
abstract = "This paper analyzes the effects of two different aggressive environments, concentrated ammonium nitrate solution (480 g/dm(3)) and sodium sulphate solution (50 g/dm(3)), on the structure and mechanical strength of fly ash based geopolymers. Geopolymer samples were subjected to the aggressive solutions over a period of 365 days. It was found that exposure to the NH4NO3 and Na2SO4 solutions caused small decrease in geopolymer strength (10-20 %). The most valuable insight into the structural changes caused by testing of the geopolymer samples in the aggressive solutions was provided by means of Si-29 MAS NMR. It was found that the immersion of geopolymer samples in the NH4NO3 solution caused breaking of Si-O-Al bonds in the aluminosilicate geopolymer gel structure. On the other hand, treatment of the geopolymer samples with the Na2SO4 solution resulted in breaking of Si-O-Si bonds in geopolymer gel structure and leaching of Si. It was concluded that the major changes in the geopolymer structure were associated with the changes in the pH values of aggressive solutions during the testing.",
publisher = "IOP Publishing Ltd, Bristol",
journal = "2nd International Conference on Innovative Materials, Structures and Technologies",
title = "The Effects of Aggressive Environments on the Properties of Fly Ash based Geopolymers",
volume = "96",
doi = "10.1088/1757-899X/96/1/012001"
}
Baščarević, Z., Komljenović, M. M., Nikolić, V.,& Džunuzović, N.. (2015). The Effects of Aggressive Environments on the Properties of Fly Ash based Geopolymers. in 2nd International Conference on Innovative Materials, Structures and Technologies
IOP Publishing Ltd, Bristol., 96.
https://doi.org/10.1088/1757-899X/96/1/012001
Baščarević Z, Komljenović MM, Nikolić V, Džunuzović N. The Effects of Aggressive Environments on the Properties of Fly Ash based Geopolymers. in 2nd International Conference on Innovative Materials, Structures and Technologies. 2015;96.
doi:10.1088/1757-899X/96/1/012001 .
Baščarević, Zvezdana, Komljenović, Miroslav M, Nikolić, Violeta, Džunuzović, Nataša, "The Effects of Aggressive Environments on the Properties of Fly Ash based Geopolymers" in 2nd International Conference on Innovative Materials, Structures and Technologies, 96 (2015),
https://doi.org/10.1088/1757-899X/96/1/012001 . .

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