Long, Tao, Wang, Qingyuan, Guan, Zhongwei 
ORCID: 0000-0002-6967-3508, Chen, Yu and Shi, Xiaoshuang
(2017)
Deterioration and Microstructural Evolution of the Fly Ash Geopolymer Concrete against MgSO4 Solution.
ADVANCES IN MATERIALS SCIENCE AND ENGINEERING, 2017.
pp. 1-11.
Abstract
<jats:p>Fly ash geopolymer concrete (FAGC) and ordinary Portland cement concrete (OPCC) specimens were immersed in 5% MgSO<jats:sub>4</jats:sub>solution undergoing 32 wetting-drying and heating-cooling cycles. Their compressive behavior was investigated after every 8 cycles. Several microstructure analysis techniques were applied on the samples to identify the materials formed due to magnesium sulfate attack, including XRD, FTIR, SEM, and EDS. Experimental results elucidated that the compressive strength loss ratio in the heating group of FAGC was 12.7%, while that of OPCC was 17.8%, which means that FAGC had better magnesium sulfate resistance than OPCC. The compressive strength loss of OPCC was due to the formation of gypsum under the magnesium sulfate attack exposed to wetting-drying and heating-cooling cycles. The deterioration mechanisms of FAGC against MgSO<jats:sub>4</jats:sub>solution were discovered to be that sodium aluminum silicate hydrate (N-A-S-H) gels reacted with MgSO<jats:sub>4</jats:sub>, leading to the creation of low strength magnesium aluminum silicate hydrate (M-A-S-H) gels.</jats:p>
| Item Type: | Article |
|---|---|
| Depositing User: | Symplectic Admin |
| Date Deposited: | 14 Mar 2019 11:42 |
| Last Modified: | 19 Jan 2023 00:57 |
| DOI: | 10.1155/2017/4247217 |
| Open Access URL: | https://doi.org/10.1155/2017/4247217 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3034245 |
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