Macro and microstructural evolution of low-calcium fly ash-based geopolymer mortar exposed to sulphuric acid corrosion
Article
Article Title | Macro and microstructural evolution of low-calcium fly ash-based geopolymer mortar exposed to sulphuric acid corrosion |
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ERA Journal ID | 4164 |
Article Category | Article |
Authors | Ariyadasa, Piumika W., Manalo, Allan C., Lokuge, Weena, Aravinthan, Vasantha, Gerdes, Andreas, Kaltenbach, Jonas and Galvan, Beatriz Arevalo |
Journal Title | Cement and Concrete Research |
Journal Citation | 178 |
Article Number | 107436 |
Number of Pages | 13 |
Year | 2024 |
Publisher | Elsevier |
Place of Publication | United Kingdom |
ISSN | 0008-8846 |
1873-3948 | |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.cemconres.2024.107436 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S0008884624000176 |
Abstract | This article reports an investigation of the behaviour of a low-calcium fly ash-only geopolymer (FAGP) mortar in comparison to Ordinary Portland Cement (OPC) mortar and a commercially available geospray mortar (P-GP) under laboratory-induced sewer conditions. An aggressive sewer condition was simulated by an accelerated corrosion rate, with mortar specimens immersed in 0.5pH sulphuric acid at a controlled temperature of 40 °C for 31 days. The macro and microstructural evolution of the specimens was analysed through visual observations, mass changes, and SEM coupled with EDS, XRD, and MIP analysis. OPC exhibited a 49 % mass loss attributed to the loss of the gypsum layer formed during the acid attack. The mass reduction in the low-calcium FAGP was only 6 %, which was 42 % lower than that of OPC, indicating that calcium-bearing hydrates in the cementitious binder systems are susceptible to sulphuric acid corrosion. The acid-resistant properties of FAGP mortar suggest its suitability for sewer rehabilitation applications. |
Keywords | Low-calcium fly ash geopolymerLaboratory-induced sewer corrosionAcid neutralisationMass changeMicrostructural evolution |
Related Output | |
Is part of | Assessing durability of geopolymer concrete mortar for sewer pipe coating |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 400505. Construction materials |
401602. Composite and hybrid materials | |
Public Notes | This article is part of a UniSQ Thesis by publication. See Related Output. |
Byline Affiliations | Centre for Future Materials |
School of Engineering | |
Karlsruhe Institute of Technology, Germany |
https://research.usq.edu.au/item/z5x99/macro-and-microstructural-evolution-of-low-calcium-fly-ash-based-geopolymer-mortar-exposed-to-sulphuric-acid-corrosion
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