Assessing durability of geopolymer concrete mortar for sewer pipe coating

PhD by Publication


Ariyadasa, Piumika Waswani. 2024. Assessing durability of geopolymer concrete mortar for sewer pipe coating. PhD by Publication Doctor of Philosophy. University of Southern Queensland. https://doi.org/10.26192/z9y49
Title

Assessing durability of geopolymer concrete mortar for sewer pipe coating

TypePhD by Publication
AuthorsAriyadasa, Piumika Waswani
Supervisor
1. FirstProf Allan Manalo
2. SecondA/Pr Weena Lokuge
3. ThirdDr Vasanthadevi Aravinthan
Institution of OriginUniversity of Southern Queensland
Qualification NameDoctor of Philosophy
Number of Pages184
Year2024
PublisherUniversity of Southern Queensland
Place of PublicationAustralia
Digital Object Identifier (DOI)https://doi.org/10.26192/z9y49
Abstract

Alkali-activated geopolymer (GP) is emerging as a promising alternative to Ordinary Portland Cement (OPC) in addressing microbial-induced concrete corrosion (MICC) of concrete structures in aggressive sewerage environments. However, identifying an effective binder formulation for GP to combat aggressive MICC remains a challenge, highlighting the need for developing sustainable repair materials. This study conducted extensive experimental studies to assess the long-term performance and durability of low calcium-based geopolymer mortar under simulated typical aggressive sewer conditions. Class F fly ash (FA) serves as the sole precursor for GP mortar. The approach included developing, characterising, and selecting optimal low-calcium FA-only geopolymer (FAGP) mortar mixes, evaluating bond strength to typical sewer pipe substrates, investigating acid resistance in terms of macro and microstructural evolution, and ultimately assessing FAGP degradation mechanism and longterm performance under hostile typical sewer conditions. The results demonstrate that FAGP mortar, with appropriate adjustments, can achieve sprayable consistency structural mortar comparable to standard OPC repair mortar. Material compatibility and adhesion properties of FAGP mortar surpass the standard OPC, regardless of substrate conditions. The holistic approach of assessing the deterioration of FAGP qualitatively and quantitatively demonstrated that acid exposure caused no substantial changes to the microstructural properties, corroborating the results for mass and cross-sectional analysis. FAGP retained 30% of its mechanical integrity under highly aggressive sewer conditions, whereas OPC failed to endure beyond the initial phase of the exposure period. The phase alterations and the resultant functional groups in the acid-exposed FAGP indicated new formations. However, these formations appeared to impede the acid reaction, thereby slowing the corrosion process compared to OPC. Despite the corrosion process intensifying with prolonged exposure duration, FAGP exhibited excellent acid resistance relative to OPC, regardless of the sewer conditions. This comprehensive evaluation confirms the feasibility of using geopolymers as repair materials in sewer rehabilitation, demonstrating their high acid resistance, durability, and long-term performance under aggressive conditions.

KeywordsLow calcium Fly Ash; Alkali-activated geopolymer; Microbial Induced Concrete Corrosion; structural grade repair mortar; sewer rehabilitation; durability andlong-term performances
Related Output
Has partMacro and microstructural evolution of low-calcium fly ash-based geopolymer mortar exposed to sulphuric acid corrosion
Has partBond performance of fly ash-based geopolymer mortar in simulated concrete sewer substrate
Contains Sensitive ContentDoes not contain sensitive content
ANZSRC Field of Research 2020400510. Structural engineering
Public Notes

File reproduced in accordance with the copyright policy of the publisher/author/creator.

Byline AffiliationsCentre for Future Materials (Research)
Academic Affairs Administration
Centre for Future Materials
Permalink -

https://research.usq.edu.au/item/z9y49/assessing-durability-of-geopolymer-concrete-mortar-for-sewer-pipe-coating

Restricted files

Published Version

  • 13
    total views
  • 0
    total downloads
  • 1
    views this month
  • 0
    downloads this month

Export as

Related outputs

Bond performance of fly ash-based geopolymer mortar in simulated concrete sewer substrate
Ariyadasa, Piumika W., Manalo, Allan C., Lokuge, Weena, Aravinthan, Vasantha, Pasupathy, Kiru and Gerdes, Andreas. 2024. "Bond performance of fly ash-based geopolymer mortar in simulated concrete sewer substrate." Construction and Building Materials. 446. https://doi.org/10.1016/j.conbuildmat.2024.137927
Macro and microstructural evolution of low-calcium fly ash-based geopolymer mortar exposed to sulphuric acid corrosion
Ariyadasa, Piumika W., Manalo, Allan C., Lokuge, Weena, Aravinthan, Vasantha, Gerdes, Andreas, Kaltenbach, Jonas and Galvan, Beatriz Arevalo. 2024. "Macro and microstructural evolution of low-calcium fly ash-based geopolymer mortar exposed to sulphuric acid corrosion." Cement and Concrete Research. 178. https://doi.org/10.1016/j.cemconres.2024.107436