Journal article
Degradation resistance of different cementitious materials to phosphoric acid attack at early stage
J Ren, L Zhang, B Walkley, JR Black, R San Nicolas
Cement and Concrete Research | Published : 2022
Abstract
Sewer wastewater systems pose great threats to OPC-based concretes used for pipes due to the presence of various acids. Phosphoric acid can cause as much damage as sulphuric acid but has been very lightly studied. This study focuses on the early stage of the degradation process of different cementitious materials in phosphoric acid. Three types of cementitious materials are compared: OPC (100% cement), slag-blended OPC (slag/cement mass ratio at 65/35) and alkali-activated slag/fly ash pastes (slag/fly ash mass ratio at 50/50). Samples were exposed to phosphoric acid solution with a constant pH at 2.0 ± 0.2 for 44 days. The degradation kinetics, chemical and microstructural properties as wel..
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Awarded by China Scholarship Council
Funding Acknowledgements
The authors deliver great thanks to China Scholarship Council (CSC), the Geopolymer and Minerals Processing Group laboratory in the University of Melbourne for financial and infrastructure support. The Materials Characterisation and Fabrication Platform, at the University of Melbourne for the XRD analyses and the Bio21 Advanced Microscopy Facilities for the SEM analyses. This study was also supported by Mrs. Laura Jukes who provided great help during the experimental parts. Thank you for the ARC Research Hub for Nanoscience-based Construction Material Manufacturing (IH150100006) for financial support.