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Machner, A.
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document
Understanding the influence of cementitious blended mixtures on pyrrhotite oxidation and internal sulphate attack
Abstract
The demand for aggregates and cement for construction has been rising faster than natural sources can sustain, enhancing the probability of using potentially problematic raw materials that may cause premature deterioration of concrete infrastructures (e.g., internal sulphate attack from oxidation of sulphide-bearing aggregates, ISA). Therefore, finding new protocols that allow the application of ISA reactive aggregates in concrete without reducing durability is imperative. This study aims to understand the effect of different exposure conditions (O<sub>2</sub>, NaOCl, H<sub>2</sub>O<sub>2</sub>, CO<sub>2</sub>, and temperature) in the Portland cement mortar phase assemblages through thermodynamic modelling, utilizing current performance-oriented methodologies and examining their benefits and obstacles. The results suggest that oxidation of FeS by air, H<sub>2</sub>O<sub>2</sub>, and NaOCl solutions results in different phase assemblages. While exposure to H<sub>2</sub>O<sub>2</sub> solution displayed similar phase assemblages to “natural” oxidation by exposure to air, NaOCl solutions change the phase assemblage and lowered the potential of volume gain. Further studies are needed comparing additional experimental data to the modelling, which the authors are currently conducting.