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Erschienen in:
2024 | OriginalPaper | Buchkapitel
Automated Mineralogical Analysis (QEMSCAN®) as a Complementary Petrographic Tool in Assessing the Potential Alkalis Release from Aggregates
verfasst von : Violeta Ramos, Isabel Fernandes, Gavyn K. Rollinson, Jens Andersen, Esperanza Menéndez, António Santos Silva
Erschienen in: Proceedings of the 17th International Conference on Alkali-Aggregate Reaction in Concrete
Verlag: Springer Nature Switzerland
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Abstract
Though an important subject that has been investigated for several decades, the full understanding of the alkali release from aggregates, its contributing factors and role in the alkali-silica reaction still remains a challenge for the scientific community. Recently, the RILEM AAR-8 test method was developed and several improvements to this methodology have already been proposed. In this paper, automated scanning mineralogy (QEMSCAN®) is introduced as a complementary tool for petrographic characterization in order to better understand the factors contributing to the alkali release from aggregates with a similar mineralogy. It was used to examine distinctive textures, grain sizes and alteration of a mylonite, a cataclasite, a gneiss, a granite and an altered granite. The QEMSCAN® analysis enabled a more thorough understanding of the aggregates whilst complimenting the optical petrography.