Print Email Facebook Twitter Degradation of alkali-activated slag subjected to water immersion Title Degradation of alkali-activated slag subjected to water immersion Author Liu, C. (TU Delft Materials and Environment) Liang, X. (TU Delft Materials and Environment) Chen, Y. (TU Delft DC systems, Energy conversion & Storage; South China University of Technology) Li, Z. (TU Delft Materials and Environment; University of Sheffield) Ye, G. (TU Delft Materials and Environment) Date 2023 Abstract In this study, the impacts of tap water immersion on the pore solution, phase assemblages, gel chemistry and structure, and pore structure of alkali-activated slag (AAS) pastes were studied. AAS degrades under such condition and the potential mechanisms can be concluded as lower reaction rates, gel decomposition and carbonation. The leaching of Na+ and OH− at early stages hinders the reaction of slag, which leads to a slower formation of reaction products. Long-term leaching can result in gel decomposition after 90 d. Coarsened gel pores and capillary pores are both identified in water-immersed samples. Additionally, the leached Ca2+ can react with the dissolved CO2 in tap water to form calcium carbonate. A calcium carbonate layer is observed surrounding the paste while the inner matrix is free of carbonation. The insights provided by this paper contribute to understanding the behaviors and durability of AAS in underwater conditions. Subject Alkali-activated slagCarbonationCuringLeachingWater immersion To reference this document use: http://resolver.tudelft.nl/uuid:4db85814-789b-4bea-8d22-37245045117e DOI https://doi.org/10.1016/j.cemconcomp.2023.105157 Embargo date 2023-11-30 ISSN 0958-9465 Source Cement and Concrete Composites, 142 Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2023 C. Liu, X. Liang, Y. Chen, Z. Li, G. Ye Files PDF 1_s2.0_S0958946523002317_main.pdf 12.69 MB Close viewer /islandora/object/uuid:4db85814-789b-4bea-8d22-37245045117e/datastream/OBJ/view