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Enrichment of aluminium in the near‐surface region of natural quartzite rock after aluminium exposure
Author(s) -
Hüenger KlausJürgen,
Kositz Mario,
Danneberg Matti,
Radnik Jörg
Publication year - 2021
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.6918
Subject(s) - aluminium , aluminosilicate , metakaolin , durability , materials science , natural (archaeology) , metallurgy , mineralogy , composite material , geology , chemistry , cement , catalysis , organic chemistry , paleontology
Alkali–silica reaction (ASR) is an ongoing problem that causes damage to concrete constructions and reduces their durability. Therefore, minimizing this undesired reaction is of great interest for both safety and economic reasons. Additives containing high aluminium content are very effective in reducing the release of silica and enhancing the durability of concrete; however, the mechanism for this effect is still under discussion. In this study, an enrichment of aluminium in the near‐surface region was observed for natural quartzite rock after storage in Al (OH) 3 and metakaolin as aluminium sources, from which we conclude that the formation of aluminosilicate sheets of a few nanometres inhibits the silica release; this hypothesis is supported by high‐resolution spectra of Al 2p, Si 2p and O 1s.