TY - CHAP A1 - Hünger, Klaus-Jürgen A1 - Kositz, Mario A1 - Danneberg, Matti A1 - Radnik, Jörg T1 - XPS investigations on quartzite surfaces of natural rock samples for proof of Al exposure T2 - 27th Annual Conference of the German Crystallographic Society / Zeitschrift für Kristallographie. Supplement Y1 - 2019 SN - 978-3-11-065403-5 SN - 0930-486X VL - 39 SP - S. 110 PB - De Gruyter CY - Berlin ER - TY - GEN A1 - Hünger, Klaus-Jürgen A1 - Kositz, Mario A1 - Danneberg, Matti A1 - Radnik, Jörg T1 - Enrichment of aluminium in the near-surface region of natural quarzite rock after aluminium exposure T2 - Surface and Interface Analysis N2 - 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. KW - alkali–silica reaction KW - quartzite rock KW - X-ray photoelectron spectroscopy Y1 - 2021 U6 - https://doi.org/10.1002/sia.6918 SN - 1096-9918 VL - 53 IS - 3 SP - 385 EP - 391 ER -