TY - GEN A1 - Mo, Xiangyin A1 - Jing, Yingjie A1 - Hünger, Klaus-Jürgen A1 - Kang, Cairong A1 - Shen, Jian T1 - Characteristics of alkali aggregate reaction T2 - Gui suan yan xue bao T2 - Journal of the Chinese Ceramic Society Y1 - 2008 SN - 0454-5648 VL - 36 IS - 10 SP - 1385 EP - 1389 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 -