@inproceedings{HuengerKositzDannebergetal., author = {H{\"u}nger, Klaus-J{\"u}rgen and Kositz, Mario and Danneberg, Matti and Radnik, J{\"o}rg}, title = {XPS investigations on quartzite surfaces of natural rock samples for proof of Al exposure}, series = {27th Annual Conference of the German Crystallographic Society / Zeitschrift f{\"u}r Kristallographie. Supplement}, volume = {39}, booktitle = {27th Annual Conference of the German Crystallographic Society / Zeitschrift f{\"u}r Kristallographie. Supplement}, publisher = {De Gruyter}, address = {Berlin}, isbn = {978-3-11-065403-5}, issn = {0930-486X}, pages = {S. 110}, language = {en} } @misc{HuengerKositzDannebergetal., author = {H{\"u}nger, Klaus-J{\"u}rgen and Kositz, Mario and Danneberg, Matti and Radnik, J{\"o}rg}, title = {Enrichment of aluminium in the near-surface region of natural quarzite rock after aluminium exposure}, series = {Surface and Interface Analysis}, volume = {53}, journal = {Surface and Interface Analysis}, number = {3}, issn = {1096-9918}, doi = {10.1002/sia.6918}, pages = {385 -- 391}, abstract = {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.}, language = {en} }