TY - CHAP A1 - Hünger, Klaus-Jürgen A1 - Gerasch, Robert A1 - Sander, Ingolf A1 - Brigzinsky, Maria T1 - On the Reactivity of calcined clays from lower Lusatia for the production of durable Concrete Structures T2 - Calcined Clays for Sustainable Concrete, Proceedings of the 2nd International Conference on Calcined Clays for Sustainable Concrete N2 - Metakaolin used as a SCM in concrete is obviously a very good tool to improve the resistance against acid and alkali attack too. Even if, finally, the mechanisms are not fully understood until now, lower mass loss (acid attack) or lower expansions (ASR) are showing their efficiency. Metakaolin, burnt by using relatively pure natural kaolin clays, contains Al2O3 and SiO2 only with a ratio of approx. one. The question is: Are there any other clays maybe also in mixtures which are suitable for use as an admixture for concrete or even as a binder? This research work has a strong regional reference. Three clays from Lower Lusatia were selected. The clays and a wide range of mixtures too were burnt at different temperatures (between 600 to 700 °C) to find out the “best” results for such materials. The mixing process has also the background to eliminate fluctuations in the compositions of the clays. A continuous working rotary kiln with a continuous supply of clay materials was used for the production of calcined clay samples. Using this equipment, the rate of heating and the duration of stay of the material under almost practical conditions can be varied. Mineralogical compositions, measured before and after heating, confirm the formation of amorphous phases already under relatively low temperature conditions in dependence on the clay mineral species and the mixing relations. Reactivity (activity index and solubility in alkaline solutions) of each sample were determined and mortar bars were produced. In dependence on their reactivity parameters the so produced calcined clay samples influence mechanical and durability properties of concrete structures. The aim of this research project is to produce concrete bars with such calcined clay as a SCM and store them under extreme conditions in some of the Lusatian lakes. KW - Clay mixtures Solubility KW - Meta clays KW - Activity index KW - Solubility KW - Pozzolani behavior KW - Dynamic modulus of elasticity Y1 - 2017 SN - 978-94-024-1206-2 SN - 978-94-024-1207-9 SP - 205 EP - 211 PB - Springer CY - Dordrecht ER - TY - GEN A1 - Yu, Chenjie A1 - Mo, Xiangyin A1 - Deng, Min A1 - Tang, Mingshu A1 - Shen, Jian A1 - Fournier, Benoit A1 - Hünger, Klaus-Jürgen T1 - Behavior characteristic of lithium ion in alkali-aggregate reaction T2 - Journal of Southeast University (Natural Science Edition) T2 - Dongnan-Daxue-xuebao Y1 - 2009 SN - 1001-0505 VL - 39 IS - 1 SP - 127 EP - 130 ER - TY - GEN A1 - Mo, Xingyin A1 - Zhang, Yue A1 - Yu, Chenjie A1 - Deng, Min A1 - Tang, Mingshu A1 - Hünger, Klaus-Jürgen A1 - Fournier, Benoit T1 - Investigation of alkali-silica reaction inhibited by new lithium compound T2 - ACI Materials Journal Y1 - 2010 SN - 0889-325x VL - 1 IS - 107 SP - 37 EP - 41 ER - TY - GEN A1 - Kositz, Mario A1 - Hünger, Klaus-Jürgen T1 - Untersuchungen zur Korrelation von AKR induzierten Dehnungen und der Löslichkeit von Gesteinskörnungen unter Berücksichtigung von NaCl; Teil 1 T2 - Beton : die Fachzeitschrift für Bau + Technik Y1 - 2021 SN - 0005-9846 VL - 71 IS - 3 SP - 60 EP - 65 ER - TY - GEN A1 - Kositz, Mario A1 - Hünger, Klaus-Jürgen T1 - Untersuchungen zur Korrelation von AKR induzierten Dehnungen und der Löslichkeit von Gesteinskörnungen unter Berücksichtigung von NaCl; Teil 2 T2 - Beton : die Fachzeitschrift für Bau + Technik Y1 - 2021 SN - 0005-9846 VL - 71 IS - 4 SP - 120 EP - 124 ER - TY - CHAP A1 - Hünger, Klaus-Jürgen T1 - The Self-inhibition process of certain greywackes T2 - Proceedings of the 12th International Conference on Alkali-Aggregate Reaction in Concrete, October 15 - 19, 2004, Beijing International Convention Center, Beijing, China, Vol. 1 Y1 - 2004 SN - 978-7-5062-7033-5 SP - 125 EP - 134 PB - Internat. Acad. Publ. CY - Beijing ER - TY - CHAP A1 - Scholz, Yvonne A1 - Hünger, Klaus-Jürgen T1 - Untersuchungen zur Vermeidung von Betonschädigungen infolge AKR durch Zugabe spezieller neuartiger Zusatzstoffe T2 - Tagungsbericht, IBAUSIL, 16. Internationale Baustofftagung : 20. - 23. September 2006, Weimar, Bundesrepublik Deutschland, Bd. 2 Y1 - 2006 SN - 3-00-018263-2 SP - 2-0485 EP - 2-0492 PB - F.-A.-Finger-Inst. CY - Weimar ER - TY - CHAP A1 - Hünger, Klaus-Jürgen A1 - Bachmann, Robert A1 - Scholz, Yvonne A1 - Hübert, Cornelia A1 - Mo, X. ED - Broekmans, Maarten A. T. M. ED - Wigum, Børge J. T1 - An accelerated chemical test method for ASR carried out directly at aggregate grains T2 - Conference proceedings, 13th International Conference on Alkali-Aggregate Reaction in Concrete, Trondheim, Norway, 16 - 20 June 2008 Y1 - 2008 SN - 978-82-7385-128-4 SP - 782 EP - 793 CY - Trondheim ER - TY - CHAP A1 - Hünger, Klaus-Jürgen A1 - Hübert, Cornelia A1 - Heidemann, D. ED - Broekmans, Maarten A. T. M. ED - Wigum, Børge J. T1 - Formation of Kanemite from Precursors as a Model for ASR Gel Hydration T2 - Conference proceedings, 13th International Conference on Alkali-Aggregate Reaction in Concrete, Trondheim, Norway, 16 - 20 June 2008 Y1 - 2008 SN - 978-82-7385-128-4 SP - 130 EP - 139 CY - Trondheim ER - TY - CHAP A1 - Hünger, Klaus-Jürgen A1 - Scholz, Yvonne A1 - Hübert, Cornelia A1 - Kronemann, Jens T1 - Entwicklung und Beurteilung der Wirkung eines speziellen AKR-vermeidenden Zusatzstoffes T2 - 18. Internationale Baustofftagung IBAUSIL, F.A. Finger-Institut für Baustoffkunde, Bauhaus-Universität Weimar, Tagungsbericht, Teil 2 Y1 - 2013 SN - 978-3-00-034075-8 SP - 2-0585 PB - F.-A.-Finger-Inst. CY - Weimar ER -