TY - CONF A1 - Hu, Nanjie Hu A1 - Hüsken, Götz A1 - Gluth, Gregor A1 - Kühne, Hans-Carsten T1 - Influence of activator composition on the strength, shrinkage and chloride migration resistance of alkali-activated slag mortars N2 - Alkali-activated slag materials are known for their high Chloride penetration resistance. This makes them potentially applicable as repair systems for damaged steel-reinforced concrete structures, which are exposed to chloride attack. For this purpose, the influence of the activator composition, i.e. the SiO2 and Na2O concentration of the alkaline solution on a) the compressive strength, b) shrinkage and mass change and c) the resistance against chloride penetration of four alkali-activated slag mortars (AASM) were studied. An ordinary Portland cement-based mortar was used as the reference sample. Increasing SiO2 and Na2O concentrations increased the strength, shrinkage and mass loss of the AASMs. The resistance of the mortars against chloride penetration was evaluated using the non-steady-state migration coefficient Dnssm obtained from NT BUILD 492. The results indicate that the Dnssm is related to differences in the pore solution of the AASMs rather than to differences in their microstructure. An upcoming study of the authors is going to evaluate this hypothesis by the accelerated chloride penetration (diffusion) test. T2 - The 6th International Conference on Non-Traditional Cement and Concrete CY - Brno, Czech Republic DA - 20.06.2017 KW - Alkali-activated slag mortar KW - Strength KW - Shrinkage KW - Chloride migration coefficient PY - 2017 AN - OPUS4-44080 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -