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Blast furnace slags are added to Portland cements for environmental / economic reasons as well as for durability interests.When reaching high levels of cement replacement, mechanical strength of these systems can be reduced at early age due to low alkalinity of the medium in contact with slag particles.One idea to face this problem would be to compensate by external alkali sources (e.g.alkali salts like sodium silicate) to enhance the reaction of slag with similar approach as alkali activated slags.Nonetheless alkalis and silicium compounds will influence reactions of OPC phases responsible for complex mechanisms which are not yet fully described in the literature.