The Initial Setting Time of Ground Granulated Blastfurnace Slag GGBS and Its Relation to the Modulus of the Alkali-Activating Solution

Paper in proceeding, 2014

In this study the initial setting time of water glass activated slag was investigated by the traditional Vicat method. It was found that the initial setting time is mainly influenced by two parameters; 1) the specific surface area of the material and 2) the modulus of the water glass used for the activation. The IR and 29Si-NMR spectroscopies were used to identify the structures of the water glass activator. The results show that the silica configuration is highly dependent on the modulus. The relationships between the initial setting time, specific surface area and silica structures are discussed.