Formation of C-S-H, C-A-S-H and N-A-S-H gels in alkali activated fly ash binders

摘要

The C-S-H, C-A-S-H and N-A-S-H gels are the base hydration products of the alkali-activated glassy state materials. The geopolymers properties are determinated by the parameters of such hydrates. In the article there was taken into consideration studies about the formation process and the properties of C-S-H, C-A-S-H and the N-A-S-H gels. This work is a trial of gels synthesis in solutions and comparison with the obtained hydration products with the phases that were formed in naturally matured alkali activated fly ash mortars and concretes. For synthesis, the alumina nitrate, calcium nitrate and sodium silicate were used. There were conducted the long-term synthesis in room temperature which brings the solid hydration products. The obtained gel phases were examined by XRD, DTA, IR and SEM-EDS methods. The presented results illustrate the properties of the synthesized phases and the comparison among them.