CHARACTERIZATION AND MECHANICAL AND SHRINKAGE PERFORMANCE OF GLASS POWDER/CALCIUM MODIFIED METAKAOLIN-BASED GEOPOLYMER

This study aims to investigate the effects of added calcium or glass powder on the phase formation, development of micro/atomic structure and mechanical/durability performance of metakaolin-based geopolymer. The correlation between the calcium contents and the formation process of the geopolymeric gel was studied with the in-situ X-ray Pair Distribution Function (PDF) and X-ray Diffraction (XRD) tests. The results showed that the calcium-contained phases can serve as nucleation sites for the precipitation of sodium aluminosilicate gel to accelerate the alkali-activated reaction.