Silica-modifying chemical admixtures for directed zeolitization of metakaolin-based alkali-activated materials

The effect of using trimethyladamantyl-ammonium hydroxide (TMAAOH) as a silica-modifying admixture to induce early-age mineralization during alkali-activation metakaolin was investigated and reported herein. In all material formulations, the use TMAAOH induced mineralization, increased mixture stiffening in fresh state, lowered total heat reaction. activating solutions with silica moduli above unity (Ms >1.0), mineralogy results demonstrate that induces nucleation growth metastable zeolitic phases, which correlated permeability plastic shrinkage paste. When added near ~1.0), controlled formation crystalline, silica-rich faujasite observed, reduced lower shrinkage. Together, these for first time silica-templating agents such can be exploited deisgn new chemical admixtures directly influence dynamics zeolitization alkali-activated materials.