Research of the Interaction of Mechanically Activated Fillers Based on Silica and Cement Paste

The influence of grinding silica-containing raw materials in various mills on the reactivity of fillers at their contact with cement has been researched. The analysis of the research has shown that as a result of mechanical treatment of the feedstock a significant increase in its activity can be achieved. Thus, the greatest effect can be obtained by the use of mechanically activated filler of quartz sandstone and wet magnetic separation waste, ground in a planetary ball mill. It has been proved that this is due to the formation of Bronsted acid sites on the surface of fillers, which are capable of forming strong hydrogen bonds with the cement hydration products and of participating in ion exchange reactions intergranular contact formation. There is a pronounced dependence between the increase in the strength characteristics of the samples of system "mineral filler - cement" and increase of concentration of active sites on the surface of the mineral materials.