Activation of Fillers for Cement-Mineral Systems

This work studies the activated mineral fillers used to modify cement-mineral materials. Modification of cement-mineral systems by activated fillers provides an opportunity to increase the level of strength indicators of composite road-building material, as well as to reduce the content of the main binder. Dolomite, zeolite-containing rock, lime and their mixtures were used as mineral fillers. Mechanical activation of fillers was carried out in the Vortex 297 vortex layer apparatus with different exposure times. To ensure effective activation, the optimum filling factor of the grinding chamber and the size of ferromagnetic particles were determined. The laser analyzer was used to study the character of dispersity distribution of mineral filler particles as a function of the activation time. The surface state of mineral fillers after activation was assessed by the acid–base interactions. The free surface energy was evaluated, which characterizes the surface ability to interphase interaction. The effects of activation time and the content of mineral filler components on compressive strength of cement paste samples were established. The optimum activation time of mineral filler components in the vortex layer apparatus and their ratio were determined.