Optimization of compositions and technology of production of small-clinker floured cements using the most effective fillers

Abstract

Considering the physical chemistry of grinding it is worth quoting the grinding of mineral building material as ‚the change of physical-chemical properties of finely ground materials can not only be due to the reducing the particle sizes, at mechanical grinding significant changes of the crystalline structure of their surface layers (thickness 15-20 microns) take place, in many cases the technological properties of fine powders are not so much due to dispersability but are namely due to the structure rupture‛, at that the energy costs for this are ‚significantly greater than for the exposal of surfaces with a clean cleavage‛. The speed of heterogeneous chemical processes involving fine powders is determined primarily not by the magnitude of their specific surface area, as commonly is believed, but by the decrease of energy of activation as the result of crystalline structure rupture and amorphization. However, both specific surface area and energy demands to achieve are actual evaluation of the effectiveness of any material grinding at a particular unit. The main factor of the production process of cements of low water demand is the grinding, characterized by grindability.