The Effect of Additives of Mechanically Activated Mineral Fillers on the Properties of Composite Gypsum Binders

Abstract

Problem statement. The purpose of this research is to study the influence of the method of grinding quartz and carbonate fillers in a ball mill and in an electro-mass classifier with intensive mechanical activation of the surface of the filler particles on the efficiency of their introduction into the composite gypsum binders. Results. The effect of mechanochemical activation of the surface of quartz filler particles during grinding in the electro-mass classifier to the optimal specific surface of 500 m2/kg with the introduction of 5% by weight of a ground additive in the composite gypsum binders, an increase in strength parameters by 15% is achieved compared to compositions without adding filler additives. With the introduction of additives in the amount of up to 15% by weight, the strength and water resistance are maintained at the level of control samples. Compared to the introduction of a similar amount of quartz filler, ground in a ball mill, a maximum increase in strength indicators by 10% is achieved. When grinding carbonate fillers in an electro-mass classifier compared to grinding in a ball mill, there is a slight increase in the strength of the binder. Conclusions. The significance of the results for the construction industry lies in the fact that it is effectually to use an electro-mass classifier in the preparation of quartz filler additives introduced into the composition of composite gypsum binders.