INFLUENCE OF THE METHOD OF COMMINUTION ON THE PROPERTIES OF CEMENT

The influence of cement fineness, the type and quantity of the sulphat e agent used, and the clinker composition on the properties of Portlan d cements was investigated after fine grinding in a ball mill and afte r a high-pressure comminution process resembling interparticulate comm inution. In general terms, interparticulate fine grinding led to a det erioration in the flow behaviour of the cement paste (flow table sprea d), to a shortening of the setting time, and to an increased initial r eactivity of the cement, recognizable by the intensity of the ''first' ' peak during calorific measurement. Corresponding investigations with pure clinker minerals showed that the reactivity of the C3S was incre ased and the ettringite-monosulphate conversion was significantly acce lerated by the interparticulate comminution.