In this paper are analyzes the effect of additives for improving the milling cement of the trade name HEA 213 Grace or the HEA2® manufacturer of the GCP Applied Technologies Inc. Samples of the cement are prepared by using a semi-industrial ball mill at the laboratory of the CEMEX Hrvatska d.d.. The milling process was carried out with mill rotation speed of 50 rpm in duration of the 40-55 minutes. Addition of the of a grinding additive was in the amount of 0; 0,017; 0.032 and 0.048% added on the cement mass. For all prepared samples of cements, for each of them, are determined the required amount of water to achieve normal consistency as well as settings time. The measurement results indicate that the cement made with the addition of additives in the amount of 0.048 wt.% have a highest specific surface, and test of settings time show that beginning of binding are start at earlier time than in all other samples. In the samples of cement paste prepared with the addition of the Glenium ACE 430 superplasticizer, the results of testing show that the required amount of water to achieve normal consistency as well as setting time that the additive has the role of reducing the water and its affecting on the hydration as accelerator. Results of application of the dissolution methods show that it’s are suitable for application on cement systems, systems without the addition of slag, where obtained experimental value are close to the literature value for Ordinary portland cement. However, the dissolution method is not suitable for application on the blended cement systems, the results of provided tests on blended cement system show very high oscillations in the heat of hydration which cannot be corrected without of knowledge of the degree unreacted phase of used slag. The content of portlandite presence as crystal phase in the hydrated samples prepared with replacement addition furnace slag show on increase a content of it even that addition of slag has the dilution effect on system, which confirm the physical role of the slag as a nucleation site for hydration product.