Abstract. The possibility of using microsilica as a filler for cement plaster mortars was analyzed. As a result of the analysis of reference data, the features of the hydration of cement with microsilica were determined. In the experiments, the rheological characteristics of cement slurries containing microsilica with different contents of amorphous silica and specific surface area were studied. One of the most important objects of studying the effect of microsilica and superplasticizer additives on the properties of plaster solutions was optimization due to the optimal selection of the concentrations of additives, the rheological properties of mixtures and their ratio with technological and operational factors. For the analysis and optimization, the quantitative ratio between the indicators of the structure and properties of plaster solutions and their determining factors, the formulations and technologies were obtained in the form of experimental-statistical models calculated using the COMPEX system. Based on the results of measurements of the rheological properties of cement solutions containing silica fume with the highest specific surface area and SiO2 content, complete rheolo
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