Influence of the Nature of Modifying Carbohydrate on the Properties of Silicate Additives for Cement Systems

The use of organic modifying agents in the composition of the cement composition in significant concentrations actualizes the problem of their influence on the properties of the formed organo-silicate adducts. In this regard, it became necessary to study the effect of the molecular structure of the modifying disaccharide on the properties of dispersions of synthetic calcium silicates obtained by thermolysis from the corresponding modified calcium hydrosilicates. The properties of silicate-calcium dispersion (SCD) depending on the structure of the modifying carbohydrate and the effect of SCD additives on the technological properties of cement systems are determined by the methods of photocolorimetry, dynamic light scattering, viscometry, electron microscopy. The combination of dynamic light scattering and scanning electron microscopy determined the bimodal nature of the particle size distribution and the SCD morphology. It was found that these parameters do not depend on the molecular structure of the modifying carbohydrate. The molecular structure of the modifying carbohydrate determines the degree of carbohydrate occlusion by the silicate matrix and the nature of the effect of residual free modifying carbohydrate in the SCD on the properties of the modified cement system. It is found that SCD, modified by sucrose, has the greatest plasticizing activity, compared with SCD, modified by lactose, and maltose. It was found that the introduction of SCD in the cement binder is accompanied by a decrease in the normal density of the cement paste, the level of maximum reduction in the normal density depends on the type of modifying carbohydrate in the SCD composition.

E.A. SHOSHIN¹, Candidate of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)
V.V. STROKOVA², Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)

¹ Yuri Gagarin State Technical University of Saratov (77, Polytechnicheskaya Street, Saratov, 410054, Russian Federation)
² Belgorod State Technological University named after V.G. Shukhov (46, Kostyukova Street, Belgorod, 308012, Russian Federation)

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