Effectivness of Cement Composite Nanomodification with Nanoscale Barium Hydrosilicates

Nanoscale modification of building materials often leads to significant improvement of operational properties. To obtain apparent and stable nanomodification effect for composites with inhomogeneous structure (cement, gypsum and similar matrices) it is necessary to eliminate defects on different spatial levels. It is evident that to increase the effectiveness of nanoscale additives it is necessary to reduce the amount of capillaries and large macropores in material. The necessary preliminary operation is the optimization of structure at micro-scale level. Only after such stage the nanomodification should be performed. The applicability of such approach was examined with the most used binder which is subject to further nanomodification – portland cement, and also with the binder composition, which is the mixture of portland cement optimally matched with the mineral additive based on micro-scale reactive barium hydrosilicates (with diameter d ~ 6 mm) of the composition BaO·SiO₂·6H₂O. The composition of the nanoscale additives with barium hydrosilicates was obtained in dilute solutions by means of low-temperature sol-gel synthesis. It is shown that total porosity of the material significantly changes due to of the decrease in the proportion of macro-scale pores. The variation in pore size distribution is examined and the effect of nanoscale modification on the structural parameters of the pore space is established. Examination of the strength of the obtained artificial stone confirms the assumption that composites which are optimized at all structural levels possess higher properties.

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

Moscow State University of Civil Engineering (26, Yaroslavskoe Highway, Moscow, 129337, Russian Federation)

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