nanosilica

There were analyzed the ways of reduction of СО2 emissions in the cement industry. It was shown that a significant reduction of СО2 emissions in construction is achieved through the using of composite cements with a lower clinker factor that meets the requirements of the low carbon strategy for the cement industry. In this case, the replacement of part of Portland cement clinker with mineral additives in such cements leads decreasing of their strength, especially at early age.

The results of the study of catalytic activity of nanocomposites containing mono- and bimetaliic manganese(II), cobalt(II), copper(II), and zinc(II) complexes with Schiff bases [(salicyl-aldiminopropyl (L1) and 2-hydroxy4-methoxybenzophenoniminopropyl (L2)] immobilized on silica in the reaction of ozone decomposition are presented. The catalytic activity dependence on a nature of complexing metal ions and ligands has been determined.

The work deals with the modification of mortars by small quantities of nanodispersed material. The effect of amorphous nanosilica on Portland cement hydration and hardening has been investigated. The amorphous nanosilica is compared with the known mineral additive – microsilica.