Mazurak T. Nanomodified Рortland cement compositions and rapid hardening concretes based on them.

The dissertation is dedicated to the development of theoretical bases of nano-engineered cements technology for obtaining of Portland cement compositions that provide the creation of technological Rapid hardening concretes of a multi-level structure due to the system combination of nano- and ultrafine mineral components and superplasticizer based on the polycarboxylate ether with nano-engineered chains. The influence of granulometric composition of mineral components on their surface activity and physical and chemical peculiarities of hydration and hardening processes of nanomodified Portland cement compositions was established. The problem of development of high-tech and Rapid hardening concretes with improved performance can solved due to the directed formation of the microstructure of the cement matrix in the early period of hydration. The compositions of the Rapid hardening concretes of multi-level structure using nanosystem technologies "bottom-up" and "top-down" were designed, their building and technical properties were investigated, industrial testing was carried out and technical and economic efficiency of their use was calculated.