: 79-84
Received: February 21, 2021
Revised: April 02, 2021
Accepted: May 13, 2021
Lviv Polytechnic National University, Department of building production
Lviv Polytechnic National University, Department of building production
Lviv Polytechnic National University, Department of building production
Lviv Polytechnic National University, Department of building production

The paper presents the results of research concerning the peculiarities of modern High Performance Concretes based on cementitious systems "Portland cement – active mineral additives – micro fillers – superplasticizers – accelerators of hardening". Physico-chemical regularities of structure formation of super plasticized cementitious systems are established. It is shown that the formation of secondary fine ettringite due to the interaction of active alumina with calcium hydroxide and gypsum in the non-clinker part of the binder because of the effect of "self-reinforcement" compensates for shrinkage and increases the strength of the cementitious system. The modification of the cementitious matrix makes it possible to obtain Rapid Hardening High Performance Concretes that provide early loading and turnover of the formwork of monolithic constructions.

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