The use of Rapid-Hardening Cement Components in Concrete During the Construction of Buildings and Structures at Construction Sites

Abstract

The article considers modern approaches to the creation of nanomodified ultra-fast-hardening cementing systems based on Portland cement and high-performance concretes based on them. The problems of ensuring intensive strength gain of concrete in the early stages of hardening under conditions of increased mobility of concrete mixtures are analyzed. The feasibility of using the nanotechnological concept of controlling the structure formation of cement stone in order to regulate the kinetics of hydration processes and form a dense microstructure of concrete is substantiated.

It has been shown that the use of nanomodifiers allows for the production of highly functional concretes with increased strength, durability, and operational reliability without the need to use special types of cements. The modern development of construction technologies is accompanied by increasing requirements for manufacturability, functional efficiency, durability and operational reliability of building materials. In these conditions, highly functional concretes, made from highly mobile concrete mixtures and characterized by regulated construction and technical properties, acquire special importance. One of the key requirements for such materials is to ensure intensive strength gain of concrete in the early hardening period, especially when using concrete mixtures with increased mobility.

This necessitates the use of ultra-rapid-hardening cements or cementing systems capable of providing accelerated development of the structure and formation of the bearing capacity of the material at the initial stages of hardening. In this regard, a relevant direction is the development of modified ultra-rapid-hardening cementing systems based on Portland cement clinker, which can be integrated into traditional technological schemes for concrete production.