Abstract
To ensure concrete durability in reinforced concrete structures is one of the main problems of modern concrete technology. In the State Standard (GOST 31384-2017) we can find the restrictions to concrete composition depending on the class and index of operating media, but there is no information on how they affect the durability, what kind of service life of concrete and reinforced concrete structures they guarantee. This articles shows that the restrictions to concrete composition are necessary but not sufficient to ensure concrete durability especially under harsh conditions of its operation. This is due to the fact that in the national standards the role of the basic concrete strength index, which is the microstructure of hydrated phases of cement stone, is not taken into consideration. The cement gel formed by calcium hydrocilicates and being the densest and strongest component of the structure, determines the concrete durability provided it is stable in specific environmental operating conditions. The proposed methods of assessing the stability of concrete microstructure make it possible to optimize technological parameters of production of reinforced concrete structures of high performance and durability.
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