Durability of Concrete (Problems and Perspectives)


  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal


Title: Durability of Concrete (Problems and Perspectives)

Author(s): V. L. Chernyavski and 0. P. Mchedlov-Petrossyan

Publication: Special Publication

Volume: 170


Appears on pages(s): 1283-1292

Keywords: Concretes; corrosion durability; models.

Date: 7/1/1997

By now the theoretical foundations of the rational use of the SO called protective properties of concrete as a physico-chemical system have been laid. They are: the capacity to maintain stability and a non-equilibrium state in a changing environment. It should be kept in mind that concrete is practically the only material with such sensitivity to the environment components as clinkers, slags, ashes, and other relicts which can be considered reserve sources of creative processes in the building of structure by hydration and pozzolanic reaction. The technical state of knowledge of hydraulic cement concrete includes a wide range of characteristics defining its functioning and reaction to various factors of environment. During the service life of constructions it is possible to rely on the natural process of partial rehabilitation or of maintaining the reacted state of the concrete at a certain level of physico-chemical adaptation resulting from continuing hydration of reaction of clinker, slag, ashes, and other relicts. Moisture, electrolites, and elevated temperatures especially contribute to it. Here it should be ne marked as important for providing stable polymorphism in the form of stable hydrate phases, the appearance in their structure of ion-modifiers, specific for environment. to ensure correctness of the practical result it is necessary to observe the multitude of parameters of hydraulic cement concretes because real exploitation of the environment determines rather complicated responses of the object. It is especially important during comparative tests of durability of concretes intended for use in media with many kinds of impact. The modern theory of such tests is characterized by mathematical models elaborated by it that do not basically take into account the evolution of internal state in the cement paste caused by creative (hydration) and destructive (corrosion) processes. The determination of concrete adaptability by means of imitation modelling, while taking into consideration genetic and technological factors, should be perspective. All mentioned above is to provide optimal regimes for exploitation of concrete and reinforced concrete constructions.