RESISTANCE OF CONCRETES AT PERIODIC EXTERNAL INFLUENCES
Journal Title: Збірник наукових праць Українського державного університету залізничного транспорту - Year 2018, Vol 181, Issue 15
Abstract
The purpose of the work is to increase resistance of concrete in conditions of repeated freezing-thawing and wetting-drying. An important property of concrete is its ability to adapt to the periodical effect of external factors by self-organization of the structure. It assumes the presence at the material of active elements capable of changing their parameters adequately to impacts. Such elements are cracks and inner surfaces of partition as integral elements of the structure of any material. The manifestation of adaptation effects connected with self-development of cracks can be realized as the transformation of cracks into inner surfaces of partition. It stops the growth of cracks, increases the discreteness of composites and creates preconditions for the localization of deformations and stresses in individual blocks of material. It contributes to the dissipation of excess energy on the banks of various cracks and inner surfaces of partition. The ability of cracks to redistribute deformations between blocks prevents their local accumulation that reduces the general stress-strain state of the material. Sets of active elements can be to receive by directing the structural organization of concrete. Poly-structure of concretes implies mutual influence and interaction of the structural levels at all periods of their life cycle. The operating factor of structure formation can be a change in the ratio of adhesion and cohesive bonding forces at the surface of partition between the matrix material and the fillers. In the local volumes of macrostructure of concrete, a variety of sets of active elements are formed, which at the level of the material structure integrative determine its functional potential and the conditions of interaction with the environment. Concrete whose structure was initiated by selective adhesion of a matrix to the surface of fillers differed in the raised values of properties. Sets of active elements are the factors of safe functioning of building constructions.
Authors and Affiliations
Oksana Korobko, Valery Vyrovoy, Vladimir Sukhanov, Yuri Zakorchemny
Keywords
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- EP ID EP535552
- DOI 10.18664/1994-7852.181.2018.156456
- Views 41
- Downloads 0
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