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Erschienen in:
2021 | OriginalPaper | Buchkapitel
The Influence of Concrete Structure on the Destruction of Reinforced Concrete Bended Elements
verfasst von : Dorofeyev Vitaliy, Pushkar Natalia, Zinchenko Hanna
Erschienen in: Proceedings of EcoComfort 2020
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Abstract
When ecological effect of the environment on the structural constructions the changing structure of concrete influences definitely on the cracking, bearing capacity and durability. The mechanism of the formation of the composite building materials structure – the concretes with the formation of interfaces on the contact plane, inclusions, and matrix is described. Fine and coarse aggregate are considered as inclusions, and mortar and cement mortar as a matrix. Such a selection of structural levels makes it possible to establish the occurrence of dangerous defects, which size is larger than the size of the constituents of the element’s structure. Therefore, the size of the defect, safe at one structural level, becomes dangerous at a lower level. So a crack that is safe for concrete on large aggregates is destructive for cement stone. The questions of structure formation in concrete and reinforced concrete products on micro - and macro levels are considered.
The method of accounting for the initial (technological) damage to the iron reinforced concrete bending elements is presented. The tests of reinforced concrete beams under the action of low-cycle load are made, and their results are presented. The nature of crack formation and the development of cracks under the action of an external load in flexible concrete elements, depending on the technological damage have been established. The crack depth was determined depending on the load, using ultrasonic equipment. It is established that cracks from an external load develop from technological ones, and along their paths.