Abstract
In massive concrete structures there is a danger of temperature cracks. One of the measures to get rid of these type of cracks is the breakdown of an array into concreting blocks. In this paper, we consider the provision of thermal crack resistance of a massive concrete structure during the construction period. A comparative analysis of the thermally stressed state of the structure erected by one and two blocks in height is carried out. The influence of the overlap intervals of the concrete block in the calculations of thermal crack resistance was evaluated. Thermal crack resistance is evaluated by the deformation criterion. The authors found that the breakdown of the concrete structure into concreting blocks reduces the elongation deformations by 37%. The results show that increasing the overlap interval of a concrete block more effectively ensures thermal crack resistance of the structure.
Highlights
In massive concrete and reinforced concrete structures there is a danger of thermal cracking [1]
The results show that increasing the overlap interval of a concrete block more effectively ensures thermal crack resistance of the structure
The purpose of this paper is to evaluate the effect of breaking a massive block into concreting blocks, as well as assessing the impact of the overlap interval of concrete blocks in the calculations of thermal crack resistance
Summary
In massive concrete and reinforced concrete structures there is a danger of thermal cracking [1]. One of the reasons causing internal and surface temperature cracks are significant thermal tensile stresses. They result from the release of large amounts of heat during the reaction of cement with water. Equations of the theory of heat conduction were obtained These equations describe thermal processes occurring inside massive concrete structures [8], equations of mechanics of a deformable medium, which make it possible to obtain a reliable picture of thermal stress fields in monolithic concrete structures, taking into account creep [9,10,11], and aging of the material [13].
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