Features of taking into account the modulus of elasticity of concrete at an early age when calculating its own thermally stressed state of structures

The article presents experimental data on the determination of the concrete elasticity modulus at the age of 1, 3, 7, 14 and 28 days. A comparative analysis of the obtained data with normalized values was also carried out in accordance with the requirements of SR 63.13330.2018 "Concrete and reinforced concrete structures. Basic provisions" for the same strength of concrete. It is established that the difference in the experimental and normalized values of the tests obtained can reach 35%. It is shown that in the calculations of intrinsic temperature stresses, the change in the elastic modulus of concrete should be connected with the features of structure formation in cement stone. The obtained results should be considered when calculating the thermally stressed state of concrete for reinforced concrete structures at an early age.