Експериментальні дослідження самонапруженого бетону

Abstract

UA: У статті розглянуто лабораторні дослідження самонапружених бетонних зразків. Для цього було виготовлено та випробувано п’ять серій призм та кубиків з різним складом. На наступному етапі дослідження було випробувано зразки на фізико-механічні характеристики та компоненти на ph-метрію. Для цього випробувано водні розчини добавок і суспензій цементу вибраних компонентів на pH і ЕРС.

EN: The paper considers the test results self-stressed concrete. In previous studies, it was noted that if the required level of pre-stress of concrete is provided, that is, at the level of a certain effective value, which depends on the structural and strength parameters of the structural element, then in the limit state it is possible to fully use the strength properties of steel, and the concrete core operates in a three-axis stress state under compression with extreme values of longitudinal and radial stress. Therefore, it is necessary to study different compositions of self-stressed concrete. To achieve this goal, five series of prisms with different compositions were manufactured and tested. According to the results of experimental studies, it was found that the first, fourth and fifth series of prisms corresponds to the self-stress brand Sp 1.2 and is self-stressed concrete the second series of prisms does not correspond to any of the self-stress brands due to the high content of Portland cement, the third series of prisms corresponds to the selfstress brand Sp 0.6 and is non-shrinkable concrete. Since the selected concrete is planned to be used as the core of a steel concrete column it is advisable to check the ph metric of the given components. At the next stage of the study, the cement of the selected components was tested for ph-metry. For this purpose, aqueous solutions of cement additives and suspensions of selected components were tested for pH and EMF. As a result, possible inhibition of metal corrosion is also confirmed by high pH values of the liquid phase at the level of 8.25 1 13.85 (which is significantly higher than neutral pH = 7) in the presence of both individual additives and cement suspensions containing additives. Therefore, the use of self-stressed concrete with these additives is advisable.