Abstract
Many objects built in the past do not meet the new construction standards and may be at risk from the action of special loads. Therefore, there is a need for their structural elements to be reinforced by increasing the moment of inertia, and with this, there is a need to increase the cross-sectional dimensions. The realization of reinforcing structural elements, particularly columns and beams, can be easily achieved by increasing their dimensions using self-compacting concrete, which benefits from its excellent workability properties as fresh concrete, enabling easy filling of formworks. In this case, the reinforced elements of reinforced concrete structures will be subjected to a new process of strains, whether elastic or more importantly, they are also subjected to strains in the long-term process such as shrinkage strains and creep strains. For the analysis of strains in structural elements reinforced with self-compacting concrete both at the moment of load action and in the long-term process of load action, an experiment was carried out for a period of two years. During this experiment, the mechanical and deformable characteristics of elements (laboratory samples and beams) from normal concrete and from self-compacting concrete were analysed. The research of these characteristics was carried out both at the time t0=40 days, of the load action, and in the long-term process up to the time t∞=400 days This paper presents the results obtained for shrinkage strains and creep strains during the analysis of beams made of ordinary concrete, self-compacting concrete, as well as repaired beams, whose core is made of ordinary concrete and after hardening, at the age of 40 days they are wrapped with a layer of self-compacting concrete on three sides of the beam. Results for the modulus of elasticity, compressive strength, breaking toughness, and water permeability results obtained from laboratory sample testing will also be provided.