Influence of Chloride Corrosion on Probabilistic Assessment of Bearing Capacity of Beamless Slabs Overlap

Abstract

Abstract The impact of aggressive environment on reinforced concrete beamless slabs leads to corrosion in the structure. This significantly affects the safety, durability and usability of buildings and structures. The bearing capacity of the construction of the beamless slab decreases with time. The more corroded the section of reinforcement in concrete, the greater the likelihood that the destruction of the reinforced concrete slab will occur earlier than the maximum service life of the structure. Various states of the design of a beamless slab in time, affecting the reliability of the structure, are considered. The destruction of the protective layer of concrete and the reduction of the diameter of the working reinforcement significantly affect the bearing capacity and reliability of the beamless slab. Reducing the area of working reinforcement and increasing the volume of corrosion products is an important parameter. The model of steel reinforcement weight loss over time is analysed. The dependence of the increase in the weight of corrosion products over time is revealed, and it is calculated that after 35 years with a complete loss of the thickness of the protective layer of concrete in the structure, the weight of the corrosion products will be 15% of the total mass of steel reinforcement. According to the results of the calculation, it was obtained that during the operation of a reinforced concrete beamless slab in a slightly aggressive environment under chloride corrosion, destruction will occur after 38 years if measures are not taken to inspect and repair it. These values are used for a probabilistic assessment of the effect of corrosion on the bearing capacity of the structure data.