Measurement of corrosion rates on reinforcement using the field test

Reinforcement corrosion is a phenomenon that affects not only the durability and serviceability of the structure itself but the economy of the countries, as well. In many cases, structures and bridges must be repaired or reconstructed as a result of corrosion of the reinforcement. In extreme cases, when maintenance is neglected, it is necessary to completely replace the structures with new ones, even if their planned service lifetime has not been reached - it is not enough to strengthen them or it is economically inefficient. Corrosion of the reinforcement primarily causes a reduction in the cross-sectional resistance of the load-bearing elements by reducing the cross-sectional area of the reinforcement, which means a reduction in the force in the reinforcement that it transmits. For this reason, it is necessary to know the rate of corrosion over time depending on the environment in which the element is located. The paper is focused on the experimental measurements of corrosion losses due to atmospheric corrosion on reinforcement samples using the field test. As a part of experimental measurements, corrosion rates on reinforcements of four diameters (diameters 6, 10, 14, and 25 mm) of steel for reinforcement, grade B 500B, are monitored at measuring stations and bridges in various aggressive environments.This research was supported by Research Projects No. 1/0623/21 of the Slovak Grant Agency

Analysis of the Impact and Mechanical Properties of a Damper Made of Hyperelastic Material

The proof-load tests are an integral part of verifying the actual behaviour of bridge objects. If a new bridge object is put into operation after construction, it is necessary to verify whether it will behave as it was supposed to when it was designed. In the case of existing bridge objects, it may happen that the bridge has malfunctions or behaves unconventionally due to failures - then there may be a need to reconstruct and strengthen the bridge object, and thus again there is a need to verify its behaviour using a proof-load test. The proof-load test can be static or dynamic. The aim of the paper is to point out the inevitability of the proof-load tests for the real and correct behaviour of bridge structures in ultimate limit state and maximum allowable deformations in serviceability limit states. It is necessary to point to the greatest consequences of resistance, reliability, durability and lifetime of the bridge structures. Using the proof-load tests for new bridges is prescribed by the Slovak standard STN 73 6209