Tests on anchorage of naturally corroded reinforcement in concrete

Abstract

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Corrosion propagation phase and bond strength degradation of reinforced concrete structures: State of the art

“…The chemical composition of corrosion products and its escape or penetrate behaviour are the main reasons for above differences. A few studies have been performed to obtain a relation between both accelerated corrosion and natural corrosion [2]. In summary, the acceleration of the corrosion of steel reinforcement has been brought about by an electrochemical method.…”

“…Generally, reinforcing steel and the surrounding concrete area are damaged by corrosion. Finally, it affects both the serviceability and load-carrying capacity of existing reinforced concrete structures [1,2]. Therefore, the understanding and modelling of reinforcing steel corrosion is very important when predicting the service life of reinforced concrete structures.…”

Investigating correlations between crack width, corrosion level and anchorage capacity

“…Twenty-one reinforced concrete beams had in an earlier study been loaded in four-point bending with suspended supports, leading to anchorage failure by splitting induced pullout in all tested specimens. The beams were classified into three damage classes: Reference (R), with no visible surface cracking; Medium damaged (M) with splitting cracks but no spalling; and Highlydamaged (H) with both cracking and spalling of concrete cover; more information is provided in Tahershamsi, Zandi, Lundgren and Plos (2014) and Lundgren, Tahershamsi, Zandi and Plos (2015). In Figure 1 some details of the tested specimens and the used test setup are provided.…”

Evaluation of corrosion level of naturally corroded bars using different cleaning methods, computed tomography, and 3D optical scanning

“…The specimens were taken from the bridge when it was under repair following approximately 30 years of exposure to different natural deterioration phenomena such as corrosion induced by chlorides from deicing salts. In an earlier study, beams were tested in four-point suspended bending tests to obtain anchorage failure [16,17]. Table 1 presents an overview of all specimens included in this study on which different techniques were applied to measure the corrosion level.…”

“…However, most existing studies were conducted under accelerated corrosion conditions. There is a paucity of research examining natural corrosion circumstances due to various difficulties [16][17][18][19].…”