Influence of the Loading Speed on the Ductility Properties of Corroded Reinforcing Bars in Concrete

Abstract

In this work 144 reinforcing bars of high-ductility steel named B500SD were subjected to an accelerated corrosion treatment and then tested under tension at different loading speeds in order to assess the effect of corrosion on the ductility properties of the rebars. Results showed that the bars with a corrosion level as low as the one reducing the steel mass by 1% gave rise to a significant degradation on the ductility properties when a high loading speed was applied in tensile tests. In that case, the equivalent steel concept is useful to reduce the destabilising effect. Thus, the research significance lies in the assessment of the influence of the loading speed at which the tensile test is performed for the reinforcement bars that largely depends of the ductility criteria used.

Study on Lifetime Performance Evaluation of a Precast Prestressed Concrete Frame in Chloride Environments

“…The corrosion of reinforced concrete structures leads to a notable decline in the mechanical properties of the reinforcing steel, as well as a reduction in the bond strength between the reinforcement and concrete. In recent years, researchers worldwide have conducted extensive experimental investigations into the mechanical properties of corroded steel reinforcement [1][2][3]. The results indicate a significant deterioration in the mechanical properties of steel with increasing degrees of corrosion.…”

The Constitutive Relationship for Corroded Steel Bars: Model and Analysis

“…Simultaneously, its mechanical properties, such as the overall strength and ductility of a corroded steel bar, are heavily impacted by the increase of corrosion degree [8][9][10]. There are many studies on the constitutive characteristics of corroded steel bars, but most of them are based on experimental results to give empirical estimation on the effect of corrosion on the mechanical properties of corroded steel bars [11][12][13][14][15][16]. Owing to the complex and variable appearance of corroded steel bars [17][18][19][20], it is still not fully understood about how various parameters affect the constitutive relation of corroded steel bars.…”