Bond of naturally corroded, plain reinforcing bars in concrete
Artikel i vetenskaplig tidskrift, 2020

In the past, reinforced concrete structures were built utilising plain reinforcement bars. Currently, this construction method is seldom considered by codes and research; however, many heritage structures are still standing and in need of proper assessment. In particular, there is a lack of knowledge on the effect of corrosion on the bond between concrete and plain reinforcement bars. To address this gap, pullout tests were performed on reinforced concrete specimens sourced from a decommissioned bridge originally constructed in 1935. The specimens were naturally corroded, as the use of accelerated corrosion techniques in structural tests is still debated. A total of 156 pullout tests were conducted on specimens with varying thicknesses. The pullout force, active and passive slip, and corrosion levels were measured. The effect of corrosion on the bond strength, and the amount of visible damage owing to the presence of corrosion products, were influenced by the casting position of the reinforcing bars. The presence of stirrups influenced the post-peak behaviour, increased the residual bond strength, and helped maintain the bond strength in the presence of cracks and spalling damage. Additionally, current code provisions were found to provide conservative values for the peak bond stress of plain reinforcing bars.

natural corrosion

plain reinforcing bars

existing structures

pullout tests

Reinforced concrete

bond strength

Författare

Samanta Robuschi

Chalmers, Arkitektur och samhällsbyggnadsteknik, Konstruktionsteknik

Jakob Sumearll

University of Washington

Ignasi Fernandez

Chalmers, Arkitektur och samhällsbyggnadsteknik, Konstruktionsteknik

Karin Lundgren

Chalmers, Arkitektur och samhällsbyggnadsteknik, Konstruktionsteknik

Structure and Infrastructure Engineering

1573-2479 (ISSN) 1744-8980 (eISSN)

Vol. In Press

Ämneskategorier

Husbyggnad

Korrosionsteknik

DOI

10.1080/15732479.2020.1768273

Mer information

Senast uppdaterat

2020-08-25