Effect of bond degradation due to corrosion – a literature survey

Mancini, Giuseppe; Tondolo, Francesco

doi:10.1002/suco.201300009

Cited by 73 publications

(51 citation statements)

References 22 publications

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“…The bond reduction due to corrosion of reinforcing bars in concrete has also been the subject of investigation over recent decades [5,7,[11][12][13][14][15][16]. Most studies apply accelerated corrosion techniques [17] to achieve a specific state of corrosion before the bond properties are assessed. The obtained results show a significant amount of scatter, but do agree on a bond reduction for significant levels of corrosion.…”

Section: Introductionmentioning

confidence: 99%

Bond behaviour of reinforcing bars in cracked concrete

Desnerck

Lees

Morley

2015

Construction and Building Materials

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h i g h l i g h t sA novel method to test bond in cracked reinforced concrete specimens is presented. Effect of number of cracks, orientation, confinement and cover is investigated. Results indicate a significant loss of bond strength for single cracked specimens. Concrete cover and confinement play a significant role. Crack orientation with respect to the rib pattern is of minor influence. a b s t r a c tDue to the relatively low tensile strength of concrete, cracks are inherent in reinforced concrete structures. A common cause of cracking is the corrosion of internal steel reinforcement, a deterioration process that can affect the bond behaviour and anchorage capacity of reinforcing bars. Corrosion leads to a reduction of the reinforcing bar diameter, the formation of a weak layer of corrosion products around the bar and expansive forces on the surrounding concrete (that can lead to cracking). In the past, the impact of corrosion on bond has been investigated by means of accelerated corrosion tests. However, the more fundamental impact of cracking as distinct from corrosion products on the bond reduction is still not fully understood.This study applies a novel test method to investigate the bond behaviour of reinforcing bars in cylindrical cracked reinforced concrete specimens. The influence of the number of cracks, crack orientation, confinement and concrete cover are investigated.The results indicate a significant loss of bond strength for single cracked specimens. This reduction becomes as high as 65% for double cracked specimens in the absence of confinement. It is shown that the crack orientation with respect to the rib pattern is of minor influence, but the concrete cover and confinement play a significant role in the obtained bond characteristics.

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Section: Introductionmentioning

confidence: 99%

Bond behaviour of reinforcing bars in cracked concrete

Desnerck

Lees

Morley

2015

Construction and Building Materials

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“…Some experimental tests are reported hereafter without the aim of being exhaustive. A more detailed literature survey on corrosion tests can be found in Saether [1] and some critical aspects have been discussed in Mancini and Tondolo [9].…”

Section: Previous Experimental Investigationsmentioning

confidence: 99%

“…elements performed in the past by the same Author [8]. The chosen level of current density, as discussed in Mancini and Tondolo [9], can be considered as the upper limit of the current density level for accelerated corrosion procedures. The electrical current was applied directly to both the longitudinal bar and stirrups in order to simulate the actual conditions encountered on corroded r.c.…”

Section: Test Proceduresmentioning

confidence: 99%

“…In order to extend the knowledge on the bond in the presence of corrosion, tests have been performed with a specific setup: a low current density of 200 lA/cm 2 , as suggested in Mancini and Tondolo [9], unconfined compared with confined test specimens with corroded transverse reinforcement and tests performed with a corrosion level up to 20%.…”

Section: Introductionmentioning

confidence: 99%

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Bond behaviour with reinforcement corrosion

Tondolo

2015

Construction and Building Materials

125

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“…Different issues can be addressed to corrosion of steel reinforcement in concrete: the reduction of the cross section of rebar together with the yielding and ultimate strength level and ductility of steel in the residual cross section, the loss of bond between steel and concrete, and the loss of bearing capacity of cracked concrete around corroding steel, due to the expansion of the oxides, other than as an extreme consequence the spalling and delamination of the cover [1][2][3]. ese effects are responsible for the reduction of the performance of both RC and PC structures in service other than at ultimate conditions.…”

Section: Introductionmentioning

confidence: 99%

A Model for the Analysis of Ultimate Capacity of RC and PC Corroded Beams

Recupero

Spinella

Tondolo

2018

Advances in Civil Engineering

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Corrosion of steel in reinforced and prestressed concrete beams is very common for structures and infrastructures. It can drastically reduce the resisting section of rebar, modify the mechanical response of the steel rebar, and also determine cracking of the surrounding concrete because of the volume expansion effect of rust. Moreover, it heavily influences the bond between steel rebar and concrete. Few experimental tests are available in the literature, where the structural behavior of reinforced and prestressed concrete beams, in presence of corrosion of longitudinal and transversal reinforcement, is analyzed. A reduction of the bearing performance is observed with an increasing level of rebar corrosion. Indeed, a changing collapse mechanism is evidenced through the tests and may be addressed to the not obvious consequences of corrosion. In this paper, a physical model based on a consistent equilibrium and ultimate strength theory is employed in order to explain the residual capacity of corroded beams. e model is based on limit analysis, and it is able to take into account the interaction between shear, bending moment, and axial forces.

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Effect of bond degradation due to corrosion – a literature survey

Cited by 73 publications

References 22 publications

Bond behaviour of reinforcing bars in cracked concrete

Bond behaviour of reinforcing bars in cracked concrete

Bond behaviour with reinforcement corrosion

A Model for the Analysis of Ultimate Capacity of RC and PC Corroded Beams

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