Corrosion process and structural performance of a 17 year old reinforced concrete beam stored in chloride environment

Vidal, Thierry; Castel, Arnaud; François, Raoul

doi:10.1016/j.cemconres.2007.08.004

Cited by 201 publications

(69 citation statements)

References 9 publications

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“…In truth, studies performed at the L.M.D.C. Lab (Toulouse) have shown that the influence of cracks on the corrosion process is not significant until the crack width is below 0.3 mm (Vidal et al, 2007). On the contrary, wider cracks markedly modify the diffusion process.…”

Section: Damaging Agents Diffusion In Concrete 231 Carbonation Modelmentioning

confidence: 98%

The influence of degradation phenomena on collapse modes in prestressed concrete beams

Sgambi

Malerba

Gotti

et al. 2012

IJLCPE

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Abstract:The static capacities of reinforced and prestressed concrete beams are characterised through their failure modes, which describe the internal force redistribution as well as the kinematic evolution which leads to the collapse of the structure. For a given structural element, a change in material and/or sectional characteristics due, for instance, to damaging effects induced by environmental aggressive agents, may change the element behaviour. In this paper, a computational approach, suitable to deal with the analysis of R.C. and P.C. concrete elements with steel bars and/or tendons subjected to corrosion is presented. The effects of the diffusion of aggressive agents, of the onset and of the development the corrosion state in the reinforcement and the corresponding mechanical response are studied. The damage development and the mechanical behaviours are dealt as coupled phenomena. A set of comparative applications shall demonstrate how in P.C. beams, the corrosion could switch a collapse of flexural type to one of shear type.

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Section: Damaging Agents Diffusion In Concrete 231 Carbonation Modelmentioning

confidence: 98%

The influence of degradation phenomena on collapse modes in prestressed concrete beams

Sgambi

Malerba

Gotti

et al. 2012

IJLCPE

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“…In addition, if at the flexural crack to be expected to corrosion firstly appears, the phenomenon a self-healing [10] will occurred due to slow down of chlorides migration generated from the crack filling by the corrosion products [11], and corrosion activity will be decreased [12]. This tends to prove that for longitudinal corrosion cracks, there is no self-healing as in the case of flexural cracks [13]. Moreover, longitudinal cracks pattern was found along the beams with maximum crack widths for PC-O-3 showed larger than PC-O-2 with 2.2 mm and 0.5 mm, respectively.…”

Section: Visual Observationmentioning

confidence: 99%

Prestress Loss and Bending Capacity of Pre-cracked 40 Year-Old PC Beams Exposed to Marine Environment

Dasar

Irmawaty

Hamada

et al. 2016

MATEC Web of Conferences

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Abstract. Six prestressed concrete beams (PC beam) were used for evaluation, consist of four post-tension beams (PC-O) and two pre-tension beams (PC-R). In order to investigate the effect of crack on prestress loss and bending capacity after long-term exposed, prestressed concrete beams were pre-crack and then exposed to marine environment. Experimental work was carried out to evaluate PC beams performance after long-term exposed. In addition, visual observations and load bearing capacity test was carried out. Furthermore, evaluation of prestress loss conducted using three-point loading bending test and the remaining tendon forces in the beam were determined using Crack Re-opening Method. The experimental results revealed that prestress loss was increased due to corrosion of strand/wire which affected by the pre-crack on the prestressed beams. Approximately a prestress loss around 26% and 30% was recorded for post-tension and pre-tension beams respectively.

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“…Montes et al [13] and Ohno et al [14] found that the width of the crack influenced the corrosion rate up to 0.5 mm and that, in cracked concrete elements, the corrosion rate was 10 times higher than in uncracked elements. Through a long-time exposure experiment for beam samples, however, François and Arliguie [15]and Vidal et al [16] concluded that the appearance of transverse cracks and the crack width (no more than 0.5 mm) had a minimal effect on the corrosion process of reinforced concrete elements. Jaffer and Hansson [17] found that corrosion only occurred on the rebar surface in the vicinity of the transverse cracks in cracked reinforced concretes when exposed to chlorides and that the uncracked regions far from the transverse cracks were usually passive.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Crack Width on Chloride-Induced Corrosion of Steel in Concrete

Liu

Wang

2017

Advances in Materials Science and Engineering

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When subjected to loading or thermal shrinkage, reinforced concrete structures usually behave in a cracking state, which raises the risk of bar corrosion from the working environment. The influence of cover cracking on chloride-induced corrosion was experimentally investigated through a 654-day laboratory test on cracked reinforced concrete specimens exposed to chloride solution. The concrete specimens have a dimension of 100 mm × 100 mm × 400 mm and a single prefabricated crack at the midspan. When the percentage concentration of chloride ion (0.6%, 1.2%, 2.1%, 3.0%, and 6.0%) and crack width (uncracked, 0.2, 0.3, 0.4, and 0.5 mm) are taken as variables, the experimental results showed that the corrosion rates for cracked specimens increased with increasing percentage concentration of chloride and increasing crack width. This study also showed the interrelationship between crack width and percentage concentration of chloride on the corrosion rate. In addition, an empirical model, incorporating the influence of the cover cracking and chloride concentration, was developed to predict the corrosion rate. This model allows the prediction of the maximum allowable cr based on the given percentage concentration of chloride in the exposure condition.

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Corrosion process and structural performance of a 17 year old reinforced concrete beam stored in chloride environment

Cited by 201 publications

References 9 publications

The influence of degradation phenomena on collapse modes in prestressed concrete beams

The influence of degradation phenomena on collapse modes in prestressed concrete beams

Prestress Loss and Bending Capacity of Pre-cracked 40 Year-Old PC Beams Exposed to Marine Environment

The Effect of Crack Width on Chloride-Induced Corrosion of Steel in Concrete

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