Monitoring system for the penetration of chlorides, carbonation and the corrosion risk for the reinforcement

Raupach, Michael; Schießl, P

doi:10.1016/s0950-0618(97)00039-1

Cited by 46 publications

(19 citation statements)

References 2 publications

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“…As reported in the literature 14,21 , these results also evidence the importance of the thickness in the SL of RC, showing that a variation of 10 mm in this protective layer may considerably reduce the SL.…”

Section: States Of the Systemsupporting

confidence: 86%

Markov Chains and reliability analysis for reinforced concrete structure service life

Possan

Andrade

2014

Mat. Res.

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From field studies and the literature, it was found that the degradation of concrete over time can be modelled probabilistically using homogeneous Markov Chains. To confirm this finding, this study presents an application of Markov Chains associated with the reliability analysis of experimental results of the degradation of concrete by chlorides. Experimental results were obtained for chloride penetration originating from non-accelerated tests in concretes in which the water/binder ratio was variable (0.40, 0.50 and 0.60) and that were produced with Pozzolanic Portland cement that was exposed for six months to the action of NaCl. Using a simulation process, the failure and safety probabilities were calculated by reliability and using Markov Chains, a service life project was estimated (a period of corrosion initiation). Compared to a concrete structure itself, the average error of service life predicted using Markov was approximately 14%. The results show a promissory methodology, in combination with the determination of concrete cover thickness, according to the required service life.

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Section: States Of the Systemsupporting

confidence: 86%

Markov Chains and reliability analysis for reinforced concrete structure service life

Possan

Andrade

2014

Mat. Res.

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“…The two electrodes should be close to each other in order to reduce the ohmic drop and to maximise the macrocell current. Devices based on the measurement of macrocell currents have been proposed to detect the penetration of chlorides in concrete: different electrodes are placed in the concrete cover at increasing depths and when, as a consequence of chloride penetration, corrosion initiates on the most external electrode, a macrocell current is detected between the electrode and a passive electrode (anode-ladder system [31]). Figure 14 shows an example of the macrocell current measured between a steel anode and a stainless steel cathode following chloride penetration in the 5 mm cover of specimens made with two different concretes, one with water/cement ratio of 0.7 and another with w/c of 0.6.…”

Section: Macrocell Testsmentioning

confidence: 99%

“…Figure 14 shows an example of the macrocell current measured between a steel anode and a stainless steel cathode following chloride penetration in the 5 mm cover of specimens made with two different concretes, one with water/cement ratio of 0.7 and another with w/c of 0.6. In the more porous concrete, where chloride penetration occurred easily, the steel anode underwent corrosion initiation as indicated by the increase of the macrocell current, from negligible values to values of about 20 mA [31]. Although this device does not allow an independent quantification of the chloride threshold, it allows to detect or estimate the time for depassivation of steel reinforcement in a non-destructive way.…”

Section: Macrocell Testsmentioning

confidence: 99%

Depassivation of steel reinforcement in case of pitting corrosion: detection techniques for laboratory studies

Bertolini

Redaelli

2009

Materials & Corrosion

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Methods for service life prediction of reinforced concrete structures exposed to chloride‐bearing environments require, amongst other parameters, the knowledge of the chloride threshold for pitting corrosion initiation (Clth). Nowadays, although the main factors influencing the chloride threshold are well known, it is often difficult to quantify a value of the chloride threshold, partly because of its intrinsic high variability, and partly because of the different test methods that have been used to measure it. All the experimental tests rely on the detection of steel depassivation and simultaneous measurement of chloride content or steel potential. This paper deals with the methods that can be used to detect steel depassivation in relation with the determination of the chloride threshold. Tests in concrete‐pore‐simulating solutions as well as tests in concrete will be considered, and advantages and limitations will be discussed.

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“…If the corrosion process can be detected early, deterioration of the bridge can be reduced significantly hence the maintenance cost is reduced. Corrosion monitoring system has been developed by Raupach and Schiessl [3] which permanently monitor the corrosion risk for the reinforcement in concrete structure. These systems enable the owner to take preventive action before damage occurs.…”

Section: Introductionmentioning

confidence: 99%

“…These systems enable the owner to take preventive action before damage occurs. Based on electrochemical principles on corrosion process, Raupach and Schiessl [3] have developed a method to determine penetration of threshold chloride content. Stainless steel or platinum coated titanium act as cathode and reinforced steel electrodes embedded at various depth will act as anode.…”

Section: Introductionmentioning

confidence: 99%

A Bayesian Approach for Structural Health Monitoring of Concrete Bridge

Anuar¹,

Ghazali²,

Khairunisa³

2015

International Conference on Architecture, Structure and Civil Engineering (ICASCE-15) Sept. 7-8, 2015 Antalya (Turkey)

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Monitoring system for the penetration of chlorides, carbonation and the corrosion risk for the reinforcement

Cited by 46 publications

References 2 publications

Markov Chains and reliability analysis for reinforced concrete structure service life

Markov Chains and reliability analysis for reinforced concrete structure service life

Depassivation of steel reinforcement in case of pitting corrosion: detection techniques for laboratory studies

A Bayesian Approach for Structural Health Monitoring of Concrete Bridge

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