Service life of RC structures: chloride induced corrosion: prescriptive versus performance-based methodologies

Marques, Pedro; Costa, A.; Lanata, Francesca

doi:10.1617/s11527-011-9765-2

Cited by 34 publications

(12 citation statements)

References 11 publications

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Section: Comparison and Validationmentioning

confidence: 99%

“…Due to the fact that the influence of seawater pressure on the diffusion of chloride ion within the high performance concretes (HPC) which is frequently used in marine submerged zone is unobvious, 26 k v takes 1.0 in this paper. k T takes values of 2.2, 1.5, 1.2, 1.0, 0.8, 0.7, and 0.6, corresponding to the surface temperature of concrete of 0, 10, 15, 20, 25, 30, and 35 C, respectively, as presented by Marques, et al 8 The test data of concrete specimens exposed to marine submerged zone reported by Markeset and Skjølsvold 16 and Tang, 18 Fan et al 19 , and Dousti et al, 21 as illustrated in Table 1, were adopted to validate of the proposed two-phase nonlinear regression technique and the proposed multifactor computational model (e.g., Equation (23)) by comparing with the DuraCrete model (e.g., Equation (24)) and the LNEC model (e.g., Equation (25)), as shown in Figure 4. The results of the DuraCrete model and the LNEC model scatter far away from the equality line (most points locate on the left side), which implies that the computational results of the DuraCrete model and the LNEC model usually overestimate C s,sub comparing with the test data.…”

Section: Comparison With Existing Computational Modelsmentioning

confidence: 99%

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Modeling of environmental action for submerged marine concrete in terms of surface chloride concentration

Yang

Cai

2018

Structural Concrete

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Surface chloride concentration (SCC) of concrete is an important measure for marine environmental action on oceanic concrete engineering. However, existing models of the SCC could not estimate accurately the chloride attack on concrete exposed to submerged marine environment, as they only involve part of the main influential factors. A quantitative multifactor model for environmental action of submerged marine concrete was developed in terms of the SCC in this study. First, the water‐to‐binder ratio, binder type, chloride concentration of seawater, and exposure time were investigated and adopted as major factors in the computation model of the SCC for submerged marine concrete. The two‐phase multiple nonlinear regression technique was proposed for evaluation of the correction factors for different binder type as well as undetermined coefficients. Then a multifactor computational model for the SCC of submerged marine concrete was developed on the basis of a large number of collected test data. Finally, the effectiveness and advantages of the proposed multifactor model for the SCC were demonstrated by comparison with existing models and test data.

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Section: Comparison and Validationmentioning

confidence: 99%

Section: Comparison With Existing Computational Modelsmentioning

confidence: 99%

Modeling of environmental action for submerged marine concrete in terms of surface chloride concentration

Yang

Cai

2018

Structural Concrete

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“…The acceptable probability should be selected on the basis of the severity of the adverse event occurring (limit state), although this task is not simple. Design equations, correction parameters, and limitations of the model can be found in the literature (Ferreira, 2012;Fib, 2006;Lollini, Redaelli, & Bertolini, 2012;Marques, Costa, & Lanata, 2012;Vorěchovská, Teplý, & Chromá, 2010). To show the possible use of these performance-based model, Figure 8 shows an example of calculation of the probability of failure for the splash zone of a marine structure for which a design service life of 100 years is required.…”

Section: Prevention Provided By the Concrete Covermentioning

confidence: 99%

Corrosion of Steel in Concrete and Its Prevention in Aggressive Chloride-Bearing Environments

Bertolini¹,

Carsana²,

Gastaldi³

et al. 2016

Proceedings of the 5th International Conference on the Durability of Concrete Structures

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This keynote paper deals with the durability of reinforced concrete (RC) structures exposed to aggressive environments characterized by high concentration of chloride ions, namely, marine environments or the use of de-icing salts. The mechanism of chloride-induced corrosion of steel in concrete is introduced, and its influence on the service life of RC structures is analyzed. Factors affecting the time to corrosion initiation are described with regard to both concrete properties and environmental exposure conditions. Design approaches available for achieving durability targets associated with the design service life are analyzed, focusing on studies carried out by the authors in recent years at the mCD Concrete Durability lab of Politecnico di Milano, which were aimed at improving the protection provided to the steel bars by the concrete cover, investigating the advantages of using corrosion-resistant stainless steel bars and developing the electrochemical technique of cathodic prevention.

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“…As previously mentioned, the probabilistic method is based on the equations and parameters defined in the specification LNEC E 465 (2007). However, the design lifetime results t are calculated taking into consideration the mean values of the random variables (Table 7) 2010; Lindvall, 2003;Marques, Costa, & Lanata, 2010). The CoV of the model uncertainty was assumed in view of what some authors considered (Val & Trapper, 2008).…”

Section: Input Variables Of the Pro6o6i/istic Approachmentioning

confidence: 99%

Lifetime modelling of chloride-induced corrosion in concrete structures with Portland and blended cements

Faustino

Chastre

Nunes

et al. 2016

Structure and Infrastructure Engineering

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This article discusses mathematical modelling of the long-term performance of concrete with different supplementary cementitious materials in a maritime environment. The research was carried out in the light of the national Portuguese application of the CEN standards with mandatory requirements for a performance-based design approach. Laboratory investigations were performed on concrete compositions based on CEM I and CEM II/B-L in which the cement was partially replaced by either 0% (reference composition) or 50% of low calcium fly ash (FA). Concrete compositions were made with the objective to achieve service lives of 50 and 100 years with regard to steel corrosion. Test results of compressive strength, chloride potential diffusion and electrical resistivity are reported for different curing ages of 28, 90, 180 and 365 days. Chloride diffusion results were used for the implementation of modelling equations in order to estimate the design lifetime regarding reinforcing steel corrosion. A performance based approach using a probabilistic method was carried out and the results obtained are compared with the requirements according to the Portuguese prescriptive approach. The modelling results show that FA blended compositions have better performance compared to those with Portland cements, especially if curing ages beyond 28 days are considered.

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Service life of RC structures: chloride induced corrosion: prescriptive versus performance-based methodologies

Cited by 34 publications

References 11 publications

Modeling of environmental action for submerged marine concrete in terms of surface chloride concentration

Modeling of environmental action for submerged marine concrete in terms of surface chloride concentration

Corrosion of Steel in Concrete and Its Prevention in Aggressive Chloride-Bearing Environments

Lifetime modelling of chloride-induced corrosion in concrete structures with Portland and blended cements

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