Evaluation of Additional Protection Methods to Control Reinforcement Corrosion

Bolzoni, F.; Beretta, Silvia; Brenna, Andrea; Diamanti, Maria Vittoria; Lazzari, Luciano; Ormellese, Marco; Pedeferri, MariaPia

doi:10.4028/www.scientific.net/kem.711.37

Cited by 4 publications

(5 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In real cases, the behavior of reinforcement, concrete, and/or the environment may vary depending on design and execution. The results of the probabilistic method were also presented in [33].…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Evaluation of Preventative Methods against Rebar Corrosion in Concrete

Bolzoni

Brenna

Beretta

et al. 2022

KEM

Self Cite

View full text Add to dashboard Cite

Prevention of rebar corrosion is achieved in the design and construction phases, by means of suitable mix design, casting and curing, and adequate cover depth; this approach have been introduced in international standards (EN 206) and design codes (Eurocode 2). Additional protection methods (cathodic protection, stainless steel or galvanised rebars, corrosion inhibitors, concrete coatings) can be used in very aggressive environment, especially in presence of chlorides, or when increased service life is required. In this work a simplified performance-based approach, based on Monte Carlo simulation, has been used to evaluate the service life (initiation time of corrosion) in chloride containing environments. The results confirmed that cathodic prevention and stainless steels are the most effective protection methods to guarantee a safe working condition in a severe environment. The use of pozzolanic or slag cement is confirmed as an effective way to slow chloride transport and by this way to increase the service life.

show abstract

Section: Resultsmentioning

confidence: 99%

“…Figure 4. Cumulative distribution of the service life: exposure class XS3, mean cover 45 mm (left) 60 mm (right)[33] …”

mentioning

confidence: 99%

Evaluation of Preventative Methods against Rebar Corrosion in Concrete

Bolzoni

Brenna

Beretta

et al. 2022

KEM

Self Cite

View full text Add to dashboard Cite

show abstract

“…Monte Carlo simulation was applied to evaluate the distribution of the initiation time of corrosion. The complete results of these analyses are reported in previous papers 38–39 here the methodology and main results are summarized. The use of coatings is compared with concrete manufactured with CEM III and other additional protection methods, like stainless steel rebars or corrosion inhibitors.…”

Section: Effect Of Concrete Coatings On Service Lifementioning

confidence: 99%

“…Cumulative distribution of the failure probability: Example of calculation by means of Monte Carlo simulation: exposure class XS3, mean cover 45 mm (left), exposure class XS1, mean cover 35 mm (right), parameters of the distributions in Tables 8 (adapted from References 38 and 39) …”

Section: Effect Of Concrete Coatings On Service Lifementioning

confidence: 99%

Effect of polymer modified cementitious coatings on chloride‐induced corrosion of steel in concrete

Brenna

Beretta

Berra

et al. 2019

Structural Concrete

Self Cite

View full text Add to dashboard Cite

The paper deals with the study of the effect of polymer modified cementitious mortars on chloride-induced corrosion of steel reinforcement in concrete. Nowadays, many results obtained by standard and short-term tests are available in the literature. The paper reports more than 15 years exposure testing on two commercial coatings, with different polymer/cement ratio. The effect of coatings on corrosion initiation and propagation has been studied by the monitoring of corrosion potential and corrosion rate of rebars in concrete subjected to chloride ponding; chloride profiles, coating adhesion, water content, and corrosion morphology have been also analyzed. It was demonstrated that polymer modified cementitious mortars can delay corrosion initiation caused by chloride penetration into concrete. Owing to high resistivity of coated concrete, corrosion rate is reduced. The protective effect is more pronounced as the polymer content increases from 0.35 to 0.55. The results have been elaborated to estimate the possible increase of service life gained with this additional protection method, compared with other solutions. K E Y W O R D S chlorides diffusion, concrete coatings, corrosion of reinforcements 1 | INTRODUCTION Rebar corrosion is one of the most important cause of premature failure of reinforced concrete structures. Steel reinforcements in concrete are in passive conditions, protected by a thin oxide layer, promoted by the concrete alkalinity. 1,2 Depassivation may occur because of concrete carbonation, due to the reaction of atmospheric carbon dioxide with cement paste that lowers pH and causes general corrosion, and by the presence of chlorides in concentration higher than a critical level, that is generally considered in the range of 0.4-1% by cement weight for concrete structures exposed to atmosphere. 1 Chlorides can be added erroneously into concrete through mixing water or aggregates or they can penetrate from external sources, by diffusion or capillary suction, for example, in highway viaducts where de-icing salts are used, or in marine structures. 1 The prevention of reinforcement corrosion is primarily achieved in the design phase by using high quality concrete, adequate concrete cover, and suitable casting and curing procedures. 3,4 Additional prevention methods are adopted when severe environmental conditions occur

show abstract

“…For example, Nielsen et al [ 8 , 9 ], proposed that high dose CP is needed to prevent direct current (DC) interference and low CP can effectively protect steel from AC corrosion. In addition, a four-month field test conducted by Ormellese et al [ 10 ] concluded that overprotection is the most dangerous condition for AC corrosion.…”

Section: Introductionmentioning

confidence: 99%

Effect of Alternating Current on the Cathodic Protection and Interface Structure of X80 Steel

Wang

et al. 2017

Materials

View full text Add to dashboard Cite

This study employs potential-monitoring techniques, cyclic voltammetry tests, alternating current (AC) voltammetry methods, and surface characterization to investigate the AC corrosion of cathodically protected X80 pipeline steel. In a non-passive neutral solution at pH 7.2, a sufficiently negative potential completely protects steel at an AC current density of 100 A/m2. In an alkaline solution at pH 9.6, more serious AC corrosion occurs at more negative cathodic protection (CP) potential, whereas without CP the steel suffers negligible corrosion. In addition, the interface capacitance increases with AC amplitude. Based on these results, the AC corrosion mechanisms that function under various conditions are analyzed and described.

show abstract

Evaluation of Additional Protection Methods to Control Reinforcement Corrosion

Cited by 4 publications

References 17 publications

Evaluation of Preventative Methods against Rebar Corrosion in Concrete

Evaluation of Preventative Methods against Rebar Corrosion in Concrete

Effect of polymer modified cementitious coatings on chloride‐induced corrosion of steel in concrete

Effect of Alternating Current on the Cathodic Protection and Interface Structure of X80 Steel

Contact Info

Product

Resources

About