Mechanism of corrosion protection in reinforced concrete marine structures

Page, Christopher

doi:10.1038/258514a0

Cited by 241 publications

(100 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…-is considered to be the main contributor [43]. When such outward diffusion occurs in PC concrete, Ca(OH) 2 would dissolve in the pore solution to buffer its alkalinity [44]. This explains the reason for a constant pH value in the PC concrete at different depths.…”

Section: Slump and Compressive Strengthmentioning

confidence: 99%

Chloride transport and the resulting corrosion of steel bars in alkali activated slag concretes

et al. 2015

View full text Add to dashboard Cite

As the relative performance of alkali activated slag (AAS) concretes in comparison to portland cement (PC) counterparts for chloride transport and resulting corrosion of steel bars is not clear, an investigation was carried out and the results are reported in this paper. The effect of alkali concentration and modulus of sodium silicate solution used in AAS was studied. Chloride transport and corrosion properties were assessed with the help of electrical resistivity, non-steady state chloride diffusivity, onset of corrosion, rate of corrosion and pore solution chemistry. It was found that: (i) although chloride content at surface was higher for the AAS concretes, they had lower chloride diffusivity than PC concrete; (ii) pore structure, ionic exchange and interaction effect of hydrates strongly influenced the chloride transport in the AAS concretes; (iii) steel corrosion resistance of the AAS concretes was comparable to that of PC concrete under intermittent chloride ponding regime, with the exception of 6 % Na 2 O and Ms of 1.5; (iv) the corrosion behaviour of the AAS concretes was significantly influenced by ionic exchange, carbonation and sulphide concentration; (v) the increase of alkali concentration of the activator generally increased the resistance of AAS concretes to chloride transport and reduced its resulting corrosion, and a value of 1.5 was found to be an optimum modulus for the activator for improving the chloride transport and the corrosion resistance.

show abstract

Section: Slump and Compressive Strengthmentioning

confidence: 99%

Chloride transport and the resulting corrosion of steel bars in alkali activated slag concretes

et al. 2015

View full text Add to dashboard Cite

show abstract

“…Already in 1959 Bäumel [58] described that Ca(OH) 2 surrounds the steel in concrete, and in 1975 Page [59] documented the presence of a dense, limerich layer of hydration products on the surface of steel in cementitious material. Page suggested that the Ca(OH) 2 might buffer the pH in the pore solution and act as a physical barrier.…”

Section: Concrete Microstructure and Chemistrymentioning

confidence: 99%

The steel–concrete interface

et al. 2017

View full text Add to dashboard Cite

Although the steel-concrete interface (SCI) is widely recognized to influence the durability of reinforced concrete, a systematic overview and detailed documentation of the various aspects of the SCI are lacking. In this paper, we compiled a comprehensive list of possible local characteristics at the SCI and reviewed available information regarding their properties as well as their occurrence in engineering structures and in the laboratory. Given the complexity of the SCI, we suggested a systematic approach to describe it in terms of local characteristics and their physical and chemical properties. It was found that the SCI exhibits significant spatial inhomogeneity along and around as well as perpendicular to the reinforcing steel. The SCI can differ strongly between different engineering structures and also between different members within a structure; particular differences are expected between structures built before and after the 1970/1980s. A single SCI representing all on-site conditions does not exist. Additionally, SCIs in common laboratory-made specimens exhibit significant differences compared to engineering structures. Thus, results from laboratory studies and from practical experience should be applied to engineering structures with caution. Finally, recommendations for further research are made. This report was prepared by the working group within RILEM TC 262-SCI, and further reviewed and approved by all members of the RILEM TC 262-SCI.

show abstract

“…(b) The presence of a dense, lime rich layer of hydration prod ucts in the steel concrete interface [32], which can hinder the attack. (c) The difficulty for oxygen diffusion is different in mortar than in solution and it often limits the corrosion rate [33].…”

Section: Introductionmentioning

confidence: 99%

Corrugated stainless steels embedded in mortar for 9years: Corrosion results of non-carbonated, chloride-contaminated samples

Bautista

Paredes

Velasco

et al. 2015

Construction and Building Materials

View full text Add to dashboard Cite

Institutional RepositoryThis is a postprint version of the following published document:A. Bautista (et al.). HI GHLIGHTS• 5 corrugated stainless steel grades are studied in chloride contaminated mortars.• Ecorr and E IS are used for monitoring, and polarizations tests are also carried out • Spo ntaneous corrosion only appears in low Ni austenitic 520430 at partial immersion.• 532205 duplex does not show any sign of corrosion even at anodic high polarizations. ABSTRA C T Keywords: Stainless steel Steel reinforced mortar EISMortar sampl es reinforced with 5 different corrugated stainless steels were tested for 9 years in 2 differ ent conditions: partial immersion (P I) in 3. 5% NaC l, and chloride addition to the mortar and exposure to high relative humidity (H R H) . The monitoring during the exposures was carried out with corrosi on potential (Ecorr) and electrochemical impedance spectroscopy (E IS) measurements. A year before finishing (after 8 years of exposure), the reinforced mortar samples were anodically polarised to obtain more infor mation about the pitting resistance of the passi ve layers formed under the different conditions. The last year of exposure was established to study the pr ogress or repassivation of the pits. The P I is the most aggressive testing condition and it causes low intensity corrosion in 520430 austenitic stainless steel after 7 years of exposure. The 532205 duplex stainless steel shows very good corrosion behaviour.

show abstract

Mechanism of corrosion protection in reinforced concrete marine structures

Cited by 241 publications

References 2 publications

Chloride transport and the resulting corrosion of steel bars in alkali activated slag concretes

Chloride transport and the resulting corrosion of steel bars in alkali activated slag concretes

The steel–concrete interface

Corrugated stainless steels embedded in mortar for 9years: Corrosion results of non-carbonated, chloride-contaminated samples

Contact Info

Product

Resources

About