High Performance Concrete and Reinforcing Steel With a 100-Year Service Life

Pfeifer, Donald W.

doi:10.15554/pcij.05012000.46.54

Cited by 17 publications

(2 citation statements)

References 2 publications

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“…Most reinforced concrete structures are expected to service for at least 75 years without major repairs [ 1 ]. However, this is difficult to achieve, not because of a structural problem but a durability issue.…”

Section: Introductionmentioning

confidence: 99%

Passivation Characteristics of Alloy Corrosion-Resistant Steel Cr10Mo1 in Simulating Concrete Pore Solutions: Combination Effects of pH and Chloride

Sun

Jiang

et al. 2016

Materials

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The electrochemical behaviour for passivation of new alloy corrosion-resistant steel Cr10Mo1 immersed in alkaline solutions with different pH values (13.3, 12.0, 10.5, and 9.0) and chloride contents (0.2 M and 1.0 M), was investigated by various electrochemical techniques: linear polarization resistance, electrochemical impedance spectroscopy and capacitance measurements. The chemical composition and structure of passive films were determined by XPS. The morphological features and surface composition of the immersed steel were evaluated by SEM together with EDS chemical analysis. The results evidence that pH plays an important role in the passivation of the corrosion-resistant steel and the effect is highly dependent upon the chloride contents. In solutions with low chloride (0.2 M), the corrosion-resistant steel has notably enhanced passivity with pH falling from 13.3 to 9.0, but does conversely when in presence of high chloride (1.0 M). The passive film on the corrosion-resistant steel presents a bilayer structure: an outer layer enriched in Fe oxides and hydroxides, and an inner layer, rich in Cr species. The film composition varies with pH values and chloride contents. As the pH drops, more Cr oxides are enriched in the film while Fe oxides gradually decompose. Increasing chloride promotes Cr oxides and Fe oxides to transform into their hydroxides with little protection, and this is more significant at lower pH (10.5 and 9.0). These changes annotate passivation characteristics of the corrosion-resistant steel in the solutions of different electrolyte.

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Section: Introductionmentioning

confidence: 99%

Passivation Characteristics of Alloy Corrosion-Resistant Steel Cr10Mo1 in Simulating Concrete Pore Solutions: Combination Effects of pH and Chloride

Sun

Jiang

et al. 2016

Materials

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show abstract

“…Published literature indicated that estimating the length of time between corrosion initiation and spalling is a difficult task. However, a research study suggested using the rate at which a given reinforcement type corrodes as a means to estimate the length of this period (32).…”

Section: Time Between Corrosion Initiation and Spallingmentioning

confidence: 99%