Evaluation of corrosion resistance of different steel reinforcement types

Phares, Brent; Fanous, F.; Wipf, T J; Lee, Yoon-Si; Jolley, Milan J.

doi:10.31274/rtd-20201107-197

Cited by 2 publications

(1 citation statement)

References 6 publications

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“…(4 Surface chloride concentrations are expected to increase over time. Chloride concentration rises quickly and peaks at a given depth of concrete cover from the surface (Phares et al 2006). The diffusion coefficient of UHPC is from a FHWA study (1.3 × 10 − 13 m2 /s or 3.15 mm2/year) (Federal Highway Administration (FHWA) 2019).…”

Section: Defining Data Input For Monte Carlo Simulationmentioning

confidence: 99%

Modeling life expectancy and cost effectiveness for UHPC bridge retrofitting techniques

Hossain,

Chang

2024

ABEN

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Bridge components are subject to both structural loads and environmental stressors, rendering them susceptible to accelerated deterioration and potential collapse in the absence of effective maintenance and rehabilitation strategies. Moreover, the phenomenon of wet-dry cycling, coupled with elevated chloride concentrations prevalent in coastal regions, further expedites the degradation process of bridges, thereby escalating maintenance frequency and repair costs. In response to this challenge, the integration of innovative materials such as Ultra High-Performance Concrete (UHPC) is being explored for the development and implementation of maintenance and rehabilitation strategies. This study presents a comparative analysis between conventional methods and UHPC applications for bridge repairs, utilizing Life Cycle Cost Analysis (LCCA) to encompass both agency and user costs, and applies Monte Carlo simulation to account for the variability of the modeling factors. A practical case study illustrates the applicability of the LCCA methodology, revealing that the utilization of UHPC contributes to a reduction in the total life cycle cost for bridge maintenance and rehabilitation. Life expectancy, Average Daily Traffic (ADT), and the duration of construction activities during rehabilitation emerge as the most influential factors affecting life cycle costs. The main contributions of the study are the development of the life-expectancy model and step-by-step Life-Cycle Cost Analysis (LCCA) methodology. Findings from this study aim to identify cost-effective retrofitting techniques for maintaining bridges in a “State of Good Repair.”

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Section: Defining Data Input For Monte Carlo Simulationmentioning

confidence: 99%

Modeling life expectancy and cost effectiveness for UHPC bridge retrofitting techniques

Hossain,

Chang

2024

ABEN

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Reinforcement Steel Corrosion Reduction by Using Fly Ash from South Baghdad Power Plant

Merzah¹,

Kalifa²,

Abood³

et al. 2013

IJCPE

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Corrosion- induced damage in reinforced concrete structure such as bridges, parking garages, and buildings, and the related cost for maintaining them in a serviceable condition, is a source of major concern for the owners of these structures.Fly ash produced from south Baghdad power plant with different concentrations (20, 25 and 30) % by weight from the cement ratio were used as a corrosion inhibitor as a weight ratio from the cement content.The concrete batch ratio under study was (1:1.5:3) cement, sand and gravel respectively which is used in Iraq. All the raw materials used were locally manufactured.Concrete slabs (250x250x70) mm dimensions were casted, using Poly-wood molds. Two steel bars were embedded in the central position of each slab at the mid- height (about 35 mm), with a space of 100 mm between each other.A 16 concrete slabs were prepared (0, 20, 25 and 30) wt. % of fly ash. The specimens were partially immersed in 3.5 wt. % NaCl solution in order to predict the corrosion.Half-cell potential test technique was used to estimate the corrosion rate which is occurred in the steel bar due to the migration of chloride ions through the concrete, depending on the ASTM C876-08.The result shows that the potential values of steel in concrete were shifts to the positive direction with increasing the percentage of fly ash, because the reduction of porosity by the addition of fly ash which fill the pores and inhibit the chloride ions to reach to steel.The results also show that the further increase of fly ash (30%) the possibility of carbonation is increased which result in reduction its alkalinity, thereby permitting corrosion of embedded steel.

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Evaluation of corrosion resistance of different steel reinforcement types

Cited by 2 publications

References 6 publications

Modeling life expectancy and cost effectiveness for UHPC bridge retrofitting techniques

Modeling life expectancy and cost effectiveness for UHPC bridge retrofitting techniques

Reinforcement Steel Corrosion Reduction by Using Fly Ash from South Baghdad Power Plant

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