Build a deterministic model that can calculate the time until the first repair of a newly...
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Build a deterministic model that can calculate the time until the first repair of a newly constructed reinforced concrete bridge deck (See Figure). The time until the first repair can be modeled as the time of initiation of chloride-induced corrosion. The diffusion coefficient of the concrete used to construct the bridge deck was measured in the testing lab to be 9.0 x 10¹ m²/s. (a) What is the time to the first repair for the bridge deck? Assume that the concentration of chloride ions [CI] on the road surface is 0.5M and the critical concentration of chloride ions [Cl]erit to trigger initiation of the steel corrosion reaction is 0.04M? (b) What happens to the time of corrosion initiation when the concentration of chloride ions [CI] on the road surface is doubled? What happens if it is halved? Is keeping the bridge deck chloride concentration low (i.e., through washing the deck) a good strategy to extend the lifetime of the bridge before repairs and thus safe money on future repair and maintenance costs? 230 No.19@100 mm No.19@100 mm No.19@150 mm No.19@150 mm Figure: Cross Section of a 230mm Thick Reinforced-Concrete Bridge Deck (Note: All Dimensions in Millimeters) Build a deterministic model that can calculate the time until the first repair of a newly constructed reinforced concrete bridge deck (See Figure). The time until the first repair can be modeled as the time of initiation of chloride-induced corrosion. The diffusion coefficient of the concrete used to construct the bridge deck was measured in the testing lab to be 9.0 x 10¹ m²/s. (a) What is the time to the first repair for the bridge deck? Assume that the concentration of chloride ions [CI] on the road surface is 0.5M and the critical concentration of chloride ions [Cl]erit to trigger initiation of the steel corrosion reaction is 0.04M? (b) What happens to the time of corrosion initiation when the concentration of chloride ions [CI] on the road surface is doubled? What happens if it is halved? Is keeping the bridge deck chloride concentration low (i.e., through washing the deck) a good strategy to extend the lifetime of the bridge before repairs and thus safe money on future repair and maintenance costs? 230 No.19@100 mm No.19@100 mm No.19@150 mm No.19@150 mm Figure: Cross Section of a 230mm Thick Reinforced-Concrete Bridge Deck (Note: All Dimensions in Millimeters)
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a Time to first repair The time to first repair can be calculated using Ficks second law of diffusion which states that the flux of substance in this ... View the full answer
Related Book For
Financial Analysis with Microsoft Excel
ISBN: 978-1285432274
7th edition
Authors: Timothy R. Mayes, Todd M. Shank
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