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51317--9576-Inland Wharves - Challenges of Service Life Modeling

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The Houston Ship Channel is a modern engineering feat. Brackish water. Chloride induced corrosion. Subsidence. Change in water levels and exposure conditions. These issues are explored in this paper reviewing methodologies and results of service life modeling from a recent multi-structure assessment by the authors.

 

Product Number: 51317--9576-SG
ISBN: 9576 2017 CP
Author: Jonah Kurth
Publication Date: 2017
Industries: Maritime , Corrosion Monitoring and Control
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The Houston Ship Channel is a modern engineering feat ­— major efforts in deepening and widening the channel over the last 100 years have enabled construction of a string of cargo wharves from Galveston Bay into the city limits of Houston. Service life assessment and modeling for these concrete and steel wharf structures present uniquechallenges compared to more typical coastal maritime structures. The channel contains brackish water with chloride contents ranging from 2000 mg/l upriver to around 10000 mg/l in Galveston Bay. At the lower ranges chloride-induced corrosion is a risk to concrete structures primarily where wetting and drying cycles concentrate the chloride; even in those areas the measured surface chloride concentrations overlap the range of typical chloride-induced corrosion thresholds. In addition subsidence of 5 feet or more over the last 100 years in the Houston region has resulted in a net increase of water level and a change in exposure conditions as these structures age.These issues are explored in this paperreviewing methodologies and results of service life modeling from a recent multi-structure assessment conducted by the authors.

Key words: service life modeling, reinforced concrete, corrosion, brackish water  

The Houston Ship Channel is a modern engineering feat ­— major efforts in deepening and widening the channel over the last 100 years have enabled construction of a string of cargo wharves from Galveston Bay into the city limits of Houston. Service life assessment and modeling for these concrete and steel wharf structures present uniquechallenges compared to more typical coastal maritime structures. The channel contains brackish water with chloride contents ranging from 2000 mg/l upriver to around 10000 mg/l in Galveston Bay. At the lower ranges chloride-induced corrosion is a risk to concrete structures primarily where wetting and drying cycles concentrate the chloride; even in those areas the measured surface chloride concentrations overlap the range of typical chloride-induced corrosion thresholds. In addition subsidence of 5 feet or more over the last 100 years in the Houston region has resulted in a net increase of water level and a change in exposure conditions as these structures age.These issues are explored in this paperreviewing methodologies and results of service life modeling from a recent multi-structure assessment conducted by the authors.

Key words: service life modeling, reinforced concrete, corrosion, brackish water  

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