Abstract
Metal culverts or pipes used in cross-drains along or across the Arkansas highway system are susceptible to corrode over time. Catastrophic incidents such as a complete washout of metal culverts along with roadway can be prevented if proper metals can be selected during the construction project. At present, the Arkansas Department of Transportation (ArDOT) does not have enough information about corrosion effects on metal culverts. The main objective of this study is to develop a user-friendly corrosion map for Arkansas by analyzing soil properties, water properties, and environmental data collected from the public domain as well as those gathered from laboratory experiments. Experimental data will be used to develop mathematical models to predict the resistivity and corrosive nature of soils. In this paper, relevant literature has been reviewed to narrow down the specific gaps in the available data and limitations in using methods to analyze the risk, challenges in developing regression and neural network models and risk mapping. Findings of this study have helped the research team to design the experimental plan and appropriate metrics need to be considered for developing the predictive models for this study.
Highlights
Highways of Arkansas are susceptible to corrosion in metal cross-drains
Corrosiveness of soil, quality of water passing through the drains, quality of sediments carried by water, quality of groundwater, depth of groundwater, and properties of backfill material, can significantly impact the corrosion rates
Arkansas Department of Transportation (ArDOT) does not have any scientific information about the spatial distribution of corrosion rates in Arkansas
Summary
Highways of Arkansas are susceptible to corrosion in metal cross-drains. The corrosion rate of the pipe or culvert materials depends on material properties itself, soil properties, and environmental factors. Corrosiveness of soil, quality of water passing through the drains, quality of sediments carried by water, quality of groundwater, depth of groundwater, and properties of backfill material, can significantly impact the corrosion rates. Several studies have been conducted in different states to analyze the service life of metal culverts, or pipes and to map the risk of corrosion. Specific guidelines related to metal pipe material selection and their installation and/or replacement schedule are not available. Detailed guidelines for selecting appropriate materials along with their replacement/installation will be developed. A detail literature review is presented along with a research plan to discuss the governing factors and their relative importance in corrosion risk analysis
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