A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Evaluating Remaining Strength of Thinning and Weakening Lined Cylinder PCCP Force Mains due to Hydrogen Sulfide Corrosion
Broken prestressing wire wraps are known as the primary cause of failure in a pressurized prestressed concrete cylinder pipe (PCCP) due to dissolution corrosion or hydrogen embrittlement. The effects of internal hydrogen sulfide attack to the concrete core can lead to delamination, spalls or pipe thinning and weakening of the concrete. The severity of the damaged concrete core typically increases from springline to the crown of the pipe. In some cases, it was observed that the interior concrete core at the crown of the pipe has completely deteriorated and the steel cylinder was exposed at the crown and corroded. For the case study, nonlinear finite-element analysis (FEA) is used to investigate the performance of a 30-inch and 48-inch Lined-Cylinder Prestressed Concrete Pipe (LCP) with a thinning and weakening concrete core. To understand the effects of concrete spalls and delamination, the stress and strain in the various components of a damaged LCP were investigated by applying the realistic loading while varying the number of broken prestressing wire wraps. The results were calculated for the aforementioned 48-inch diameter LCP design with 5, 35, 70, and 100 broken wire wraps and 30-inch diameter LCP design with 5, 25, 50, and 75 broken wire wraps. Based upon the results obtained, a comparison was performed between the effect of the broken wire wraps in the LCP with the deteriorated concrete core and a fully intact concrete core.
Evaluating Remaining Strength of Thinning and Weakening Lined Cylinder PCCP Force Mains due to Hydrogen Sulfide Corrosion
Broken prestressing wire wraps are known as the primary cause of failure in a pressurized prestressed concrete cylinder pipe (PCCP) due to dissolution corrosion or hydrogen embrittlement. The effects of internal hydrogen sulfide attack to the concrete core can lead to delamination, spalls or pipe thinning and weakening of the concrete. The severity of the damaged concrete core typically increases from springline to the crown of the pipe. In some cases, it was observed that the interior concrete core at the crown of the pipe has completely deteriorated and the steel cylinder was exposed at the crown and corroded. For the case study, nonlinear finite-element analysis (FEA) is used to investigate the performance of a 30-inch and 48-inch Lined-Cylinder Prestressed Concrete Pipe (LCP) with a thinning and weakening concrete core. To understand the effects of concrete spalls and delamination, the stress and strain in the various components of a damaged LCP were investigated by applying the realistic loading while varying the number of broken prestressing wire wraps. The results were calculated for the aforementioned 48-inch diameter LCP design with 5, 35, 70, and 100 broken wire wraps and 30-inch diameter LCP design with 5, 25, 50, and 75 broken wire wraps. Based upon the results obtained, a comparison was performed between the effect of the broken wire wraps in the LCP with the deteriorated concrete core and a fully intact concrete core.
Evaluating Remaining Strength of Thinning and Weakening Lined Cylinder PCCP Force Mains due to Hydrogen Sulfide Corrosion
Hajali, Masood (author) / Alavinasab, Ali (author)
Pipelines 2015 ; 2015 ; Baltimore, Maryland
Pipelines 2015 ; 1630-1641
2015-08-17
Conference paper
Electronic Resource
English
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