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Long Term Degradation of FRP Bond in Harsh Climate

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Long Term Degradation of FRP Bond in Harsh Climate

 

In the last several decades, fiber reinforced polymers (FRPs) have been increasingly used to strengthen highway bridges. Although various FRP strengthening guidelines have been published, FRP is a relatively new material for civil engineering applications. As a result, limited data exist for assessment of the long-term durability of bond between FRP and concrete, a critical system performance parameter. The objective of this research is to model the rate of bond degradation between the concrete and FRP interface of a FRP system installed on highway bridges exposed to the harsh climate of the Midwest United States. The model is based on actual in-situ data, and develops a time-deterioration relationship that allows prediction of future bond strength throughout the service lifetime of the structure. Data were gathered by field testing two FRP-strengthened members as well as laboratory specimens with up to 15 years of exposure time. A nonlinear regression analysis was conducted on the deterioration data to determine a best-fit deterioration curve. Finally, appropriate strength reduction factors that account for deterioration for different structural service lifetimes are presented.

 

Authors: Sasan Siavashi, Abdel A. Makkawy, Christopher D. Eamon, and Hwai-Chung Wu

 

Conference: SAMPE Seattle 2017

 

SKU/Code: SE17--0646

Pages: 13


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