Inspection Protocol and Non-destructive Method Selection for Precast Bridges

Rumbayan, Rilya (2016) Inspection Protocol and Non-destructive Method Selection for Precast Bridges. Jurnal Teknika (1). ISSN 1412-4882

Text Rilya Rumbayan_JURNAL TEKNIKA MEI 2016_Inspection Protocol for Precast Concrete Box Girder Bridges.pdf Download (861kB)

Abstract

Precast concrete box girder bridges are susceptible to collapse and failure due to corrosion and fracture of prestresssing strands in the bottom flange of the girder. Inspection protocols using NDE methods has the potential to identify the presence of corroded prestressing strands, which can prevent collapse of these concrete bridges due to corrosion and fracture of prestressing strands. Two NDE methods have been chosen to be part of the inspection protocol for precast concrete box girder bridges. Infrared (IR) thermography, through the use of cameras, can identify areas of infrared radiation emitted from the surfaces of objects, which in turn can be related to surface temperatures. The differences in surface temperatures assist in identification of areas of delamination and presence of cracks on the bottom flange of the box girder. The areas of delamination can result from prestressing strands that have section loss caused by corrosion. If large areas of delamination are identified, then Magnetic Flux Leakage (MFL) can be used on the areas identified as having delamination. MFL can provide data on the section loss of prestressing strands that result from corrosion. A cost estimate has been established for performing both IR Thermography and MFL, which each are part of the inspection protocol. An inspection protocol and its associated costs and limitations to perform NDE methods on precast concrete box girder bridges is presented to prevent these bridges from failing due to corrosion and fracture of prestressing strands. Keywords: precast concrete, non-destructive evaluation, infrared thermography, magnetic flux leakage

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