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Chemical and Acoustic Emission Evaluation Studies of Concrete Bridge in Marine Environment
No full textA field investigation of the Fair Isle Bridge, Miami, Florida consists of a nondestructive evaluation program including physical and acoustic emission (AE) assessment. The bridge is situated in a marine environment and its deck consists of PC and RC sections. Chemical evaluation is performed prior to strengthening with CFRP laminates and consists of visual inspection, carbonation, pH evaluation, chloride content, and steel corrosion detection by half-cell potential. After repair, three additional physical assessments are performed: crack mapping, thermography, and AE. These combined techniques provide sufficient information to create layered maps to evaluate the condition of the bridge structure. Within the maps, areas of interest are explored and compared for high probability of corrosion and concrete damage. Through spatial analysis of physical and chemical evaluation data, areas with significant potential difference are identified. These areas are the focus of a load test while monitoring strain, load and AE. The AE program components consist of in-service traffic monitoring and a load test in the elastic range. An experimental program was also conducted in a controlled laboratory environment where beams were subjected to corrosion conditioning and cyclic loading to failure. The NDT methods studied in this thesis are correlated by means of spatial analysis and provide a novel method for field inspections.</p
Parameter Identification System (PARIS) for Automated Finite Element Model Updating of Full-Scale Structures
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