NDE of FRP Bridge Decks and Beams
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1 NDE of FRP Bridge Decks and Beams John C. Duke, Jr. Virginia Tech NDE Development Laboratory Virginia Tech NDEDL Va FRP Showcase 1
2 Virginia Tech NDEDL Va FRP Showcase 2
3 Presentation Overview Reasons for Considering FRP Long-term Durability: Deterioration Mechanisms Quality of FRP for Civil Infrastructure Review of NDE for FRP Beams and Decks Health Monitoring: An Alternative Approach Virginia Tech NDEDL Va FRP Showcase 3
4 Reasons for Considering FRP Wide Spread Deterioration of Bridge Structures and Decks Bridge Beams- light weight offers construction advantage/ corrosion resistance Bridge Decks- light weight alternative to concrete for structures in jeopardy of reduced load rating Rapid Replacement in High Traffic Areas Virginia Tech NDEDL Va FRP Showcase 4
5 Long-term Durability: Deterioration Mechanisms Polymer matrix cracking Glass and Carbon fiber breakage Voids Planar separations/delaminations Effects of environment: moisture, UV, temperature [30-50 years] Virginia Tech NDEDL Va FRP Showcase 5
6 High Performance FRP Low void content Good fiber alignment Good fiber distribution Virginia Tech NDEDL Va FRP Showcase 6
7 Quality of FRP for Civil Infrastructure Large void content Fiber layer waviness Resin rich and resin starved areas Virginia Tech NDEDL Va FRP Showcase 7
8 Review of NDE of FRP Beams and Decks Ultrasonic C-scanning: Forest vs trees Infrared Thermal Imaging Prefabrication screening Field testing: access and appropriate gradient Determining critical flaws Simulating effects of long term environmental exposure Strengthening: FRP vs FRP-concrete bond vs concrete deterioration Virginia Tech NDEDL Va FRP Showcase 8
9 Ultrasonic C-scan of FRP Bridge Beam Flange Virginia Tech NDEDL Va FRP Showcase 9
10 Infrared Thermal Imaging Delaminated pultruded beam Resin starved pultruded beam Virginia Tech NDEDL Va FRP Showcase 10
11 Infrared Thermal Imaging in the Field Virginia Tech NDEDL Va FRP Showcase 11
12 IRT of Simulated disbond with and without moisture Virginia Tech NDEDL Va FRP Showcase 12
13 Thermal Imaging of Moisture Heated with Microwave Radiation Virginia Tech NDEDL Va FRP Showcase 13
14 IRT of FRP Strengthening of a Concrete Box Girder Virginia Tech NDEDL Va FRP Showcase 14
15 NDE Challenges Initiation of deterioration of polymer matrix and fibers on the scale of manufacturing imperfections Global deterioration consistent with longterm durability applications>>when and where does localization [leading to structural failure] occur? Virginia Tech NDEDL Va FRP Showcase 15
16 Health Monitoring: An Alternative Approach Monitor the mechanical condition of the structure to assure continue safe-use Monitor the deterioration [breakage] of critical element the reinforcing fibers Detect the presence of moisture that might lead to further deterioration in order to perform remediation or repair Virginia Tech NDEDL Va FRP Showcase 16
17 Acoustic Emission Monitoring AE versus Strain AE (cummulative counts) tension, 1st loading tension, 2nd loading c ompression, 1st loading compr ession, 2nd loading E E E E E E E E+03 Strain (microstrain) Virginia Tech NDEDL Va FRP Showcase 17
18 Acousto-ultrasonic evaluation of top plate of FRP bridge deck Virginia Tech NDEDL Va FRP Showcase 18
19 Embedded/attached distributive strain sensors Strain Contour with color indicating the strain level Virginia Tech NDEDL Va FRP Showcase 19
20 Multiple Bragg Fiber Optic Strain Sensors sensors Courtesy of Luna Innovations Virginia Tech NDEDL Va FRP Showcase 20
21 Embedded/attached sensor for detection of inplane displacement AE caused by fiber breaks 3.5 Out-of-plane AE sensor 3 In-plane AE Sensor Virginia Tech NDEDL Va FRP Showcase 21
22 Extrinsic Fabry-Perot Interferometric AE Sensor Luna Innovations, Inc. Virginia Tech NDEDL Va FRP Showcase 22
23 Embedded moisture detection sensor Luna Innovations, Inc. Virginia Tech NDEDL Va FRP Showcase 23
24 Questions / More Information J. Duke the.nde.guy@vt.edu Virginia Tech NDEDL Va FRP Showcase 24
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