Distributed Fiber Optic Sensor-Enhanced Detection and Prediction of Shrinkage-Induced Delamination of Ultra-High-Performance Concrete Overlay
This study develops a delamination detection system for smart ultra-high-performance concrete (UHPC) overlays using a fully distributed fiber optic sensor. Three 450 mm (length) × 200 mm (width) × 25 mm (thickness) UHPC overlays were cast over an existing 200 mm thick concrete substrate. The initiation and propagation of delamination due to early-age shrinkage of the UHPC overlay were detected as sudden increases and their extension in spatial distribution of shrinkage-induced strains measured from the sensor based on pulse pre-pump Brillouin optical time domain analysis. The distributed sensor is demonstrated effective in detecting delamination openings from microns to hundreds of microns. A three-dimensional finite element model with experimental material properties is proposed to understand the complete delamination process measured from the distributed sensor. The model is validated using the distributed sensor data. The finite element model with cohesive elements for the overlay-substrate interface can predict the complete delamination process.
Y. Bao et al., "Distributed Fiber Optic Sensor-Enhanced Detection and Prediction of Shrinkage-Induced Delamination of Ultra-High-Performance Concrete Overlay," Smart Materials and Structures, vol. 26, no. 8, Institute of Physics - IOP Publishing, Jul 2017.
The definitive version is available at https://doi.org/10.1088/1361-665X/aa71f4
Civil, Architectural and Environmental Engineering
International Standard Serial Number (ISSN)
Article - Journal
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01 Jul 2017