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Articles 151 - 152 of 152
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Bridge Inspecting With Unmanned Aerial Vehicles R&D, Paul Darby, Vijaya Gopu
Bridge Inspecting With Unmanned Aerial Vehicles R&D, Paul Darby, Vijaya Gopu
Publications
The project achieves through research including literature, on site interviews, and experimentation: 1) a recommendation for a UAV-based system to practically assist in routine bridge inspection work in the State of Louisiana, 2) the identification and description of advantages, disadvantages, and limitations in the use of UAVs for routing bridge inspection work in Louisiana, and 3) provided recommendations for future work. The Yuneec H520 aircraft and its E90 camera are recommended, as is the need for a boat to be included as part of the system. The recommended system has advantages in reaching portions of the bridge that are difficult …
Bridge Deck Overlays Using Ultra-High Performance Concrete, Craig Newtson, Brad Weldon
Bridge Deck Overlays Using Ultra-High Performance Concrete, Craig Newtson, Brad Weldon
Publications
This study investigated the use of a locally produced ultra-high performance concrete (UHPC) as an alternative to typical overlay materials. Several bond strength tests including slant-shear, splitting tension, and direct tension tests were performed to assess the bond strength between UHPC and normal strength concrete (NSC) substrate with varying surface textures. Tests were also conducted to assess the early-age and longer-term shrinkage behavior and coefficient of thermal expansion of the UHPC as well as rapid chloride permeability testing. Good bond between UHPC and NSC substrate was observed even with inadequate surface texture. Combined shrinkage and thermal effects were investigated for …