Research Results Presentations are a platform for researchers to provide a final presentation on a research project. An overview of the project is provided with detailed discussions on the findings and recommendations. These presentations possess strong technical components and in-depth discussions that focus primarily on the research with minimal details on administrative matters.
Results Presentations typically last for 90 minutes, including time for questions/answers. Most of the presentations are offered nationwide via a live webinar coordinated through the Ohio LTAP Center. In addition to the live broadcast, the webinars are recorded and available for viewing at a later date. Results presentations are offered at no charge to attendees. Certificates of attendance are made available upon request to those who are physically present at the presentation.
Waterproofing Details of Connections for Adjacent Precast Concrete Box-Beam Bridges
October 30, 2018 9am-10:30am
The University of Akron, Anil Patnaik
Adjacent box-beams need to work together for a bridge to function effectively as a single unit. Structural performance of non-composite box-beam bridges is greatly dependent on the shear key, the connection details including the grout, waterproofing, and the tie rods. Severe leakage is commonly documented. Water leakage leads to premature aging and is the primary cause for corrosion of the prestressing strands and non-prestressed steel, which causes spalling and snapping of strands.
Prevention of water leakage is critical to minimize corrosion related deterioration at the longitudinal joints of adjacent box-beams. Any cracking along the joints and differential deflection of adjacent beams causes water proofing membrane to get damaged making water leakage inevitable. Most times the seeping water is contaminated with chloride from deicing materials which makes the concrete susceptible to corrosion related damage such as cracking and spalling.
This project is being conducted in collaboration with Ohio's Research Initiative for Locals (ORIL). This research was initiated by ODOT to establish the sources, causes and effects of inadequate waterproofing at joints and develop preventive measures through careful evaluation of alternatives on the state system. The scope of work was expanded to incorporate aspects specific to the local system such as: (1) analysis of adjacent precast reinforced concrete box-beams to establish the sources, causes and effects of inadequate waterproofing at the joints; (2) an evaluation of peel-and-stick waterproofing as a membrane alternative, (3) an analysis of grouting options/alternatives for keyway joints; and (4) develop preventive measures for existing and new box-beam bridges. The results of this research will provide a basis for better preparation of local officials to deal with system degradation of these structure types and maintenance of existing structures in addition to providing an opportunity for improvements in planning and design of new structures.
Register no later than Friday October 26, 2018
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