Tran-SET 2020
Assessment of Ultra-High Performance Concrete Overlays on Concrete Bridge Decks
Publication: Tran-SET 2020
ABSTRACT
This paper assesses the potential of a locally produced ultra-high performance concrete (UHPC) mixture proposed for use as an overlay material for concrete bridge decks. In this study, early-age and longer-term shrinkage tests were performed on locally produced UHPC. Slant-shear tests were conducted to evaluate the shear strengths at the bond interface between the UHPC and substrate concrete. Thermal and shrinkage effects in normal strength concrete slabs overlaid with UHPC were also observed. Early-age shrinkage testing showed that approximately 55% of the strain occurred in the plastic state and may not contribute to bond stresses since the elastic modulus of the UHPC should be small at such early ages. Adequate shear strengths were achieved for texture depths ranging from 0.05 to 2.8 mm. Thickness of the substrate and amount of reinforcing steel were important factors for shrinkage in the slabs. The thickest slab experienced greater shrinkage than a thinner slab with the same reinforcement, indicating reinforcement ratio is more important than the area of steel. Continuing work focuses on the development of a failure criterion for the brittle bond between a UHPC overlay and a concrete bridge deck.
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ACKNOWLEDGEMENTS
The authors would like to thank Tran-SET for funding this project, the New Mexico Department of Transportation for their continued support of UHPC research and collaboration, and BASF Chemical Company for their donations of silica fume and admixtures.
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Information & Authors
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Published In
Tran-SET 2020
Pages: 278 - 286
Editors: Craig Newtson, Ph.D., New Mexico State University, Susan Bogus Halter, Ph.D., University of New Mexico, and Marwa Hassan, Ph.D., Louisiana State University
ISBN (Online): 978-0-7844-8330-5
Copyright
© 2021 American Society of Civil Engineers.
History
Published online: Jan 12, 2021
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