Interfacial Properties of Ultrahigh-Performance Concrete and High-Strength Concrete Bridge Connections
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 5
Abstract
Recently, ultra-high performance concrete (UHPC) has been utilized in highway bridge connections, where its superior strength and durability help to reduce joint cracking and enhance transverse load transfer. According to the load and resistance factor design (LRFD) bridge design procedure specified by AASHTO, the strength of the connections is dependent on the adhesion and friction between the connected materials. The objective of the present research is to identify the adhesion value between UHPC and high-strength concrete (HSC) with varying degrees of roughness. To this end, UHPC-HSC specimens were tested in direct tension according to ASTM protocols, and the maximum tensile stress at failure was obtained. Test results show that the average maximum tensile stress for the UHPC-HSC specimens with a smooth interface exceeds that determined from past research for any degree of roughness. Furthermore, the average maximum tensile stress increases with the degree of roughness. The results from the direct tension tests, along with those from slant-shear tests performed on similar materials in a previous study, were then used to back-calculate the friction coefficients using Mohr-Coulomb theory.
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Acknowledgments
The authors would like to thank the Federal Highway Administration (FHWA) Turner-Fairbank Highway Research Center (TFHRC) for their assistance with this research and Lafarge North America for providing the UHPC.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 28 • Issue 5 • May 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Apr 6, 2015
Accepted: Aug 19, 2015
Published online: Jan 4, 2016
Published in print: May 1, 2016
Discussion open until: Jun 4, 2016
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