scholarly journals Effects of Interface Roughness on Shear Key Performance of Ultra-High Performance Concrete in Adjacent Box Girder Bridges

2019 ◽  
Author(s):  
Fouad T. Al Rikabi ◽  
Husam H. Hussein ◽  
Shad M. Sargand
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Interface Roughness ◽  
Ultra High Performance Concrete ◽  
Box Girder Bridges ◽  
Box Girder ◽  
Shear Key ◽  
Girder Bridges

Ultra-High-Performance Concrete Shear Keys in Concrete Bridge Superstructures

2020 ◽  
pp. 036119812096472
Author(s):  
Elsy Y. Flores ◽  
Jordan Varbel ◽  
William K. Toledo ◽  
Craig M. Newtson ◽  
Brad D. Weldon
Keyword(s):  
High Performance ◽  
Load Transfer ◽  
Mechanical Performance ◽  
High Performance Concrete ◽  
Surface Preparation ◽  
Ultra High Performance Concrete ◽  
Direct Tension ◽  
Girder Bridges ◽  
Grouting Material ◽  
Shear Keys

This research investigated the use of locally produced, non-proprietary ultra-high-performance concrete (UHPC) as a grouting material to repair deteriorated shear keys. Shear keys are used in adjacent girder superstructures to produce monolithic behavior and load transfer across the structure. Shear key degradation can jeopardize the integrity of the structure. Transportation agencies have reported that 75% of distress in adjacent girder bridges is because of cracking and de-bonding along shear keys. Previous research has shown that locally produced UHPC has excellent mechanical and durability properties. UHPC has also been shown to have good bonding characteristics that are desirable in a potential grouting material. Bond strength between UHPC grout and substrate concrete was evaluated using slant-shear and direct tension tests. Results showed that adequate bond was achieved at 7 days. Low strengths at 28 days were observed because of low strength of the substrate concrete. Shrinkage of UHPC grout was also investigated. Shrinkage at 28 days was less than 600 µstrain which is acceptable for repair practices. Full-scale testing was used to evaluate load-deflection behavior of channel girder assemblages with grouted shear keys. Results showed that UHPC grout and non-shrink grout had similar mechanical performance. Excellent bond was achieved with all grouts, even with minimal surface preparation. The similar performances of the non-shrink grout and the UHPC grout indicates that UHPC grout does not provide a mechanical benefit over the non-shrink grout.

Prefabricated Box Girder with Ultra High Performance Concrete

2018 ◽  
Author(s):  
Keli Xiao ◽  
Yanjun Jin ◽  
Lin Li ◽  
Wei He ◽  
Duan Xinlong
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Slab Thickness ◽  
Low Carbon ◽  
Ultra High Performance Concrete ◽  
Dead Weight ◽  
Box Girder ◽  
Ordinary Concrete ◽  
Shear Connectors ◽  
Thin Beams

<p>In order to solve traffic difficulty brought by the bridge construction in the city, and difficult transportation of beams, this paper puts forward the prefabricated-box-girder bicycle viaduct with ultra - high performance concrete (UHPC) through which will achieve light and thin beams, easy transportation and rapid construction. Based on the bicycle viaduct with 5.5m in width, this paper not only designs a prefabricated ribbed thin-walled box girder with 30m in span, including the detailed design of prefabricated segment stiffeners, shear connectors and external prestressing but also compares the UHPC box girder with ordinary concrete box girder and steel box girder. The research shows that with the application of UHPC in prefabricated viaduct in city, the ratio of height to span of beams and the slab thickness decrease to 1/30 and 10cm respectively, the dead weight is 50% lower than that of the ordinary concrete beams and the 3m long lifting weight is only 10 tons. Light and thin beams are suitable for transportation in city because of their low requirements for transportation and hoisting equipment. UHPC beams have no steel bars and own the advantages of dense texture, good durability, low maintenance costs, reflecting the concept of low carbon environmental protection and green bridge.</p>

Shear Key Performance in Multibeam Box Girder Bridges

1995 ◽  
Vol 9 (4) ◽  
pp. 271-285 ◽  
Author(s):  
Arthur A. Huckelbridge ◽  
Hassan El-Esnawi ◽  
Fred Moses
Keyword(s):  
Box Girder Bridges ◽  
Box Girder ◽  
Shear Key ◽  
Girder Bridges
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