01755917

Component

https://doi.org/10.1177/0361198120964725

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.

© National Academy of Sciences: Transportation Research Board 2020.

English

pp 108-120

2021-2

Transportation Research Record: Journal of the Transportation Research Board

Web

References (16)

Bond strength (Materials); Bridge superstructures; Concrete bridges; Girder bridges; Grouting; Repairing; Shear reinforcement; Shrinkage; Ultra high performance concrete

Bridges and other structures; Highways; Maintenance and Preservation; Materials

TRIS, TRB, ATRI

Oct 23 2020 3:05PM

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