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- W2936952595 abstract "Many existing bridges have adjacent girders that utilize grouted shear keys to transfer loads laterally across the superstructure. Cracking and leaking often cause degradation of the shear key and the girder. This work investigates the potential for using non-proprietary ultra-high performance concrete (UHPC) as a grouting material for repair of deteriorated shear keys by testing bond strength between UHPC and substrate concrete surfaces that were either formed or scarified by chipping. Bond strengths were adequate for both surface textures even though texture depth was substantially less than recommended by ACI 546. Scanning electron microscopy has also been used to investigate the bonded area. This microscopic scanning has shown fly ash residue remaining on the substrate after bond failure, indicating that the supplementary cementitious materials produce much of the bond. Ongoing work for this project also includes full-scale testing of UHPC shear keys between pre-stressed channel girders." @default.
- W2936952595 created "2019-04-25" @default.
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- W2936952595 date "2019-01-01" @default.
- W2936952595 modified "2023-10-17" @default.
- W2936952595 title "Ultra-High-Performance Concrete Shear Keys in Concrete Bridge Superstructures" @default.
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- W2936952595 doi "https://doi.org/10.1051/matecconf/201927107006" @default.
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