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Pages 19-29

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From page 19...
... 19   Findings and Applications 3.1 Introduction e research project consisted of a literature search, an analytical investigation of the parameters that aected shear key performance, and physical testing. e physical testing consisted of testing the bond between various shear key materials and various conditions of the preparation of the girder sides, and testing two, full-scale specimens.
From page 20...
... 20 Guidelines for Adjacent Precast Concrete Box Beam Bridge Systems Figure 10. Typical results for transverse stresses in the currently used, partial-depth Type III shear key.
From page 21...
... Findings and Applications 21 cracking will not penetrate the entire depth of the shear key, and this may prevent leakage. ere was no clear inuence of span or skew on the stresses.
From page 22...
... 22 Guidelines for Adjacent Precast Concrete Box Beam Bridge Systems Figure 13. Typical results for transverse stresses in the mid-depth shear key.
From page 23...
... Findings and Applications 23 e results suggest that using a full-depth shear key and not grouting the top 4 inches would be eective in preventing or lessening cracking. Note that Figure 10 shows that removing the grout from the throat of the currently used Type III shear key may not be eective as that entire shear key is seen to be in tension.
From page 24...
... 24 Guidelines for Adjacent Precast Concrete Box Beam Bridge Systems of post-tensioning force application, but it falls o quickly away from the points of load application and actually causes tensile stresses in some areas. is is consistent with other analytical models from the literature, lab experiments, and eld observations (see Chapter 1)
From page 25...
... Findings and Applications 25 bond strength. erefore, for roughened surfaces, prewetting of the girder surface is highly recommended.
From page 26...
... 26 Guidelines for Adjacent Precast Concrete Box Beam Bridge Systems grouted. The high bond grout shear key was cast without any problems.
From page 27...
... Findings and Applications 27 Figure 17. Areas of delamination in the non-shrink grout shear key.
From page 28...
... 28 Guidelines for Adjacent Precast Concrete Box Beam Bridge Systems applied, 100,000 cycles of live load were applied. Again, no leaks were found.
From page 29...
... Findings and Applications 29 Figure 20. Delamination at the end of joints, but no dye penetration is found.

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