The durability of a concrete repair is highly dependent on the shear strength of the interface between new and old concrete. Therefore, the engineer designing the repair makes every effort to maximize this strength. To that end, pretreatments, such as prewetting the substrate and/or applying bonding agents, are commonly specified. The efficacy of these pretreatments is often debated, and previous studies have produced contradictory results. This research was undertaken to determine the effects of prewetting the substrate and applying a bonding agent, both in combination and individually. The bond strength in tension and the shear strength of the bond were measured using a variety of methods, including in-place testing and testing of extracted specimens. The results indicate that both prewetting and the use of a bonding agent can be beneficial to the shear strength of bonded overlays.
|Advisor:||Rutz, Frederick R.|
|Commitee:||Li, Chengyu, Rens, Kevin L.|
|School:||University of Colorado at Denver|
|School Location:||United States -- Colorado|
|Source:||MAI 56/02M(E), Masters Abstracts International|
|Keywords:||Bond (concrete to concrete), Concrete overlay, Concrete repair, Concrete shear tests|
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