Do we need to apply a bonding agent before applying the shotcrete?
No bonding agent is required.
A key to a successful repair is proper surface preparation. The surface receiving the shotcrete must have the deteriorated material completely removed, be thoroughly cleaned, and in a saturated surface-dry condition (SSD) at the time of shotcrete application. Another key item is proper curing and protection following shotcreting. Details can be found in the Task Force 37 Report Guide Specification for Shotcrete Repair of Highway Bridges. The document is available from the American Association of State Highway and Transportation Officials (AASHTO), Washington, DC.
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Tags: AASHTO, bonding agent, shotcrete