2.7—Bonding methods
Repair materials may or may not require a separate
bonding agent. In either case, the success of the repair
depends on achieving intimate and continuous contact
between the repair material and the substrate. Intimate
contact can be achieved by vibration, pneumatic application, high fluidity, and troweling pressure in conjunction with
attaining an optimum surface profile.
In cases where a separate bonding agent is to be used,
application of the bonding agent to the prepared substrate
should be done with care and should be timed to the placement
of the repair material. Bonding agents applied to substrates
may begin setting or curing prematurely, creating a bond
breaker with the new repair material. Cement-based bonding
agents are sprayed or broomed, whereas epoxy- and latexbased
systems are rolled, broomed, or sprayed.
Whether the repair material is self-bonding or a separate
bonding agent is used, tests should be conducted to ensure
that bonding is taking place. In-place tensile pull-off tests are
recommended to evaluate that bonding of repair materials is
adequate. This testing provides for the evaluation of the
adequacy of surface preparation, provides a thickness and
consolidation assessment, evaluates the tensile (bond)
strength, and assesses the failure mode. Such in-place testing
should use the method described in ACI 503R, Appendix A.
2.7—Bonding methodsRepair materials may or may not require a separatebonding agent. In either case, the success of the repairdepends on achieving intimate and continuous contactbetween the repair material and the substrate. Intimatecontact can be achieved by vibration, pneumatic application, high fluidity, and troweling pressure in conjunction withattaining an optimum surface profile.In cases where a separate bonding agent is to be used,application of the bonding agent to the prepared substrateshould be done with care and should be timed to the placementof the repair material. Bonding agents applied to substratesmay begin setting or curing prematurely, creating a bondbreaker with the new repair material. Cement-based bondingagents are sprayed or broomed, whereas epoxy- and latexbasedsystems are rolled, broomed, or sprayed.Whether the repair material is self-bonding or a separatebonding agent is used, tests should be conducted to ensurethat bonding is taking place. In-place tensile pull-off tests arerecommended to evaluate that bonding of repair materials isadequate. This testing provides for the evaluation of theadequacy of surface preparation, provides a thickness andconsolidation assessment, evaluates the tensile (bond)strength, and assesses the failure mode. Such in-place testingshould use the method described in ACI 503R, Appendix A.
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