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Abstract:Structural repairs of bridge piers and abutements require patching concrete
used depends upon the depth of the patch to be made. In some instances, the
use of a liquid bonding agent has been specified in the mixes as well as in a
grout scrubbed onto the surface to be patched prior to the mix placement.
Most of the bonding agents presently approved by the Iowa D.O.T. are
polyvinyl acetate (PVA) or some type of latex.
In a general discussion with a consultant about various types of bridge
repair materials and processes, the subject of bonding agents was discussed at
some length. It was the opinion of the consultant that the usage of polyvinyl
acetates should be discontinued because of possible deterioration of this
material with time. Some of these materials apparently re-emulsify in a high
moisture environment causing serious patch deterioration. As a result of this
information, a study was initiated to determine the durability of these
materials.
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