Page 132 - Machinery Component Maintenance

Machinery Foundations and Grouting 115

to remove stress concentration (see Figure 3-30). Similarly, dust, dirt,
chips, oil, water, and any other contaminants should be removed and the
foundation covered.
It is good practice to coat the clean, dry, chipped concrete with a coat-
ing of epoxy. This protective coating is a layer of unfilled (without aggre-
gate) epoxy grout, applied with a brush or broom (see Figure 3-31).
Once the coating has cured, the concrete is sealed from moisture and oil.
If there is a delay in grouting, the surface can be easily cleaned with de-
greaser sprayed from an air gun.

Old Concrete Preparation

Since old concrete has already cured, only visual checking for founda-
tion cracks is needed after chipping the surface to expose the aggregate.
All oil-soaked concrete must be chipped away and all cracks repaired.
The edges of the old foundation are chamfered, as with new concrete, for
2-in. to 4-in. at a 45 O angle. It is good practice to trepan a test core of the

Figure 3-30. Chamfer all the foundation edges at a 45O angle to remove stress concentra-
tions.