Page 138 - Machinery Component Maintenance

Machinery Founddons and Grouting 121

Epoxy Grout Placement

The pump baseplate is ready for grouting after the following last min-
ute checks are made:
Baseplate under surface is free of oil, scale, dirt, or moisture and
sealed with a coating of unfilled epoxy grout.
Concrete surface is clean. free of oil, dirt, and moisture. It is sealed
with a coating of unfilled epoxy grout.
Anchor bolt sleeves are filled with non-bonding material.
Exposed surfaces of anchor bolts are covered with sealant or wax.
Jack screws are lubricated for easy removal.
Circular steel plates are under each jack-screw point.
Vent holes are in correct locations and unobstructed.
0 Forms in contact with grout are properly waxed (three coats).
Grouting materials are in unopened containers, dry, and stored at
70°F to 80°F for 24 hours prior to placement.
0 Sufficient quantities of grout materials are on hand at site to com-
plete work. (Add 25 percent to calculated grout requirement.)
Epoxy grouts have a narrow temperature range for mixing and place-
ment. This range is from 50°F to 90°F for best pot life, flowability, and
curing. Can epoxy grout be poured at temperatures below or above these
limits? The answer is yes, but special procedures must be followed and
the grout manufacturer should be consulted. Low temperature accelera-
tors can be added for cold weather pours with the foundation and base-
plate covered and heated. In parts of the world, the problem is with tem-
peratures above 95°F. Consider storing epoxy grout and aggregate in
air-conditioned offices for 48 hours to increase the pot life on hot days. In
hot weather. construct temporary shelters over the baseplate to provide
shade 24 hours before and 48 hours after the grout placement. It is a good
practice to rope off a work area in congested construction sites to set up
the grouting operation. Grouting material and tools should be located in-
side the roped-off area just before the job starts.
With temperature-conditioned grout at the pump site and all the check-
list items completed, it is time to mix the grout. There are two ways to
mix the grout:
In a wheelbarrow with a mortar mixing hoc.
In a motorized mortar mixer.

Both methods work well, but for a large grout job (10 units or more) the
motorized mixer should be used. If the hand-mixing method is used, have
two wheelbarrows and stagger their mixing sequence to provide a contin-
uous supply of grout to the people making the pour. The hand-mixing