Page 130 - Machinery Component Maintenance

Machinery Foundations and Grouting 113

Figure 3-28. Always check the underside of the baseplates. Notice the center compart-
ment is blocked by cross braces and would receive no grout.

machinist’s level on the additional border around the pump and driver
may not be the preferred method of leveling, it will work.

New Concrete Preparation
Freshly poured concrete must be allowed to cure before epoxy grout is
applied. As mentioned, even the small amount of moisture from green
concrete will ruin the epoxy grout/concrete bond. It is good practice to
run an ASTM-157-80 Concrete Shrinkage Test to determine when the
shrinkage drops to a minimum. This will indicate the end of the chemical
reaction of the cement and water, which causes the concrete to cure. If no
shrinkage test is run, the following rules of thumb for cure time can be
used:
Standard concrete (five-bag mix) 28 days
Hi-early concrete (six- to seven-bag mix) 7 days
An additional test for moisture can be made by taping a 1-ft2 piece of
plastic over the new concrete and allowing it to stay overnight. If there is