Page 133 - Machinery Component Maintenance
P. 133
116 Machinery Component Maintenance and Repair
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Figure 3-31. Coat the clean, dry, chipped concrete with a coating of unfilled (without ag-
gregate) epoxy grout.
old concrete and perform a compressive strength test. If the compressive
strength is under 3,000 psi, the foundation should be replaced.
Anchor Bolts
The free length of anchor bolts should equal 10 to 15 times the bolt
diameter. This permits the bolt to stretch sufficiently to develop the de-
sired holding force. If epoxy grout is allowed to grip the anchor bolt, the
bolt may break at the grout surface even when tightened to the design
torque. It is therefore prudent to use bolt sleeves in the concrete. If
sleeves are used, they must be filled with a non-binding material, such as
flexible foam, to prevent the epoxy grout from filling the sleeves and
