It is unacceptable to sand blast a foundation in preparation for grout. Preparation will need to be done with chipping hammers. A chipping hammer will properly profile the foundation and remove the laitance layer.
A high early concrete should only be used with the approval of the equipment user. Consider the use of Gill 33 for quick compressive strength and hydration.
Equipment should be set on separate foundation as not to pollute adjacent equipment with sympathetic vibration.
It should be big enough as to not violate the 30-degree rule.
The 30-degree rule is a best practice. If you drop a plumb line down from the center of the rotation shaft and rotate this line 30-degrees in both directions, the line should go through the bottom of the foundation and not the side. This will ensure stability of the foundation.
All existing foundation contamination must be removed by removing the concrete that is contaminated prior to grouting.
The maximum height of a foundation should allow a minimum of one and a half inches for grout placement.
The foundation should be of sufficient depth to prevent damage to the piping or machinery due to frost penetration. This depth can vary with geography. Also, consider the 30 degree rule and the required mass.
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