The surface of the concrete base must be free of any loose, friable material, be dry and free of dust and laitance and be sufficiently mature not to interfere physically or chemically with the bearing grout.
Holding-down bolts: It is best to grout the holding-down bolts first. This ensures that they have been filled completely. Some specifications call for grouting of anchor pockets and under-plate bearings at the same time; this can lead to air entrapment and voids in the pockets, unless the grout is very fluid.
Removable shims: Steel shims are used to provide the correct levelling and alignment of the baseplate which is then fixed in place using anchor bolts. The shims can be removed or can remain as long as they are corrosion proofed.
Shuttering: Ensure the shuttering is sealed tight to the base to ensure no grout loss.