Prepare concrete surface on which grout will be placed to provide a minimum 1/2 in. peak-to-valley profile with removal of all laitance and microcracking from concrete and exposure of coarse fractured aggregate. Use only small hand tools, or a small pneumatic hammer with a 30 lb maximum impact with a sharp moil or chisel point, to generate profile. Do not use nail-point tools, bush or bush head bits, large jackhammers, or pavement breakers.
Thoroughly clean and protect surface. If water is used for cleaning, allow surface to air dry for a minimum of 48 hours prior to grout installation.3.1.2 Verify that foundation moisture content is within range specified by material supplier. Use the specified test method from supplier. Adjust foundation moisture if outside the specified range.
3.1.3 Clear debris, dirt, and water by oil-free compressed air or vacuum from anchor bolt sleeves, shear key pockets, and other holes and similar items that are specified to be grouted.
3.1.4 Clear debris, dirt, and water by oil-free compressed air or vacuum from anchor bolt sleeves, shear key pockets, and other holes and similar items that are specified not to be grouted. Fill with a nonbonding moldable material as speci-fied in Contract Documents.
3.1.5 Install pins; dowels; or other means of controlling shrinkage cracks, edge lifting, or both, in areas of unre-strained grout as specified in Contract Documents.
3.1.6 Inspect machine base to ensure that grout can be placed beneath the plate without trapping air in unvented corners. Where possible, inspect the inside of the baseplate for blind areas or obstruction of flow. Verify that a vent hole 1/4 to 1/2 in. in diameter is placed through the plate at the intersection of all crossing stiffeners and at each point where air may be trapped.
3.1.7 Verify that grout holes for placement are located so that grout does not travel more than approximately 48 in. The grout holes shall have been placed so that grouting can be started at one hole and progressed to other holes to ensure that the grout flows under all areas of the plate. Verify that holes for pumping epoxy grout are 3/4 to 2 in. in diameter and threaded for standard pipe threads. Grout holes for free-pouring grout shall be 3 to 6 in. in diameter.