Civil MDC

Specification for Installation of Cementitious Grouting between Foundations and Equipment Bases 2

Specification for Installation of Cementitious Grouting between Foundations and Equipment Bases


Prepare concrete surface on which grout will be placed to provide a minimum 0.5 in. peak-to-valley profile, remove all laitance and microcracking from the concrete, and expose coarse aggregate. Use only small hand tools or a small pneumatic hammer with 30 lb maximum weight with a moil or chisel point to generate the profile. Nail point tools, bush or bush head bits, large jack hammers, or pavement breakers shall not be used. The surface shall be thoroughly cleaned and protected from subsequent contamination. The concrete surface shall be saturated with water and main-tained in a saturated condition for a minimum of 24 hours immediately before grouting.

3.1.2 Clear debris, dirt, and water from anchor bolt sleeves, shear key pockets, and other areas to receive grout using oil-free compressed air or vacuum.

3.1.3 For anchor bolt sleeves that are not specified to be grouted, clear debris, dirt, and water by oil-free compressed air or vacuum. Fill with nonbonding moldable materials as specified in Contract Documents.

3.1.4 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.

3.1.5 The equipment base shall be inspected to ensure that grout can be placed beneath the plate without trapping air in unvented corners. The inside of the baseplate shall be inspected where possible 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.

3.1.6 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 progress to other holes to ensure that the grout flows under all areas of the plate. Verify that holes for pumping grout are 3/4 to 2 in. in diameter and threaded for standard pipe threads. Grout holes for gravity-assisted placement of grout should be 3 to 6 in. in diameter.

3.1.7 Verify that baseplate and other metal surfaces have been prepared in accordance with the manufacturers’ requirements for grouting.

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