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Copyright 2004 AIA MASTERSPEC - SHORT FORM 02/04 C. Locate at least three reinforcing bars using a pachometer, and drill test holes to determine depth of cover. Calibrate pachometer, using depth of cover measurements, and verify depth of cover in removal areas using pachometer. 3.2 PREPARATION A. Protect people, motor vehicles, equipment, surrounding construction, Project site, plants, and surrounding buildings from injury resulting from concrete rehabilitation work. 1. Neutralize and collect alkaline and acid wastes according to requirements of authorities having jurisdiction, and dispose of by legal means off Owner's property. 2. Dispose of runoff from wet operations by legal means and in a manner that prevents soil erosion, undermining of paving and foundations, damage to landscaping, and water penetration into building interiors. B. Shoring: Install temporary supports before beginning concrete removal. C. Concrete Removal: 1. Saw-cut perimeter of areas indicated for removal to a depth of at least [1/2 inch (13 mm)] <Insert depth>. Make cuts perpendicular to concrete surfaces and no deeper than cover on reinforcement. 2. Remove deteriorated and delaminated concrete by breaking up and dislodging from reinforcement. 3. Remove additional concrete, if necessary, to provide a depth of removal of at least [1/2 inch (13 mm)] <Insert depth> over entire removal area. 4. Where half or more of the perimeter of reinforcing bar is exposed, bond between reinforcing bar and surrounding concrete is broken, or reinforcing bar is corroded, remove concrete from entire perimeter of bar and to provide at least a 3/4-inch (l9-nm1) clearance around bar. 5. Test areas where concrete has been removed by tapping with hammer, and remove additional concrete until unsound and disbonded concrete is completely removed. 6. Provide fractured aggregate surfaces with a profile of at least 1/8 inch (3 mm) that are approximately perpendicular or parallel to original concrete surfaces. At columns and walls, make top and bottom surfaces level, unless otherwise directed. 7. Thoroughly clean removal areas of loose concrete, dust, and debris. D. Reinforcing Bar Preparation: Remove loose and flaking rust from reinforcing bars by [high- pressure water cleaning] [ahrasive hlast cleaning] [needle scaling] [or] [wire hrushing] until only tightly bonded light rust remains. 1. Where section loss of reinforcing bar is more than 25 percent, or 20 percent in 2 or more adjacent bars, cut bars and remove and replacer as directed hy Architect]. Remove additional concrete as necessary to provide at least 314-inch (l9-mm) clearance at existing and replacement bars. Splice replacement bars to existing bars according to ACI 318 (ACI 318M), by lapping, welding, or using mechanical couplings. E. Preparation of Floor Joints for Repair: Saw-cut joints full width to edges and depth of spalls, but not less than [3/4 inch (19 mm)] [I inch (25 mm)] [2 inches (50 mm)] <Insert depth> deep. Clean out debris and loose concrete; vacuum or blow clear with compressed air. CONCRETE REHABILITATION 03930 - 9