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' 1 2. Give all trades whose work is related to the concrete ample notice and opportunity to 2 introduce embedded items before concrete is placed. 3 a 3. Position expansion joint material, waterstops, and embedded items accurately and 5 support them against displacement. Fill voids in sleeves, inserts, and anchor slots 6 temporarily with readily removable material to prevent the entry of concrete. 1 7 e 3.08 FORM REMOVAL s io Carefully remove forms to insure the complete safety of the structure. Where the structure 11 is supported by shoring, the beam sides, columns, or other vertical forms may be removed 12 after 24 hours, providing the concrete will not be injured. All supporting forms shall remain 13 in place for a minimum of 10 days. Do not remove supporting forms or shoring until ' 14 members have acquired sufficient strength to support their weight and imposed loads safely. 15 16 3.09 REPAIRING AND PATCHING n is A. Clean, thoroughly dampen and patch all tie holes and all repairable defects immediately after 19 form removal. 20 21 B. All honeycombed and other defective concrete shall be removed to sound concrete with 22 edges perpendicular to the surface. Surface imperfections greater than 3/8 inch in any 23 dimension shall be removed and the affected areas neatly patched. Dampen the area to be ' 24 patched and an area at least 6 inches wide surrounding it to prevent absorption of water 25 from the patching mortar. Mix patching grout to the consistency of thick cream and brush 26 it well into the surface. 27 28 C. Make the patching mortar of the same material and approximately the same proportions as 29 used for the concrete, omitting the coarse aggregate. The resultant mortar shall consist of 30 not more than 1 part cement to 2-1/2 parts sand by damp loose volume. 31 32 D. Do not use more mixing water than necessary for handling and placing. Mix the patching 33 mortar in advance and allow to stand with frequent manipulation with a trowel, without adding 34 water, until it has reached the stiffest consistency that will permit placing. 35 36 E. After surface water has evaporated from the area to be patched, brush the patching grout 37 well into the surface. When the patching grout begins to lose the water sheen, apply the 38 premixed patching mortar. The mortar shall be thoroughly consolidated into place and struck 39 off to leave the patch slightly higher than the surrounding surface. To permit initial 40 shrinkage, leave the patch undisturbed for at least 1 hour before finishing it. Keep the 41 patched area damp for 7 days. Do not use metal tools in finishing a patch in a formed wall 42 which will be exposed. 43 44 F. Tie Holes: Clean thoroughly, dampen, then fill solid with patching mortar. Mortar shall match 45 color of concrete. Fill tie holes prior to finishing. 46 47 3.10 FINISHES FOR FORMED SURFACES 48 49 A. Rough Form Finish: Leave surface with texture imparted by the forms on foundation walls 50 below finished grade. 51 ' 52 B. Surfaces to be waterproofed shall be finished in accordance with requirements and CONCRETE 1 042894 03100-13