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<br />,.., <br />L.J <br />" <br /> B. <br />LJ <br />" <br />LJ <br />n C. <br />L.J <br />" <br />LJ <br />" <br /> D. <br />LJ <br />n <br />L.J <br /> E. <br />n <br />LJ <br />II <br />U <br />" <br />L.J <br />n <br />L.J <br />" <br />L.J <br />" <br />L.J F. <br />n <br />LJ <br />n <br />L.J <br />" G. <br />L.J <br />" <br />L.J <br />n <br />L.J <br />06/05 <br />n <br />LJ <br /> <br />As soon as the forms have been stripped and the concrete surfaces exposed, fins and other <br />projections shall be removed, recesses left by the removal of form ties (except where ties <br />are left in place during sandblasting) shall be filled and surface defects which do not impair <br />structural strength shall be repaired. Clean all exposed concrete surfaces and adjoining <br />work stained by leakage of concrete, to approval of the Engineer. <br /> <br />Immediately after removal of forms remove plugs and break off metal ties as required by <br />Paragraph 3.06. Holes are then to be promptly filled upon stripping as follows: Moisten <br />the hole with water, followed by a 1/16 inch brush coat of neat cement slurry mixed to the <br />consistency of a heavy paste. Immediately plug the holes with I 1.5 mixture of cement and <br />concrete sand mixer slightly damp to the tough Gust short of "balling"). Hammer the grout <br />into the hole until dense, and an excess of paste appears on the surface in the form of a <br />spider web. Trowel smooth with heavy pressure. A void burnishing. <br /> <br />Rub lightly with a fine carborundum stone at an age of I to 5 days if necessary to bring the <br />surface down with the parent concrete. Exercise care to avoid damaging or straining the <br />virgin skin of the surroul)<ling parent concrete. Wash thoroughly to remove all rubbed <br />matter. <br /> <br />Defective concrete and honeycombed areas shall be chipped reasonably square and at least <br />I inch deep to sound concrete by means of hand chisels or pneumatic chipping hammers. <br />Irregular voids or surface stones need not be removed if they are sound, free of laitance, <br />and firmly embedded in the parent concrete, subject to Engineer's final inspection. If <br />honeycomb exists around reinforcement, chip to provide a clear space at least 3/8 inch wide <br />all around the steel. For areas less than 1 1/2 inch deep, the patch may be made in the same <br />manner as described above for filling for tie holes, care being exercised to use adequately <br />dry (non-trowelable) mixtures and to avoid sagging. Thick repairs will require build-up in <br />successive I 1/2 inch layers on successive days, each layer being applied (with slurry, etc.) <br />as described above. To aid strength and bonding of the multiple layer repairs, the Engineer <br />may order the use of Embeco non-shrink, metallic aggregate by the Master Builders <br />Company, Cleveland, OH or lronite by Fox Industries, Madison IL as an additive as <br />follows: <br /> <br />Material <br />Cement <br />Embeco <br />Sand <br /> <br />Volumes <br />1.0 <br />0:15 <br />1.5 <br /> <br />Weights <br />1.0 <br />0.25 <br />1.5 <br /> <br />For very heavy (generally formed) patches; the Engineer may order the addition of pea <br />gravel to the mixture and the proportions modified as follows: <br /> <br />Material <br />Cement <br />Embeco <br />Sand <br />Pea Gravel <br /> <br />Volumes <br />1.0 <br />0.2 <br />1.0 <br />1.5 <br /> <br />Weights <br />1.0 <br />0.33 <br />1.0 <br />1.5 <br /> <br />In cases where the Embeco is employed in multiple patches and a rusty finish is not desired <br />on the surface, such as exposed faces of walls, etc., the final layer (or at least the final 1/2 <br />inch) shall be composed of the 1 1.5 grout without Embeco. After hardening, rub lightly as <br />described above for form tie holes. <br /> <br />03300-12 <br /> <br />03-4138.8 <br />