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t <br />1 <br />D. Rub lightly with a fine carborundum stone at an age of I to 5 days if <br />necessary to bring the surface down with the parent concrete. <br />Exercise care to avoid damaging or straining the virgin skin of the <br />surrounding parent concrete. Wash thoroughly to remove all rubbed <br />1 <br />matter. <br />E. Defective concrete and honeycombed areas shall be chipped <br />1 <br />reasonably square and at least 1 inch deep to sound concrete by <br />means of hand chisels or pneumatic chipping hammers. Irregular voids <br />or surface stones need not be removed if they are sound, free of <br />laitance, and firmly embedded in the parent concrete, subject to <br />Engineer's final inspection. If honeycomb exists around reinforcement, <br />chip to provide a clear space at least 3/8 inch wide all around the <br />' <br />steel. For areas less than 1 1/2 inch deep, the patch may be made in <br />the same manner as described above for filling for tie holes, care being <br />exercised to use adequately dry (nontrowelable) mixtures and to avoid <br />sagging. Thick repairs will require build -up in successive 1 1/2 inch <br />layers on successive days, each layer being applied (with slurry, etc.) <br />as described above. To aid strength and bonding of the multiple layer <br />' <br />repairs, the Engineer may order the use of Embeco non - shrink, metallic <br />aggregate by the Master Builders Company, Cleveland, OH or Ironite <br />by Fox Industries, Madison IL as an additive as follows: <br />Material Volumes Weights <br />Cement 1.0 1.0 <br />' <br />Embeco 0.15 0.25 <br />Sand 1.5 1.5 <br />' <br />F. For very heavy (generally formed) patches; the Engineer may order the <br />addition of pea gravel to the mixture and the proportions modified as <br />follows: <br />Material Volumes Weights <br />Cement 1.0 1.0 <br />Embeco 0.2 0.33 <br />' Sand 1.0 1.0 <br />Pea Gravel 1.5 1.5 <br />' G. In cases where the Embeco is employed in multiple patches and a <br />rusty finish is not desired on the surface, such as exposed faces of <br />walls, etc., the final layer (or at least the final 1/2 inch) shall be <br />' composed of the 1 1.5 grout without Embeco. After hardening, rub <br />lightly as described above for form tie holes. <br />' 07/03 03300 -16 03- 3148.A <br />