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1 <br />:l <br />t <br />E. Remove imperfect texture, laitance, fins and roughness by rubbing affected <br />areas with concrete block or carborundum stone until smooth and uniform. <br />F. Holes 1/4 inch to 3/4 inch in their greatest dimension, which are not more <br />than 1 inch deep, shall be cleaned to match the color of the concrete when <br />dry. Deeper holes shall be repaired only after the Engineer has approved <br />their effect on structural integrity. <br />G. Obtain approval of the Engineer before performing repair work other than <br />the removal of imperfect texture, filling of pin holes, holes less than 3/4 inch <br />wide, and insert holes. The Engineer will determine whether the defective <br />area is sufficiently imperfect to warrant rejection of the structural unit. <br />H. For defects that are not subject to rejection, clean the holes, honeycombed <br />areas, cracks, spalls, and discolored areas of oily or bondbreaking <br />substances. Roughen or key the surface of each defect and coat the <br />bottom and sides with a non - staining acrylic or epoxy bonding agent. Cut <br />back spalled loose porous material until coarse aggregate will break under <br />chipping rather than non - shrinking grout or epoxy- portland cement intrusion <br />grout which has been formulated to match the color of the concrete when <br />dry. Tamp grout and strike off color of the concrete when dry. Tamp grout <br />and strike off flush with surrounding concrete without smearing. Confine the <br />grout until cured keeping it damp when exposed to sun or other rapid <br />drying. <br />3.20 PROTECTION FROM AND REMOVAL OF STAINS: <br />A. Protect the concrete structure from rust staining by structural steel members <br />and from other substances during the work. Do no allow dirt to accumulate <br />on horizontal surfaces where it can be washed down over vertical surfaces <br />by rain. Keep flat surfaces swept clean. <br />B. If staining does occur, remove stain and restore the concrete to its original <br />color and finish. <br />3.21 FINISHING OF FORMED SURFACES: <br />A. After removal of forms, finish the surface of the concrete, as indicated, in a <br />manner as specified below. <br />B. All exposed concrete shall be cast and finished as appearance grade <br />concrete except the following: <br />1. Surfaces which are covered with earth and which are more than 12 <br />inches below finish grade. <br />03300 -19 <br />05 -5564 <br />