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+i • Y A. Admixtures other than for air entrainment shall not be used without the specific written approval of [lie Engineer. 7. 11011MS A. Forms shall be built to provide a neat and workmanlike finishes{ job. The ' forms shall be mortar -tight and of sufficient strength material to prevent arty bulging or sagging from true line and grade and to withstand vibrating. Any form ties shall be removed to a depth of at least 1 112 inches, the holes reamed out large enough to be adequately patched and the hole filled with sand cement rnortar. S. 111,AC1:MEN'1' AND I NSPEMON A, Tile Contractor shall give tie Engineer sufficient advance notice of his intent to pour concrete to permit inspection of the forms, placement of reinforcing steel, and equipment for mixing, transporting and placing of tile concrete. No concrete will be placed prior to completion of the form work and piacing of the reinforcing to tie Engineer's satisfaction. No concrete shall be placed unless all adequate vibrator and adequate provisions for curing are on [land. Concrete test cylinders will be trade by the Engineer's representative at random and at any title there is doubt about tite quality of tike concrete. Failure of tike concrete to come up to design strength will be cause for rejec- tion and replacement of the structure. l3. Every effort shall be made to obtain a water tight and durable concrete free from voids, rock pockets and the like. Should defects occur, they will be called to the Engineer's attention and repaired hl accordance with his directive or, if extensive replaced. C. Concrete finish on exposed surfaces shall be as designated by the Engineer. y. REINFORCING A. All reinforcing steel shall be fabricated fronh new billet steel and shall unless otherwise noted confortu to ASTM designation A615, Grade 40. All bars shall be securely tied in place will, soft iron wire, 16 gage or heavier. No steel chairs will be permitted. Unless otherwise rioted all bars shall have 2 inches of concrete cover. All bends shall be in accordance with the A.C.I. Building Code. 10. CURING A. (lei The The concrete shall he col,tinuously cured for a period of at least 7 days. Curing shall be cotnnrenced after finishing has been completed and as soon as the concrete Ilan hardened -sufficiently to permit application of tie curing material without marring ti,e surface. Any curing material removed or damaged during the 7 day period shall be replaced innnediately. After forms are removed, the surfaces exposed shall he cured by placing a berm of moist earth Against theist or by any of the methods deseribed below, for the remainder of the 7 clay curing period. 1) Wet Burlap Method: Burlap shall be placed over the entire exposed surface of the concrete with sufficient extension beyond each side to 01307-2