Laserfiche WebLink
PGSF WMVD Storm and Combined Sewer - Construction Package 2 Cast-in-Place Concrete <br />Project No. 180162 03 30 00 - 20 <br /> <br />3.11 FORMED SURFACE FINISHES <br />A. Repair Of Surface Defects: <br />1. Repair surface defects, including tie holes, minor honeycombing, or otherwise <br />defective concrete in accordance with ACI 301. Clean areas to be repaired. Cut and <br />chip out honeycombed or otherwise defective areas to solid concrete, to a depth of at <br />least 1-inch. If defective area includes exposed reinforcing steel, correct by removing <br />concrete a minimum of 1-inch beyond the reinforcing. Make edges of the cut <br />perpendicular to the surface of the concrete in a neat rectangular pattern. <br />2. Joints shall be grooved to a radius or bevel of ¾-inch depth. <br />3. Finish patches on exposed surfaces to match and blend with adjoining work. Cure <br />patches as specified for the concrete. Protect finished surfaces from stains and <br />abrasions. <br />B. Formed Surface Finishes: <br />1. Finish A - Grout Rubbed Finish <br />a. After repair of surface defects, apply a grout rubbed finish in accordance with <br />ACI 301 except that all form fins and other protrusions shall be completely <br />removed. Lightly sandblast surfaces prior to sacking. Sandblasting shall occur <br />after the specified curing period. <br />b. Add a PVA bonding compound to the mix water used in sacking mortar; as <br />recommended by the manufacturer. <br />c. Provide Finish A at uncoated surfaces of stair wells, at interior surfaces of <br />equipment rooms, galleries, tunnels, operations areas, exposed channels and <br />tanks from 1 foot below minimum water surfaces and up, at exposed exterior <br />surfaces to 1 foot below grade, and at permanently exposed vertical and sloped <br />surfaces such as pipe chases. <br />d. Do not provide Finish A at concrete surfaces receiving a coating. <br />2. Finish B - Smooth Surface Finish <br />a. Initial surface preparation is the same as Finish A; repair surface defects and <br />remove all form fins. <br />b. Provide Finish B at surfaces to be coated, at interior surfaces of exposed <br />channels and tanks from 1 foot below minimum water surfaces and down (Finish <br />A applied above this level), and full height at surfaces of wet wells, tanks, and <br />channels not exposed to view. See Section 09 96 00 for additional concrete <br />surface preparation, including filling of bug holes, and coating requirements. <br />3. Finish C - Rough Form Finish <br />a. Repair surface defects and imperfections greater than 3/8 inch in any <br />dimension. Remove form fins and protrusions down to less than 3/8 inch <br />projection. <br />b. Provide Finish C or smoother at exterior surfaces from 1 foot below grade and <br />down, at other vertical surfaces not exposed to view and not specified above to <br />receive Finish A or B. <br />c. Also apply Finish C to unoccupied interior areas not otherwise specified.