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CHAPEL HILL ORANGE COUNTY VISITORS BUREAU August 12, 2020 <br />308 WEST FRANKLIN, CHAPEL HILL, NC <br /> <br />MISCELLANEOUS CAST-IN-PLACE CONCRETE 033053 - 6 <br />3.6 CONCRETE PLACEMENT <br />A. Comply with ACI 301 (ACI 301M) for placing concrete. <br />B. Before test sampling and placing concrete, water may be added at Project site, subject to <br />limitations of ACI 301 (ACI 301M). <br />C. Do not add water to concrete during delivery, at Project site, or during placement. <br />D. Consolidate concrete with mechanical vibrating equipment. <br />3.7 FINISHING FORMED SURFACES <br />A. Rough-Formed Finish: As-cast concrete texture imparted by form-facing material with tie holes <br />and defective areas repaired and patched. Remove fins and other projections exceeding 1/2 inch <br />(13 mm). <br />1. Apply to concrete surfaces not exposed to public view. <br />B. Smooth-Formed Finish: As-cast concrete texture imparted by form-facing material, arranged in <br />an orderly and symmetrical manner with a minimum of seams. Repair and patch tie holes and <br />defective areas. Remove fins and other projections exceeding 1/8 inch (3 mm). <br />1. Apply to concrete surfaces exposed to public view, or to be covered with a coating or <br />covering material applied directly to concrete. <br />C. Rubbed Finish: Apply the following rubbed finish, defined in ACI 301 (ACI 301M), to <br />smooth-formed finished as-cast concrete where indicated: <br />D. Related Unformed Surfaces: At tops of walls, horizontal offsets, and similar unformed surfaces <br />adjacent to formed surfaces, strike off smooth and finish with a texture matching adjacent <br />formed surfaces. Continue final surface treatment of formed surfaces uniformly across adjacent <br />unformed surfaces, unless otherwise indicated. <br />3.8 FINISHING UNFORMED SURFACES <br />A. General: Comply with ACI 302.1R for screeding, restraightening, and finishing operations for <br />concrete surfaces. Do not wet concrete surfaces. <br />B. Screed surfaces with a straightedge and strike off. Begin initial floating using bull floats or <br />darbies to form a uniform and open-textured surface plane before excess moisture or bleedwater <br />appears on surface. <br />1. Do not further disturb surfaces before starting finishing operations. <br />C. Scratch Finish: Apply scratch finish to surfaces indicated and surfaces to receive concrete floor <br />topping or mortar setting beds for ceramic or quarry tile, portland cement terrazzo, and other <br />bonded cementitious floor finishes, unless otherwise indicated. <br />DocuSign Envelope ID: 775B89AF-3514-4D9E-B148-2FDE4EFF16C2