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<br />Copyright 2002 AIA <br /> <br />MASTERSPEC Short Form <br /> <br />08/02 (R 05/06) <br /> <br />3.6 CONCRETE PLACEMENT <br /> <br />A. Before placing concrete, verify that installation of formwork, reinforcement, and embedded <br />items is complete and that required inspections have been performed. <br /> <br />B. Deposit concrete continuously in one layer or in horizontal layers of such thickness that no new <br />concrete will be placed on concrete that has hardened enough to cause seams or planes of <br />weakness. If a section cannot be placed continuously, provide construction joints as indicated. <br />Deposit concrete to avoid segregation. <br /> <br />1. Consolidate placed concrete with mechanical vibrating equipment according to ACI 301. <br /> <br />C. Cold-Weather Placement: Comply with ACI 306.1. <br /> <br />D. Hot-Weather Placement: Comply with ACI 301. <br /> <br />3.7 FINISHING FORMED SURFACES <br /> <br />A. Rough-Formed Finish: As-cast concrete texture imparted by form-facing material with tie holes <br />and defects repaired and patched. Remove fms and other projections that exceed specified <br />limits on formed-surface irregularities. <br /> <br />1. Apply to concrete surfaces [not exposed to public view] <Insert locations>. <br /> <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 />defects. Remove fms and other projections that exceed specified limits on formed-surface <br />irregularities. <br /> <br />1. Apply to concrete surfaces [exposed to public view,] [to receive a rubbed finish,] [to <br />be covered with a coating or covering material applied directly to concrete] <Insert <br />locations> . <br /> <br />C. Rubbed Finish: Apply the following to smooth-formed finished as-cast concrete where <br />indicated: <br /> <br />1. Smooth-Rubbed Finish: Not later than one day after form removal, moisten concrete <br />surfaces and rub with carborundum brick or another abrasive until producing a uniform <br />color and texture. Do not apply cement grout other than that created by the rubbing <br />process. <br />2. Grout-Cleaned Finish: Wet concrete surfaces and apply grout of a consistency of thick <br />paint to coat surfaces and fill small holes. Mix one part portland cement to one and one- <br />half parts fine sand with a 1: 1 mixture of bonding admixture and water. Add white <br />portland cement in amounts determined by trial patches so color of dry grout will match <br />adjacent surfaces. Scrub grout into voids and remove excess grout. When grout whitens, <br />rub surface with clean burlap and keep surface damp by fog spray for at least 36 hours. <br />3. Cork-Floated Finish: Wet concrete surfaces and apply a stiff grout. Mix one part <br />portland cement and one part fine sand with a 1: 1 mixture of bonding agent and water. <br />Add white portland cement in amounts determined by trial patches so color of dry grout <br /> <br />CAST -IN-PLACE CONCRETE <br /> <br />03300 - 7 <br />