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2. Surfaces which are encased in other materials. <br />3. Surfaces which are to receive waterproofing. <br />4. Interior exposed concrete surfaces of shafts, pits, sumps, equipment <br />rooms, storage rooms. <br />C. Appearance Grade Concrete: Use smooth MDO plywood or steel form. Do <br />not use form facing with raised grain, torn surfaces, worn edges, patches, <br />dents, or other defects that will impair the texture of the concrete surface. <br />Patch tie holes and defects. Remove fins completely. <br />3.22 SLAB PLACEMENT AND JOINTING <br />A. Coordinate time of mixing and placing with finishing. <br />B. Locate joints in interior slabs on grade maximum spacing as shown on the <br />drawings. <br />C. Locate joints in slabs on grade at 20 -foot intervals in both directions unless <br />other spacing is shown on drawings. <br />D. Where sawed joints are indicated, saw joints as soon as the concrete has <br />hardened sufficiently to prevent aggregates from being dislodged. <br />Complete cutting before shrinkage stresses cause cracking. <br />E. Consolidate concrete in slabs using internal vibrators, vibrating screeds, <br />and other means that eliminate air pockets, fully embed reinforcement, and <br />retain sufficient coarse and fine aggregate at and near the top surface. <br />F. Do not displace reinforcement during placement and vibrating of concrete. <br />Maintain at middle of slab thickness. <br />G. Do not puncture moisture barrier during placement and vibrating of <br />concrete. <br />3.23 FINISHING SLABS: <br />A. After concrete has been consolidated, finish surface in a manner as <br />specified below. <br />B. Where a finish is not indicated for cast -in -place concrete slabs, provide a <br />troweled finish. <br />07/06 03300 -20 05 -5564 <br />