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J. Where sawcut control joints in exterior slabs on grade are shown,provide in accordance <br /> with ACI 301-11.5, 1/4 depth of slabs unless shown otherwise. Cut joints to their full <br /> depth as soon as condition of concrete will permit,in 2 or more passes,with first pass cut <br /> 1/2 inch deep. <br /> K. Provide control joints in poured in place concrete curbs 10 feet o.c. maximum spacings <br /> with expansion joints not over 40 feet o.c. Make control joints by cutting approximately <br /> 1/8 inch wide by 1 inch to 1-1/2 inch deep into exposed surfaces. Expansion joints shall <br /> be 1/2 inch wide with joint filler. At curbs adjacent to sidewalks,align joints in curb and <br /> sidewalk. <br /> L. Unless noted or detailed otherwise provide for expansion joints in sidewalks at intervals <br /> not to exceed 40 feet on centers and where walks abut curbs,stoops,walls or other fixed <br /> objects. Expansion joints shall be 1/2 inch wide using filler materials. Provide tooled <br /> weak plane joints across sidewalks, 1 inch deep by 1/4 inch at 5 feet intervals,unless <br /> otherwise noted. Tool edges of joints to 1/8 inch radius. <br /> 3.3 FINISHING <br /> A. Finish bare concrete floors(adjacent to floors with other surfacing)so concrete surface is <br /> level with other finishes,unless otherwise noted. <br /> B. Grind smooth joints between slabs on grade and structural slabs and between existing and <br /> new surfaces just prior to installation of floor covering to eliminate unevenness and to <br /> provide smooth,level surface across joints. <br /> C. Protect finished surfaces from damage. Keep free of abrasive materials. <br /> D. Set screeds by instruments with firm, stable supports,but not mortar mounds. Place <br /> concrete to accurate screeds,with screed lines filled. <br /> E. Start finishing when concrete has hardened sufficiently to permit use of mechanical rotary <br /> finisher and finishing machines shall thoroughly compact and level concrete,using 2 to 4 <br /> passes of machine. <br /> F. Follow with steel troweling when steel troweling is specified. <br /> G. In areas where water will be present(interior and exterior)place and finish slabs so areas <br /> will drain and water will not stand in puddles.Conform to slopes shown.At structural <br /> slabs,verify elevations of drains to insure drains will be at low points. Where elevations <br /> and slopes are not indicated,generally slope floors 1/8 inch per foot uniformly to drains, <br /> unless otherwise directed by Architect. <br /> H. Scratch Finish: Apply scratch finish to monolithic slab surfaces to receive concrete floor <br /> topping or mortar setting beds for tile,portland cement terrazzo, and other bonded applied <br /> cementitious finish flooring material,and where indicated. After placing slabs, finish <br /> ADDENDUM#1 <br /> 1607.001 - ORONO ICE ARENA(CP-2) Page 03300-9 <br />