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2 3. El assemblies, reinforcement, or side forms. Use only square -faced shovels for hand -spreading and consolidation. Consolidate with care to prevent dislocation of reinforcing, dowels, and joint devices. Do not use vibrators to push or move concrete in forms or chute. Deposit and spread concrete in a continuous operation between transverse joints, as far as possible. If interrupted for more than one-half hour, place a construction joint. Curbs and Gutters: Automatic machine may be used for curb and gutter placement at Contractor's option. If machine placement is to be used, submit revised mix design and laboratory test results which meet or exceed the minimum herein specified. Machine placement must produce curbs and gutters to the required cross-section, lines, grades, finish, and jointing as specified for formed concrete. If results are not acceptable, remove and replace with formed concrete as specified. Joints: Construct expansion, weakened -plane (contraction), and construction joints true -to -line with face perpendicular to surface of the concrete, unless otherwise indicated. Construct transverse joints at right angles to the centerline, unless otherwise indicated. When joining existing structures, place transverse joints to align with previously -placed joints, unless otherwise indicated. a• Weakened -Plane Joints: Provide weakened -plane (contraction) joints sectioning concrete into areas where required. Construct weakened -plane joints for a depth equal to at least one-quarter concrete thickness, by sawing within 24 hours of placement or formed during finishing operations. Place joints at intervals not to exceed 10 feet, if not otherwise indicated. b• Construction Joints: Place construction joints at the end of all pours and at locations where placement operations are stopped for a period of more than one-half hour, except where such pours terminate at expansion joints. Construction joints shall be as shown or, if not shown, use standard metal keyway -section form of appropriate height. C. Expansion Joints: (1) Provide premolded joint filler for expansion joints abutting concrete curbs, catch basin, manholes, inlets, structures, walks, and other fixed objects, unless otherwise indicated. (2) Locate expansion joints at 30 feet o.c. for concrete walks, unless otherwise indicated. (3) Extend joint fillers full width and depth of joint, and not less than one-half inch below finished surface where joint sealer is indicated. If no joint sealer, place top of joint filler flush with finished concrete (4) surface. Furnish joint fillers in one-piece lengths for the full width being placed, wherever possible. Where more than one length is required, lace or clip joint filler sections together. Pieces shorter than four inches shall not- be 02576-6