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3 . 02 CONCRETE PLACEMENT : <br /> A . General : <br /> Comply with requirements of Division 3 sections for mixing and placing concrete, <br /> and as herein specified . <br /> Be Do not place concrete until subbase and forms have been checked for line and <br /> grade . Moisten subbase if required to provide a uniform dampened condition at <br /> time concrete is placed. Do not place concrete around manholes or other structures <br /> until they are at required finish elevation and alignment. <br /> C . Place concrete using methods which prevent segregation of mix . Consolidate <br /> concrete along face of forms and adjacent to transverse joints with internal vibrator. <br /> Keep vibrator away from joint assemblies, reinforcement, or side forms . Use only <br /> square-faced shovels for hand- spreading and consolidation. Consolidate with care <br /> to prevent dislocation of reinforcing, dowels , and joint devices . <br /> D . Deposit and spread concrete in a continuous operation between transverse joints, as <br /> far as possible. If interrupted for more than '/2 hour, place a construction joint . Do <br /> not use concrete pumps unless they are capable of delivering 3 /4 " rock mix. <br /> 3 . 03 JOINTS : <br /> A . General : <br /> Construct expansion, weakened-plane (contraction), and construction joints true-to- <br /> line with face perpendicular to surface of concrete . Construct transverse joints at <br /> right angles to the centerline, unless otherwise indicated . <br /> Be Tooled Joints : <br /> Form weakened-plane joints in fresh concrete by grooving top portion with a <br /> recommended cutting tool and finishing edges with a jointer. <br /> CO Construction Joints : <br /> Place construction joints at the end of pours and at locations where placement <br /> operations are stopped for a period of more than %2 hour, except where such pours <br /> terminate at expansion joints . <br /> D . Sawcut Control Joints shall be cut a minimum of 1 " deep within 24 hours of <br /> concrete placement and located per drawings . <br /> 3 . 04 CONCRETE FINISHING <br /> A . After striking-off and consolidating concrete, smooth surface by screeding and <br /> floating . Use hand methods only where mechanical floating is not possible . Adjust <br /> floating to compact surface and produce uniform texture . <br /> 02515-3 <br />