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Specification No . : RGS0024-87 <br /> PART II - SPECIFIC CONDITIONS <br /> Section 12 - Portland Cement <br /> Concrete Paving <br /> paving work until such conditions have been corrected and <br /> are ready to receive paving . <br /> 12 .9 Form Construction : Set forms to required grades and lines , <br /> rigidly braced and secured . Install sufficient quantity of <br /> forms to allow continuous progress of work and so that <br /> forms can remain in place at least 24 hours after concrete <br /> placement . Check completed formwork for grade and <br /> alignment to following tolerances : <br /> 12 . 9 . 1 Top of forms not more than 1/ 8" in 10 ' . <br /> 12 .9 . 2 Vertical face on longitudinal axis , not more than 1 /4" <br /> in 10 ' . <br /> Clean forms after each use , and coat with form release <br /> agent as often as required to ensure separation from <br /> concrete without damage . <br /> 12 . 10 Reinforcement : <br /> Locate , place , and support reinforcement as needed . <br /> 12 . 11 Concrete Placement : <br /> 12 . 11 . 1 General : Comply with requirements for mixing and <br /> placing concrete , and as herein specified . <br /> 12 . 12 Joints : <br /> 12 . 12 . 1 General : Construct expansion , weakened - plane <br /> (contraction) , and construction joints true-to- line with <br /> face perpendicular to surface of concrete . <br /> 12 . 12 . 2 Weakened - Plane ( Contraction ) Joints : Provide <br /> weakened-plane (contraction) joints , sectioning concrete <br /> into areas as shown on drawings . Construct <br /> weakened-plane joints for a depth equal to at least 1 / 4 <br /> concrete thickness , as follows : <br /> 12 . 12 . 2 . 1 Tooled Joints : Form weakened- plane joints in fresh <br /> concrete by grooving top portion with a recommended <br /> cutting tool and finishing edges with a jointer . <br /> XII-3 <br />