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I IIIe t I -VTI k IT Perform all concrete quality control testing and inspections in accordance with 346 - 9 . 2 . For training and other qualifications meet the requirements of Section 105 . Test all QC samples for compressive strength in a laboratory meeting the requirements of Section 105 . SUBARTICLE 410 -6 . 1 (Page 419) is deleted and the following substituted : 410-6. 1 Casting : Cast precast elements in unyielding beds and forms . Ensure bearing surfaces in casting forms are level and straight, and vertical surfaces are plumb prior to casting, Ensure surfaces within the forms against which concrete will be cast, are clean and free from rust and hardened residual concrete . Provide full concrete cover clearance to all form wires and other miscellaneous pieces of metal, except as permitted by Section 415 . Bend all tie wires away from the form surface to provide maximum concrete cover. Provide inserts and lifting devices in accordance with 450- 9 . 2 . 1 . 415 REINFORCING STEELrBAR SUPPORTS . (14540) (FA 1 -2140) (740) SUBARTICLE 415 - 5 . 13 (Pages 438 -439) is deleted and the following substituted 415-5 . 13 Bar Supports : 415-5 . 13 . 1 General: Provide reinforcing steel bar supports manufactured in accordance with all requirements of the CRSI Manual of Standard Practice . Use bar supports of IV adequate strength to withstand a 300 pound concentrated load applied as directed by the State Materials Office without permanent deformation or breakage, with the deformation under a 300 pound load being less than 5 % of the support height. Ensure that no more than 5 % of the reinforcing steel bar supports exhibit unsatisfactory performance, breakage, or permanent deformation during rebar tying and/or concrete placement operations . If a bar support does not achieve this level of performance, reduce the average spacing between bar supports by 15 % , or remove that product from use on the job . Ensure that bar supports do not move during concrete placing operations . To prevent movement, tie supports to the reinforcing steel , Ilk When using bar supports on corrugated Imetal stay- in-place forms, use supports specifically designed for the form being used. For structural elements located in extremely aggressive environments , do not use metal bar supports in contact with forms or floor surfaces to support reinforcing steel , 415-5 . 13 . 2 Metal Bar Supports : For metal bar supports in contact with steel IV I stay- in-place forms and metal bar supports in contact with boundary surfaces of concrete to be cast, provide supports constructed with molded plastic legs or plastic protected steel legs . Do not allow any portion of the bar support other than the molded plastic leg or plastic protected portion of the steel leg to be closer than 1 /2 inch from the boundary surface of concrete to be cast. Certify that all Imetal bar supports meet the following requirements : 440 - FPID ( S) : 40 - FPID ( S) : 423186 - 1 - 5 8 - 01 IV VV'IT IT It I'T I IT TI I Y: , IT