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( 5 ) Verify the water to cementitious materials ratio and other <br /> delivery ticket data meet design mix requirements . <br /> (6) Mix the concrete intermittently for 30 seconds every 5 minutes , <br /> at a speed greater than or equal to the midrange of the manufacturer' s recommended mixing <br /> speed. When concrete is not being mixed, agitate the mixer at the midrange of the manufacturer' s <br /> recommended agitating speed. <br /> ( 7) Determine slump, ambient and concrete temperatures at 30 <br /> minute intervals until the slump is 5 inches or less . Remix the mix for one minute at the mixing <br /> speed of the mixer before these tests are run . <br /> ( 8 ) Ensure that the concrete maintains a slump of at least 5 inches <br /> for the anticipated elapsed time . <br /> (9) Cast cylinders to determine when 500 psi compressive strength <br /> is obtained for the purpose of transporting field samples to the laboratory . <br /> ( 10) Obtain the Engineer ' s approval of slump loss test results in <br /> terms of elapsed time before concrete placements . <br /> SUBARTICLE 3464 . 2 . 2 (Page 326) is deleted and the following substituted : <br /> 346-4 .2 . 2 Certification : If any chloride test data exceeds the limits in Table 4 , <br /> identify the exception on the Construction Compliance with Specifications and Plans form . <br /> SUBARTICLE 346- 6 . 1 (Page 328 ) is deleted and the following substituted : <br /> 346-6 . 1 General : Develop a Quality Control Plan (QCP) as specified in Section 105 . <br /> Meet the requirements of the approved QCP and Contract Documents . Ensure the QCP includes <br /> the necessary requirements to control the quality of the concrete . <br /> Perform QC activities to ensure materials , methods , techniques , personnel , <br /> procedures and processes utilized during production meet the specified requirements . For <br /> precast/prestressed operations , ensure that the QC testing is performed by the producer. <br /> Accept the responsibility for QC inspections on all phases of work. Ensure all <br /> materials and workmanship incorporated into the project meet the requirements of the Contract <br /> Documents . <br /> When concrete plastic properties (slump , air content and temperature) could be <br /> significantly affected by handling between the point of delivery and the point of final placement, <br /> including the use of pumps , conveyor belts , troughs , chutes , barge transport or other means , <br /> include provisions in the QCP to sample the plastic concrete for all testing at the point of final <br /> placement. <br /> Ensure the QCP includes any anticipated requirements for adjusting the concrete <br /> at the placement site . Include the testing procedures that will be implemented to control the <br /> quality of the concrete and ensure that concrete placed is within the tolerance range . Also , <br /> include provisions for the addition of water to concrete delivered to the placement site at <br /> designated level areas , to ensure the allowable amount of water stated on the concrete delivery <br /> ticket or the maximum water to cementitious materials ratio on the approved design mix are not <br /> exceeded. Ensure the anticipated ranges of jobsite water additions are described and the proposed <br /> methods of measuring water for concrete adjustments are included. <br /> - 119 - <br /> FPID ( S ) : 423186 - 1 - 58 -01 <br /> �i <br />