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I <br /> practicable to its final location to avoid segregation due to rehandling or flowing. Do not <br /> subject concrete to any procedure,which will cause segregation. <br /> 2. Screed concrete which is to receive other construction to the proper level to avoid excessive <br /> skimming or grouting. <br /> 3. Do not use concrete which becomes non-plastic and unworkable or does not meet the <br /> required quality control limits or which has been contaminated by foreign materials. Do <br /> not use retempered concrete. Remove rejected concrete from the project site and dispose <br /> of in an acceptable location. Do not use concrete whose allowable mixing time has been <br /> exceeded. <br /> C. <br /> PlacingConcrete into Forms <br /> 1. Deposit concrete in forms in horizontal layers not deeper than 24 inches and in a manner <br /> to avoid inclined construction joints. Where placement consists of several layers, place <br /> each layer while preceding layer is still plastic to avoid cold joints. <br /> 2. Do not interrupt successive placement;do not permit cold joints to occur. <br /> 3. Remove temporary spreaders in forms when concrete placing has reached the elevation of <br /> such spreaders. <br /> 4. Consolidate concrete placed in forms by mechanical vibrating equipment supplemented by <br /> hand spading, rodding or tamping. Use equipment and procedures for consolidation of <br /> concrete in accordance with the recommended practices of ACI 309, to suit the type of <br /> concrete and project conditions. Vibration of forms and reinforcing will not be permitted. <br /> 5. Do not use vibrators to transport concrete inside of forms. Insert and withdraw vibrators <br /> vertically at uniformly spaced locations not farther than the visible effectiveness of the <br /> machine. Place vibrators to rapidly penetrate the layer of concrete at least six (6) inches <br /> • into the preceding layer. Do not insert vibrators into lower layers of concrete that have <br /> begun to set. At each insertion, limit the duration of vibration to the time necessary to <br /> consolidate the concrete and complete embedment of reinforcement and other embedded <br /> items without causing segregation of the mix. <br /> 6. Do not place concrete in supporting elements until the concrete previously placed in <br /> columns and walls is no longer plastic. <br /> D. Cold Weather Placing <br /> 1. Protect all concrete work from physical damage or reduced strength which could be caused <br /> by frost,freezing actions,or low temperatures,in compliance with the requirements of ACI <br /> 306 and as herein specified. <br /> 2. When the air temperature has fallen to or is expected to fall below 40°F,provide adequate <br /> 1 <br /> means to maintain the temperature in the area where concrete is being placed at either 70°F <br /> Legion Golf Course Stormwater Detention Project Concrete Work <br /> WO#UP3620 03 11 00 -6 <br />