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D. Maximum Slump: 4 inches for all mixes,except those containing super plasticizer. <br /> Tolerance of up to 1 inch above indicated maximum will be allowed for individual <br /> batches,provided average for all batches or most recent 10 batches tested,whichever is <br /> fewer,does not exceed maximum limit. Slump shall be determined by "Test for Slump of <br /> Portland Cement Concrete"(ASTM C143). Where field conditions or workability <br /> considerations dictate higher slump,this increased slump shall be obtained only by use of <br /> super plasticizer. Concrete shall arrive at job site at slump of 2 inches to 3 inches,be <br /> verified,and super plasticizer then added to increase slump to level indicated on approved <br /> mix design. <br /> E. Minimum Slump: 1 inch. <br /> PART 3 EXECUTION <br /> 3.1 PLACING CONCRETE <br /> A. Place concrete in accordance with ACI 301,Chapter 8. Consolidate concrete in <br /> accordance with ACI 309 using high frequency vibrators. <br /> B. Clean forms,reinforcing and accessories and dampen forms immediately prior to placing <br /> concrete. <br /> C. Schedule concrete deliveries to ensure that concrete in each load is placed within 90 <br /> minutes after mixing water is added. <br /> D. Deposit concrete as near as practicable to its final position to avoid segregation due to <br /> rehandling or flowing,in layers not exceeding 12 inch in depth,and compact each layer <br /> with vibrators. <br /> E. Do not allow concrete to fall freely more than 4 feet. Use tremies,chutes or elephant <br /> trunks where necessary. <br /> F. Exercise care to prevent"overpouring" columns. Remove column concrete which <br /> projects more than 1/2 inch into supported slab or beam. Avoid damaging reinforcing <br /> steel during removal. <br /> G. Do not use concrete that has partially hardened or been contaminated by foreign materials, <br /> nor concrete that has been retempered or remixed after initial set. <br /> H. Continue concrete work uninterrupted until completion of run so no concrete is placed <br /> against concrete that has attained its initial set,except at construction joints. <br /> I. Before depositing new concrete on or against concrete that has set at construction joints, <br /> clean,wet and apply neat cement slurry to existing surfaces. Tighten forms prior to <br /> resuming pouring. <br /> ADDENDUM#1 <br /> 1607.001 - ORONO ICE ARENA(CP-2) Page 03300-6 <br />