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PGSF WMVD Storm and Combined Sewer - Construction Package 2 Cast-in-Place Concrete <br />Project No. 180162 03 30 00 - 9 <br /> <br />3. Provide concrete mix designs in accordance with the following guidelines: <br /> <br />Concrete <br />class <br />Minimuma <br />28-day <br />compressive <br />strength, psi <br />ASTM coarse <br />aggregate <br />size <br />Maximum <br />water- <br />cementitious <br />materials <br />(w/cm) ratio <br />Minimum <br />cementitious <br />materials <br />content <br />(pounds/CY) <br />Pozzolan, <br />percent by <br />weight of <br />cementitious <br />materials <br />Air content <br />(percent) <br />Slump <br />rangef <br />(inches) <br />Max Density <br />(pcf) <br />Bc 3000 57 or 67 0.45 560 15-25d 4-6 3-5 - <br />C-1 4500 57 or 67 0.40 560 15-25 4-6 3-5 - <br />C-2 5000 57 or 67 0.42 560 15-25d 4-6 3-5] - <br />E 2000 57 -- - 15-25d Not Required 4-8 - <br />G 5000 67 0.45 660 15-40 Not Required 6-9g - <br />a Determine compressive strength at the end of 28 days based on test cylinders made and tested in accordance with <br />ASTM C39. <br />b Compressive strength of Class A concrete may be determined at 56 days. <br />c Concrete encasement for electrical conduit shall contain 3 pounds of red oxide per sack of cement. <br />d Pozzolan use is optional for this class of concrete. <br />e Minimum 28-day compressive strength shall be 500 psi and maximum 28-day compressive strength shall be 1,000 psi. <br />f Slump before addition of high range water reducing admixture (superplasticizer). Maximum slump after addition of high <br />range water reducing admixture shall be 8”. <br />g Do not use high-range water reducing admixtures for Class G concrete. <br />B. Use: <br />1. Provide concrete by class for the uses listed below. <br /> <br />Concrete class Type of use <br />B Non-structural concrete (sidewalks, curbs, pavers, etc.), electrical conduit encasement (duct banks). <br />C-1 Typical cast-in-place structural concrete <br />C-2 Precast concrete <br />Ea Pipe bedding and encasement and concrete fill <br />G Tremie slab concrete <br />a Contractor’s option to use the same concrete mix for pipe encasement as the concrete slab above. <br />C. Control Tests: <br />1. General: <br />a. Select and adjust proportions of ingredients in accordance with ACI 211.1. <br />Verification of mix characteristics for submittal may be achieved using either the <br />Trial Mix Design method or Field Experience Data method. Do not place concrete <br />prior to submittal and acceptance of proposed mix.