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40 <br />r <br />2.02 CONCRETE MIX, DESIGN AND TESTING <br />A. Design mix to produce standard -weight concrete <br />consisting of portland cement, 3/41" aggregate, air - <br />entrained admixture and water to produce the following <br />properties: <br />1. Compressive Strength; 3000psi, minimum at 28 days. <br />2. Slump Range: 2" to 411. <br />3. Air Content: 5t to Bt. <br />4. Water reducing or other supplemental admixtures <br />will not be allowed. <br />5. Pea rock pump -mix will not be allowed for any slabs <br />on grade. <br />PART 3 - EXECUTION <br />3.01 SURFACE PREPARATION <br />A. Remove loose material from compacted subbase surface <br />immediately before placing concrete. <br />B. Proof -roll prepared subbase surface to check for <br />unstable areas and need for additional compaction. Do <br />not begin paving work until such conditions have been <br />corrected and are ready to receive concrete. <br />C. Set forms to required grades and lines, rigidly braced <br />and secured. Install sufficient quantity of forms to <br />allow continuous progress of work and so that forms <br />can remain in place at least 24 hours after concrete <br />placement.. <br />D. Check completed formwork for grade and alignment to <br />following tolerances: <br />Top of forms not more that 1/9" in 101. <br />Vertical face on longitudinal axis, not more than 1/4" <br />in 10'. <br />Clean forms after each use, and coat with form release <br />agent as often as required to ensure separation from <br />concrete without damage. <br />3.02 CONCRETE PLACEMENT: <br />A. General: Comply with requirements of Division 3 <br />sections for mixing and placing concrete, and as <br />herei na�,pec f ier3 <br />B. Do not place concrete until subbase and forms have <br />been checked for line and grade. Moisten subbase if <br />required to provide a uniform dampened condition at <br />time concrete is placed. .Do not place concrete around <br />manholes or other structures until they are at <br />required finish elevation and alignment. <br />C. Place concrete using methods which prevent segregation <br />of mix. consolidate concrete along face of forms and <br />adjacent to transverse joints with internal vibrator. <br />Keep vibrator away from joint assemblies, reinforce- <br />ment, or side forms. Use only square -faced shovels <br />02515-2 <br />