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["Concrete Inspection Guidelines"]
[]
["Mix Design Required","Concrete will be accepted only from concrete suppliers with"]
[null,"an City approved mix design on file. Admixtures must be in-"]
[null,"cluded in the mix design."]
[]
["Prior to placement – 1st load","1. Test slump,air, unit weight. "]
[null,"2. Failure of any of these tests are grounds to reject concrete."]
[null,"3. Wash out a handful of concrete to verify that coarse agree-"]
[null,"gate is approved material. "]
[null,"4. Cast set of cylinders from 1st load."]
[]
["Delivery tickets","Tickets must have the following information: "]
["Delivery tickets must be collected","1. Name and location of plant"]
["for all concrete prior to acceptance.","2. Size of load in CY."]
["If you are unable to collect them, ","3. Batch weights of components."]
["require the job supt. to collect them","4. Time of batching.",{"$nulls":3},"No concrete from any supplier will be accepted on any City jobsite without a City approved mix design."]
["in your absence.","5. Amount of water withheld (if any)"]
[null,"6. Mix design number - must agree with number of approved"]
[null,"mix design."]
[]
["Slump tolerance","Mix design slump +- allowable tolerance. "]
[]
["Air content tolerance","Mix design air content +- allowable tolerance "]
[]
["Unit weight tolerance","1% (no + tolerance)"]
[]
["Adding water in the field","Water may be added only 1 time per load and only at"]
["Conditions:","beginning of discharge."]
["1) Must be withheld at batch plant","1. Test slump "]
["2) Marked on delivery ticket","2. If slump is < design slump, contractor or supplier may add "]
["3) Must use calibrated bucket","water only if using a calibrated bucket."]
["KDOT 402.07 p.255 (90 Bluebook)","3. Truck driver must mark on delivery ticket amount of water "]
[null,"added and initial"]
[null,"4. Mix an additional 20-30 revs (record # add. revs on ticket)"]
[null,"5.Test air, unit weight"]
[]
["Concrete in cold weather","If ambient temperature falls below 40 degrees the following "]
["O.P.M.C.","precautionary measures must be taken: the water and/or aggregate ",{"$nulls":3}," Air temp.=< 74F: place within 1.5 hrs."]
[null,"may be heated so that conc. temp. is <50 degrees <90 degrees."]
[null,"Insulating blankets shall be required to protect concrete."]
[]
[null,"Concrete surface shall be maintained  at a  min. temp. of 50 degrees"]
[null,"for 5 days. If conc. surface  drops <50 degrees >40 degrees, conc."]
[null,"surface shall be maintained at a minimum of 40 degrees for an add- "]
[null,"itional 5 days (total of 10 days). If conc. surface temp. drops below"]
[null,"40 degrees, contractor shall be required to remove and replace"]
[null,"concrete at own expense."]
[]
["Concrete in hot weather ","Air temp <= 74 degrees F: place within 1.5 hrs."]
["Time restrictions (truck mixed)","Air temp => 75 degrees F <= 89 degrees F: place within 1 hr."]
["KDOT 402.07 p.254 (90 Bluebook)","Air temp => 75 degrees F <= 89 degrees F: place within 1.5 hr."]
[null,"with set retarder"]
[null,"Air temp.=>90 degrees F: place within 1 hr. ",{"$nulls":3}," 70 revs. =< Mixing =< 100 revs."]
[null,"Conc. Temp.=> 90 degrees F: place within 45 min."]
[]
["Mixing/agitation","Max. mixing+agitating = 300 revs."]
["KDOT 402.07 p.256 (90 Bluebook)","Min. mixing+agitating = 70 revs."]
[null,"Max agitating (plant mixed) =< 200 revs.",{"$nulls":3}," Stop operations when descending air temp=40F"]
[]
[]
[{"$nulls":5},"If withheld from load at batch plant only (and marked on delivery ticket)"]
[]
[]
[]
[]
[]
[]
[{"$nulls":5},"1. Test slump, air, yield. Wash spoil to verify that coarse aggregate is approved material. Failure of any of these tests are grounds to reject concrete."]
[]
[{"$nulls":5},"Tickets must have the following info:"]
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[{"$nulls":4}," "]

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