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<br /> 121 -2 Materials .
<br /> Meet the following requirements . In
<br /> Fine Aggregate * . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
<br />. . . . . . Section 902
<br /> Portland Cement (Types I, II, or III) . . . . . . . . . . . . . . . . . . . Section 921
<br /> ' Water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
<br /> . . . . . . . . . . . . . Section 923
<br /> >
<br /> Admixtures * * . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
<br />. . . . . . . Section 924
<br /> Fly Ash, Slag and other Pozzolanic Materials . . . . Section 929
<br /> Preformed Foam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ASTM
<br /> C 869
<br /> *Any clean fine aggregate with 100% passing a 3 / 8 inch mesh sieve and not more
<br /> than 15 % passing a No . 200 sieve may be used.
<br /> * * High air generators or foaming agents may be used in lieu of conventional air
<br /> in entraining admixtures and shall be added at jobsite and mixed in accordance with the
<br /> manufacturer ' s recommendation . 'I Ile
<br /> 121 -3 Mix Design.
<br /> In
<br /> Conventional flowable fill is a mixture of portland cement, fly ash, fine aggregate,
<br /> admixture and water. Flowable fill contains a low cementitious content for reduced strength
<br /> development . Cellular concrete flowable fill is a low density concrete made with cement, water
<br /> and preformed foam to form a hardened closed cell foam material . Cellular concrete flowable fill
<br /> may also contain fine aggregate , fly ash, slag and admixtures .
<br /> Submit mix designs to the Engineer for approval . The following are suggested mix guides
<br /> In -
<br /> for excavatable, non- excavatable and cellular concrete flowable fill :
<br /> Excavatable Non-Excavatable Cellular ConcreteI Alllee
<br /> 91 L
<br /> Cement 75400 lb/yd3 75450 lb/yd3 Min 150 lb/yd
<br /> Pozzolans or Slag None 150- 600 lb/yd Optional In
<br /> Water
<br /> Air* * 5 -35 % 545 % * * * *
<br /> , 28 Day Compressive Strength * * Maximum 100 psi Minimum 125 psi Minimum 80 psi � '
<br /> Unit Weight * * 90- 110 lb/ft3 100425 lb/ft20401b/ft
<br /> Ile
<br /> Fine Aggregate * * * * * * Optional
<br /> In
<br /> In *Mix designs shall produce a consistency that will result in a flowable self-leveling product at time of placement.
<br /> * *The requirements for percent air, compressive strength and unit weight are for laboratory designs only and are not intended for
<br /> jobsite acceptance requirements .
<br /> * * *Fine Aggregate shall be proportioned to yield 1 yd3.
<br /> * * * *In cellular concrete, preformed foam shall be proportioned at the job site to yield 1 yd3 in accordance with the design
<br /> e uirements.
<br /> In In I
<br /> 1214 Production and Placing.
<br /> Use flowable fill manufactured at a production facility that meets the requirements of
<br /> 347-3 . Deliver flowable fill using concrete construction equipment. Revolution counter are
<br /> 11 waived . Place flowable fill by chute, pumping or other methods approved by the Engineer.
<br /> 10 In
<br /> Tremie flowable fill through water. Cellular concrete flowable fill may not be placed withinIn
<br /> three feet of the bottom elevation for roadway base courses . In
<br /> 121 -5 Construction Requirements .
<br /> Use straps , soil anchors or other approved means of restraint to ensure correct alignment
<br /> when flowable fill is used as backfill for pipe or where flotation or misalignment may occur.
<br /> - 56 -
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