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H1 <br />If'c (t) = Average Core Strength at time t (psi) <br />t =time compressive strength was measured (days) <br />346- 11.6.3 Slag- Cement Concrete: <br />Equivalent 28 -day compressive strength = f'c (28) , where: <br />( 7.06 1 U <br />f'c (28) = 0.794 x f'c, (t)x e ` (Type I Cement) <br />6.02 aaa <br />f'c (28) = 0.730 x f'c. (t)x e� (Type II Cement) <br />236 o.c� <br />f c (28) = 0.826 x f c (t)x e (Type III Cement) <br />f'c (t) = Average Core Strength at time t (psi) <br />t =time compressive strength was measured (days) <br />346 -11.7 Calculating Pay Adjustments: The Engineer will determine payment <br />reductions for low strength concrete, accepted by the Department and represented by <br />either cylinder or core strength test results below the specified minimum strength, in <br />accordance with the following: <br />Reduction in Pay is equal to the reduction in percentage of concrete cylinder <br />strength (specified minimum strength minus actual strength divided by specified minimum <br />strength). <br />For the elements that payments are based on the per foot [meter] basis, the <br />Engineer will adjust the price reduction from cubic yards [cubic meters] basis to per foot <br />[meter] basis, determine the total linear feet [meter] of the elements that are effected by <br />low strength concrete samples and apply the adjusted price reduction accordingly. <br />347 PORTLAND CEMENT CONCRETE — CLASS I (NONSTRUCTURAL). <br />(REV 8 -3 -05) (FA 8 -9 -05) (1 -06) <br />SECTION 347 (Pages 301 -304) is deleted and the following substituted: <br />SECTION <br />PORTLAND CEMENT CONCRETE - CLASS I <br />(NONSTRUCTURAL) <br />347 <br />(' 347 -1 Description. <br />The requirements of this Section are applicable to concrete designated as Class I <br />(Nonstructural), hereinafter referred to as concrete. Use concrete composed of a mixture of <br />portland cement, aggregates, and water, with or without chemical admixtures, slag, or <br />pozzolanic materials. Deliver concrete to placement site in a freshly mixed, unhardened <br />111� <br />March 2007 01000 -108 03- 4122.D <br />! <br />