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I I I I I I I I I I I I I I I I I I I maximum time limit between the batching and when the concrete of each batch is deposited during the production. Upon the review and verification of the laboratory trial batch, field demonstration test data, inspection reports and contractor's certification statement, the Department will approve the proposed mix design. The Department may approve proposed flowing concrete mixes, centrally mixed at the placement site, without the production of demonstration batches, provided that the proposed mix meets the following two criteria: (1) A previously approved flowing concrete mix of the same class has demonstrated satisfactory performance under the proposed job placing conditions with a minimum of fifteen consecutive Department acceptance tests, which met all plastic and hardened concrete test requirements. (2) The cementitious materials and chemical admixtures, including the flowing concrete HRWR admixture, used in the proposed mix are the same materials from the same source used in the previously approved mix, (1) above, and the other materials and mix proportions are approved as similar by the Department. Do not produce or place concrete until the design mixes have been approved. 346-2.5.4 Corrosion Inhibitor Admixture: Use only with concrete containing Type II cement, Class F fly ash or slag, and a water reducing retardant admixture, Type 0, or High Range Water Reducer admixture, Type G, to normalize the setting time of concrete. Ensure that all admixtures are compatible with the corrosion inhibitor admixture. 346-3 Classification, Strength, Slump and Air Content. 346-3.1 General: The separate classifications of concrete covered by this Section are designated as Class I, Class II, Class III, Class IV, Class V and Class VI. Strength, slump, and air content of each class are specified in Table 2: TABLE 2 Specified Minimum Target Slump Air Content Range Class of Concrete Strength (28-day) (psi) [(MPa)] (inches) [(mm)](c) (e) (%) STRUCTURAL CONCRETE I (Pavement) 3,000 [21] 2 [50] 1 to 6 I (Special) (a) 3,000 [21] 3 [75] (b) 1 to 6 II (a) 3,400 [23] 3 [75] (b) 1 to 6 II (Bridge Deck) 4,500 [31] 3 [75] (b) 1 to 6 III 5,000 [35] 3 [75] (b) 1 to 6 III (Seal) 3,000 [21] 8 [200] 1 to 6 IV 5,500 [38] 3 [75] (b) 1 to 6 IV (Drilled Shaft) 4,000 [28] 8 [200] o to 6 V (Special) 6,000 [41] 3 [75] (b) (d) 1 to 5 V 6,500 [45] 3 [75] (b) (d) 1 to 5 VI 8,500 [59] 3 [75] (b) (d) 1 to 5 March 2007 01000-92 03-4122.D