Laserfiche WebLink
u <br />maximum time limit between the batching and when the concrete of each batch is <br />deposited during the production. <br />Upon the review and verification of the laboratory trial batch, <br />field demonstration test data, inspection reports and contractor's certification statement, <br />the Department will approve the proposed mix design. <br />The Department may approve proposed flowing concrete <br />jmixes, centrally mixed at the placement site, without the production of demonstration <br />batches, provided that the proposed mix meets the following two criteria: <br />(1) A previously approved flowing concrete mix of the same <br />class has demonstrated satisfactory performance under the proposed job placing conditions <br />with a minimum of fifteen consecutive Department acceptance tests, which met all plastic <br />and hardened concrete test requirements. <br />(2) The cementitious materials and chemical admixtures, <br />including the flowing concrete HRWR admixture, used in the proposed mix are the same <br />materials from the same source used in the previously approved mix, (1) above, and the <br />other materials and mix proportions are approved as similar by the Department. <br />Do not produce or place concrete until the design mixes have <br />been approved. <br />346 -2.5.4 Corrosion Inhibitor Admixture: Use only with concrete containing <br />Type II cement, Class F fly ash or slag, and a water reducing retardant admixture, Type D, <br />or High Range Water Reducer admixture, Type G, to normalize the setting time of <br />concrete. Ensure that all admixtures are compatible with the corrosion inhibitor admixture. <br />346 -3 Classification, Strength, Slump and Air Content. <br />346 -3.1 General: The separate classifications of concrete covered by this Section <br />are designated as Class I, Class II, Class III, Class IV, Class V and Class VI. Strength, <br />slump, and air content of each class are specified in Table 2: <br />TABLE 2 <br />Class of Concrete <br />Specified Minimum <br />Strength (28 -day) (psi) <br />[(MPa)] <br />Target Slump <br />(inches) [(mm)](c) (e) <br />Air Content Range <br />o <br />( /o) <br />STRUCTURAL CONCRETE <br />I (Pavement) <br />3,000 [21 ] <br />2 [50] <br />1 to 6 <br />1 (Special) (a) <br />3,000 [21 ] <br />3 [751 (b) <br />1 to 6 <br />II (a) <br />3,400 [23] <br />3 [75] (b) <br />1 to 6 <br />II (Bridge Deck) <br />4,500 [311 <br />3 [751 (b) <br />1 to 6 <br />III <br />5,000 [351 <br />3 [751 (b) <br />1 to 6 <br />III (Seal) <br />3,000 [211 <br />8 [200] <br />1 to 6 <br />IV <br />5,500 [38] <br />3 [75] (b) <br />1 to 6 <br />IV (Drilled Shaft) <br />4,000 [281 <br />8 [200] <br />0 to 6 <br />V (Special) <br />6,000 [41 ] <br />3 [751 (b) (d) <br />1 to 5 <br />V <br />6,500 [45] <br />3 [751 (b) (d) <br />1 to 5 <br />VI <br />18,500 [59] <br />3 [751 (b) (d) <br />1 to 5 <br />March 2007 01000 -92 03- 4122.D ?' <br />