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<br />.... <br /> <br />. <br /> <br />PI <br />. will be randomly confirmed by the Department. If there is no verification data for a LOT, <br />then the LOT goes to Resolution Investigation to determine conformance with 346-9. <br /> <br />..., <br />. <br /> <br />.., <br />. <br /> <br />II <br /> <br />I <br />. <br /> <br />" <br />. <br /> <br />I <br /> <br />" <br />. <br /> <br />,., <br />. <br /> <br />,..., <br />. <br /> <br />..., <br />. <br /> <br />..., <br /> <br />. <br /> <br />..., <br /> <br />. <br /> <br />.., <br /> <br />. <br /> <br />II <br /> <br />. <br /> <br />-. <br />. <br /> <br />,.., <br />. <br /> <br />..., <br /> <br />. <br /> <br />n <br /> <br />. <br /> <br />if ABLE 9 <br />Class Concrete Maximum LOT Size <br />I (Pavement) one lane mile [1.5 lane km] or one day's <br />production, whichever is less <br />I (Special) 1 50 yd3 [1 25 m3] or one day's production, <br />whichever is less <br />II, II (Bridge Deck), III, IV, IV (Drilled Shaft), V 50 yd3 [40 m3], or one day's production, <br />(Special), V, VI whichever is less <br />III (Seal) Each Seal placement <br /> <br />346-9.2.1 Reduced Frequency for Acceptance Tests: For all structural <br />concrete except Class I and III (Seal), if the previous 15 consecutive strength test results <br />of the same design mix produced at the same concrete production facility, on a given <br />Contract have all been verified and have attained an average strength greater than two <br />standard deviations above the specified minimum, then the maximum LOT size will be <br />increased to 100 yd3 [80 m3]. <br />The average of 15 consecutive breaks can be established based on historical <br />data from the previous project. The data must also represent the same prime/sub <br />contractor. The last test from the previous job must be within the last 60 calendar days. <br />Test data must be from a laboratory meeting the requirements of 6-9. <br />The average of 15 consecutive compressive strength test results can also be <br />established by a succession of samples on the current project. Only one sample can be <br />taken from each LOT. <br />If at any time a strength test is not verified and/or the average strength of <br />the previous 1 5 consecutive samples is less than the specified minimum plus two standard <br />deviations, the maximum LOT size will return to 50 yd3 [40 m3]. The maximum LOT size <br />will remain 50 yd3 [40 m3] until the thresholds listed above are achieved. <br />346-9.3 Strength Test Definition: The strength test of a LOT is defined as the <br />average of the compressive strengths tests of three cylinders cast from the same sample <br />of concrete from the LOT. <br />346-9.4 Acceptance of Hardened Concrete: Hardened concrete will be accepted or <br />rejected on the basis of strength test results as defined in 346-9.3. Do not discard a <br />cylinder strength test result based on low strength (strength below the specified minimum <br />strength as per the provisions of 346-3 and 346-9). When QC strength test results are <br />verified, the Engineer will accept the concrete based on QC test results. The Engineer will <br />accept at full pay only LOTs of concrete represented by strength test results which equal <br />or exceed the respective specified minimum strength. <br />When one of the three QC cylinders from a LOT is lost, damaged or <br />destroyed, determination of compressive strength will be made by averaging the remaining <br />two cylinders. If more than one QC cylinder from a LOT is lost, damaged or destroyed, the <br />Contractor will core the structure at no additional expense to the Department to determine <br />the compressive strength. Acceptance of the LOT may be based on verification data at the <br />discretion of the Engineer. Obtain the approval of the Engineer to core, and of the core <br />location prior to drilling. <br /> <br />09/09 <br /> <br />01000-104 <br /> <br />03-4122.F <br />