Reso 2007-1103 - Laserfiche WebLink

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will be randomly confirmed by the Department. If there is no verification data for a LOT, then the LOT goes to Resolution Investigation to determine conformance with 346 -9. TABLE 9 Class Concrete Maximum LOT Size one lane mile [1.5 lane km] or one day's I (Pavement) production, whichever is less 150 yd 3. [125 m3] or one day's production, I (Special) whichever is less ll, II (Bridge Deck), III, IV, IV (Drilled Shaft), V50 yd' [40 m3], or one day's production, (Special), V, VI whichever is less III (Seal) Each Seal placement 346 -9.2.1 Reduced Frequency for Acceptance Tests: For all structural concrete except Class I and III (Seal), if the previous 15 consecutive strength test results of the same design mix produced at the same concrete production facility, on a given Contract have all been verified and have attained an average strength greater than two standard deviations above the specified minimum, then the maximum LOT size will be increased to 100 yd' [80 m3]. The average of 15 consecutive breaks can be established based on historical data from the previous project. The data must also represent the same prime /sub contractor. The last test from the previous fob must be within the last 60 calendar days. Test data must be from a laboratory meeting the requirements of 6 -9. 'j The average of 15 consecutive compressive strength test results can also be established by a succession of samples on the current project. Only one sample can be taken from each LOT. I If at any time a strength test is not verified and /or the average strength of the previous 15 consecutive samples is less than the specified minimum plus two standard deviations, the maximum LOT size will return to 50 yd3 [40 m3]. The maximum LOT size will remain 50 yd [40 m3] until the thresholds listed above are achieved. 346 -9.3 Strength Test Definition: The strength test of a LOT is defined as the average of the compressive strengths tests of three cylinders cast from the same sample of concrete from the LOT. 346 -9.4 Acceptance of Hardened Concrete: Hardened concrete will be accepted or rejected on the basis of strength test results as defined in 346 -9.3. Do not discard a cylinder strength test result based on low strength (strength below the specified minimum strength as per the provisions of 346 -3 and 346 -9). When QC strength test results are verified, the Engineer will accept the concrete based on QC test results. The Engineer will accept at full pay only LOTs of concrete represented by strength test results which equal or exceed the respective specified minimum strength. When one of the three QC cylinders from a LOT is lost, damaged or destroyed, determination of compressive strength will be made by averaging the remaining two cylinders. If more than one QC cylinder from a LOT is lost, damaged or destroyed, the Contractor will core the structure at no additional expense to the Department to determine the compressive strength. Acceptance of the LOT may be based on verification data at the discretion of the Engineer. Obtain the approval of the Engineer to core, and of the core location prior to drilling. March 2007 01000 -104 03- 4122.D r