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IV
<br /> 6 , 501 — 8 , 500 psi 1 , 275 psi
<br /> Greater than 8 , 500 psi 1 , 360 psi
<br /> SUBARTICLE 346 - 9 . 2 (Pages 334 — 335 ) is deleted and the following substituted :
<br /> ,` r 346-9 .2 Sampling Frequency :
<br /> As a minimum, sample and test concrete of each design mix for water to
<br /> cementitious materials ratio, air content, temperature, slump and compressive strength once per
<br /> LOT as defined by Table 8 . When more than one concrete production facility is used for the
<br /> same mix design, describe the method of sampling, testing and LOT numbering in the QC Plan .
<br /> The Engineer will randomly verify one of every four consecutive LOTs of each design mix
<br /> based on a random number generator. The Department may perform Independent Verification
<br /> testing to verify compliance with specification requirements . All QC activities , calculations , and
<br /> inspections will be randomly confirmed by the Department.
<br /> TABLE 8IV
<br /> Class Concrete Maximum LOT Size
<br /> I one day ' s production �`
<br /> I (Pavement) 250 lane ft, or one day ' s production, whichever is
<br /> less
<br /> II, lI (Bridge Deck) , III, IV, V ( Special) , 3
<br /> V, VI 50 yd , or one days production , whichever is less
<br /> N (Drilled Shaft) 50 yd3 , or two hours between placements , whichever
<br /> is less
<br /> III ( Seal) Each Seal placement
<br /> 346-9.2 . 1 Reduced Frequency for Acceptance Tests : When ten consecutive I VI
<br /> strength test results from the same mix design for a Class N or higher class of concrete are
<br /> produced at the same concrete production facility, on a given Contract have all been verified and
<br /> have attained an average strength greater than two standard deviations above the specified
<br /> minimum, then the LOT may represent a maximum production quantity of 100 yd3 . When five
<br /> consecutive strength test results from the same mix design for a Class III or lower class of
<br /> concrete is produced at the same concrete production facility on a given Contract have all been
<br /> verified and have attained an average strength greater than two standard deviations above the
<br /> specified minimum, the LOT may represent a maximum production quantity of 100 yd3 .
<br /> The average of the consecutive compressive strength test results , based on
<br /> the class of concrete, can be established using historical data from a previous Department
<br /> project. The data must also represent the same prime/subcontractor. The tests from the previous
<br /> Department project must be within the last 60 calendar days or may also be established by a
<br /> succession of samples on the current project. Only one sample can be taken from each LOT . Test
<br /> data must be from a laboratory meeting the requirements of Section 105 .
<br /> If at any time a strength test is not verified and/or the average strength of
<br /> the previous ten or five consecutive samples based on the class of concrete described above,
<br /> - 124-
<br /> FPID ( S ) : 423186 - 1 - 58 -01
<br /> 7� 5777b
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