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<br /> (d) When the use of silica fume , ultrafine fly ash, or metakaolin is required
<br /> as a pozzolan in Class IV, Class V, Class V ( Special) or Class VI concrete, ensure that the
<br /> concrete exceeds a resistivity of 29 KOhm- cm at 28 days , when tested in accordance with FM 5 -
<br /> 578 . Submit three 4 x 8 inch cylindrical test specimens to the Engineer for resistivity testing
<br /> before mix design approval . Take the resistivity test specimens from the concrete of the
<br /> laboratory trial batch or from the field trial batch of at least 3 yd 3 . Verify the mix proportioning
<br /> of the design mix and take representative samples of trial batch concrete for the required plastic
<br /> and hardened property tests . Cure the field trial batch specimens similar to the standard
<br /> laboratory curing methods . Submit the resistivity test specimens at least 7 days prior to the
<br /> scheduled 28 day test. The average resistivity of the three cylinders , eight readings per cylinder,
<br /> is an indicator of the permeability of the concrete mix .
<br /> (e) When precast three - sided culverts , box culverts , endwalls , inlets ,
<br /> manholes or junction boxes require a Class III concrete, the minimum cementitious materials is
<br /> 470 lb/yd3 . Do not apply the air content range and the maximum target slump shall be 6 inches ,
<br /> except as allowed in (b) .
<br /> SUBARTICLE 346 -3 .2 (Page 322 ) the second paragraph is deleted and the following
<br /> substituted :
<br /> Test each load of concrete for slump to ensure the concrete is within the limits of
<br /> 346- 6 . 4 . Ensure that the slump loss is gradual as evidenced by slump loss tests described below .
<br /> The concrete elapsed time is the sum of the mixing and transit time, the placement time , the time
<br /> required for removal of any temporary casing that causes or could cause the concrete to flow into
<br /> the space previously occupied by the temporary casing and bolt/embedment installation .
<br /> SUBARTICLE 346-3 . 2 . 1 (Page 322) is deleted and the following substituted :
<br /> ' 346-3 . 2 . 1 Slump Loss Test Requirements : Provide slump loss tests before
<br /> drilled shaft concrete operations begin, demonstrating that the drilled shaft concrete maintains a
<br /> slump of at least 5 inches throughout the concrete elapsed time . Inform the Engineer at least 48
<br /> hours before performing such tests . Perform slump loss testing of the drilled shaft mix using
<br /> Le personnel meeting the requirements of Section 105 . The Engineer may require a new slump loss
<br /> test in the event that the temperature changes more than plus or minus 15 °F , the environmental
<br /> conditions change or the volume increases .
<br /> Perform the following procedures for slump loss tests :
<br /> ( 1 ) Begin all elapsed times when water is initially introduced into
<br /> the mixer .
<br /> (2) The slump loss test is performed at a temperature consistent
<br /> with the highest ambient and concrete temperatures expected during actual concrete placement .
<br /> This test may be used for lower temperature placements without any admixture adjustments .
<br /> (3 ) Ensure that the mix is at least 3 cubic yards and is mixed in a
<br /> truck mixer.
<br /> (4) After initial mixing, determine the slump , ambient and concrete
<br /> temperatures and air content. Ensure that the concrete properties are within the required limits as
<br /> specified in 346- 3 . 1 , Table 2 .
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