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h c <br /> 4 a i, € .. t '�:.,,�`:ro,vxT✓,�'.�' x" . . .. '� '^„� e�3, , �"za• a`,,.�„ . tai d x � s " � � <br />a `�' *r 1 , <br /> _, .� ?.,.�.� ^�,�"*�. .�"' _-,c _ �� "•, . :�� �j ,v§r-k � c€'+� a's+�'"k "' ��"; '"�� 'zrr .,�.E,.>'x` -m+� <br /> �, ,�'1st'r " r.' ,� ",.��r-�#'��z � s-"w`"»Y`��"t".m� -' , "�.1"+"�,y v"� <br /> SUBARTICLE 350-3 . 3 (Page 345 ) is deleted and the following substituted : <br /> 350-3 .3 Vibratory Units : Consolidate the concrete for the full width of the strip being <br /> placed with either surface pan type or internal type vibrators . Use a vibration method with <br /> sufficient intensity and duration to ensure complete consolidation of the concrete without causing <br /> segregation of the materials. <br /> For the surface vibrators , use a frequency of not less than 3 , 500 impulses per <br /> minute . For internal type vibrators, use a frequency of not less than 5 , 000 impulses per minute <br /> for tube vibrators and not less than 7 , 000 impulses per minute for spud vibrators . When using <br /> spud-type internal vibrators adjacent to forms , either hand-operated or attached to spreaders or <br /> finishing machines , use a frequency of not less than 3 , 500 impulses per minute . Measure and <br /> record the frequency of internal vibrators in plastic concrete and submit data to the Engineer. <br /> Mount spud vibrators such that the free tip trails , and space spud vibrators at a maximum interval <br /> of 30 inches . <br /> Provide an amplitude of vibration with spud vibrators that is sufficient for the <br /> vibration to be perceptible on the surface of the concrete along the entire width of the strip being <br /> placed. Measure and record the actual frequency of vibrations and submit data to the Engineer. <br /> Control all vibration by the forward movement of the spreader or finishing machine so that <br /> vibration automatically ceases when stopping the forward movement of the spreader. <br /> SUBARTICLE 350-5 . 4 (Page 347) is deleted and the following substituted : <br /> 350-5.4 Cleaning Forms : Thoroughly clean the forms after each use and before placing <br /> concrete against thein . Apply a release agent in accordance with the manufacturer ' s <br /> recommendations . <br /> ARTICLE 350- 6 (Page 347) is deleted and the following substituted : <br /> 350-6 Protection from Weather. <br /> Meet the requirements of 400- 7 . 1 when placing concrete . When rain appears imminent, <br /> stop all paving operations , and cover the surface of the unhardened concrete with the protective <br /> covering . <br /> SUBARTICLE 350- 7 . 2 (Page 347) is deleted and the following substituted : <br /> 350-7. 2 Fabric : Place welded wire reinforcement at right angles to the centerline of the <br /> pavement and accurately to the position and location shown in the plans . Lap adjacent sheets of <br /> welded wire reinforcement not less than 6 inches . Make the laps only in the longitudinal <br /> members . <br /> IL <br /> - 128 - <br /> FPID ( S ) : 423186. 1 . 58 . 01 <br /> �.» t m-z^r A x r 4 S +,�^:i n G•st` - <br /> 7777 fir t <br /> vv S A 4 <br /> 2 <br /> .x . .. . . ... I „», Z <br />