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1 In lieu of precast concrete supports, the Contractor may use metal or all-plastic supports <br /> 2 to hold uncoated bars. Any surface of a metal support that will not be covered by at <br /> 3 least 1/2 inch of concrete shall be one of the following: <br /> 4 <br /> 5 The tenth paragraph is revised to read: <br /> 6 <br /> 7 in lieu of precast concrete supports, epoxy-coated reinforcing bars may be supported by <br /> 8 one of the following: <br /> 9 <br /> 10 1. Metal supports coated entirely with a dielectric material such as epoxy or <br /> 11 plastic, <br /> 12 <br /> 13 2. Other epoxy-coated reinforcing bars, or <br /> 14 <br /> 15 3. All-plastic supports. <br /> 16 <br /> 17 The following new paragraph is inserted after the tenth paragraph: <br /> 18 <br /> 19 Damaged coatings on metal bar supports shall be repaired prior to placing concrete. <br /> 20 <br /> 21 The twelfth paragraph (after the preceding Amendment is applied) is revised to read: <br /> 22 <br /> 23 All-plastic supports shall be lightweight, non-porous, and chemically inert in concrete. <br /> 24 All-plastic supports shall have rounded seatings, shall not deform under load during <br /> 25 normal temperatures, and shall not shatter or crack under impact loading in cold <br /> 26 weather. All-plastic supports shall be placed at spacings greater than 1 foot along the <br /> 27 bar and shall have at least 25 percent of their gross place area perforated to <br /> 28 compensate for the difference in the coefficient of thermal expansion between plastic <br /> 29 and concrete. The shape and configuration of all-plastic supports shall permit complete <br /> 30 concrete consolidation in and around the support. <br /> 31 <br /> 32 The thirteenth paragraph (after the preceding Amendment is applied) is revised to read: <br /> 33 <br /> 34 A"mat" is two adjacent and perpendicular layers of reinforcing steel. In bridge decks, <br /> 35 top and bottom mats shall be supported adequately enough to hold both in their proper <br /> 36 positions. If bar supports directly support, or are directly supported on No. 4 bars, they <br /> 37 shall be spaced at not more than 3-foot intervals (or not more than 4-foot intervals for <br /> 38 bars No. 5 and larger). Wire ties to girder stirrups shall not be considered as supports. <br /> 39 To provide a rigid mat, the Contractor shall add other supports and tie wires to the top <br /> 40 mat as needed. <br /> 41 <br /> 42 6-02.3(27) Concrete for Precast Units <br /> 43 The last sentence of the first paragraph is revised to read: <br /> 44 <br /> 45 Type III portland cement or blended hydraulic cement is permitted to be used in precast <br /> 46 concrete units. <br /> 47 <br /> 48 6-02.3(28)B Curing <br /> 49 In the second paragraph, the reference to Section 6-02.3(25)B is revised to read Section 6- <br /> 50 02.3(25)C. <br /> 511 <br /> WEST MARINE VIEW DRIVE UTILITIES PAGE 19 OF 60 August 2018 <br /> WORK ORDER# 3588 <br /> WSDOT AMENDMENTS Rev 4/2/18 <br />