Granite Construction Company 5/1/2018

1 1 2 In slabs, each precast concrete support shall have either: (1) a grooved top that will hold 3 the reinforcing bar in place, or (2) an embedded wire that protrudes and is tied to the111 4 reinforcing steel. 5 6 The eighth paragraph is revised to read: 7 8 Precast concrete supports may be accepted based on a Manufacturer's Certificate of 9 Compliance. 10 11 The ninth paragraph (excluding the numbered list) is revised to read: 12 13 In lieu of precast concrete supports, the Contractor may use metal or all-plastic supports 14 to hold uncoated bars. Any surface of a metal support that will not be covered by at 15 least 1/2 inch of concrete shall be one of the following: 16 17 The tenth paragraph is revised to read: 18 19 In lieu of precast concrete supports, epoxy-coated reinforcing bars may be supported by 20 one of the following: 21 22 1. Metal supports coated entirely with a dielectric material such as epoxy or 23 plastic, 24 25 2. Other epoxy-coated reinforcing bars, or 26 27 3. All-plastic supports. 28 29 The following new paragraph is inserted after the tenth paragraph: 30 31 Damaged coatings on metal bar supports shall be repaired prior to placing concrete. 32 33 The twelfth paragraph (after the preceding Amendment is applied) is revised to read: 34 35 All-plastic supports shall be lightweight, non-porous, and chemically inert in concrete. 36 All-plastic supports shall have rounded seatings, shall not deform under load during 37 normal temperatures, and shall not shatter or crack under impact loading in cold 38 weather. All-plastic supports shall be placed at spacings greater than 1 foot along the 39 bar and shall have at least 25 percent of their gross place area perforated to 40 compensate for the difference in the coefficient of thermal expansion between plastic 41 and concrete. The shape and configuration of all-plastic supports shall permit complete 42 concrete consolidation in and around the support. 43 44 The thirteenth paragraph (after the preceding Amendment is applied) is revised to read: 45 46 A "mat" is two adjacent and perpendicular layers of reinforcing steel. In bridge decks, 47 top and bottom mats shall be supported adequately enough to hold both in their proper 48 positions. If bar supports directly support, or are directly supported on No. 4 bars, they 49 shall be spaced at not more than 3-foot intervals (or not more than 4-foot intervals for 50 bars No. 5 and larger). Wire ties to girder stirrups shall not be considered as supports. 51 To provide a rigid mat, the Contractor shall add other supports and tie wires to the top 52 mat as needed. 53 54 HOT MIX ASPHALT OVERLAY-2018 PAGE 16 OF 53 March 6,2018 WORK ORDER#3667 AMENDMENTS TO STANDARD PROVISIONS