Rodarte Construction Inc Everett Station Parking Expansion

I I1 In lieu of precast concrete supports, epoxy-coated reinforcing bars may be supported by 2 one of the following: 13 4 1. Metal supports coated entirely with a dielectric material such as epoxy or plastic, 5 I 6 2. Other epoxy-coated reinforcing bars, or 7 8 3. All-plastic supports. 9 10 11 Damaged coatings on metal bar supports shall be repaired prior to placing concrete. 12 All-plastic supports shall be lightweight, non-porous, and chemically inert in concrete. All- I 13 14 plastic supports shall have rounded seatings, shall not deform under load during normal temperatures, and shall not shatter or crack under impact loading in cold weather. All- 15 plastic supports shall be placed at spacings greater than 1 foot along the bar and shall have 16 at least 25 percent of their gross place area perforated to compensate for the difference in 17 the coefficient of thermal expansion between plastic and concrete. The shape and 18 configuration of all-plastic supports shall permit complete concrete consolidation in and 19 around the support. I 20 21 A "mat" is two adjacent and perpendicular layers of reinforcing steel. In bridge decks, top 22 and bottom mats shall be supported adequately enough to hold both in their proper I 23 positions. If bar supports directly support, or are directly supported on No. 4 bars, they shall 24 be spaced at not more than 3-foot intervals (or not more than 4-foot intervals for bars No. 5 25 and larger). Wire ties to girder stirrups shall not be considered as supports. To provide a I 26 rigid mat, the Contractor shall add other supports and tie wires to the top mat as needed. 27 28 Unless noted otherwise, the minimum concrete cover for main reinforcing bars shall be: 29 30 31 3 inches to a concrete surface deposited against earth without intervening forms. 32 21/2 inches to the top surface of a concrete bridge deck or bridge approach slab. I 33 34 2 inches to a concrete surface when not specified otherwise in this section or in the 35 Contract documents. i 36 37 11/ inches to a concrete barrier or curb surface. 38 39 Except for top cover in bridge decks and bridge approach slabs, minimum concrete cover 40 to ties and stirrups may be reduced by 1/2 inch but shall not be less than 1 inch. Minimum 41 concrete cover shall also be provided to the outermost part of mechanical splices and 42 headed steel reinforcing bars. I 43 44 Reinforcing steel bar location, concrete cover and clearance shall not vary more than the 45 following tolerances from what is specified in the Contract documents: II 46 47 Reinforcing bar location for members 12 inches or less in thickness: ±0.25 inch 48 49 Reinforcing bar location for members greater than 12 inches in thickness: ±0.375 inch I 50 I City of Everett Page AM 41 Amendments Everett Station 80 Stall Parking Expansion June 2019 I