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I <br /> 1 • Areas that are not on top Roadway surfaces (with or without an overlay) I <br /> 2 including but not limited to concrete bridge decks, bridge approach slabs <br /> 3 or cement concrete pavement <br /> 4 <br /> 5 • Areas that are not underwater <br /> 6 <br /> 7 • Areas that are not on precast barrier, except for the bottom 4 inches (but <br /> 8 not to exceed 1 inch above blockouts) <br /> 9 <br /> 10 • Areas that do not affect structural adequacy as determined by theI <br /> 11 Engineer. <br /> 12 <br /> 13 The repair procedure is as follows: <br /> 14 <br /> 15 1. Remove all loose and unsound concrete. Impact breakers shall not <br /> 16 exceed 15 pounds in weight when removing concrete adjacent to <br /> 17 reinforcement or other embedments and shall not exceed 30 pounds in <br /> 18 weight otherwise. Operate impact breakers at angles less than 45 <br /> 19 degrees as measured from the surface of the concrete to the tool and <br /> 20 moving away from the edge of the defective Work. Concrete shall be <br /> 21 completely removed from exposed surfaces of existing steel reinforcing <br /> 22 bars. If half or more of the circumference of any steel reinforcing bar is <br /> 23 exposed, if the reinforcing bar is loose or if the bond to existing concrete111 <br /> 24 is poor then concrete shall be removed at least 3/4 inch behind the <br /> 25 reinforcing bar. Do not damage any existing reinforcement. Stop work <br /> 26 and allow the Engineer to inspect the repair area after removing all loose I <br /> 27 and unsound concrete. Submit a modified repair procedure when <br /> 28 required by the Engineer. <br /> 29 <br /> II <br /> 30 2. Square the edges of the repair area by cutting an edge perpendicular to <br /> 31 the concrete surface around the repair area. The geometry of the repair <br /> 32 perimeter shall minimize the edge length and shall be rectangular with <br /> 33 perpendicular edges, avoiding reentrant corners. The depth of the cut <br /> 34 shall be a minimum of% inch, but shall be reduced if necessary to avoid <br /> 35 damaging any reinforcement. For repairs on vertical surfaces, the top I 36 edge shall slope up toward the front at a 1-vertical-to-3-horizontal slope. <br /> 37 <br /> 38 3. Remove concrete within the repair area to a depth at least matching the <br /> 39 cut depth at the edges. Large variations in the depth of removal within111 <br /> 40 short distances shall be avoided. Roughen the concrete surface. The <br /> 41 concrete surface should be roughened to at least Concrete Surface <br /> 42 Profile (CSP) 5 in accordance with ICRI Guideline No. 310.2R, unless a <br /> 43 different CSP is recommended by the patching material manufacturer. <br /> 44 <br /> 45 4. Inspect the concrete repair surface for delaminations, debonding, <br /> 46 microcracking and voids using hammer tapping or a chain drag. Remove <br /> 47 any additional loose or unsound concrete in accordance with steps 1 <br /> 48 through 3. <br /> 49 111 <br /> 50 5. Select a patching material in accordance with Section 9-20.2 that is <br /> 51 appropriate for the repair location and thickness. The concrete patching <br /> I <br /> City of Everett Page AM-30 Amendments <br /> Everett Downtown Streetscape Improvement March 22, 2019 <br />