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1 1 <br /> 2 Further deck preparation shall be performed using either power driven hand tools <br /> 3 conforming to Section 6-09.3(1)A, or hydro-demolition machines conforming to Section <br /> 4 6-09.3(1)C. <br /> 5 <br /> 6 6-09.3(6)B Deck Repair Preparation I <br /> 7 The second paragraph is deleted. <br /> 8 <br /> 9 The last sentence of the second paragraph (after the preceding Amendment is applied) is <br /> 10 revised to read: <br /> 11 <br /> 12 In no case shall the depth of a sawn vertical cut exceed 3/4 inch or to the top of the top <br /> 13 steel reinforcing bars, whichever is less. <br /> 14 <br /> 15 The first sentence of the third to last paragraph is revised to read: <br /> 16 <br /> 17 Where existing steel reinforcing bars inside deck repair areas show deterioration greater <br /> 18 than 20-percent section loss, the Contractor shall furnish and place steel reinforcing <br /> 19 bars alongside the deteriorated bars in accordance with the details shown in the <br /> 20 Standard Plans. <br /> 21 <br /> 22 The last paragraph is deleted. I <br /> 23 <br /> 24 6-09.3(7) Surface Preparation for Concrete Overlay <br /> 25 The first seven paragraphs are deleted and replaced with the following: <br /> 26 <br /> 27 Following the completion of any required further deck preparation the entire lane or strip <br /> 28 being overlaid shall be cleaned to be free from oil and grease, rust and other foreign <br /> 29 material that may still be present. These materials shall be removed by detergent- <br /> 30 cleaning or other method accepted by the Engineer followed by sandblasting. <br /> 31 <br /> 32 After detergent cleaning and sandblasting is completed, the entire lane or strip being <br /> 33 overlaid shall be swept clean in final preparation for placing concrete using either <br /> 34 compressed air or vacuum machines. <br /> 35 <br /> 36 Hand tool chipping, sandblasting and cleaning in areas adjacent to a lane or strip being <br /> 37 cleaned in final preparation for placing concrete shall be discontinued when final <br /> 38 preparation is begun. Scarifying and hand tool chipping shall remain suspended until <br /> 39 the concrete has been placed and the requirement for curing time has been satisfied. <br /> 40 Sandblasting and cleaning shall remain suspended for the first 24 hours of curing time <br /> 41 after the completion of concrete placing. <br /> 42 <br /> 43 Scarification, and removal of the upper layer of concrete overlay when present, may <br /> 44 proceed during the final cleaning and overlay placement phases of the Work on <br /> 45 adjacent portions of the Structure so long as the scarification and concrete overlay <br /> 46 removal operations are confined to areas which are a minimum of 100 feet away from <br /> 47 the defined limits of the final cleaning or overlay placement in progress. If the <br /> 48 scarification and concrete overlay removal impedes or interferes in any way with the <br /> 49 final cleaning or overlay placement as determined by the Engineer, the scarification and <br /> 50 concrete overlay removal Work shall be terminated immediately and the scarification <br /> 51 and concrete overlay removal equipment removed sufficiently away from the area being <br /> 52 prepared or overlaid to eliminate the conflict. If the grade is such that water and <br /> 53 contaminants from the scarification and concrete overlay removal operation will flow into <br /> 54 the area being prepared or overlaid, the scarification and concrete overlay removal <br /> HOT MIX ASPHALT OVERLAY-2018 PAGE 20 OF 53 March 6,2018 <br /> WORK ORDER#3667 <br /> AMENDMENTS TO STANDARD PROVISIONS <br />