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1 3. Continue all reinforcing steel and mesh across construction joints. , <br /> 2 <br /> 3 4. Construction joints shall be made rough and all laitance removed from the surface by <br /> 4 chipping the entire surface, sandblasting with coarse silica sand, or hosing the surface , <br /> 5 4 to 6 hours after the pour with a fine spray, exposing solidly embedded clean <br /> 6 aggregate. Forms and reinforcing shall likewise be cleaned of drippings, debris, etc., <br /> 7 by means of compressed air. Surfaces of the hardened concrete shall be cleaned to , <br /> 8 the satisfaction of the Engineer and wet as required before placing of new concrete. <br /> 9 Just before starting the new pour, all free water shall be removed and the horizontal <br /> 10 surfaces shall be covered with at least 4 inch thickness of concrete composed of cement , <br /> 11 and fine aggregate, omitting the coarse aggregate. Cement content of such mortar shall <br /> 12 be increased to a least 7-1/2 sacks per cubic yard. <br /> 13 <br /> 14 B. Expansion Joints: , <br /> 15 <br /> 16 1. Install expansion joint fillers to 1/2 inch below slab. <br /> 17 <br /> 18 2. Where shown, load transfer dowels shall consist of plain bars with one half coated with ' <br /> 19 an approved anti-bond coating. The coated half shall be sleeved. No other <br /> 20 reinforcement or metal shall extend continuously through the joint. <br /> 21 '22 C. Waterstops: <br /> 23 <br /> 24 I. The design and location of waterstops shall be as shown. Each piece of pre-molded , <br /> 25 waterstop shall be of maximum practicable length to minimize the number of end joints. <br /> 26 Embed center bulb in the center of joint. <br /> 27 <br /> 28 2. Make joints at intersections and at ends of pieces following manufacturer's instructions. , <br /> 29 Joints shall develop effective water-tightness fully equal to that of the continuous <br /> 30 waterstop material and shall develop not less than 50 percent of the mechanical strength <br /> 31 of the parent section. Do not lap sections of waterstop. All joints shall be butt spliced ' <br /> 32 using a heat sealing method. <br /> 33 <br /> 34 3. Support waterstops securely against displacement by wire tie between the last rib and <br /> 35 the end of the waterstop, or method specifically recommended by the manufacturer. , <br /> 36 <br /> 37 4. If joint is not watertight after construction, one or both of the following shall be done to <br /> 38 provide a watertight joint: <br /> 39 <br /> 40 a. Grouting of the joint by drilling grout holes to the center of the structure unit and <br /> 41 forcing epoxy grout into the joint under pressure. ' <br /> 42 <br /> 43 b. Cutting of a bevel groove on the water side of the joint. The groove shall be 1/2 <br /> 44 to 3/4 inch in width and depth and shall be caulked with epoxy joint sealer in <br /> 45 accordance with manufacturer's instructions. <br /> 46 <br /> 47 D. Other Embedded Items: <br /> 48 <br /> 49 1. Prior to concreting, place all required sleeves, inserts, anchor bolts and embedded , <br /> 50 items. <br /> 51 <br /> sz , <br /> CONCRETE <br /> 042894 03100-12 , <br />