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4. Note: At Contractor's option,approved bonding compound may be used in lieu of bonding grout. Install in accordance with manufacturer's instructions. U. Bond concrete toppings placed over concrete slabs to base slabs using bonding compound. Install in accordance with manufacturer's instructions. 3.2 CONSTRUCTION,CONTRACTION AND EXPANSION JOINTS A. Provide construction joints when stoppage of concreting operations occurs. B. Continue reinforcing steel across construction joints unless noted or detailed otherwise. C. Unless detailed otherwise,locate horizontal construction joints in walls and columns at underside of floor slabs and beams. D. Unless detailed otherwise,locate construction joints in supported floors of reinforced concrete structures at center span of slabs,beams or girders with provisions for transfer of shear and bending forces through joints.Provide joints perpendicular to main reinforcement with keys and dowels as detailed. E. Provide very lightly rounded edges at construction,control and expansion joints where slab joint will be exposed. F. Provide joints in concrete slabs-on-grade where shown and constructed as detailed. Where contraction joint spacings are not specifically shown they shall be spaced approximately 15 feet on centers at interior locations where joints will be exposed or under non-resilient floor covering. At interior locations below resilient finish or carpet spacings may be increased to approximately 30 feet. Interior panels shall be near-square with short: long side ratio not less than 2:3. At exterior locations spacings of contraction joints shall not exceed 10 feet on centers and short-long side ratio shall not be less than 3:4. Contraction joints shall be made to depth of 1/4 slab thickness by saw-cuts,joint formers or other method acceptable to Architect. G. Provide cleanly cut,straight joints in toppings over joints in base slab. Provide tooled, lightly rounded edges where exposed. H. Provide vertical construction, contraction and expansion joints in walls as detailed. Pour sections alternately with minimum waiting period of 48 hours between adjacent pours. Unless noted otherwise,locate joints midway between columns. Do not locate joints within 5 feet of corner,wall intersection or column. Unless noted otherwise locate vertical contraction joints in walls at 30 feet maximum spacings. I. Install waterstops in concrete joints where noted. ADDENDUM#1 1607.001 -ORONO ICE ARENA(CP-2) Page 03300-8