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B. Prepared Subgrade: If subgrade conditions are unsatisfactory,have corrections made by General Contractor before proceeding. Do not begin paving work until subgrade conditions are acceptable,including specified compaction,as verified per compaction tests, Spec. Section 02200,Earthwork. C. Crushed Aggregate Base: Place and compact crushed aggregate base beneath curb and gutter and concrete drives per MnDOT Spec. Section 2211. Coordinate placement of aggregate base with bituminous pavement contractor. 3.2 PLACING CONCRETE A. General: Place concrete in accordance with ACI 301,Chapter 8. Consolidate concrete in accordance with ACI 309 using high frequency vibrators. Unless noted or detailed otherwise, sidewalk slabs shall be 4"thick. B. Forms: Set forms to required grades and lines,rigidly braced and secured. Install sufficient quantity of forms to allow continuous progress of work,so that forms can remain in place at least 24 hours after concrete is placed. Set with allowable tolerance of 1/8 inch when checked with a straightedge. Forms shall not deviate from true line by more than 1/4 inch at any point. Clean and oil forms at each use. Where curvilinear curbs are shown, form work shall be placed/constructed to"true arc"layout. Short tangent segments will not be accepted. C. Reinforcing: Locate,place and support reinforcement as indicated or with a minimum of 1-1/2" concrete cover. Do not extend reinforcing through expansion and contraction joints. Provide dowelled joints through expansion and contraction joints with one end of dowels fitted with capping sleeve to allow free movement. Keep reinforcing free of dirt, oil,rust, scale or other substances. Install welded wire fabric in as long lengths as practicable and offset end laps in adjacent sheets a minimum of two cross wire spacings. Make all end and side lap splices so the overlaps between outermost cross wires of each sheet are not less than 2". D. Sidewalk Joints: Unless noted or detailed otherwise,provide for expansion joints in sidewalks at intervals not to exceed 40 feet on centers and where walks abut curbs, stoops, walls or other fixed objects.Expansion joints shall be 1/2" wide using filler materials specified in Article 22. Provide tooled weak plane joints across sidewalks, 1-1/2" deep x 3/8" at 5'-0" intervals,unless otherwise noted. Tool edges of joints to a 1/4" radius. E. Curbs And Gutters: Provide control joints in poured in place concrete curbs, 10'-0" o.c. maximum spacing with expansion joints not over 40'-0"o.c. Make control joints by cutting approximately 1/8" wide x 1"to 1-1/2"deep into exposed surfaces. Expansion joints shall be 1/2" wide with joint filler. At curbs adjacent to sidewalks,align joints in curb and sidewalks. F. Sealants: Install sealant in accordance with Section 07900-Joint Sealers. ADDENDUM#1 1607.001 -ORONO ICE ARENA(CP-2) Page 02515 - 5