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' DIVISION 03 Section 3450 - Architect�ural Precast Concrebe-Plant Cast <br /> ' E. Patching:Where core test results are satisfactory and azchitectural precast concrete units <br /> meet requirements solidly fill core holes with patching mortar and finish to match adjacent <br /> concrete surfaces. <br /> ' F. Defective Work:Discard architectural precast concrete units that do not conform to <br /> requirements,including strength,manufacfiuring tolerances,and finishes.Replace with <br /> ' architectural precast concrete units that meet requirements. <br /> PART 3. EXECUTION <br /> ' 3.01 EXAMINATION <br /> ' A. Examine substrates and conditions for compliance with requirements for installation <br /> tolerances,true and level bearing surfaces,and other conditions affecting performance of <br /> azchitectural precast concrete units.Do not proceed with installation until unsatisfactory <br /> conditions have been corrected. <br /> , B. Do not install azchitectural precast units until supporting concrete has attained minimum <br /> allowable design compressive strength. <br /> ' 3.02 INSTALLATION <br /> A. Install clips,hangers,and other accessories required for connecting architectural precast <br /> , concrete units to supporting members and back-up materials. <br /> B. Install azchitectural precast concrete units plumb,level,and in aligmment. I'rovide <br /> ' temporazy supports and bracing as required to maintain position,stability,and alignment <br /> as uruts aze being permanently connected. <br /> 1. Maintain horizontal and vertical joint alignment and uniform joint width as <br /> ' erection progresses. <br /> 2. Remove projecting hoisting devices and cement-grout fill recessed hoisting <br /> devices. <br /> � C. Anchor architectural precast concrete units in position by bolting,welding,grouting,or as <br /> otherwise indicated.Remove temporary shims,wedges, and spacers as soon as possible <br /> ' after anchoring and grouting are completed. <br /> D. Welding:Perform welding in compliance with AWS D1.1 and AWS D1.4,with qualified <br /> welders. <br /> ' 1. Protect azchitectural precast concrete units and bearing pads from damage by field <br /> welding or cutting operations and provide noncombustible shields as required. <br /> 2. Repair damaged steel surfaces by cleaning and applying a coat of galvanizing repair <br /> ' paint to galvanized surfaces. <br /> 3. Repair damaged steel surfaces by cleaning and repairing damaged painted surfaces. <br /> � E. At bolted connections use lock washers or other acceptable means to prevent loosening of <br /> nuts. <br /> F. Grouting Connections:Grout connections where required or indicated. Retain grout in <br /> ' place until hard enough to support itself. Pack spaces with stiff grout material,tamping <br /> until voids aze completely filled. Place grout to finish smooth,plumb,and level with <br /> adjacent concrete surfaces.Keep grouted joints damp for not less than 24 hours after initial <br /> , set. Promptly remove grout material from exposed surfaces before it hardens. <br /> 03450- 9 <br /> HENNEPIN COUNTY Orono Salt StoraQe <br /> ' March 22,2002 Project No.:0031569 Contract No.:0751R2 <br />