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protection. � <br /> � <br /> CONCRETE - SITE CAST � <br /> A. Design Code: ACI 318, ACI "Manual of Standard <br /> � <br /> Practice...", latest adoption. � <br /> B. Materiats ,� <br /> l. Minimum concrete strength at 28 days(fc)for � <br /> slabs-on-grade and walls to be 4000 psi. For footin�s, � <br /> 3000 psi. � <br /> 2. Concrete supplier to submit concrete mix designs to � <br /> Architect for all site cast concrete. <br /> 3. Furnish 5-7% air entraining agent for all concrete <br /> exposed to freezing temperatures. <br /> 4. Reinforcing steel <br /> a. Welded wire fabric- ASTM A185. <br /> b. Deformed bars- ASTM A615, Grade 60. <br /> 5. Install slab on grade control joints in accordance with <br /> PCA publication "Concrete Floors on Ground". <br /> C. Installation notes: <br /> 1. Support reinforcement only with CRSI recommended bar <br /> supports(wood, brick, etc. not acceptable) or hang from <br /> top of forms. Use supports with sand plates or horizontal <br /> runners for slab-on-grade reinforcement. <br /> 2. Concrete cover per ACI 318, latest adoption. <br /> 3. Sawcut slabs-on-grade as soon as concrete may be worked <br /> without unraveling(max. 6 hours after placement). <br /> 4. Place and securely tie footing dowels in position prior <br /> to concrete placement (i.e.: do not embed dowels into <br /> wet concrete). <br /> CONCRETE- PRECAST PRESTRESSED <br /> A. Design Code: ACI 318, latest adoption. <br /> B. Concrete strength at 28 days(fc): 5000 psi minimum. <br /> C. Supplier notes: <br /> 1. Precast, prestressed concrete shall be designed, <br /> fabricated, and erected according to the specifications <br /> of the ACI Code and the Prestress�Concrete Institute <br /> Design Handbook, latest edition. <br /> 2. Precast plank shall be designed to withstand the <br /> superimposed loads as indicated on plan. <br /> 3. Field welding of cast-in plates, etc., to be performed <br /> only by certified welders m accordance with AWS D1.1, <br /> latest edition. <br /> 4. Precast material to be manufactured in accordance with <br /> the PCI Quality Control Manual, latest edition. <br /> 5. Submit shop drawings and certified design calculations. <br /> 6. Provide hangers in plank at.openings as required. Do not <br /> overcut plank transverse to span direction. <br />