Laserfiche WebLink
DIVISION 03 Section 03300- Cast-In-Place Concrete ' <br /> 2. Design mixes to provide norn�al weight concrete with the following properties: � <br /> a. Compressive strength as specified on drawings; water-cement ratio, 0.51 <br /> maximum(non-air-entrained),0.40 maximum(air-entrained). <br /> 3. Limit maximum wafier-cement ratio of concrete exposed fio freezing and thawing to � <br /> 0.45.Limit maximum wafier-cement ratio of concrete exposed to de-icing salts to.9.40. <br /> 4. Slump Lunits:Proportion arid design mixes to result in concrete slump at point of � <br /> placement as follows: <br /> a. Reinforced Foundation Systems:Not less than 1 inch and not more than 3 inches. � <br /> b. Other Concrefie:Not more than 4 inches, <br /> 5. Adjust mix designs when material chazacteristics,job conditions,weather,test results,or ` <br /> other circumstances warrant.Do not use revised concrebe mixes until laboratory test data <br /> and strength results have been submitted bo and reviewed by the Architect. <br /> 6. Use air-entraining admixture in exterior exposed concrete,providing,not less than 4.5 � <br /> percent nor more than 7 percent entrained air for concrete exposed to fireezing and <br /> thawing,and from 2 percent 104 percent for other concrete. � <br /> 7. Use wafier-reducing,accelerating,and retarding admi�ctures that have been tested and <br /> accepted in mix designs in strict rnmpliance with manufacturers directions. ' <br /> 8. Ready-Mix Concrete:ASTM C 94. <br /> 2.03 REINFORQNG MATERIALS , <br /> A. Reinforcing Bars:ASTM A 615,Grade 60(ASTM A 615M,Grade 400),deformed. <br /> B. Galvanized Reinforcing Bars:ASTM A 767(ASTM A 767M),Class II,2 oz./sq. ft. (610 , <br /> g/sq.m)zinc,hot-dip galvanized. <br /> C. In lieu of the above,epoxy-coated bars may be used,at Contractors option. , <br /> D. Steel-Welded Wire Fabric:ASTM A 185,plain,cold drawn. <br /> PART 3. EXECUTION � <br /> 3.01 FORMS , <br /> A. Formwork:Construct formwork so that concrete members and structures are of correct size, <br /> shape,alignment,elevation,and position.Select form materials to obtain required finishes. � <br /> 1. Maintain formwork tolerances and surface irregularities within ACI 3471imits,Class A <br /> tolerances for concrete exposed to view and Class C tolerances for other concrete <br /> surfaces. , <br /> 2. Provide openings in formwork to accommodate work of other trades.Accurately place <br /> and securely support items built into forms. , <br /> 3. Clean and adjust forms prior to concrete placement.Apply form release agents or wet <br /> forms as required.Retighten forms during concrete placement,if required to eliminate <br /> mortar leaks. � <br /> page 03300- 3 <br /> HENNEPIN COUNTY Orono Salt Stora�g ' <br /> March 22,2002 Project No.:0031569 Contract No.:0751R2 <br />