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Colorado Legacy Land Former Schwartzwalder Mine <br /> North Waste Rock Pile Diversion Channel <br /> 2.02 Concrete Mix Proportions <br /> A. 3,000 psi <br /> 1. Minimum Compressive Strength: 3,000 psi at 28 days. <br /> 2. Water/Cement Ratio: 0.45. <br /> 3. Air Content: 2% -4%. <br /> 2.03 Concrete Reinforcement <br /> A. Reinforcement Bars: Conform to ASTM A615, Grade 60 for all bars No. 4 or larger. <br /> B. No. 3 Bars: Conform to ASTM A615, Grade 40. <br /> C. Welded Wire Fabric: Conform to ASTM A185,using bright basic wire conforming to <br /> ASTM A82. Wire gage No. 11 or smaller shall be galvanized. Provide mats only. <br /> D. Bolsters, Chairs,and Accessories: Conform to ACI SP-66 and CRSI Manual of Standard <br /> Practice. <br /> 2.04 Curing Agent <br /> A. Apply to all concrete surfaces unless otherwise indicated or specified. <br /> B. Curing agent shall conform as follows: <br /> 1. ASTM C309,Type 1: Use where concrete surface is not exposed to direct <br /> sunlight after placement. <br /> 2. ASTM C309,Type 1-13: Use where slabs are exposed to direct sunlight for a <br /> period of seven days minimum after placement. Curing and sealing agent with <br /> fugitive dye shall be readily distinguishable upon the concrete surface for at least <br /> four hours after application but shall be inconspicuous within seven days after <br /> application. <br /> 3. ASTM C309,Type 2: Use as specified in PART 3,ARTICLE 3.03 —PLACING <br /> OF CONCRETE,this Section. <br /> 4. Curing compound shall be VOC compliant with a maximum VOC content of 2.9 <br /> lbs/gal, or less where Project location regulations are more stringent. <br /> PART 3 - EXECUTION <br /> 3.01 Field Testing <br /> A. Field Testing of Concrete and Making of Concrete Test Cylinders: <br /> 1. Contractor shall furnish test equipment,test cylinder molds,and certified <br /> personnel to perform all required field tests,make the required concrete test <br /> Section 033053—Miscellaneous Case-in-Place Concrete Page 4 <br />