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4.6 CURING AIDS <br /> When specified by the Drawings and/or specifications, or required by the <br /> Engineer, materials or procedures for curing shall conform to one of the <br /> following: Liquid Pigmented curing compounds--ASTM C 309; Water-proof <br /> paper--ASTM C 171. Other materials or procedures may be used with prior <br /> authorization by the Engineer. <br /> 4.7 HANDLING AND STORAGE OF MATERIALS <br /> 4.7.1 REINFORCEMENT <br /> Reinforcing steel shall be handled and stored in such manner as to <br /> avoid distortion, excessive rusting, and objectionable coatings of <br /> paint, oil, grease, dried mud, dried mortar or other materials. Bars <br /> shall be stored so that each may be identified after bundles are <br /> broken. <br /> 4.7.2 AGGREGATE <br /> Aggregate shall be handled and stored in such manner as to <br /> prevent segregation of sizes and to avoid the inclusion of dirt <br /> and/or foreign materials in the concrete. Stockpiles shall be built <br /> up in layers of uniform thickness and not in cone-shaped piles. <br /> Material shall be removed from stockpiles in approximately <br /> horizontal layers. While placing fine aggregate in storage piles, <br /> care shall be exercised to prevent fines from being blown away. <br /> Fine aggregate shall remain stockpiled at least 24 hours allowing <br /> excess moisture to drain from freshly washed aggregates. <br /> 4.7.3 CEMENT <br /> Cement in sacks or barrels shall be stored under a weather-tight <br /> cover with the floor raised at least 0.5 foot above the ground. <br /> Cement that has hardened or partially set shall be removed from <br /> the site and not used. Bulk cement shall be stored in airtight and <br /> weatherproof bins with access for inspection. <br /> SPEC.B- CONCRETE <br /> PAGE 7 <br />