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� � <br /> N. ASTM C138 - Standard Test Method for Unit Weight, Yield, � <br /> and Air Content (Gravimetric) of Concrete . <br /> O. ASTM C143 - Standard Method of Test for Slump of Portland ', <br /> Cement Concrete . <br /> P. ASTM C150 - Standard Specifications for Portland Cement . , <br /> Q. ASTM C172 - Standard Method of Sampling Fresh Concrete . <br /> R. ASTM C173 - Standard Method of Test for Air Content of � <br /> Freshly Mixed Concrete by the Volumetric Method. <br /> S . ASTM C230 - Standard Specifications for Flow Table or Use , <br /> in Test of Hydraulic Cement . <br /> T. ASTM C260 - Standard Specifications for Air - Entraining � <br />, Admixtures for Concrete. <br /> U. ASTM C309 - Specifications for Liquid Membrane - Forming ' <br /> Compounds for Curing Concrete. <br /> V. ASTM C494 - Standard Specifications for Chemical � <br /> Admixtures for Concrete. <br /> W. ASTM C618 - Standard Specifications for Fly Ash and Raw or <br /> Calcined Natural Pozzolans for Use in Portland Cement . � <br /> 1 . 04 QUALITY ASSURANCE <br /> A. Coordinate and schedule in a timely manner with the � <br /> Owner' s Testing and Inspection Agency the following <br /> quality control items : � <br /> 1 . Examine concrete in tr <br /> uck to verify that concrete <br /> appears properly mixed. <br /> 2 . Perform a slump test for each concrete load. Record if � <br /> water or admixtures are added to the concrete at the <br /> job site . Perform additional slump tests after job site ' <br /> adjustments . <br /> 3 . Concrete - Mold four specimens per set for compressive � <br /> strength testing one set each 75 cubic yards placed. <br /> For each set molded record: <br /> a. Slump � <br /> b. Air content <br /> c . Unit weight i <br /> d. Temperature, ambient and concrete � <br /> November 25 , 1998 03300-2 98088 . 00 ' <br />