Specifications include, but are not limited to: a. C 31 – Making and Curing Concrete Test Specimens in the Field. b. C 39 – Test for Compressive Strength of Cylindrical Concrete Specimens. c. C 138 – Test for Unit Weight, Yield and Air Content of Concrete. d. C 143 – Test for Slump of Hydraulic Cement Concrete. e. C 172 – Sampling Fresh Concrete. f. C 173 – Test for Air Content of Freshly Mixed Concrete by the Volumetric Method. g. C 192 – Making and Curing Concrete Test Specimens in the Laboratory. h. C 231- Test for Air Content of Freshly Mixed Concrete by the Pressure Method. i. D 1556 – Density of Soil In Place by the Sand-Cone Method. j. D 1557 – Moisture-Density Relations of Soils and Soils Aggregate Mixture Using 10 Pound Hammer and 18 Inch Drop. k. D 1586 – Penetration Test and Split Barrel Sampling of Soils. l. D 2166 – Unconfined Compressive Strength of Cohesive Soil. m. D 2922 – Density of Soil and Soil Aggregates by Nuclear Methods. n. D 2937 – Density of Soil in Place by Drive Cylinder Method.