Making and curing concrete test specimens
Concrete is sampled in accordance with ASTM C172. Concrete is placed into curing molds in three equal lifts, each lift is rodded 25 times. Each mold is covered to protect against moisture loss, and carefully placed in a protected area.
1 but typically several specimens per set of cylinders
Typically 4" x 8" or 6" x 12" cylinders
compressive strength, concrete, cylinders