As Simple As 123| Concrete Construction Magazine ...
As Simple As 123. At 30 minutes old, a yard of 4inch slump 123 concrete will typically contain about 6½ sacks of cement, 1850 pounds of stone, 1220 pounds of sand, and 300 pounds (36 gallons) of water. At 28 days, its w/c will deliver a compressive strength of 4500 psi. Although a little fine and somewhat gapgraded,...