How much navvy jack is required to make 1 cubic yard of concrete?

To make 1 cubic yard of concrete, you typically need about 1.5 to 2 sacks (94-pound bags) of Portland cement, which is a key ingredient. The amount of navvy jack, or gravel, required can vary based on the desired mix ratio, but generally, you would need around 1.5 cubic yards of gravel. The standard concrete mix ratio is usually 1 part cement, 2 parts sand, and 3 parts gravel. Therefore, the specific quantity of navvy jack will depend on the total volume of aggregates used in the mix.