A bag is 94 pounds of cement, or about 1 cubic foot; but if you order a 6-sack mix, all that tells you is how much portland cement is in the mix.Click to see full answer. Regarding this, what is the mixture for concrete?A concrete mixture ratio of 1 part cement, 3 parts sand, and 3 parts aggregate will produce a concrete mix of approximately 3000 psi. Mixing water with the cement, sand, and stone will form a paste that will bind the materials together until the mix hardens.One may also ask, how many 80lb bags of concrete make a yard? On average it will take 90x 40 lb bags, 60x 60 lb bags, or 45x 80 lb bags to fill one cubic yard of concrete. Subsequently, one may also ask, how much is a bag of cement? 15 cubic feet for every 20 pounds of mix, so a 40-pound bag yields . 30 cubic feet, 60 pounds of concrete mix yields . 45 cubic feet and an 80-pound bag yields . 60 cubic feet.Can I make my own cement?Cement, in fact, is one of several ingredients that are combined to make concrete. Cement is a powdery, dry substance that makes concrete when it’s mixed with water, gravel, and sand. Instead of buying a bagged mix, you can try making your own cement by obtaining and burning limestone.