Mixing concrete powder into the gravel - driveway ...
This means how many (usually 80 lb.) sacks of Portland Cement do you want mixed into each cubic yard of the concrete. Typical mixes, depending on application, will be 4 sack, 4.5 sack, 5 sack, 5.5 sack, or 6 sack mixtures. In addition to the normal aggregates, for an extra cost you may add flyash or volcanic pumice to increase density and ...