Basic…everyday concrete used by homeowners and contractors alike. Very straight forward mixes that describe just what the mix is….”5 ½ sack Pea”…is 5 ½ sacks of cement per cubic yard of concrete with Pea gravel as the coarse aggregate. Sackage mixes range from 4 ½ sx to 6 ½ sx, all of which are intended to meet the Seattle IBC. These mixes are suitable for flatwork and meet the building code for specified strengths of 2000 psi to 4000 psi. Mixes with higher proportions of cement are pumpable if the proper equipment is used. Pump companies should always be consulted prior to a concrete placement to insure that the right equipment is available for the mix being used.