Quikrete, 60 LB, Crack Resistant Concrete Is A 4000 PSI Construction Grade Blend Of Portland Cement, Air-Entraining Admixture & Special Alkali-Resistant Reinforcing Fibers, Significantly Reduces Cracking From Drying Shrinkage, Superior Workability & Has Improved Freeze Thaw Durability, Use For: Driveways, Walkways, Sidewalks & Patios.