Quikrete 600 PSI is used in construction and repair of concrete where extra strength is required. This product can be used for patios, deck support, curbs, patching existing concrete and driveways. It is a high strength concrete (6000 psi) (41 MPa) in 28 days and features a fast strength gain (1day = 2000 psi). It can be walked on in 8 hours and allows other construction in 24 hours. It withstands higher impact and wears longer than regular concrete and also has less shrinkage.