QUIKRETE® FastSet™ Concrete Mix (No. 1004) is a special blend of cement with specifically graded fine & coarse aggregates. Sets in 20-30 minutes allowing time for mixing, pouring and finishing. Use at any thickness from 1 1/2″ (3.8 cm) to 24″ (61 cm). Exceeds the requirements of ASTM C 928 R-3.