QUIKRETE® Q-Max Pro Concrete Mix (No. 1004-81) is a fiber reinforced, rapid hardening concrete formulated to provide a 1-hour working time, a walk-on time of 3 hours and achieve a compressive strength of 6500 PSI (44.8MPa). The mix provides superior workability and finishing characteristics and resists drying shrinkage cracks. QUIKRETE® Q-Max Pro Concrete Mix is air entrained for improved freeze-thaw durability and contains a corrosion inhibitor to protect reinforced steel from the effects of chloride and de-icing materials.