Pre-Krete is a pizza oven floor favorite. It gives an amazingly smooth, dark, waterproof, food-safe surface when cured. It is an aluminous hydraulic cement with many industrial purposes including lining the interior of potable water tanks and heaters. It is very resistant to chemicals, corrosion, and abrasion.
The maximum temperature rating after curing is 1000°F. This makes it a great product for the cooking area of Pizza ovens but often in the smaller back area upon which the hot wood coals will sit, I suggest a higher heat dense castable KS-4V which is rated to 2600°F.