What is the required gravel size to be mixed with cement for a 6 inches thickness floor of driveway?

For a 6-inch thick driveway, the recommended gravel size to mix with cement is typically around 3/4 inch to 1 inch. This size provides a good balance of structural support and compaction, allowing for proper drainage and a stable base. It's essential to ensure the gravel is clean and free of debris to achieve optimal bonding with the cement.