Chain command blocks in Minecraft are one of three different command block types that can be utilized in-game.

In Minecraft, you can create concrete with some concrete powder and water. However, you need to manually place the powder near a water block in order to convert it into solid concrete.

Two ways to make concrete in Minecraft #1 Craft Concrete Powder There is no Concrete Powder block in Minecraft because you can only craft this with one piece of any dye.