The main function of molen concrete is to mix various construction materials, especially sand, gravel, cement and water, into a uniform concrete mixture. This concrete mixture is then used to make foundations, floors, columns, walls, sidewalks and various other construction structures. Molen concrete is available in various types and capacities. They can be portable molens that are easily moved to different construction sites or stationary molens that are placed at fixed construction sites. Some molens have a horizontal rotating drum, while others have a vertical drum.