Why do the bulk cement trailers or the silo trailers use a peculiar shape?
The secret to the shape is inside the drum. There are spiral fins welded to the inside of the drum. When you turn the drum one direction, the dry cement ingredients the water are pulled down into the drum by the direction of the fins, mixing everything together. When you arrive at the job site, the ingredients are all mixed into cement, and ready to use. The driver then reverses the rotation of the drum, and the mixed cement now is pushed out of the drum by those same fins, he pours the load, and goes back to the yard. The ingredients are loaded into the drum dry, then water is added. The drum then mixes it all as the truck is driving to the job site.
Because the gravity is what makes the cement flow from the upper portion to the ground area
