Reinforced Cement Pipes as Hume Pipes or spun pipes
The spun concrete pipe is made by a process in which centrifugal force is used to spread a wet concrete mixture over the inner surface of a horizontal mould. Concrete is fed into the slowly revolving mould which is spun, squeezing out surplus water and evenly spreading compacted concrete over the inner surface. The pipes are extremely dense. They have the ability to withstand great pressure and are non-porus.