Various materials are used to construct a building. Various things such as stone, gravel, crushed stone, sand, and slang are often used for the construction process. However, some heavy duty machines are used to make them into usable aggregate. After crushing into small pieces, they can be used for roads, buildings, railroad beds, or other construction purposes.
It is not uncommon for a concrete plant to slow and loose production over time but in most cases this slowing is caused by a mechanical failure somewhere on the plant, settings on an automatic not being optimized for plant performance, or a combination of the a control system being programmed to slow one or more parts of the plant in an attempt to solve one or more other problems with the concrete plant.