The diagrams illustrate the cement making process and the type of equipment and materials used to produce the cement and the way of using cement to produce concrete. Overall, the steps of making cement are more complicated and require advanced machinery while concrete production needs right proportion in simpler machine.
Starting with the first diagram, cement is produced by combine raw materials such as limestone, clay, and processed on an instrument called a crusher. Then, they are all mixed together and entered into a rotating heater. As in the heating tube rotates, heat is introduced from the end of tube before the mixture is really down to the grinder. Futhermore, after all the systematic process finished, the mixture turned into some cement which is then packed into bags.
Meanwhile, for the second diagram, the production of concrete needs four main elements with 15 percent cement, 10 percent water, proportion of sand and gravel by 25% and 50% respectively. These materials are mixed together in a large concrete mixer which aims to produce concrete used in buildings.