The task
The diagrams below show the stages and equipment used in the cement-making process, and how cement is used to produce concrete for building purposes. Summarise the information by selecting and reporting the main features, and make comparisons where relevant.
| Step | Description |
|---|---|
| 1 | Limestone and clay are crushed into powder by a crusher |
| 2 | The powder is blended in a mixer and then passed through a rotating heater |
| 3 | Heat is applied from below while the cylinder rotates to ensure even treatment |
| 4 | The heated material is ground in a grinder to produce finished cement |
| 5 | Cement is packed into bags for transport and sale |
| 6 | For concrete, cement is combined with 25 percent sand, 50 percent gravel and 10 percent water |
| 7 | The four materials are rotated in a concrete mixer until a uniform mix is formed |