In the first stage of making cement, limestone and clay are crushed together to form a powder. While the process of making cement uses a number of tools, the production of concrete requires only a concrete mixer. Overall, limestone and clay pass through four stages before being bagged ready for use as cement which then accounts for 15% of the four materials used to produce concrete. The diagrams illustrate the way in which cement is made and how it is then used in the process of making concrete. Source: IELTS Cambridge English Test Book 8.The diagram below shows the stages and equipment used in the cement-making process, and how cement is used to produce concrete for building purposes. The diagram shown below is from IELTS Cambridge Book 8, Test 3. It is possible to have a diagram in your IELTS writing task 1 academic paper. This IELTS diagram model answer is estimated at band score 9.
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