Concrete produce: cement, water, sand and gravel are poured to a concrete mixer

The first diagram provides information regarding the process of producing cement while the second diagram illustrates the way to make concrete.

The material of cement is limestone and clay which passes 4 steps through 4 tools namely crusher, mixer, rotating heater, and grinder. The process is started from crushing limestone and clay to produce powder material. Then, that powder material is mixed using a particular mixer and brought to rotating heater in order to increase its temperature. The hot material is grinded to finally produce cement. The cement is packaged, eventually.

In order to produce concrete, cement, water, sand and gravel (a kind of small stones) are poured to a concrete mixer. A particular proportion of each material is needed in this case in order to result the good one. A half of the mix is gravel, a quarter of it is sand, cement itself is in 15 percent, and the rest of it is water.

Overall, in the step to produce concrete which is started from making cement, 5 materials and 5 tools are needed.

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Yes, you need to have the diagram uploaded and without it , we cannot really verify what you have written :(
Also, follow dumi's approach for this task. According to that, you need to have an OVERVIEW inserted before the body paras (detail paras). Further, this task really does not require a conclusion. Conclusion is an important feature for IELTS Task 2 which is an independent writing task. This one is more on to report writing and therefore your task here is to report what the diagram presents to the reader.

... as to how the satisfactory result could be delivered

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I'm so sorry for this, :)

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