Introduction
This material is made for a student to understand how cement is made, what is it's ingredients. There is video that student needs to watch and then answer the following questions.
Darbs ir izveidots par tēmu "Cementa izgatavošana". Darbā ir ietverts video materiāls par šo tēmu, lai skolēnam būtu iespēja labāk saprast no kā tiek veidots cements un kādas ir tā sastāvdaļas, kā arī ir iekļauti 14 jautājumi uz kuriem ir jāatbild pēc video noskatīšanās.
Task
Student has to watch the following video and then answer 14 questions based on this video. The answers should be full sentences.
Process
First, watch the video material and then answer the questions below. Please, write full answers, if possible.
1. What is the difference between cement and concrete?
2. What are the three ingredients that limestone has close to it's surface?
3. What do workers plant into drilled holes in the stone and why?
4. At the plant, where do trucks dump the rocks in?
5. Why the water is constantly spraying when the rocks are being crushed?
6. Does the ratio varies in making different cements?
7. What the machine called tripper does?
8. What is raw meal?
9. What is the temperature at with the powder goes into the preheater?
10. Why the temperature in the preheater goes up very quickly?
11. What is the rotary kiln?
12. At what heat the clinker is made?
13. Why is it important to cool the clinker quickly?
14. Why cement mills are called the ball mills and what do they do?
Evaluation
You can get maximum 14 points. For every full answer you can get a point.
1. The difference is that cement is a fine powder used to make concrete.
2. Silica, iron, aluminum oxide.
3. They plant explosives.
4. They dump them in primary crusher.
5. So that the dust that comes from the crushing doesn't blow away and set somewhere.
6. Yes.
7. It makes the piles of required proportions.
8. It is a dry rock powder that has minerals mixed with the rocks.
9. It is 80 degrees Celsius.
10. It is so the minerals could bond together and they would harder when they are mixed with water.
11. It is a huge cylindrical furnace.
12. It is made at about 1500 degrees Celsius.
13. Because then it makes better quality cement.
14. Because they have metal balls in them so they crush the clinker into a fine powder.
Conclusion
You have finished the task.
12-14 points You have understood the theme and answered the questions very well.
8-11 points You have understood the theme and answered the questions.
5-7 points Your points are too less, you should watch the video again.
0-4 points You should definitely watch the video again and also answer the questions for the second time.