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2. Answer the following questions.

1. Of what elements does concrete consist and what is each element needed for?

2. If we want to make the concrete stronger, should we use little or much water in mixing it?

3. What is done to make the concrete resistant to bending?

4. What do we achieve by prestressing the concrete?

5. In what way is prestressed concrete produced?

6. In what case is post-tensioning used and how is it done?

7. What made it possible to erect the buildings quickly?