19. What material is spoken about? What else can you say about it?

19. What material is spoken about? What else can you say about it?

1) It is a mixture of cement, sand, gravel and water. That is...

2) It is the combination of two of the strongest structural materials,
concrete and steel. That is...

3) The most important quality of this material is its property to be formed
into large and strong monolithic units of any desired shape. That is...

4) These concretes are composed of heavy aggregates. They are...

5) These concretes are composed of light aggregates. They are...

6) These concretes contain a large number of small voids. They are...

7) These concretes are made by using materials which foam or form gas
_ during the mixing of the concrete. These are...

8) This concrete is made on a construction site and poured into position as
a wet mix. It is...

9) This concrete is used as the material for making prefabricated units in a
factory. It is...

10) In this concrete cement is replaced by a mixture of granulated blast
furnace slags and sodium and potassium compounds. It is...

11) This concrete is light, fire-resistant and acid-proof. It is...

12) This concrete is made by using materials which foam during the
mixing of the concrete. It is...

13) This concrete is made by using materials which form gas during the
mixing of the concrete. It is...

14) This concrete is not subject to cracking. It is...

15) This concrete is used for irrigation systems, roads, pavements, etc. It
is...

20. Speak on concrete, its components, properties, use.

21. Speak on concrete classifications.

22. Read the dialogues in pairs and then speak about the information presented in them.

Dialogues 1

- May concrete be considered an artificial conglomerate stone?

- Certainly, it may! Why not?

- You know how it's made, don't you?

- Sure, I do. It's made by uniting cement and water into a paste.