Building materials

stics are comparatively new building materials, but they have already found many uses in modern construction. Plastics combine all the best characteristics of building materials with good insulating properties. Plastics are produced from chemicals. Glass-reinforcement plastics are produced from polyester resins reinforced with glass fibres. Plastics and glass-reinforced plastics are the materials to be used in modern construction on a large scale.
T: Answer the questions presented on the screens of your computers.
1. What are the most commonly used building materials?
2. Into which groups is timber divided?
3. For what purposes are they (softwoods and hardwoods) used?
4. What does concrete consist of?
5. What fine and coarse aggregates do you know?
6. What components does reinforced concrete include?
7. Explain the process of making bricks.
8. Why have plastics already found use in modern construction?

I. T: Now lets go to the warehouse shop. Lets dramatize the following dialogues.
a) Shop assistant: What can I do for you, sir/madam?
Customer: Id like to buy three bags of cement, but I hesitate about the producer.
oo Take the cement of Sterlitamak.
oo How much is it?
oo It costs 600 rubles.
oo It isnt very expensive. I will take it.
oo How will you pay?
oo Cash. It costs 600 rubles, doesnt it?
oo Yes, it does. Here you are.

b) - Good morning.
oo Good morning, sir/madam. Can I help you?
oo I want to buy single glass packs.
oo Do you have anything special in mind?
oo Yes, I need cheap single glass packs.
oo You can buy glass packs of Chelyabinsk. They are right for you.
oo How much is it?
oo Three thousand rubles. It