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Text 1. Ceramic tiles

It is a well-known fact that there exist many types of bricks. Some of I hem are highly usable in construction while others are not popular be­cause of their poor properties. Between these types there lie various types that are used for specific purposes. To them belong, for example, ceramic tiles.

Ceramic tiles is a burned-clay product. It is mainly used for decora­tive and sanitary purposes.

A ceramic tile consists of a clay body (корпус) covered with decora­tive glaze. Ceramic tiles are usually flat in form. They are extremely vari­ous. They vary in size from about 1/2 in square to more than 6 in. Their shapes are widely variable: squares, rectangles, hexagones, and others. Ceramic tiles are produced from clays of different colours. But — strange as it is — their colours do not depend on the colours of clays they are made of. Tiles are glazed, as a rule, and their colour depends on the colour of the glaze they are covered with. It is quite natural that ceramic tiles in practice exist in wide variety of colours: from pure whites to deep darks and blacks. Ceramic tiles are applied to the covered surface by means of a mortar or some adhesive substance. They are usually applied with the thinnest mor­tar joint.

1. Pair work. Put these questions to your groupmate. Let him/her answer them.

  1. Is the body of a ceramic tile covered with some substance? What sub­stance is it covered with?

  1. What spheres are ceramic tiles used in?

  2. Do they differ in forms, colours, and shapes?

  3. What are their colours and sizes?

  1. By what means are ceramic tiles applied to the surfaces? Are they applied with a thick or thin adhesive joint?

Read and translate the article.

Text 2. Terracotta

Terracotta belongs to decorative types of brick. They are produced of burned clay. Their structural properties being similar to the properties of brick, they are often used in a manner similar to brick. Terracotta also exists in a wide variety of colours from pure whites to blacks. Their colour depends on the colour of the glaze they are covered with. Different adhe­sive substances are used for the application of terracotta to the surfaces being decorated with them.

Read and translate the text.

Text3. Wood

Wood has been a highly used building material since prehistoric times. Among other highly used construction materials there are concrete, steel, brick, stone, and plastics. They all differ in their properties and in the methods of usage. Construction materials are known to differ in strength, hardness, fire- and corrosion-resistance durability, and, naturally, cost.

Being the oldest building material, wood is also known to be the only naturally growing organic material. Is wood strong? Hardly so, because wood always contains some water which decreases its strength. But after the wood is cut, the water content starts to evaporate and as the water content decreases the strength of the cut wood and its hardness start to increase. It is a well-known fact that the drier is the cut wood the greater is its strength and hardness.

Trees are known to grow naturally, which makes wood a constantly renewable natural resource. Among other advantages of wood there are its low cost, low weight, and high workability. But, as any other construction material, wood has its disadvantages. The main ones are the following — it is not fire-resistant, it easily burns. Besides, it easily decays.

Read and translate the text. Answer the questions after the text.