Part 4 Text. Перевесите текст с английского языка на русский.
The properties of building materials.
Materials that are used for structural purposes should meet several requirements. In most cases it is important that they to be hard, durable, fire-resistant and easily fastened together.
The most commonly used materials are steel, concrete, stone, wood and brick. They differ in hardness, durability and fire-resisftancc.
Wood is the most Ancient structural material. It is light, cheap and easy to work.. Eiut wood has certain disadvantages: it burns and decays.
Stone belongs to one of the oldest materials used by man. It is characteristic of many properties. They are mechanical strength, compactness, porosity, sound and heat insulation and fire-resistance
Bricks were known many thousands of years ago. They are the examples of artificial building materials
Concrete is referred to as one of the most important building materials. Concrete is a mixture of cement, sand, crushed stone and water.
Steel has come into general use with the development of industry, its manufacture requires special equipment and skilled labor.
Plastics combine all the fine characteristics of a building material with good insulating properties. It is no wonder mat the architects and engineers have turned to them to odd beauty to modem homes and offices.
All building materials are divided into three main groups:
1) Main building materials such as rock and artificial stones, timber and metals.
2) Building materials such as lime, gypsum and cement.
3) Secondary of auxiliary- materials which are used for the interior parts of the buildings.
We use many buildings materials for bearing structures. Binding materials are used for making artificial stone and for joining different planes. For the'interior finish of the building we use secondary materials.. Скачать
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