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паров, кислот и т. д.), мелкие трещины растянутой зоны бетона
способствуют активному развитию коррозии арматуры. 5. Это приводит к
снижению несущей способности конструкций. 6. Для борьбы с коррозией
бетонных и железобетонных конструкций применяют плотные бетоны,
кислотостойкие бетоны, полимербетоны.
7. Complete the sentences:
1. Prefabrication means...
a) … reinforcement of brickwork with steel. b) … preassembly in a workshop,
so that the building can be more quickly erected on the site. c)... craft operation
at the building site.
2. Reinforced concrete is a building material in which...
a) ...such properties as small volume weight and high thermal conductivity are
combined. b) ...physical and mechanical properties at a normal temperature of
20°C make it semi-rigid and soft. c)...the joint functions of concrete and steel
are advantageously utilized.
3. Like any other stone material, concrete offers...
a) …the ability of binding together masonry units such as stone, brick and
plaster. b) … a good resistance to compressive loads. c) ...a lower volume
weight and it is manufactured from a mixture of unslaked lime and quartz sand.
8. Read this passage:
Concrete is made from cement, coarse aggregate (stones), fine aggregate
(sand or crushed stone) and water. Coarse aggregate ranging from 5 mm to 4
mm may be used for normal work. The maximum size of the aggregate should
not be greater than one quarter of the minimum thickness of the finished
concrete. The normal maximum sizes are 20 mm and 40 mm (20 mm being
more common. The maximum size of aggregate which should be used in small
concrete sections, or where reinforcement is close together, is 10 mm.
In concrete with widely spaced reinforcement, such as solid slabs, the size
of the coarse aggregate should not be greater than the minimum cover to the
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