TASK 8 Прочитайте и переведите текст на российский язык The functions of

TASK 8 Прочитайте и переведите текст на российский язык



The functions of mortar

Mortar is the matrix used in
the beds and side joints of brick-work and for plastering walls and floors. Its
functions are
as follows:

1 to distribute the pressure
throughout the brickwork,

2 to adhere and bind together
the bricks,

3. to act as a non-conductor
and prevent the transmission of heat, sound and moisture from one side of wall
to the other. The factors governing the choice of mortars for various purposes are:

1) strength as being a main
factor determining the strength of the wall;

2) porosity and capillary
characteristics as affecting the

rain-excluding
properties and durability of the wall;

3) content of soluble salts
which determines the possibility to destruction of the masonry or brickwork.

Mortar consists of an inert
aggregate bound by a cementing material. The cementing material is most important in
determining the characteristics of the mortar. The usual cementing materials
used for constructional work are hydraulic limes or Portland cement.

Clean, sharp pit sand is the
best aggregate. Old bricks, burnt ballast or stone a ground in a mortar
mill may be used as substitutes for sand.

Mortar may be classified as follows:

1
Cement mortars

2
Cement-lime mortars

3
Lime-mortars.




Ответьте письменно на вопросы:


1
What do we call mortar?


2
Can you name the factors governing
the choice of a mortar?


3
What does mortar consist of?


4
What type of aggregate is the most
suitable for being used in mortars?


5
How can be mortars classified?
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