Task 8 прочитайте и переведите текст на 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?