MORTAR
Mortar is an intimate mixture obtained by adding water to dry mixture of sand and binding material
like clay, lime or cement
Classification of Mortar
1. On the basis of bulk density: Heavy weight, if weight is more than 15 kN/m', light weight, if its
weight is less than 15 kN/m'.
2. On the basis of application: Brick laying mortar, finishing mortar.
3. On the basis of binding materialMicd"mortat-binenmortar, surkhi mortar, cement mortar and
ga uged mortar.
The proportions of cement to sand for various works used are show in Table 1.2.
Table 1.2 Cement-sand proportions
Name of work
Cement: sand
VO.
Brickwork below ground level
General brickwork and stone masonry
For arch work
Damp-proof course
External plastering and ceilng plastering
Internal plastering
Pointing
:5 to I :4
1:5 to 1 :6
|:2 to 1:3
6.
The strength obtained with different proportion is as shown below:
(1) 1:3 Mix - 10 N/mm?; (2) 1:4 Mix - 7.5 N/mm; (3) 1 :5 Mix- 5.0 N/mm?; (4) 1:6 Mix -3.0
N/mm'; (5)1:8 Mix-0.7 N/mm'.
Cement mortar may be prepared by hand mixing or by machine mixing
Mortars with special properties are also used: Fire resistant, sand absorbing, X-ray shielding
packing mortar and decorative mortars are the special mortars.
